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micropython/stmhal/usbd_cdc_interface.c
Damien George f357a19202 stmhal: Fix issues with USB CDC init and receive. 
Late USB enumeration could clear settings after they had been set.
Now fixed by not clearing some settings on init.

RX was blocking if received characters were not being processed, so
CTRL-C would not be picked up.  Now "fixed" by not blocking, but
instead discarding incoming characters if they overflow the buffer.
2014-03-23 18:54:48 +00:00

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/**
******************************************************************************
* @file USB_Device/CDC_Standalone/Src/usbd_cdc_interface.c
* @author MCD Application Team
* @version V1.0.1
* @date 26-February-2014
* @brief Source file for USBD CDC interface
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include <stdbool.h>
#include "stm32f4xx_hal.h"
#include "usbd_cdc_msc.h"
#include "usbd_cdc_interface.h"
#include "pendsv.h"
#include "usb.h"
// CDC control commands
#define CDC_SEND_ENCAPSULATED_COMMAND 0x00
#define CDC_GET_ENCAPSULATED_RESPONSE 0x01
#define CDC_SET_COMM_FEATURE 0x02
#define CDC_GET_COMM_FEATURE 0x03
#define CDC_CLEAR_COMM_FEATURE 0x04
#define CDC_SET_LINE_CODING 0x20
#define CDC_GET_LINE_CODING 0x21
#define CDC_SET_CONTROL_LINE_STATE 0x22
#define CDC_SEND_BREAK 0x23
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define APP_RX_DATA_SIZE 1024 // I think this must be at least CDC_DATA_FS_OUT_PACKET_SIZE=64 (APP_RX_DATA_SIZE was 2048)
#define APP_TX_DATA_SIZE 1024 // I think this can be any value (was 2048)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static uint8_t dev_is_connected = 0; // indicates if we are connected
static uint8_t UserRxBuffer[APP_RX_DATA_SIZE]; // received data from USB OUT endpoint is stored in this buffer
static uint16_t UserRxBufCur = 0; // points to next available character in UserRxBuffer
static uint16_t UserRxBufLen = 0; // counts number of valid characters in UserRxBuffer
static uint8_t UserTxBuffer[APP_TX_DATA_SIZE]; // data for USB IN endpoind is stored in this buffer
static uint16_t UserTxBufPtrIn = 0; // increment this pointer modulo APP_TX_DATA_SIZE when new data is available
static uint16_t UserTxBufPtrOut = 0; // increment this pointer modulo APP_TX_DATA_SIZE when data is drained
static int user_interrupt_char = VCP_CHAR_NONE;
static void *user_interrupt_data = NULL;
/* USB handler declaration */
extern USBD_HandleTypeDef hUSBDDevice;
/* Private function prototypes -----------------------------------------------*/
static int8_t CDC_Itf_Init (void);
static int8_t CDC_Itf_DeInit (void);
static int8_t CDC_Itf_Control (uint8_t cmd, uint8_t* pbuf, uint16_t length);
static int8_t CDC_Itf_Receive (uint8_t* pbuf, uint32_t *Len);
const USBD_CDC_ItfTypeDef USBD_CDC_fops = {
CDC_Itf_Init,
CDC_Itf_DeInit,
CDC_Itf_Control,
CDC_Itf_Receive
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief CDC_Itf_Init
* Initializes the CDC media low layer
* @param None
* @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_Init(void)
{
#if 0
/*##-1- Configure the UART peripheral ######################################*/
/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
/* USART configured as follow:
- Word Length = 8 Bits
- Stop Bit = One Stop bit
- Parity = No parity
- BaudRate = 115200 baud
- Hardware flow control disabled (RTS and CTS signals) */
UartHandle.Instance = USARTx;
UartHandle.Init.BaudRate = 115200;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
if(HAL_UART_Init(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*##-2- Put UART peripheral in IT reception process ########################*/
/* Any data received will be stored in "UserTxBuffer" buffer */
if(HAL_UART_Receive_IT(&UartHandle, (uint8_t *)UserTxBuffer, 1) != HAL_OK)
{
/* Transfer error in reception process */
Error_Handler();
}
/*##-3- Configure the TIM Base generation #################################*/
now done in HAL_MspInit
TIM_Config();
#endif
/*##-4- Start the TIM Base generation in interrupt mode ####################*/
/* Start Channel1 */
__HAL_TIM_ENABLE_IT(&TIM3_Handle, TIM_IT_UPDATE);
/*##-5- Set Application Buffers ############################################*/
USBD_CDC_SetTxBuffer(&hUSBDDevice, UserTxBuffer, 0);
USBD_CDC_SetRxBuffer(&hUSBDDevice, UserRxBuffer);
UserRxBufCur = 0;
UserRxBufLen = 0;
/* NOTE: we cannot reset these here, because USBD_CDC_SetInterrupt
* may be called before this init function to set these values.
