stm32f0: Remove hal based stm32f0 implementation

Signed-off-by: Eug Krashtan <eug.krashtan@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

17 files changed, 0 insertions, 1824 deletions

diff --git a/src/stm32f0/Kconfig b/src/stm32f0/Kconfig
deleted file mode 100644
index 6914acfa..00000000
--- a/src/stm32f0/Kconfig
+++ /dev/null
@@ -1,44 +0,0 @@
-# Kconfig settings for STM32F0 processors
-
-if MACH_STM32F0_HAL
-
-config STM32F0_HAL_SELECT
-    bool
-    default y
-    select HAVE_GPIO
-    select HAVE_GPIO_ADC
-    select HAVE_GPIO_I2C
-    select HAVE_GPIO_SPI
-    select HAVE_GPIO_BITBANGING
-
-config BOARD_DIRECTORY
-    string
-    default "stm32f0"
-
-config CLOCK_FREQ
-    int
-    default 48000000
-
-config CANSERIAL
-    bool "Use CAN bus for communication (instead of serial)"
-    default y
-config SERIAL
-    depends on !CANSERIAL
-    bool
-    default y
-
-config SERIAL_BAUD
-    int "CAN bus speed" if LOW_LEVEL_OPTIONS && CANSERIAL
-    default 500000 if CANSERIAL
-
-config DEBUG_OUT
-    bool "Use debug output to UART TX pin"
-    depends on CANSERIAL
-    default y
-
-config USE_LOG
-    string
-    default "USE_LOG" if DEBUG_OUT
-    default "NO_LOG" if !DEBUG_OUT
-
-endif
diff --git a/src/stm32f0/Makefile b/src/stm32f0/Makefile
deleted file mode 100644
index 1b473245..00000000
--- a/src/stm32f0/Makefile
+++ /dev/null
@@ -1,70 +0,0 @@
-# Additional STM32F0 build rules
-
-STLINK=st-flash
-
-# Setup the toolchain
-CROSS_PREFIX=arm-none-eabi-
-
-dirs-y += src/stm32f0 src/generic
-dirs-y += lib/cmsis-stm32f0/source
-dirs-y += lib/hal-stm32f0/source
-
-CFLAGS = -I$(OUT) -Isrc -I$(OUT)board-generic/ -std=gnu11 -O2 -MD \
-    -Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \
-    -ffunction-sections -fdata-sections
-CFLAGS += -flto -fno-use-linker-plugin
-CFLAGS += -mthumb -mcpu=cortex-m0 -g3
-CFLAGS += -Ilib/cmsis-core -Iout/board
-CFLAGS += -Ilib/cmsis-stm32f0/include -Ilib/cmsis-stm32f0
-CFLAGS += -Ilib/hal-stm32f0/include
-CFLAGS += -DSTM32F042x6 -DUSE_HAL_DRIVER
-
-# Add source files
-src-y += stm32f0/main.c stm32f0/timer.c stm32f0/gpio.c
-src-$(CONFIG_CANSERIAL) += stm32f0/can.c
-src-$(CONFIG_DEBUG_OUT) += stm32f0/log.c
-src-$(CONFIG_SERIAL) += stm32f0/serial.c
-src-y += generic/serial_irq.c
-src-y += generic/timer_irq.c
-src-$(CONFIG_HAVE_GPIO_ADC) += stm32f0/adc.c
-src-$(CONFIG_HAVE_GPIO_I2C) += stm32f0/i2c.c
-src-$(CONFIG_HAVE_GPIO_SPI) += stm32f0/spi.c
-src-y += $(addprefix ../, $(wildcard lib/hal-stm32f0/source/stm32f0xx_*.c))
-src-y += generic/crc16_ccitt.c generic/armcm_irq.c
-src-y += ../lib/cmsis-stm32f0/source/system_stm32f0xx.c
-
-# Add assembler build rules
-$(OUT)%.o: %.s $(OUT)autoconf.h $(OUT)board-link
-	@echo "  Assembling $@"
-	$(Q)$(AS) $< -o $@
-
-asmsrc-y = ../lib/cmsis-stm32f0/source/startup_stm32f042x6.s
-OBJS_klipper.elf += $(patsubst %.s, $(OUT)src/%.o,$(asmsrc-y))
-
-# Build the linker script
-$(OUT)stm32f0.ld: src/stm32f0/stm32f0.ld $(OUT)board-link
-	@echo "  Preprocessing $@"
-	$(Q)$(CPP) -P -MD -MT $@ -DFLASH_START=$(CONFIG_FLASH_START) $< -o $@
-
-CFLAGS_klipper.elf += -T $(OUT)stm32f0.ld
-CFLAGS_klipper.elf += --specs=nano.specs --specs=nosys.specs
-$(OUT)klipper.elf : $(OUT)stm32f0.ld
-
-# Binary output file rules
-target-y += $(OUT)klipper.bin
-
-$(OUT)klipper.bin: $(OUT)klipper.elf
-	@echo "  Creating binary file $@"
-	$(Q)$(OBJCOPY) -O binary $< $@
-
-$(OUT)klipper.hex: $(OUT)klipper.elf
-	@echo "  Creating hex file $@"
-	$(Q)$(OBJCOPY) -O ihex $< $@
-
-flash: $(OUT)klipper.hex
-	@echo "  Flashing hex file $<"
-	$(Q)$(STLINK) --format ihex --reset write $<
-
-debug: $(OUT)klipper.hex
-	@echo "  Remote debug:"
-	openocd -f interface/stlink.cfg -f target/stm32f0x.cfg
diff --git a/src/stm32f0/adc.c b/src/stm32f0/adc.c
deleted file mode 100644
index e4a4213c..00000000
--- a/src/stm32f0/adc.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- *  ADC functions on STM32F0
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include <stdbool.h> // bool
-#include "board/gpio.h" // gpio_adc_setup
-#include "board/io.h" // readb
-#include "stm32f0xx_hal.h"
-#include "internal.h" // GPIO
-#include "compiler.h" // ARRAY_SIZE
-#include "command.h" // shutdown
-#include "sched.h" // sched_shutdown
-
-DECL_CONSTANT("ADC_MAX", 4095);
-
-#define ADC_DELAY (240 * 8)
-static bool adc_busy;
-static uint8_t adc_current_channel;
-ADC_HandleTypeDef hadc;
-
-static const uint8_t adc_pins[] = {
-    GPIO('A', 0), GPIO('A', 1),
-#if !(CONFIG_SERIAL)
-    GPIO('A', 2), GPIO('A', 3),
-#endif
-    GPIO('A', 4), GPIO('A', 5), GPIO('A', 6), GPIO('A', 7),
-    GPIO('B', 1),
-    // Fake ADC on this GPIO (returns tempsensor value)
-    GPIO('B', 8)
-};
-
-static const uint32_t adc_channels[] = {
-    ADC_CHANNEL_0,
-    ADC_CHANNEL_1,
-#if !(CONFIG_SERIAL)
-    ADC_CHANNEL_2,
-    ADC_CHANNEL_3,
-#endif
-    ADC_CHANNEL_4,
-    ADC_CHANNEL_5,
-    ADC_CHANNEL_6,
-    ADC_CHANNEL_7,
-    ADC_CHANNEL_9,
-    // For tests
-    ADC_CHANNEL_TEMPSENSOR
-};
-
-struct gpio_adc
-gpio_adc_setup(uint8_t pin)
-{
-    // Find pin in adc_pins table
-    int chan;
-    ADC_ChannelConfTypeDef sConfig = {0};
-    for (chan=0; ; chan++) {
-        if (chan >= ARRAY_SIZE(adc_pins))
-            shutdown("Not a valid ADC pin");
-        if (adc_pins[chan] == pin) {
-            sConfig.Channel = adc_channels[chan];
-            break;
-        }
-    }
-
-    /**ADC GPIO Configuration
-    */
-    GPIO_InitTypeDef GPIO_InitStruct = {0};
-    GPIO_InitStruct.Pin = 1 << (pin % 16);;
-    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
-    GPIO_InitStruct.Pull = GPIO_NOPULL;
-    HAL_GPIO_Init((pin<8)?GPIOA:GPIOB, &GPIO_InitStruct);
-    /**Configure for the selected ADC regular channel to be converted.
