diff options
Diffstat (limited to 'src/stm32f1/usbserial.c')
| -rw-r--r-- | src/stm32f1/usbserial.c | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/src/stm32f1/usbserial.c b/src/stm32f1/usbserial.c deleted file mode 100644 index 3bdf86a8..00000000 --- a/src/stm32f1/usbserial.c +++ /dev/null @@ -1,305 +0,0 @@ -// Hardware interface to "fullspeed USB controller" on stm32f1 -// -// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net> -// -// This file may be distributed under the terms of the GNU GPLv3 license. - -#include <string.h> // NULL -#include "autoconf.h" // CONFIG_STM_FLASH_START_2000 -#include "board/armcm_timer.h" // udelay -#include "board/gpio.h" // gpio_out_setup -#include "board/io.h" // writeb -#include "board/irq.h" // irq_disable -#include "board/usb_cdc.h" // usb_notify_ep0 -#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN -#include "internal.h" // GPIO -#include "sched.h" // DECL_INIT -#include "stm32f1xx.h" // USB - - -/**************************************************************** - * USB transfer memory - ****************************************************************/ - -struct ep_desc { - uint32_t addr_tx, count_tx, addr_rx, count_rx; -}; - -struct ep_mem { - struct ep_desc ep0, ep_acm, ep_bulk_out, ep_bulk_in; - uint32_t ep0_tx[USB_CDC_EP0_SIZE / 2]; - uint32_t ep0_rx[USB_CDC_EP0_SIZE / 2]; - uint32_t ep_acm_tx[USB_CDC_EP_ACM_SIZE / 2]; - uint32_t ep_bulk_out_rx[USB_CDC_EP_BULK_OUT_SIZE / 2]; - uint32_t ep_bulk_in_tx[USB_CDC_EP_BULK_IN_SIZE / 2]; -}; - -#define USB_BTABLE ((struct ep_mem *)(USB_BASE + 0x400)) - -#define CALC_ADDR(p) (((void*)(p) - (void*)USB_BTABLE) / 2) -#define CALC_SIZE(s) ((s) > 32 ? (DIV_ROUND_UP((s), 32) << 10) | 0x8000 \ - : DIV_ROUND_UP((s), 2) << 10) - -// Setup the transfer descriptors in dedicated usb memory -static void -btable_configure(void) -{ - USB_BTABLE->ep0.count_tx = 0; - USB_BTABLE->ep0.addr_tx = CALC_ADDR(USB_BTABLE->ep0_tx); - USB_BTABLE->ep0.count_rx = CALC_SIZE(USB_CDC_EP0_SIZE); - USB_BTABLE->ep0.addr_rx = CALC_ADDR(USB_BTABLE->ep0_rx); - - USB_BTABLE->ep_acm.count_tx = 0; - USB_BTABLE->ep_acm.addr_tx = CALC_ADDR(USB_BTABLE->ep_acm_tx); - - USB_BTABLE->ep_bulk_out.count_rx = CALC_SIZE(USB_CDC_EP_BULK_OUT_SIZE); - USB_BTABLE->ep_bulk_out.addr_rx = CALC_ADDR(USB_BTABLE->ep_bulk_out_rx); - - USB_BTABLE->ep_bulk_in.count_tx = 0; - USB_BTABLE->ep_bulk_in.addr_tx = CALC_ADDR(USB_BTABLE->ep_bulk_in_tx); -} - -// Read a packet stored in dedicated usb memory -static void -btable_read_packet(uint8_t *dest, uint32_t *src, int count) -{ - uint_fast8_t i; - for (i=0; i<(count/2); i++) { - uint32_t d = *src++; - *dest++ = d; - *dest++ = d >> 8; - } - if (count & 1) - *dest = *src; -} - -// Write a packet to dedicated usb memory -static void -btable_write_packet(uint32_t *dest, const uint8_t *src, int count) -{ - int i; - for (i=0; i<(count/2); i++) { - uint8_t b1 = *src++, b2 = *src++; - *dest++ = b1 | (b2 << 8); - } - if (count & 1) - *dest = *src; -} - - -/**************************************************************** - * USB endpoint register - ****************************************************************/ - -#define USB_EPR ((volatile uint32_t *)USB_BASE) - -#define EP_BULK (0 << USB_EP0R_EP_TYPE_Pos) -#define EP_CONTROL (1 << USB_EP0R_EP_TYPE_Pos) -#define EP_INTERRUPT (3 << USB_EP0R_EP_TYPE_Pos) -#define RX_STALL (1 << USB_EP0R_STAT_RX_Pos) -#define RX_NAK (2 << USB_EP0R_STAT_RX_Pos) -#define RX_VALID (3 << USB_EP0R_STAT_RX_Pos) -#define TX_STALL (1 << USB_EP0R_STAT_TX_Pos) -#define TX_NAK (2 << USB_EP0R_STAT_TX_Pos) -#define TX_VALID (3 << USB_EP0R_STAT_TX_Pos) -#define EPR_RWBITS (USB_EP0R_EA | USB_EP0R_EP_KIND | USB_EP0R_EP_TYPE) -#define EPR_RWCBITS (USB_EP0R_CTR_RX | USB_EP0R_CTR_TX) - -static uint32_t -set_stat_rx_bits(uint32_t epr, uint32_t bits) -{ - return ((epr & (EPR_RWBITS | USB_EP0R_STAT_RX_Msk)) ^ bits) | EPR_RWCBITS; -} - -static uint32_t -set_stat_tx_bits(uint32_t epr, uint32_t bits) -{ - return ((epr & (EPR_RWBITS | USB_EP0R_STAT_TX_Msk)) ^ bits) | EPR_RWCBITS; -} - -static uint32_t -set_stat_rxtx_bits(uint32_t epr, uint32_t bits) -{ - uint32_t mask = EPR_RWBITS | USB_EP0R_STAT_RX_Msk | USB_EP0R_STAT_TX_Msk; - return ((epr & mask) ^ bits) | EPR_RWCBITS; -} - - -/**************************************************************** - * USB interface - ****************************************************************/ - -int_fast8_t -usb_read_bulk_out(void *data, uint_fast8_t max_len) -{ - uint32_t epr = USB_EPR[USB_CDC_EP_BULK_OUT]; - if ((epr & USB_EP0R_STAT_RX_Msk) == RX_VALID) - // No data ready - return -1; - uint32_t count = USB_BTABLE->ep_bulk_out.count_rx & 0x3ff; - if (count > max_len) - count = max_len; - btable_read_packet(data, USB_BTABLE->ep_bulk_out_rx, count); - USB_EPR[USB_CDC_EP_BULK_OUT] = set_stat_rx_bits(epr, RX_VALID); - return count; -} - -int_fast8_t -usb_send_bulk_in(void *data, uint_fast8_t len) -{ - uint32_t epr = USB_EPR[USB_CDC_EP_BULK_IN]; - if ((epr & USB_EP0R_STAT_TX_Msk) != TX_NAK) - // No buffer space available - return -1; - btable_write_packet(USB_BTABLE->ep_bulk_in_tx, data, len); - USB_BTABLE->ep_bulk_in.count_tx = len; - USB_EPR[USB_CDC_EP_BULK_IN] = set_stat_tx_bits(epr, TX_VALID); - return len; -} - -int_fast8_t -usb_read_ep0(void *data, uint_fast8_t max_len) -{ - uint32_t epr = USB_EPR[0]; - if ((epr & USB_EP0R_STAT_RX_Msk) != RX_NAK) - // No data ready - return -1; - uint32_t count = USB_BTABLE->ep0.count_rx & 0x3ff; - if (count > max_len) - count = max_len; - btable_read_packet(data, USB_BTABLE->ep0_rx, count); - USB_EPR[0] = set_stat_rxtx_bits(epr, RX_VALID | TX_NAK); - return count; -} - -int_fast8_t -usb_read_ep0_setup(void *data, uint_fast8_t max_len) -{ - return usb_read_ep0(data, max_len); -} - -int_fast8_t -usb_send_ep0(const void *data, uint_fast8_t len) -{ - uint32_t epr = USB_EPR[0]; - if ((epr & USB_EP0R_STAT_RX_Msk) != RX_VALID) - // Transfer interrupted - return -2; - if ((epr & USB_EP0R_STAT_TX_Msk) != TX_NAK) - // No buffer space available - return -1; - btable_write_packet(USB_BTABLE->ep0_tx, data, len); - USB_BTABLE->ep0.count_tx = len; - USB_EPR[0] = set_stat_tx_bits(epr, TX_VALID); - return len; -} - -void -usb_stall_ep0(void) -{ - USB_EPR[0] = set_stat_rxtx_bits(USB_EPR[0], RX_STALL | TX_STALL); -} - -static uint8_t set_address; - -void -usb_set_address(uint_fast8_t addr) -{ - writeb(&set_address, addr | USB_DADDR_EF); - usb_send_ep0(NULL, 0); -} - -void -usb_set_configure(void) -{ -} - -void -usb_request_bootloader(void) -{ - if (!CONFIG_STM_FLASH_START_2000) - return; - // Enter "stm32duino" bootloader - irq_disable(); - RCC->APB1ENR |= RCC_APB1ENR_PWREN | RCC_APB1ENR_BKPEN; - PWR->CR |= PWR_CR_DBP; - BKP->DR10 = 0x01; - PWR->CR &=~ PWR_CR_DBP; - NVIC_SystemReset(); -} - - -/**************************************************************** - * Setup and interrupts - ****************************************************************/ - -// Initialize the usb controller -void -usb_init(void) -{ - // Pull the D+ pin low briefly to signal a new connection - gpio_out_setup(GPIO('A', 12), 0); - udelay(5000); - gpio_in_setup(GPIO('A', 12), 0); - - // Setup USB packet memory - btable_configure(); - - // Enable USB clock - RCC->APB1ENR |= RCC_APB1ENR_USBEN; - - // Reset usb controller and enable interrupts - USB->CNTR = USB_CNTR_FRES; - USB->BTABLE = 0; - USB->DADDR = 0; - USB->CNTR = USB_CNTR_RESETM; - USB->ISTR = 0; - NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 1); - NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn); -} -DECL_INIT(usb_init); - -// Configure interface after a USB reset event -static void -usb_reset(void) -{ - USB_EPR[0] = 0 | EP_CONTROL | RX_VALID | TX_NAK; - USB_EPR[USB_CDC_EP_ACM] = USB_CDC_EP_ACM | EP_INTERRUPT | RX_NAK | TX_NAK; - USB_EPR[USB_CDC_EP_BULK_OUT] = (USB_CDC_EP_BULK_OUT | EP_BULK - | RX_VALID | TX_NAK); - USB_EPR[USB_CDC_EP_BULK_IN] = (USB_CDC_EP_BULK_IN | EP_BULK - | RX_NAK | TX_NAK); - - USB->CNTR = USB_CNTR_CTRM | USB_CNTR_RESETM; - USB->DADDR = USB_DADDR_EF; -} - -// Main irq handler -void __visible -USB_LP_CAN1_RX0_IRQHandler(void) -{ - uint32_t istr = USB->ISTR; - if (istr & USB_ISTR_CTR) { - // Endpoint activity - uint32_t ep = istr & USB_ISTR_EP_ID; - uint32_t epr = USB_EPR[ep]; - USB_EPR[ep] = epr & EPR_RWBITS; - if (ep == 0) { - usb_notify_ep0(); - if (epr & USB_EP_CTR_TX && set_address) { - // Apply address after last "in" message transmitted - USB->DADDR = set_address; - set_address = 0; - } - } else if (ep == USB_CDC_EP_BULK_OUT) { - usb_notify_bulk_out(); - } else if (ep == USB_CDC_EP_BULK_IN) { - usb_notify_bulk_in(); - } - } - if (istr & USB_ISTR_RESET) { - // USB Reset - USB->ISTR = (uint16_t)~USB_ISTR_RESET; - usb_reset(); - } -} |