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usb_io.c
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usb_io.c
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/*
* MIT License
*
* Copyright (c) 2020 Kirill Kotyagin
*/
#include <stm32f1xx.h>
#include "system_interrupts.h"
#include "status_led.h"
#include "usb_descriptors.h"
#include "usb_core.h"
#include "usb_panic.h"
#include "usb_io.h"
static volatile usb_btable_entity_t *usb_btable = (usb_btable_entity_t*)USB_PMAADDR;
/* USB Initialization After Reset */
void usb_io_reset() {
uint16_t offset = USB_BTABLE_SIZE;
for (uint8_t ep_num=0; ep_num<USB_NUM_ENDPOINTS; ep_num++) {
ep_reg_t ep_type = 0;
ep_reg_t *ep_reg = ep_regs(ep_num);
usb_btable[ep_num].tx_offset = offset;
usb_btable[ep_num].tx_count = 0;
offset += usb_endpoints[ep_num].tx_size;
usb_btable[ep_num].rx_offset = offset;
if (usb_endpoints[ep_num].rx_size > USB_BTABLE_SMALL_BLOCK_SIZE_LIMIT) {
usb_btable[ep_num].rx_count = ((usb_endpoints[ep_num].rx_size / USB_BTABLE_LARGE_BLOCK_SIZE) - 1) << USB_COUNT0_RX_NUM_BLOCK_Pos;
usb_btable[ep_num].rx_count |= USB_COUNT0_RX_BLSIZE;
} else {
usb_btable[ep_num].rx_count = (usb_endpoints[ep_num].rx_size / USB_BTABLE_SMALL_BLOCK_SIZE) << USB_COUNT0_RX_NUM_BLOCK_Pos;
}
offset += usb_endpoints[ep_num].rx_size;
switch(usb_endpoints[ep_num].type) {
case usb_endpoint_type_control:
ep_type = USB_EP_CONTROL;
break;
case usb_endpoint_type_isochronous:
ep_type = USB_EP_ISOCHRONOUS;
break;
case usb_endpoint_type_bulk:
ep_type = USB_EP_BULK;
break;
case usb_endpoint_type_interrupt:
ep_type = USB_EP_INTERRUPT;
break;
}
*ep_reg = USB_EP_RX_VALID | USB_EP_TX_NAK | ep_type | ep_num;
}
USB->CNTR = USB_CNTR_CTRM | USB_CNTR_RESETM | USB_CNTR_SUSPM | USB_CNTR_WKUPM | USB_CNTR_SOFM;
USB->DADDR = USB_DADDR_EF;
}
void usb_io_init() {
/* Force USB re-enumeration */
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
GPIOA->CRH &= ~GPIO_CRH_CNF12;
GPIOA->CRH |= GPIO_CRH_MODE12_1;
for (int i=0; i<0xFFFF; i++) {
__NOP();
}
GPIOA->CRH &= ~GPIO_CRH_MODE12;
GPIOA->CRH |= GPIO_CRH_CNF12_0;
/* Initialize USB */
NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
if (SystemCoreClock != RCC_MAX_FREQUENCY) {
RCC->CFGR |= RCC_CFGR_USBPRE;
}
RCC->APB1ENR |= RCC_APB1ENR_USBEN;
USB->CNTR = USB_CNTR_FRES;
USB->BTABLE = 0;
USB->DADDR = 0;
USB->ISTR = 0;
USB->CNTR = USB_CNTR_RESETM;
}
/* Get Number of RX/TX Bytes Available */
size_t usb_bytes_available(uint8_t ep_num) {
return usb_btable[ep_num].rx_count & USB_COUNT0_RX_COUNT0_RX;
}
size_t usb_space_available(uint8_t ep_num) {
ep_reg_t *ep_reg = ep_regs(ep_num);
size_t tx_space_available = 0;
if ((*ep_reg & USB_EPTX_STAT) == USB_EP_TX_NAK) {
tx_space_available = usb_endpoints[ep_num].tx_size;
}
return tx_space_available;
}
/* Endpoint Read/Write Operations */
int usb_read(uint8_t ep_num, void *buf, size_t buf_size) {
ep_reg_t *ep_reg = ep_regs(ep_num);
usb_pbuffer_data_t *ep_buf = (usb_pbuffer_data_t *)(USB_PMAADDR + (usb_btable[ep_num].rx_offset<<1));