-    */
-    sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
-    sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
-    HAL_ADC_ConfigChannel(&hadc, &sConfig);
-    HAL_ADCEx_Calibration_Start(&hadc);
-    return (struct gpio_adc){ .pin = adc_channels[chan] };
-}
-
-// Try to sample a value. Returns zero if sample ready, otherwise
-// returns the number of clock ticks the caller should wait before
-// retrying this function.
-uint32_t
-gpio_adc_sample(struct gpio_adc g)
-{
-    /* ADC not busy, start conversion */
-    if (!readb(&adc_busy)) {
-        HAL_ADC_Start(&hadc);
-        adc_busy = true;
-        adc_current_channel = g.pin;
-        return ADC_DELAY;
-    /* ADC finished conversion for this channel */
-    } else if (HAL_ADC_PollForConversion(&hadc, 100) == HAL_OK) {
-        __HAL_ADC_CLEAR_FLAG(&hadc, ADC_FLAG_EOS);
-        adc_busy = false;
-        return 0;
-    }
-    /* Wants to sample another channel, or not finished yet */
-    return ADC_DELAY;
-}
-
-// Read a value; use only after gpio_adc_sample() returns zero
-uint16_t
-gpio_adc_read(struct gpio_adc g)
-{
-    return HAL_ADC_GetValue(&hadc);
-}
-
-// Cancel a sample that may have been started with gpio_adc_sample()
-void
-gpio_adc_cancel_sample(struct gpio_adc g)
-{
-    if (readb(&adc_busy) && readl(&adc_current_channel) == g.pin) {
-        adc_busy = false;
-        HAL_ADC_Stop(&hadc);
-    }
-}
-
-/**
-  * @brief ADC Initialization Function
-  * @param None
-  * @retval None
-  */
-void AdcInit(void)
-{
-    /**Configure the global features of the ADC (Clock,
-     * Resolution, Data Alignment and number of conversion)
-    */
-    hadc.Instance = ADC1;
-    hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
-    hadc.Init.Resolution = ADC_RESOLUTION_12B;
-    hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
-    hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
-    hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
-    hadc.Init.LowPowerAutoWait = DISABLE;
-    hadc.Init.LowPowerAutoPowerOff = DISABLE;
-    hadc.Init.ContinuousConvMode = DISABLE;
-    hadc.Init.DiscontinuousConvMode = DISABLE;
-    hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
-    hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
-    hadc.Init.DMAContinuousRequests = DISABLE;
-    hadc.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
-    HAL_ADC_Init(&hadc);
-}
-DECL_INIT(AdcInit);
-
-
-/**
-* @brief ADC MSP Initialization
-* @param hadc: ADC handle pointer
-* @retval None
-*/
-void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
-{
-    if(hadc->Instance==ADC1)
-    {
-        /* Peripheral clock enable */
-        __HAL_RCC_ADC1_CLK_ENABLE();
-        __HAL_RCC_GPIOA_CLK_ENABLE();
-    }
-}
diff --git a/src/stm32f0/can.c b/src/stm32f0/can.c
deleted file mode 100644
index 6ce9aad4..00000000
--- a/src/stm32f0/can.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * Serial over CAN emulation for STM32F042 boards.
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include "stm32f0xx_hal.h"
-#include <string.h>
-#include "can.h"
-#include "command.h" // encoder
-#include "board/serial_irq.h" // serial_enable_tx_irq
-#include "sched.h" // DECL_INIT
-#include "log.h"
-
-CAN_HandleTypeDef hcan;
-CanTxMsgTypeDef    TxMessage;
-CanRxMsgTypeDef    RxMessage;
-static uint16_t MyCanId = 0;
-
-
-void CanTransmit(uint32_t id, uint32_t dlc, uint8_t *pkt)
-{
-    memcpy(hcan.pTxMsg->Data, pkt, dlc);
-    hcan.pTxMsg->StdId = id;
-    hcan.pTxMsg->DLC = dlc;
-    HAL_CAN_Transmit_IT(&hcan);
-}
-
-// Convert Unique 96-bit value into 48 bit representation
-static void PackUuid(uint8_t* u)
-{
-    for(int i=0; i<SHORT_UUID_LEN; i++) {
-        u[i] = *((uint8_t*)(STM32_UUID_ADDR+i)) ^
-                *((uint8_t*)(STM32_UUID_ADDR+i+SHORT_UUID_LEN));
-    }
-}
-
-static void CanUUIDResp(void)
-{
-    uint8_t short_uuid[SHORT_UUID_LEN];
-    PackUuid(short_uuid);
-    CanTransmit(PKT_ID_UUID_RESP, SHORT_UUID_LEN, short_uuid);
-}
-
-void CanInit(void)
-{
-    // Master reset
-    //SET_BIT(CAN->MCR, CAN_MCR_RESET);
-
-    hcan.Instance = CAN;
-    hcan.Init.Prescaler = 12;
-    hcan.Init.Mode = CAN_MODE_NORMAL;
-    hcan.Init.SJW = CAN_SJW_1TQ;
-    hcan.Init.BS1 = CAN_BS1_5TQ;
-    hcan.Init.BS2 = CAN_BS2_2TQ;
-    hcan.Init.TTCM = DISABLE;
-    hcan.Init.ABOM = DISABLE;
-    hcan.Init.AWUM = DISABLE;
-    hcan.Init.NART = ENABLE;
-    hcan.Init.RFLM = DISABLE;
-    hcan.Init.TXFP = DISABLE;
-    HAL_CAN_Init(&hcan);
-    hcan.pTxMsg = &TxMessage;
-    hcan.pRxMsg = &RxMessage;
-
-    /*##-2- Configure the CAN Filter #######################################*/
-    CAN_FilterConfTypeDef sFilterConfig;
-    sFilterConfig.FilterNumber = 0;
-    sFilterConfig.FilterMode = CAN_FILTERMODE_IDLIST;
-    sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
-    sFilterConfig.FilterIdHigh = PKT_ID_UUID<<5;
-    sFilterConfig.FilterIdLow = 0x0000;
-    sFilterConfig.FilterMaskIdHigh = PKT_ID_SET<<5;
-    sFilterConfig.FilterMaskIdLow = 0x0000;
-    sFilterConfig.FilterFIFOAssignment = CAN_FIFO0;
-    sFilterConfig.FilterActivation = ENABLE;
-    HAL_CAN_ConfigFilter(&hcan, &sFilterConfig);
-
-    /*##-3- Configure Transmission process #################################*/
-    hcan.pTxMsg->ExtId = 0;
-    HAL_CAN_Receive_IT(&hcan, CAN_FIFO0);
-
-    /* Request for port */
-    CanUUIDResp();
-}
-DECL_INIT(CanInit);
-
-void HAL_CAN_RxCpltCallback(CAN_HandleTypeDef* h) {
-    int i;
-
-    if(!MyCanId) { // If serial not assigned yet
-        if(h->pRxMsg->StdId == PKT_ID_UUID && h->pRxMsg->DLC == 0) {
-            // Just inform host about my UUID
-            CanUUIDResp();
-        } else if (h->pRxMsg->StdId == PKT_ID_SET) {
-            // compare my UUID with packet to check if this packet mine
-            uint8_t short_uuid[SHORT_UUID_LEN];
-            PackUuid(short_uuid);
-            if (memcmp(&(h->pRxMsg->Data[2]), short_uuid,
-                    SHORT_UUID_LEN) == 0) {
-                memcpy(&MyCanId, h->pRxMsg->Data, sizeof(uint16_t));
-                CAN_FilterConfTypeDef sFilterConfig;
-                sFilterConfig.FilterNumber = 0;
-                sFilterConfig.FilterMode = CAN_FILTERMODE_IDLIST;
-                sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
-                // Personal ID
-                sFilterConfig.FilterIdHigh = MyCanId<<5;
-                sFilterConfig.FilterIdLow = 0x0000;
-                // Catch reset command
-                sFilterConfig.FilterMaskIdHigh = PKT_ID_UUID<<5;
-                sFilterConfig.FilterMaskIdLow = 0x0000;
-                sFilterConfig.FilterFIFOAssignment = CAN_FIFO0;
-                sFilterConfig.FilterActivation = ENABLE;
-                // Disable 'set address' filter and enable only my packets
-                HAL_CAN_ConfigFilter(&hcan, &sFilterConfig);
-            }
-        }
-    } else {
-        if(h->pRxMsg->StdId == MyCanId) {
-            if(h->pRxMsg->DLC == 0) {
-                // empty packet == ping request
-                hcan.pTxMsg->StdId = MyCanId+1;
-                hcan.pTxMsg->DLC = 0;
-                HAL_CAN_Transmit_IT(&hcan);
-            } else {
-                for(i=0; i < h->pRxMsg->DLC; i++ ) {
-                    serial_rx_byte(h->pRxMsg->Data[i]);
-                }
-            }
-        } else if (h->pRxMsg->StdId == PKT_ID_UUID && h->pRxMsg->DLC > 0) {
-            if (memcmp(&(h->pRxMsg->Data), &MyCanId, 2) == 0) {
-                // Reset from host
-                NVIC_SystemReset();
-            }
-        }
-    }
-    HAL_CAN_Receive_IT(&hcan, CAN_FIFO0);
-}
-
-void HAL_CAN_ErrorCallback(CAN_HandleTypeDef *h)
-{
-    // Overrun handling - drop damaged packet
-    HAL_CAN_Receive_IT(&hcan, CAN_FIFO0);
-}
-
-/**
-  * @brief This function handles HDMI-CEC and CAN global interrupts /
-  *  HDMI-CEC wake-up interrupt through EXTI line 27.
