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// GPIO functions on STM32F1
//
// Copyright (C) 2018 Grigori Goronzy <greg@kinoho.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint32_t
#include <stdbool.h>
#include "autoconf.h" // CONFIG_CLOCK_FREQ
#include "command.h" // shutdown
#include "compiler.h" // ARRAY_SIZE
#include "gpio.h" // gpio_out_setup
#include "stm32f1xx.h"
#include "stm32f1xx_ll_gpio.h"
#include "stm32f1xx_ll_adc.h"
#include "sched.h" // sched_shutdown
#include "board/irq.h"
#include "board/io.h"
/****************************************************************
* Pin mappings
****************************************************************/
#define GPIO(PORT, NUM) (((PORT)-'A') * 16 + (NUM))
#define GPIO2PORT(PIN) ((PIN) / 16)
static GPIO_TypeDef *const digital_regs[] = {
GPIOA, GPIOB, GPIOC, GPIOD, GPIOE
};
static uint32_t const digital_pins[] = {
LL_GPIO_PIN_0,
LL_GPIO_PIN_1,
LL_GPIO_PIN_2,
LL_GPIO_PIN_3,
LL_GPIO_PIN_4,
LL_GPIO_PIN_5,
LL_GPIO_PIN_6,
LL_GPIO_PIN_7,
LL_GPIO_PIN_8,
LL_GPIO_PIN_9,
LL_GPIO_PIN_10,
LL_GPIO_PIN_11,
LL_GPIO_PIN_12,
LL_GPIO_PIN_13,
LL_GPIO_PIN_14,
LL_GPIO_PIN_15,
};
/****************************************************************
* General Purpose Input Output (GPIO) pins
****************************************************************/
struct gpio_out
gpio_out_setup(uint8_t pin, uint8_t val)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
uint32_t bit = digital_pins[pin % 16];
irqstatus_t flag = irq_save();
if (val)
LL_GPIO_SetOutputPin(regs, bit);
else
LL_GPIO_ResetOutputPin(regs, bit);
LL_GPIO_SetPinMode(regs, bit, LL_GPIO_MODE_OUTPUT);
irq_restore(flag);
return (struct gpio_out){ .regs = regs, .bit = bit };
fail:
shutdown("Not an output pin");
}
void
gpio_out_toggle_noirq(struct gpio_out g)
{
LL_GPIO_TogglePin(g.regs, g.bit);
}
void
gpio_out_toggle(struct gpio_out g)
{
irqstatus_t flag = irq_save();
gpio_out_toggle_noirq(g);
irq_restore(flag);
}
void
gpio_out_write(struct gpio_out g, uint8_t val)
{
if (val)
LL_GPIO_SetOutputPin(g.regs, g.bit);
else
LL_GPIO_ResetOutputPin(g.regs, g.bit);
}
struct gpio_in
gpio_in_setup(uint8_t pin, int8_t pull_up)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
uint32_t bit = digital_pins[pin % 16];
irqstatus_t flag = irq_save();
if (pull_up) {
LL_GPIO_SetPinMode(regs, bit, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(regs, bit, LL_GPIO_PULL_UP);
} else {
LL_GPIO_SetPinMode(regs, bit, LL_GPIO_MODE_FLOATING);
}
irq_restore(flag);
return (struct gpio_in){ .regs = regs, .bit = bit };
fail:
shutdown("Not an input pin");
}
uint8_t
gpio_in_read(struct gpio_in g)
{
return LL_GPIO_IsInputPinSet(g.regs, g.bit);
}
/****************************************************************
* Analog to Digital Converter (ADC) pins
****************************************************************/
DECL_CONSTANT(ADC_MAX, 4095);
#define ADC_DELAY (240 * 8)
static bool adc_busy;
static uint32_t adc_current_channel;
static const uint8_t adc_pins[] = {
GPIO('A', 0), GPIO('A', 1), GPIO('A', 2), GPIO('A', 3),
GPIO('A', 4), GPIO('A', 5), GPIO('A', 6), GPIO('A', 7),
GPIO('B', 0), GPIO('B', 1), GPIO('C', 0), GPIO('C', 1),
GPIO('C', 2), GPIO('C', 3)
};
static const uint32_t adc_channels[] = {
LL_ADC_CHANNEL_0,
LL_ADC_CHANNEL_1,
LL_ADC_CHANNEL_2,
LL_ADC_CHANNEL_3,
LL_ADC_CHANNEL_4,
LL_ADC_CHANNEL_5,
LL_ADC_CHANNEL_6,
LL_ADC_CHANNEL_7,
LL_ADC_CHANNEL_8,
LL_ADC_CHANNEL_9,
LL_ADC_CHANNEL_10,
LL_ADC_CHANNEL_11,
LL_ADC_CHANNEL_12,
LL_ADC_CHANNEL_13,
LL_ADC_CHANNEL_14,
LL_ADC_CHANNEL_15,
};
struct gpio_adc
gpio_adc_setup(uint8_t pin)
{
// Find pin in adc_pins table
int chan;
for (chan=0; ; chan++) {
if (chan >= ARRAY_SIZE(adc_pins))
shutdown("Not a valid ADC pin");
if (adc_pins[chan] == pin)
break;
}
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
uint32_t bit = digital_pins[pin % 16];
LL_GPIO_SetPinMode(regs, bit, LL_GPIO_MODE_ANALOG);
return (struct gpio_adc){ .bit = 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)) {
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, g.bit);
LL_ADC_SetChannelSamplingTime(ADC1, g.bit, LL_ADC_SAMPLINGTIME_239CYCLES_5);
LL_ADC_REG_StartConversionSWStart(ADC1);
adc_busy = true;
adc_current_channel = g.bit;
return ADC_DELAY;
/* ADC finished conversion for this channel */
} else if (LL_ADC_IsActiveFlag_EOS(ADC1) &&
readl(&adc_current_channel) == g.bit) {
LL_ADC_ClearFlag_EOS(ADC1);
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 LL_ADC_REG_ReadConversionData12(ADC1);
}
// 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.bit) {
adc_busy = false;
LL_ADC_ClearFlag_EOS(ADC1);
}
}
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