pb_word_t ep_bytes_count = usb_btable[ep_num].rx_count & USB_COUNT0_RX_COUNT0_RX;
pb_word_t words_left = ep_bytes_count>>1;
pb_word_t *buf_p = (pb_word_t*)buf;
if (ep_bytes_count > buf_size) {
return -1;
}
usb_btable[ep_num].rx_count &= ~USB_COUNT0_RX_COUNT0_RX;
while(words_left--) {
*buf_p++ = (ep_buf++)->data;
}
if (ep_bytes_count & 0x01) {
*((uint8_t*)buf_p) = (uint8_t)ep_buf->data;
}
*ep_reg = ((*ep_reg ^ USB_EP_RX_VALID) & (USB_EPREG_MASK | USB_EPRX_STAT)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
return ep_bytes_count;
}
size_t usb_send(uint8_t ep_num, const void *buf, size_t count) {
ep_reg_t *ep_reg = ep_regs(ep_num);
usb_pbuffer_data_t *ep_buf = (usb_pbuffer_data_t *)(USB_PMAADDR + (usb_btable[ep_num].tx_offset<<1));
pb_word_t *buf_p = (pb_word_t*)buf;
pb_word_t words_left = count >> 1;
size_t tx_space_available = usb_endpoints[ep_num].tx_size;
if (count > tx_space_available) {
count = tx_space_available;
}
while (words_left--) {
(ep_buf++)->data = *buf_p++;
}
if (count & 0x01) {
(ep_buf)->data = (uint8_t)*buf_p;
}
usb_btable[ep_num].tx_count = count;
*ep_reg = ((*ep_reg ^ USB_EP_TX_VALID) & (USB_EPREG_MASK | USB_EPTX_STAT)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
return count;
}
/* Circular Buffer Read/Write Operations */
/* NOTE: usb_circ_buf_read assumes enough buffer space is available */
size_t usb_circ_buf_read(uint8_t ep_num, circ_buf_t *buf, size_t buf_size) {
ep_reg_t *ep_reg = ep_regs(ep_num);
usb_pbuffer_data_t *ep_buf = (usb_pbuffer_data_t *)(USB_PMAADDR + (usb_btable[ep_num].rx_offset<<1));
pb_word_t ep_bytes_count = usb_btable[ep_num].rx_count & USB_COUNT0_RX_COUNT0_RX;
size_t words_left = ep_bytes_count>>1;
usb_btable[ep_num].rx_count &= ~USB_COUNT0_RX_COUNT0_RX;
while(words_left--) {
buf->data[buf->head] = (uint8_t)(ep_buf->data);
buf->head = (buf->head + 1) & (buf_size - 1);
buf->data[buf->head] = (uint8_t)(((ep_buf++)->data) >> 8);
buf->head = (buf->head + 1) & (buf_size - 1);
}
if (ep_bytes_count & 0x1) {
buf->data[buf->head] = (uint8_t)(ep_buf->data);
buf->head = (buf->head + 1) & (buf_size - 1);
}
*ep_reg = ((*ep_reg ^ USB_EP_RX_VALID) & (USB_EPREG_MASK | USB_EPRX_STAT)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
return ep_bytes_count;
}
/* NOTE: usb_circ_buf_send assumes endpoint is ready to send */
size_t usb_circ_buf_send(uint8_t ep_num, circ_buf_t *buf, size_t buf_size) {
ep_reg_t *ep_reg = ep_regs(ep_num);
usb_pbuffer_data_t *ep_buf = (usb_pbuffer_data_t *)(USB_PMAADDR + (usb_btable[ep_num].tx_offset<<1));
size_t count = circ_buf_count(buf->head, buf->tail, buf_size);
size_t tx_space_available = usb_endpoints[ep_num].tx_size;
size_t words_left;
if (count > tx_space_available) {
count = tx_space_available;
}
words_left = count >> 1;
while (words_left--) {
pb_word_t pb_word = buf->data[buf->tail];
buf->tail = (buf->tail + 1) & (buf_size - 1);
pb_word |= ((uint16_t)buf->data[buf->tail]) << 8;
buf->tail = (buf->tail + 1) & (buf_size - 1);