-  */
-void CEC_CAN_IRQHandler(void)
-{
-    HAL_CAN_IRQHandler(&hcan);
-}
-
-void
-serial_enable_tx_irq(void)
-{
-    if(MyCanId == 0)
-        // Serial port not initialized
-        return;
-
-    int i=0;
-    for (;i<8;)
-    {
-        if(serial_get_tx_byte(&(hcan.pTxMsg->Data[i])) == -1) {
-            break;
-        }
-        i++;
-    }
-    if (i>0) {
-        hcan.pTxMsg->StdId = MyCanId+1;
-        hcan.pTxMsg->DLC = i;
-        HAL_CAN_Transmit_IT(&hcan);
-    }
-}
-
-void HAL_CAN_TxCpltCallback(CAN_HandleTypeDef* hcan)
-{
-    // if we still have some data to transmit
-    serial_enable_tx_irq();
-}
-
-/*
- * @brief CAN MSP Initialization
- * @param h: CAN handle pointer
- * @retval None
- */
-void HAL_CAN_MspInit(CAN_HandleTypeDef* h)
-{
-
-    __HAL_REMAP_PIN_ENABLE(HAL_REMAP_PA11_PA12);
-
-    GPIO_InitTypeDef GPIO_InitStruct = {0};
-    if(h->Instance==CAN)
-    {
-        /* Peripheral clock enable */
-        __HAL_RCC_CAN1_CLK_ENABLE();
-
-        __HAL_RCC_GPIOA_CLK_ENABLE();
-        /**CAN GPIO Configuration
-        PA11     ------> CAN_RX
-        PA12     ------> CAN_TX
-        */
-        GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12;
-        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-        GPIO_InitStruct.Pull = GPIO_NOPULL;
-        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-        GPIO_InitStruct.Alternate = GPIO_AF4_CAN;
-        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-        /* CAN interrupt Init */
-        HAL_NVIC_SetPriority(CEC_CAN_IRQn, 0, 0);
-        HAL_NVIC_EnableIRQ(CEC_CAN_IRQn);
-    }
-}
diff --git a/src/stm32f0/can.h b/src/stm32f0/can.h
deleted file mode 100644
index 6b3cb2a4..00000000
--- a/src/stm32f0/can.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef CORE_INC_CAN_H_
-#define CORE_INC_CAN_H_
-
-// Read UUID  (6bytes)
-#define PKT_ID_UUID (0x321)
-// Set address (2bytes) to UUID (6b)
-#define PKT_ID_SET (0x322)
-// UUID response from slave  (6bytes)
-#define PKT_ID_UUID_RESP (0x323)
-
-#define STM32_UUID_ADDR (0x1FFFF7AC)
-#define SHORT_UUID_LEN (6)
-
-void CanInit(void);
-void CanTransmit(uint32_t id, uint32_t dlc, uint8_t *pkt);
-
-#endif /* CORE_INC_CAN_H_ */
diff --git a/src/stm32f0/gpio.c b/src/stm32f0/gpio.c
deleted file mode 100644
index a7849484..00000000
--- a/src/stm32f0/gpio.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- *  GPIO functions on STM32F042 boards.
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include "board/gpio.h" // gpio_out_setup
-#include "stm32f0xx_hal.h"
-#include "internal.h" // GPIO
-#include "board/irq.h" // irq_save
-#include "compiler.h" // ARRAY_SIZE
-#include "sched.h" // sched_shutdown
-#include "command.h" // shutdown
-
-DECL_ENUMERATION_RANGE("pin", "PA0", GPIO('A', 0), 11);
-DECL_ENUMERATION_RANGE("pin", "PB0", GPIO('B', 0), 9);
-DECL_ENUMERATION_RANGE("pin", "PF0", GPIO('F', 0), 2);
-
-GPIO_TypeDef *const digital_regs[] = {
-    GPIOA, GPIOB, GPIOC, 0, 0, GPIOF
-};
-
-// <port:4><pin:4>
-uint8_t const avail_pins[] = {
-    0x0 + 0x0, //PA0
-    0x0 + 0x1, //PA1
-#if !(CONFIG_SERIAL)
-    0x0 + 0x2, //PA2 - USART pins
-    0x0 + 0x3, //PA3
-#endif
-    0x0 + 0x4, //PA4
-    0x0 + 0x5, //PA5
-    0x0 + 0x6, //PA6
-    0x0 + 0x7, //PA7
-#if !(CONFIG_CANSERIAL)
-    0x0 + 0x9, //PA9 - but remapped in CAN mode to PA11,PA12
-    0x0 + 0xa, //PA10
-#endif
-    0x10 + 0x1, //PB1
-    0x10 + 0x8, //PB8
-    0x50 + 0x0, //PF0
-    0x50 + 0x1, //PF1
-};
-
-/****************************************************************
- * General Purpose Input Output (GPIO) pins
- ****************************************************************/
-
-static uint8_t
-gpio_check_pin(uint8_t pin)
-{
-    int i;
-    for(i=0; i<ARRAY_SIZE(avail_pins); i++) {
-        if (avail_pins[i] == pin)
-            return i;
-    }
-    return 0xFF;
-}
-
-struct gpio_out
-gpio_out_setup(uint8_t pin, uint8_t val)
-{
-    struct gpio_out g = { .pin=pin };
-    if (gpio_check_pin(pin) < 0xFF) {
-        gpio_out_reset(g, val);
-    } else {
-        shutdown("Not an output pin");
-    }
-    return g;
-}
-
-void
-gpio_out_reset(struct gpio_out g, uint8_t val)
-{
-    GPIO_InitTypeDef GPIO_InitStruct = {0};
-    GPIO_InitStruct.Pin = 1 << (g.pin % 16);
-    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-    HAL_GPIO_Init(digital_regs[GPIO2PORT(g.pin)], &GPIO_InitStruct);
-    HAL_GPIO_WritePin(digital_regs[GPIO2PORT(g.pin)], 1 << (g.pin % 16), val);
-}
-
-void
-gpio_out_write(struct gpio_out g, uint8_t val)
-{
-    HAL_GPIO_WritePin(digital_regs[GPIO2PORT(g.pin)], 1 << (g.pin % 16), val);
-}
-
-struct gpio_in
-gpio_in_setup(uint8_t pin, int8_t pull_up)
-{
-    struct gpio_in g = { .pin=pin };
-    if (gpio_check_pin(pin) < 0xFF) {
-        gpio_in_reset(g, pull_up);
-    } else {
-        shutdown("Not an input pin");
-    }
-    return g;
-}
-
-void
-gpio_in_reset(struct gpio_in g, int8_t pull_up)
-{
-    irqstatus_t flag = irq_save();
-    GPIO_InitTypeDef GPIO_InitStruct = {0};
-    GPIO_InitStruct.Pin = 1 << (g.pin % 16);
-    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-    GPIO_InitStruct.Pull = (pull_up)?GPIO_PULLUP:GPIO_NOPULL;
-    HAL_GPIO_Init(digital_regs[GPIO2PORT(g.pin)], &GPIO_InitStruct);
-    irq_restore(flag);
-}
-
-uint8_t
-gpio_in_read(struct gpio_in g)
-{
-    return HAL_GPIO_ReadPin(digital_regs[GPIO2PORT(g.pin)], 1 << (g.pin % 16));
-}
-
-void
-gpio_out_toggle_noirq(struct gpio_out g)
-{
-    HAL_GPIO_TogglePin(digital_regs[GPIO2PORT(g.pin)], 1 << (g.pin % 16));
-}
-
-void
-gpio_out_toggle(struct gpio_out g)
-{
-    irqstatus_t flag = irq_save();
-    gpio_out_toggle_noirq(g);
-    irq_restore(flag);
-}
-
-void gpio_init(void)
-{
-    /* GPIO Ports Clock Enable */
-    __HAL_RCC_GPIOA_CLK_ENABLE();
-    __HAL_RCC_GPIOB_CLK_ENABLE();
-    __HAL_RCC_GPIOF_CLK_ENABLE();
-}
diff --git a/src/stm32f0/gpio.h b/src/stm32f0/gpio.h
deleted file mode 100644
index 7127a496..00000000
--- a/src/stm32f0/gpio.h
+++ /dev/null
@@ -1,55 +0,0 @@
-#ifndef __GENERIC_GPIO_H
-#define __GENERIC_GPIO_H
-
-#include <stdint.h> // uint8_t
-
-struct gpio_out {
-    uint8_t pin;
-};
-struct gpio_out gpio_out_setup(uint8_t pin, uint8_t val);
-void gpio_out_reset(struct gpio_out g, uint8_t val);
-void gpio_out_toggle_noirq(struct gpio_out g);
-void gpio_out_toggle(struct gpio_out g);
-void gpio_out_write(struct gpio_out g, uint8_t val);
-
-struct gpio_in {
-    uint8_t pin;
-};
-struct gpio_in gpio_in_setup(uint8_t pin, int8_t pull_up);
-void gpio_in_reset(struct gpio_in g, int8_t pull_up);
-uint8_t gpio_in_read(struct gpio_in g);
-
-struct gpio_pwm {
-    uint8_t pin;
-};
-struct gpio_pwm gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val);
-void gpio_pwm_write(struct gpio_pwm g, uint8_t val);
-
-struct gpio_adc {
-    uint8_t pin;
-};
-struct gpio_adc gpio_adc_setup(uint8_t pin);
-uint32_t gpio_adc_sample(struct gpio_adc g);
-uint16_t gpio_adc_read(struct gpio_adc g);
-void gpio_adc_cancel_sample(struct gpio_adc g);
-
-struct spi_config {
-    uint32_t cfg;
-};
-struct spi_config spi_setup(uint32_t bus, uint8_t mode, uint32_t rate);
-void spi_prepare(struct spi_config config);
-void spi_transfer(struct spi_config config, uint8_t receive_data
-                  , uint8_t len, uint8_t *data);
-
-struct i2c_config {
-    uint8_t addr;
-};
-
-struct i2c_config i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr);
-void i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write);
-void i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
-              , uint8_t read_len, uint8_t *read);
-
-void gpio_check_busy(uint8_t pin);
-
-#endif // gpio.h
diff --git a/src/stm32f0/i2c.c b/src/stm32f0/i2c.c
deleted file mode 100644
index 55542125..00000000
--- a/src/stm32f0/i2c.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/*
- *  i2c support on STM32F0
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include "stm32f0xx_hal.h"
-#include "command.h" // shutdown
-#include "board/gpio.h" // i2c_setup
-#include "sched.h" // sched_shutdown
-#include "command.h" // shutdown
-#include "board/misc.h" // timer_is_before
-
-I2C_HandleTypeDef hi2c1;
-
-struct i2c_config i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr)
-{
-    GPIO_InitTypeDef GPIO_InitStruct = {0};
-    /**I2C1 GPIO Configuration
-    PF0-OSC_IN     ------> I2C1_SDA
-    PF1-OSC_OUT     ------> I2C1_SCL
-    */
-    GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
-    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-    GPIO_InitStruct.Pull = GPIO_PULLUP;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-    GPIO_InitStruct.Alternate = GPIO_AF1_I2C1;
-    HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
-
-    hi2c1.Instance = I2C1;
-    hi2c1.Init.Timing = 0x2000090E;
-    hi2c1.Init.OwnAddress1 = addr;
-    hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
-    hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
-    hi2c1.Init.OwnAddress2 = 0;
-    hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
-    hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
-    hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
-    HAL_I2C_Init(&hi2c1);
-    /** Configure Analogue filter
-    */
-    HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE);
-    /** Configure Digital filter
-    */
-    HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0);
-    return (struct i2c_config){ .addr = addr };
-}
-
-static void
-i2c_to_check(uint32_t timeout)
-{
-    if (!timer_is_before(timer_read_time(), timeout))
-        shutdown("i2c timeout");
-}
-
-void i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
-{
-    uint32_t timeout = timer_read_time() + timer_from_us(5000);
-    while(HAL_I2C_Master_Transmit(&hi2c1, config.addr, write,
-            (uint16_t)write_len, (uint32_t)1000)!= HAL_OK) {
-         if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF) {
-             shutdown("Buffer error");
-         }
-         i2c_to_check(timeout);
-     }
-}
-
-void i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
-              , uint8_t read_len, uint8_t *read)
-{
-    uint32_t timeout = timer_read_time() + timer_from_us(5000);
-    i2c_write(config, reg_len, reg);
-    while(HAL_I2C_Master_Receive(&hi2c1, config.addr, read,
-            (uint16_t)read_len, (uint32_t)1000)!= HAL_OK) {
-         if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF) {
-             shutdown("Buffer error");
-         }
-         i2c_to_check(timeout);
-     }
-}
-
-/**
-* @brief I2C MSP Initialization
-* @param hi2c: I2C handle pointer
-* @retval None
-*/
-void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
-{
-    if(hi2c->Instance==I2C1)
-    {
-        /* Peripheral clock enable */
-        __HAL_RCC_GPIOF_CLK_ENABLE();
-        __HAL_RCC_I2C1_CLK_ENABLE();
-    }
-}
diff --git a/src/stm32f0/internal.h b/src/stm32f0/internal.h
deleted file mode 100644
index 35c3000f..00000000
--- a/src/stm32f0/internal.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef __STM32F0_INTERNAL_H
-#define __STM32F0_INTERNAL_H
-// Local definitions for STM32F0 code
-
-#include "stm32f0xx.h"
-
-#define GPIO(PORT, NUM) (((PORT)-'A') * 16 + (NUM))
-#define GPIO2PORT(PIN) ((PIN) / 16)
-
-extern uint8_t const avail_pins[];
-
-void gpio_init(void);
-void TimerInit(void);
-
-#endif // internal.h
diff --git a/src/stm32f0/log.c b/src/stm32f0/log.c
deleted file mode 100644
index be9c48b1..00000000
--- a/src/stm32f0/log.c
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * log.c
- * This file not required for regular Klipper usage, but hw/sw developer
- * can use USART TX pin instead SWO for debugging purposes
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- */
-
-#include "string.h"
-#include "stm32f0xx_hal.h"
-#include "log.h"
-
-UART_HandleTypeDef huart2;
-
-void LogInit(void)
-{
-    huart2.Instance = USART2;
-    huart2.Init.BaudRate = 115200;
-    huart2.Init.WordLength = UART_WORDLENGTH_8B;
-    huart2.Init.StopBits = UART_STOPBITS_1;
-    huart2.Init.Parity = UART_PARITY_NONE;
-    huart2.Init.Mode = UART_MODE_TX;
-    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
-    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
-    huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
-    huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
-    HAL_UART_Init(&huart2);
-
-    lprint("hello");
-}
-
-/**
-* @brief String out
-* @param msg: Null-terminated string
-* @retval None
-*/
-void lprint(char *msg)
-{
-    HAL_UART_Transmit(&huart2, (uint8_t *)msg, strlen(msg), 100);
-}
-
-/**
-* @brief Binary data out
-* @param msg: binary data
-* @param len: data length
-* @retval None
-*/
-void lnprint(char *msg, size_t len)
-{
-    HAL_UART_Transmit(&huart2, (uint8_t *)msg, len, 100);
-}
-
-/**
-* @brief UART MSP Initialization
-* @param huart: UART handle pointer
-* @retval None
-*/
-void HAL_UART_MspInit(UART_HandleTypeDef* huart)
-{
-
-  GPIO_InitTypeDef GPIO_InitStruct = {0};
-  if(huart->Instance==USART2)
-  {
-    __HAL_RCC_USART2_CLK_ENABLE();
-
-    __HAL_RCC_GPIOA_CLK_ENABLE();
-    /**USART2 GPIO Configuration
-    PA2     ------> USART2_TX
-    PA3     ------> USART2_RX
-    */
-    GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
-    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-    GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-    GPIO_InitStruct.Alternate = GPIO_AF1_USART2;
-    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-  }
-}
diff --git a/src/stm32f0/log.h b/src/stm32f0/log.h
deleted file mode 100644
index fda8a9d8..00000000
--- a/src/stm32f0/log.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * log.h
- *
- *  Created on: Jan 17, 2019
- *      Author: eug
- */
-
-#ifndef CORE_INC_LOG_H_
-#define CORE_INC_LOG_H_
-
-
-void LogInit(void);
-
-void lprint(char *msg);
-void lnprint(char *msg, size_t len);
-
-
-#endif /* CORE_INC_LOG_H_ */
diff --git a/src/stm32f0/main.c b/src/stm32f0/main.c
deleted file mode 100644
index 1a167a32..00000000
--- a/src/stm32f0/main.c
+++ /dev/null
@@ -1,192 +0,0 @@
-/*
- * Main starting point for STM32F042 boards.