(ep_buf++)->data = pb_word;
}
if (count & 0x1) {
(ep_buf)->data = buf->data[buf->tail];
buf->tail = (buf->tail + 1) & (buf_size - 1);
}
usb_btable[ep_num].tx_count = count;
*ep_reg = ((*ep_reg ^ USB_EP_TX_VALID) & (USB_EPREG_MASK | USB_EPTX_STAT)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
return count;
}
/* Endpoint Stall */
void usb_endpoint_set_stall(uint8_t ep_num, usb_endpoint_direction_t ep_direction, uint8_t ep_stall) {
ep_reg_t *ep_reg = ep_regs(ep_num);
if ((*ep_reg & USB_EP_T_FIELD) != USB_EP_ISOCHRONOUS) {
if (ep_direction == usb_endpoint_direction_in) {
if ((*ep_reg & USB_EPTX_STAT) != USB_EP_TX_DIS) {
if (ep_stall) {
*ep_reg = ((*ep_reg ^ USB_EP_TX_STALL) & (USB_EPREG_MASK | USB_EPTX_STAT)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
} else {
*ep_reg = ((*ep_reg ^ USB_EP_TX_NAK) & (USB_EPREG_MASK | USB_EPTX_STAT | USB_EP_DTOG_TX)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
}
}
} else {
if ((*ep_reg & USB_EPRX_STAT) != USB_EP_RX_DIS) {
if (ep_stall) {
*ep_reg = ((*ep_reg ^ USB_EP_RX_STALL) & (USB_EPREG_MASK | USB_EPRX_STAT)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
} else {
*ep_reg = ((*ep_reg ^ USB_EP_TX_VALID) & (USB_EPREG_MASK | USB_EPRX_STAT | USB_EP_DTOG_RX)) | (USB_EP_CTR_RX | USB_EP_CTR_TX);
}
}
}
}
}
int usb_endpoint_is_stalled(uint8_t ep_num, usb_endpoint_direction_t ep_direction) {
if (ep_direction == usb_endpoint_direction_in) {
return (*ep_regs(ep_num) & USB_EPTX_STAT) == USB_EP_TX_STALL;
}
return (*ep_regs(ep_num) & USB_EPRX_STAT) == USB_EP_RX_STALL;
}
/* USB Polling */
static uint8_t usb_transfer_led_timer = 0;
uint16_t istr;
void usb_poll() {
istr = USB->ISTR;
if (istr & USB_ISTR_CTR) {
uint8_t ep_num = USB->ISTR & USB_ISTR_EP_ID;
ep_reg_t *ep_reg = ep_regs(ep_num);
if (*ep_reg & USB_EP_CTR_TX) {
*ep_reg = ((*ep_reg & (USB_EP_T_FIELD | USB_EP_KIND | USB_EPADDR_FIELD)) | USB_EP_CTR_RX);
if (usb_endpoints[ep_num].event_handler) {
usb_endpoints[ep_num].event_handler(ep_num, usb_endpoint_event_data_sent);
}
} else {
usb_endpoint_event_t ep_event = usb_endpoint_event_data_received;
if (*ep_reg & USB_EP_SETUP) {
ep_event = usb_endpoint_event_setup;
}
*ep_reg = ((*ep_reg & (USB_EP_T_FIELD | USB_EP_KIND | USB_EPADDR_FIELD)) | USB_EP_CTR_TX);
if (usb_endpoints[ep_num].event_handler) {
usb_endpoints[ep_num].event_handler(ep_num, ep_event);
}
}
usb_transfer_led_timer = USB_TRANSFER_LED_TIME;
status_led_set(1);
} else if (istr & USB_ISTR_RESET) {
USB->ISTR = (uint16_t)(~USB_ISTR_RESET);
usb_device_handle_reset();
} else if (istr & USB_ISTR_SUSP) {
USB->ISTR = (uint16_t)(~USB_ISTR_SUSP);
USB->CNTR |= USB_CNTR_FSUSP;
status_led_set(0);
usb_device_handle_suspend();
} else if (istr & USB_ISTR_WKUP) {
USB->ISTR = (uint16_t)(~USB_ISTR_WKUP);
USB->CNTR &= ~USB_CNTR_FSUSP;
usb_device_handle_wakeup();
} else if (istr & USB_ISTR_SOF) {
USB->ISTR = (uint16_t)(~USB_ISTR_SOF);
if (usb_transfer_led_timer) {
status_led_set(--usb_transfer_led_timer);
}
usb_device_handle_frame();
}
}