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include "stm32f0xx_hal.h"
-#include "autoconf.h"
-#include "command.h" // DECL_CONSTANT
-#include "board/misc.h" // timer_read_time
-#include "sched.h" // sched_main
-#include "internal.h"
-#include "can.h"
-#include "log.h"
-
-DECL_CONSTANT_STR("MCU","stm32f042");
-
-static IWDG_HandleTypeDef hiwdg;
-
-/****************************************************************
- * dynamic memory pool
- ****************************************************************/
-
-static char dynmem_pool[3 * 1024];
-
-// Return the start of memory available for dynamic allocations
-void *
-dynmem_start(void)
-{
-    return dynmem_pool;
-}
-
-// Return the end of memory available for dynamic allocations
-void *
-dynmem_end(void)
-{
-    return &dynmem_pool[sizeof(dynmem_pool)];
-}
-
-/****************************************************************
- * misc functions
- ****************************************************************/
-
-void
-command_reset(uint32_t *args)
-{
-    NVIC_SystemReset();
-}
-DECL_COMMAND_FLAGS(command_reset, HF_IN_SHUTDOWN, "reset");
-
-void clock_config(void)
-{
-    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
-    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
-    RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
-
-    /**Initializes the CPU, AHB and APB busses clocks
-    */
-    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI
-            |RCC_OSCILLATORTYPE_HSI14|RCC_OSCILLATORTYPE_HSI48
-            |RCC_OSCILLATORTYPE_LSI;
-    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-    RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
-    RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
-    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
-    RCC_OscInitStruct.HSI14CalibrationValue = 16;
-    RCC_OscInitStruct.LSIState = RCC_LSI_ON;
-    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
-    HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-    /**Initializes the CPU, AHB and APB busses clocks
-    */
-    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
-                              |RCC_CLOCKTYPE_PCLK1;
-    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI48;
-    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
-    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1);
-
-    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_I2C1|RCC_PERIPHCLK_RTC;
-    PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_HSI;
-    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
-}
-
-void
-watchdog_reset(void)
-{
-    HAL_IWDG_Refresh(&hiwdg);
-}
-DECL_TASK(watchdog_reset);
-
-void
-watchdog_init(void)
-{
-    hiwdg.Instance = IWDG;
-    hiwdg.Init.Prescaler = IWDG_PRESCALER_16;
-    hiwdg.Init.Window = 4095;
-    hiwdg.Init.Reload = 4095;
-    //HAL_IWDG_Init(&hiwdg); ToDo enable after debug
-}
-DECL_INIT(watchdog_init);
-
-// Main entry point
-int
-main(void)
-{
-    HAL_Init();
-
-    clock_config();
-    gpio_init();
-#if (CONFIG_DEBUG_OUT)
-    LogInit();
-#endif
-    sched_main();
-    return 0;
-}
-
-void __attribute__((weak)) lprint(char *msg) {}
-void __attribute__((weak)) lnprint(char *msg, size_t len) {}
-
-/*
- * MSP init functions ( __weak replacement )
- */
-
-/*
- * Initializes the Global MSP.
- */
-void HAL_MspInit(void)
-{
-  __HAL_RCC_SYSCFG_CLK_ENABLE();
-  __HAL_RCC_PWR_CLK_ENABLE();
-  __HAL_RCC_WWDG_CLK_ENABLE();
-}
-
-/****************************************************************
- * Debug helper (taken from https://community.arm.com/)
- * In case of Hard Fault it helps to find fault reason
- * on Cortex-M0 chips
- ****************************************************************/
-
-void hard_fault_handler_c(unsigned long *hardfault_args){
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
-    volatile unsigned long stacked_r0 ;
-    volatile unsigned long stacked_r1 ;
-    volatile unsigned long stacked_r2 ;
-    volatile unsigned long stacked_r3 ;
-    volatile unsigned long stacked_r12 ;
-    volatile unsigned long stacked_lr ;
-    volatile unsigned long stacked_pc ;
-    volatile unsigned long stacked_psr ;
-    volatile unsigned long _CFSR ;
-    volatile unsigned long _HFSR ;
-    volatile unsigned long _DFSR ;
-    volatile unsigned long _AFSR ;
-    volatile unsigned long _BFAR ;
-    volatile unsigned long _MMAR ;
-
-    stacked_r0 = ((unsigned long)hardfault_args[0]) ;
-    stacked_r1 = ((unsigned long)hardfault_args[1]) ;
-    stacked_r2 = ((unsigned long)hardfault_args[2]) ;
-    stacked_r3 = ((unsigned long)hardfault_args[3]) ;
-    stacked_r12 = ((unsigned long)hardfault_args[4]) ;
-    stacked_lr = ((unsigned long)hardfault_args[5]) ;
-    stacked_pc = ((unsigned long)hardfault_args[6]) ;
-    stacked_psr = ((unsigned long)hardfault_args[7]) ;
-
-    // Configurable Fault Status Register
-    // Consists of MMSR, BFSR and UFSR
-    _CFSR = (*((volatile unsigned long *)(0xE000ED28))) ;
-
-    // Hard Fault Status Register
-    _HFSR = (*((volatile unsigned long *)(0xE000ED2C))) ;
-
-    // Debug Fault Status Register
-    _DFSR = (*((volatile unsigned long *)(0xE000ED30))) ;
-
-    // Auxiliary Fault Status Register
-    _AFSR = (*((volatile unsigned long *)(0xE000ED3C))) ;
-
-    // Read the Fault Address Registers. These may not contain valid values.
-    // Check BFARVALID/MMARVALID to see if they are valid values
-    // MemManage Fault Address Register
-    _MMAR = (*((volatile unsigned long *)(0xE000ED34))) ;
-    // Bus Fault Address Register
-    _BFAR = (*((volatile unsigned long *)(0xE000ED38))) ;
-
-    __asm("BKPT #0\n") ; // Break into the debugger
-#pragma GCC diagnostic pop
-}
diff --git a/src/stm32f0/serial.c b/src/stm32f0/serial.c
deleted file mode 100644
index 103a0d70..00000000
--- a/src/stm32f0/serial.c
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
- * Serial communication for STM32F042 boards.
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include "stm32f0xx_hal.h"
-#include <string.h>
-#include "autoconf.h" // CONFIG_SERIAL_BAUD
-#include "board/serial_irq.h" // serial_rx_byte
-#include "sched.h" // DECL_INIT
-
-UART_HandleTypeDef huart2;
-static uint8_t rxbuf, txbuf;
-
-void USART2_IRQHandler(void)
-{
-  HAL_UART_IRQHandler(&huart2);
-}
-
-/**
-  * @brief USART2 Initialization Function
-  * @param None
-  * @retval None
-  */
-void UartInit(void)
-{
-    huart2.Instance = USART2;
-    huart2.Init.BaudRate = CONFIG_SERIAL_BAUD;
-    huart2.Init.WordLength = UART_WORDLENGTH_8B;
-    huart2.Init.StopBits = UART_STOPBITS_1;
-    huart2.Init.Parity = UART_PARITY_NONE;
-    huart2.Init.Mode = UART_MODE_TX_RX;
-    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
-    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
-    huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
-    huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
-    HAL_UART_Init(&huart2);
-
-    HAL_UART_Receive_IT(&huart2,&rxbuf,(uint16_t)1);
-}
-DECL_INIT(UartInit);
-
-void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
-{
-    if (huart == &huart2) {
-        serial_rx_byte(rxbuf);
-        HAL_UART_Receive_IT(&huart2,&rxbuf,(uint16_t)1);
-    }
-}
-
-void serial_enable_tx_irq(void)
-{
-    while(huart2.gState != HAL_UART_STATE_READY);
-    if(serial_get_tx_byte(&txbuf) == 0) {
-        HAL_UART_Transmit_IT(&huart2,&txbuf,(uint16_t)1);
-    }
-}
-
-void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
-{
-    if (huart == &huart2)
-        serial_enable_tx_irq();
-}
-
-/**
-* @brief UART MSP Initialization
-* @param huart: UART handle pointer
-* @retval None
-*/
-void HAL_UART_MspInit(UART_HandleTypeDef* huart)
-{
-
-  GPIO_InitTypeDef GPIO_InitStruct = {0};
-  if(huart->Instance==USART2)
-  {
-    /* Peripheral clock enable */
-    __HAL_RCC_USART2_CLK_ENABLE();
-
-    __HAL_RCC_GPIOA_CLK_ENABLE();
-    /**USART2 GPIO Configuration
-    PA2     ------> USART2_TX
-    PA3     ------> USART2_RX
-    */
-    GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
-    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-    GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-    GPIO_InitStruct.Alternate = GPIO_AF1_USART2;
-    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-    /* USART2 interrupt Init */
-    HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
-    HAL_NVIC_EnableIRQ(USART2_IRQn);
-  }
-}
diff --git a/src/stm32f0/spi.c b/src/stm32f0/spi.c
deleted file mode 100644
index 1c8a3b77..00000000
--- a/src/stm32f0/spi.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- *  SPI support on STM32F0 - without HAL for space saving
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- */
-
-#include <string.h> // memcpy
-#include "stm32f0xx_hal.h"
-#include "command.h" // shutdown
-#include "board/gpio.h" // spi_setup
-#include "sched.h" // sched_shutdown
-#include "log.h"
-
-void spi_hw_setup(uint32_t rate)
-{
-    GPIO_InitTypeDef GPIO_InitStruct = {0};
-
-    /* SPI1 init - no HAL */
-    __HAL_RCC_SPI1_CLK_ENABLE();
-    __HAL_RCC_GPIOA_CLK_ENABLE();
-
-    /**SPI1 GPIO Configuration
-    PA5     ------> SPI1_SCK
-    PA6     ------> SPI1_MISO
-    PA7     ------> SPI1_MOSI
-    */
-    GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
-    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-    GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-    GPIO_InitStruct.Alternate = GPIO_AF0_SPI1;
-    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-    if (rate > 800000) {
-        SPI1->CR1 = SPI_BAUDRATEPRESCALER_64;
-    } else {
-        SPI1->CR1 = SPI_BAUDRATEPRESCALER_256;
-    }
-
-    SPI1->CR1 |= SPI_MODE_MASTER | SPI_DIRECTION_2LINES | SPI_CR1_SSM |
-            SPI_POLARITY_LOW | SPI_PHASE_1EDGE |
-            SPI_FIRSTBIT_MSB | SPI_CRCCALCULATION_DISABLE;
-
-    SPI1->CR2 =  SPI_NSS_PULSE_DISABLE | SPI_DATASIZE_8BIT |
-            SPI_RXFIFO_THRESHOLD_QF;
-
-    SPI1->CR1 |= SPI_CR1_SPE; // Enable
-}
-
-struct spi_config
-spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
-{
-    if (bus > 0 || !rate)
-        shutdown("Invalid spi_setup parameters");
-
-    spi_hw_setup(rate);
-    return (struct spi_config){ .cfg = SPI1->CR1 };
-}
-
-void
-spi_prepare(struct spi_config config)
-{
-    SPI1->CR1 = config.cfg;
-}
-
-void
-spi_transfer(struct spi_config config, uint8_t receive_data,
-             uint8_t len, uint8_t *data)
-{
-    uint8_t rxptr = 0;
-    while (rxptr<len) {
-        while(!(SPI1->SR & SPI_SR_TXE));
-        __DMB();
-        *((uint8_t*)&(SPI1->DR)) = data[rxptr]; // Hack with pointers
-        // to write/read only 8 bits from 16-bit DR (see errata)
-        while(!(SPI1->SR & SPI_SR_RXNE));
-        __DMB();
-        if(receive_data) {
-            data[rxptr] = *((uint8_t*)&(SPI1->DR));
-        }
-        rxptr ++;
-    }
-}
diff --git a/src/stm32f0/stm32f0.ld b/src/stm32f0/stm32f0.ld
deleted file mode 100644
index 88851a5f..00000000
--- a/src/stm32f0/stm32f0.ld
+++ /dev/null
@@ -1,111 +0,0 @@
-/* Linker script for STM32F042F6Px Device with 32KByte FLASH, 6KByte RAM
-   This file is taken from lib/cmsis-stm32f0/source/STM32F042F6Px_FLASH.ld
-*/
-
-ENTRY(Reset_Handler)
-
-MEMORY
-{
-  FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 32K
-  RAM  (xrw) : ORIGIN = 0x20000000, LENGTH = 6K
-}
-
-/* highest address of the user mode stack */
-_estack = 0x20001800;
-
-SECTIONS
-{
-    /* Interrupt vector table */
-    .isr_vector :
-    {
-        . = ALIGN(4);
-        KEEP(*(.isr_vector))
-        . = ALIGN(4);
-    } >FLASH
-
-    /* Program code and constant data */
-    .text :
-    {
-        . = ALIGN(4);
-        *(.text)
-        *(.text*)
-        *(.rodata)
-        *(.rodata*)
-        KEEP (*(.init))
-        KEEP (*(.fini))
-        . = ALIGN(4);
-        _etext = .;
-    } >FLASH
-
-    /* Exception handling */
-    .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
-    .ARM : {
-        __exidx_start = .;
-        *(.ARM.exidx*)
-        __exidx_end = .;
-    } >FLASH
-
-    /* Static constructor initialization (C++) */
-    .preinit_array :
-    {
-        PROVIDE_HIDDEN (__preinit_array_start = .);
-        KEEP (*(.preinit_array*))
-        PROVIDE_HIDDEN (__preinit_array_end = .);
-    } >FLASH
-    .init_array :
-    {
-        PROVIDE_HIDDEN (__init_array_start = .);
-        KEEP (*(SORT(.init_array.*)))
-        KEEP (*(.init_array*))
-        PROVIDE_HIDDEN (__init_array_end = .);
-    } >FLASH
-    .fini_array :
-    {
-        PROVIDE_HIDDEN (__fini_array_start = .);
-        KEEP (*(SORT(.fini_array.*)))
-        KEEP (*(.fini_array*))
-        PROVIDE_HIDDEN (__fini_array_end = .);
-    } >FLASH
-
-
-    /* Initialized data, needs to be handled by startup code */
-    _sidata = .;
-    .data : AT (_sidata)
-    {
-        . = ALIGN(4);
-        _sdata = . ;
-        _data = . ;
-        *(.data)
-        *(.data*)
-        *(.RAMtext)
-        . = ALIGN(4);
-        _edata = . ;
-    } >RAM
-
-    /* Uninitialized data */
-    .bss (NOLOAD) :
-    {
-        . = ALIGN(4);
-        _sbss = .;
-        __bss_start__ = .;
-        _bss = .;
-        *(.bss)
-        *(.bss*)
-        *(COMMON)
-        . = ALIGN(4);
-        _ebss = .;
-        __bss_end__ = _ebss;
-    } >RAM
-
-    /* Pointers to end of data for dynamic memory management */
-    PROVIDE (end = _ebss);
-    PROVIDE (_end = _ebss);
-
-    /* Remove debugging from standard libraries */
-    /DISCARD/ :
-    {
-        libc.a (*)
-        libm.a (*)
-        libgcc.a (*)
-    }
-}
diff --git a/src/stm32f0/stm32f0xx_hal_conf.h b/src/stm32f0/stm32f0xx_hal_conf.h
deleted file mode 100644
index 5457b8a1..00000000
--- a/src/stm32f0/stm32f0xx_hal_conf.h
+++ /dev/null
@@ -1,336 +0,0 @@
-/**
-******************************************************************************
-* @file    stm32f0xx_hal_conf.h
-* @brief   HAL configuration file.
-******************************************************************************
-* @attention
-*
-* <h2><center>&copy; COPYRIGHT(c) 2019 STMicroelectronics</center></h2>
-*
-*Redistribution in source and binary forms, with or without modification,
-* are permitted provided that the following conditions are met:
-*   1. Redistributions of source code must retain the above copyright notice,
-*      this list of conditions and the following disclaimer.
-*  2. Redistributions in binary form must reproduce the above copyright notice,
-*     this list of conditions and the following disclaimer in the documentation
-*      and/or other materials provided with the distribution.
-*  3. Neither the name of STMicroelectronics nor the names of its contributors
-*      may be used to endorse or promote products derived from this software
-*      without specific prior written permission.
-*
-* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-*IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*
-******************************************************************************
-*/
-
-/* Define to prevent recursive inclusion -----------------------------------*/
-#ifndef __STM32F0xx_HAL_CONF_H
-#define __STM32F0xx_HAL_CONF_H
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/* Exported types ----------------------------------------------------------*/
-/* Exported constants ------------------------------------------------------*/
-
-/* ########################## Module Selection ############################ */
-/**
-  * @brief This is the list of modules to be used in the HAL driver
-  */
-#define HAL_MODULE_ENABLED
-#define HAL_ADC_MODULE_ENABLED
-/*#define HAL_CRYP_MODULE_ENABLED   */
-#define HAL_CAN_MODULE_ENABLED
-/*#define HAL_CEC_MODULE_ENABLED   */
-/*#define HAL_COMP_MODULE_ENABLED   */
-/*#define HAL_CRC_MODULE_ENABLED   */
-/*#define HAL_CRYP_MODULE_ENABLED   */
-/*#define HAL_TSC_MODULE_ENABLED   */
-/*#define HAL_DAC_MODULE_ENABLED   */
-/*#define HAL_I2S_MODULE_ENABLED   */
-#define HAL_IWDG_MODULE_ENABLED
-/*#define HAL_LCD_MODULE_ENABLED   */
-/*#define HAL_LPTIM_MODULE_ENABLED   */
-/*#define HAL_RNG_MODULE_ENABLED   */
-/*#define HAL_RTC_MODULE_ENABLED   */
-#define HAL_SPI_MODULE_ENABLED
-#define HAL_TIM_MODULE_ENABLED
-#define HAL_UART_MODULE_ENABLED
-/*#define HAL_USART_MODULE_ENABLED   */
-/*#define HAL_IRDA_MODULE_ENABLED   */
-/*#define HAL_SMARTCARD_MODULE_ENABLED   */
-/*#define HAL_SMBUS_MODULE_ENABLED   */
-/*#define HAL_WWDG_MODULE_ENABLED   */
-/*#define HAL_PCD_MODULE_ENABLED   */
-/*#define HAL_EXTI_MODULE_ENABLED   */
-#define HAL_CORTEX_MODULE_ENABLED
-#define HAL_DMA_MODULE_ENABLED
-#define HAL_FLASH_MODULE_ENABLED
-#define HAL_GPIO_MODULE_ENABLED
-#define HAL_PWR_MODULE_ENABLED
-#define HAL_RCC_MODULE_ENABLED
-#define HAL_I2C_MODULE_ENABLED
-
-/* ########################## HSE/HSI Values adaptation ################### */
-/**
-* @brief Adjust the value of External High Speed oscillator (HSE) used\
-*     in your application.
-*     This value is used by the RCC HAL module to compute the system frequency
-*     (when HSE is used as system clock source, directly or through the PLL).
-  */
-#if !defined  (HSE_VALUE)
- /*!< Value of the External oscillator in Hz */
-  #define HSE_VALUE  ((uint32_t)8000000)
-#endif /* HSE_VALUE */
-
-/**
-  * @brief In the following line adjust the External High Speed oscillator\
-  *  (HSE) Startup
-  *        Timeout value
-  */
-#if !defined  (HSE_STARTUP_TIMEOUT)
- /*!< Time out for HSE start up, in ms */
-  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100)
-#endif /* HSE_STARTUP_TIMEOUT */
-
-/**
-  * @brief Internal High Speed oscillator (HSI) value.
-  *   This value is used by the RCC HAL module to compute the system frequency
-  *   (when HSI is used as system clock source, directly or through the PLL).
-  */
-#if !defined  (HSI_VALUE)
- /*!< Value of the Internal oscillator in Hz*/
-  #define HSI_VALUE    ((uint32_t)8000000)
-#endif /* HSI_VALUE */
-
-/**
-  * @brief In the following line adjust the Internal High Speed oscillator \
-  * (HSI) Startup
-  *        Timeout value
-  */
-#if !defined  (HSI_STARTUP_TIMEOUT)
- #define HSI_STARTUP_TIMEOUT ((uint32_t)5000) /*!< Time out for HSI startup */
-#endif /* HSI_STARTUP_TIMEOUT */
-
-/**
-  * @brief Internal High Speed oscillator for ADC (HSI14) value.
-  */
-#if !defined  (HSI14_VALUE)
-#define HSI14_VALUE ((uint32_t)14000000)
- /*!< Value of the Internal High Speed oscillator for ADC in Hz.
- The real value may vary depending on the variations
- in voltage and temperature.  */
-#endif /* HSI14_VALUE */
-
-/**
-  * @brief Internal High Speed oscillator for USB (HSI48) value.
-  */
-#if !defined  (HSI48_VALUE)
-#define HSI48_VALUE ((uint32_t)48000000)
- /*!< Value of the Internal High Speed oscillator for USB in Hz.
- The real value may vary depending on the variations
- in voltage and temperature.  */
-#endif /* HSI48_VALUE */
-
-/**
-  * @brief Internal Low Speed oscillator (LSI) value.
-  */
-#if !defined  (LSI_VALUE)
- #define LSI_VALUE  ((uint32_t)40000)
-#endif /* LSI_VALUE */
- /*!< Value of the Internal Low Speed oscillator in Hz
-  The real value may vary depending on the variations
-  in voltage and temperature.  */
-/**
-  * @brief External Low Speed oscillator (LSI) value.
-  */
-#if !defined  (LSE_VALUE)
- /*!< Value of the External Low Speed oscillator in Hz */
- #define LSE_VALUE  ((uint32_t)32768)
-#endif /* LSE_VALUE */
-
-#if !defined  (LSE_STARTUP_TIMEOUT)
-  /*!< Time out for LSE start up, in ms */
-  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000)
-#endif /* LSE_STARTUP_TIMEOUT */
-
-/* Tip: To avoid modifying this file each time you need to use different HSE,
-     you can define the HSE value in your toolchain compiler preprocessor. */
-
-/* ######################### System Configuration ######################### */
-/**
-  * @brief This is the HAL system configuration section
-  */
-#define  VDD_VALUE                 ((uint32_t)3300) /*!< Value of VDD in mv */
-/*!< tick interrupt priority (lowest by default)  */
-#define  TICK_INT_PRIORITY            ((uint32_t)0)
-              /*  Warning: Must be set to higher priority for HAL_Delay()  */
-              /*  and HAL_GetTick() usage under interrupt context          */
-#define  USE_RTOS                     0
-#define  PREFETCH_ENABLE              1
-#define  INSTRUCTION_CACHE_ENABLE     0
-#define  DATA_CACHE_ENABLE            0
-/* ########################## Assert Selection ############################# */
-/**
-  * @brief Uncomment the line below to expanse the "assert_param" macro in the
-  *        HAL drivers code
-  */
-/* #define USE_FULL_ASSERT   1U */
-
-/* ################## SPI peripheral configuration ######################### */
-
-/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
-* Activated: CRC code is present inside driver
-* Deactivated: CRC code cleaned from driver
-*/
-
-#define USE_SPI_CRC                     0U
-
-/* Includes -----------------------------------------------------------------*/
-/**
-  * @brief Include module's header file
-  */
-
-#ifdef HAL_RCC_MODULE_ENABLED
- #include "stm32f0xx_hal_rcc.h"
-#endif /* HAL_RCC_MODULE_ENABLED */
-
-#ifdef HAL_EXTI_MODULE_ENABLED
- #include "stm32f0xx_hal_exti.h"
-#endif /* HAL_EXTI_MODULE_ENABLED */
-
-#ifdef HAL_GPIO_MODULE_ENABLED
- #include "stm32f0xx_hal_gpio.h"
-#endif /* HAL_GPIO_MODULE_ENABLED */
-
-#ifdef HAL_DMA_MODULE_ENABLED
-  #include "stm32f0xx_hal_dma.h"
-#endif /* HAL_DMA_MODULE_ENABLED */
-
-#ifdef HAL_CORTEX_MODULE_ENABLED
- #include "stm32f0xx_hal_cortex.h"
-#endif /* HAL_CORTEX_MODULE_ENABLED */
-
-#ifdef HAL_ADC_MODULE_ENABLED
- #include "stm32f0xx_hal_adc.h"
-#endif /* HAL_ADC_MODULE_ENABLED */
-
-#ifdef HAL_CAN_MODULE_ENABLED
- #include "stm32f0xx_hal_can.h"
-#endif /* HAL_CAN_MODULE_ENABLED */
-
-#ifdef HAL_CEC_MODULE_ENABLED
- #include "stm32f0xx_hal_cec.h"
-#endif /* HAL_CEC_MODULE_ENABLED */
-
-#ifdef HAL_COMP_MODULE_ENABLED
- #include "stm32f0xx_hal_comp.h"
-#endif /* HAL_COMP_MODULE_ENABLED */
-
-#ifdef HAL_CRC_MODULE_ENABLED
- #include "stm32f0xx_hal_crc.h"
-#endif /* HAL_CRC_MODULE_ENABLED */
-
-#ifdef HAL_DAC_MODULE_ENABLED
- #include "stm32f0xx_hal_dac.h"
-#endif /* HAL_DAC_MODULE_ENABLED */
-
-#ifdef HAL_FLASH_MODULE_ENABLED
- #include "stm32f0xx_hal_flash.h"
-#endif /* HAL_FLASH_MODULE_ENABLED */
-
-#ifdef HAL_I2C_MODULE_ENABLED
- #include "stm32f0xx_hal_i2c.h"
-#endif /* HAL_I2C_MODULE_ENABLED */
-
-#ifdef HAL_I2S_MODULE_ENABLED
- #include "stm32f0xx_hal_i2s.h"
-#endif /* HAL_I2S_MODULE_ENABLED */
-
-#ifdef HAL_IRDA_MODULE_ENABLED
- #include "stm32f0xx_hal_irda.h"
-#endif /* HAL_IRDA_MODULE_ENABLED */
-
-#ifdef HAL_IWDG_MODULE_ENABLED
- #include "stm32f0xx_hal_iwdg.h"
-#endif /* HAL_IWDG_MODULE_ENABLED */
-
-#ifdef HAL_PCD_MODULE_ENABLED
- #include "stm32f0xx_hal_pcd.h"
-#endif /* HAL_PCD_MODULE_ENABLED */
-
-#ifdef HAL_PWR_MODULE_ENABLED
- #include "stm32f0xx_hal_pwr.h"
-#endif /* HAL_PWR_MODULE_ENABLED */
-
-#ifdef HAL_RTC_MODULE_ENABLED
- #include "stm32f0xx_hal_rtc.h"
-#endif /* HAL_RTC_MODULE_ENABLED */
-
-#ifdef HAL_SMARTCARD_MODULE_ENABLED
- #include "stm32f0xx_hal_smartcard.h"
-#endif /* HAL_SMARTCARD_MODULE_ENABLED */
-
-#ifdef HAL_SMBUS_MODULE_ENABLED
- #include "stm32f0xx_hal_smbus.h"
-#endif /* HAL_SMBUS_MODULE_ENABLED */
-
-#ifdef HAL_SPI_MODULE_ENABLED
- #include "stm32f0xx_hal_spi.h"
-#endif /* HAL_SPI_MODULE_ENABLED */
-
-#ifdef HAL_TIM_MODULE_ENABLED
- #include "stm32f0xx_hal_tim.h"
-#endif /* HAL_TIM_MODULE_ENABLED */
-
-#ifdef HAL_TSC_MODULE_ENABLED
- #include "stm32f0xx_hal_tsc.h"
-#endif /* HAL_TSC_MODULE_ENABLED */
-
-#ifdef HAL_UART_MODULE_ENABLED
- #include "stm32f0xx_hal_uart.h"
-#endif /* HAL_UART_MODULE_ENABLED */
-
-#ifdef HAL_USART_MODULE_ENABLED
- #include "stm32f0xx_hal_usart.h"
-#endif /* HAL_USART_MODULE_ENABLED */
-
-#ifdef HAL_WWDG_MODULE_ENABLED
- #include "stm32f0xx_hal_wwdg.h"
-#endif /* HAL_WWDG_MODULE_ENABLED */
-
-/* Exported macro -----------------------------------------------------------*/
-#ifdef  USE_FULL_ASSERT
-/**
-  * @brief  The assert_param macro is used for function's parameters check.
-  * @param  expr: If expr is false, it calls assert_failed function
-  *         which reports the name of the source file and the source
-  *         line number of the call that failed.
-  *         If expr is true, it returns no value.
-  * @retval None
-  */
-  #define assert_param(expr) \
-  ((expr) ? (void)0U : assert_failed((char *)__FILE__, __LINE__))
-/* Exported functions ------------------------------------------------------ */
-  void assert_failed(char* file, uint32_t line);
-#else
-  #define assert_param(expr) ((void)0U)
-#endif /* USE_FULL_ASSERT */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __STM32F0xx_HAL_CONF_H */
-
-/********************** (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/src/stm32f0/timer.c b/src/stm32f0/timer.c
deleted file mode 100644
index 0b285d4e..00000000
--- a/src/stm32f0/timer.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * Timer and PWM functions for STM32F042 boards.
- * Also replacement for 'generic/armcm_timer.c', which not compatible
- * with Cortex-M0 CPUs
- *
- *  Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
- *  This file may be distributed under the terms of the GNU GPLv3 license.
- *
- *  DO NOT USE HAL! (Timer HAL extremely fat)
- */
-
-#include "autoconf.h" // CONFIG_CLOCK_FREQ
-#include "board/internal.h" // SysTick
-#include "board/irq.h" // irq_disable
-#include "stm32f0xx.h"
-#include "log.h"
-#include "sched.h" // DECL_INIT
-#include "command.h" // shutdown
-#include "board/timer_irq.h" // timer_dispatch_many
-
-// Set the next irq time
-static void
-timer_set_diff(uint32_t value)
-{
-    SysTick->LOAD = value & SysTick_LOAD_RELOAD_Msk;
-    SysTick->VAL = 0;
-    SysTick->LOAD = 0;
-}
-
-// Activate timer dispatch as soon as possible
-void
-timer_kick(void)
-{
-    SysTick->LOAD = 0;
-    SysTick->VAL = 0;
-    SCB->ICSR = SCB_ICSR_PENDSTSET_Msk;
-}
-
-/*
- * TIM2 (32bit) used instead of DWT->CYCCNT in original variant
- */
-void TimerInit(void)
-{
-    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
-
-    TIM2->PSC = 0;
-    //TIM2->ARR = 0xFFFFFFFF; reset value
-    TIM2->DIER = TIM_DIER_UIE;
-    TIM2->CR1 = TIM_CR1_CEN;
-
-    NVIC_EnableIRQ(TIM2_IRQn);
-
-    // Enable SysTick
-    irqstatus_t flag = irq_save();
-    NVIC_SetPriority(SysTick_IRQn, 2);
-    SysTick->CTRL = (SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk
-                     | SysTick_CTRL_ENABLE_Msk);
-    timer_kick();
-    irq_restore(flag);
-
-}
-DECL_INIT(TimerInit);
-
-uint32_t
-timer_read_time(void)
-{
-    return TIM2->CNT;
-}
-
-// IRQ handler
-void __visible __aligned(16) // aligning helps stabilize perf benchmarks
-SysTick_Handler(void)
-{
-    irq_disable();
-    uint32_t next = timer_dispatch_many();
-    timer_set_diff(next-timer_read_time());
-    irq_enable();
-}
-
-void TIM2_IRQHandler(void)
-{
-    if(TIM2->SR & TIM_SR_UIF) {
-        TIM2->SR &= ~TIM_SR_UIF; // clear UIF flag
-    }
-}