* This can happen if the USB enumeration occurs after the call to
* USBD_CDC_SetInterrupt.
user_interrupt_char = VCP_CHAR_NONE;
user_interrupt_data = NULL;
*/
return (USBD_OK);
}
/**
* @brief CDC_Itf_DeInit
* DeInitializes the CDC media low layer
* @param None
* @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_DeInit(void)
{
#if 0
/* DeInitialize the UART peripheral */
if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
{
/* Initialization Error */
}
#endif
return (USBD_OK);
}
/**
* @brief CDC_Itf_Control
* Manage the CDC class requests
* @param Cmd: Command code
* @param Buf: Buffer containing command data (request parameters)
* @param Len: Number of data to be sent (in bytes)
* @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_Control(uint8_t cmd, uint8_t* pbuf, uint16_t length) {
switch (cmd) {
case CDC_SEND_ENCAPSULATED_COMMAND:
/* Add your code here */
break;
case CDC_GET_ENCAPSULATED_RESPONSE:
/* Add your code here */
break;
case CDC_SET_COMM_FEATURE:
/* Add your code here */
break;
case CDC_GET_COMM_FEATURE:
/* Add your code here */
break;
case CDC_CLEAR_COMM_FEATURE:
/* Add your code here */
break;
case CDC_SET_LINE_CODING:
#if 0
LineCoding.bitrate = (uint32_t)(pbuf[0] | (pbuf[1] << 8) |\
(pbuf[2] << 16) | (pbuf[3] << 24));
LineCoding.format = pbuf[4];
LineCoding.paritytype = pbuf[5];
LineCoding.datatype = pbuf[6];
/* Set the new configuration */
#endif
break;
case CDC_GET_LINE_CODING:
#if 0
pbuf[0] = (uint8_t)(LineCoding.bitrate);
pbuf[1] = (uint8_t)(LineCoding.bitrate >> 8);
pbuf[2] = (uint8_t)(LineCoding.bitrate >> 16);
pbuf[3] = (uint8_t)(LineCoding.bitrate >> 24);
pbuf[4] = LineCoding.format;
pbuf[5] = LineCoding.paritytype;
pbuf[6] = LineCoding.datatype;
#endif
/* Add your code here */
pbuf[0] = (uint8_t)(115200);
pbuf[1] = (uint8_t)(115200 >> 8);
pbuf[2] = (uint8_t)(115200 >> 16);
pbuf[3] = (uint8_t)(115200 >> 24);
pbuf[4] = 0; // stop bits (1)
pbuf[5] = 0; // parity (none)
pbuf[6] = 8; // number of bits (8)
break;
case CDC_SET_CONTROL_LINE_STATE:
dev_is_connected = length & 1; // wValue is passed in Len (bit of a hack)
break;
case CDC_SEND_BREAK:
/* Add your code here */
break;
default:
break;
}
return USBD_OK;
}
/**
* @brief TIM period elapsed callback
* @param htim: TIM handle
* @retval None
*/
void USBD_CDC_HAL_TIM_PeriodElapsedCallback(void) {
uint32_t buffptr;
uint32_t buffsize;
if(UserTxBufPtrOut != UserTxBufPtrIn)
{
if(UserTxBufPtrOut > UserTxBufPtrIn) /* rollback */
{
buffsize = APP_TX_DATA_SIZE - UserTxBufPtrOut;
}
else
{
buffsize = UserTxBufPtrIn - UserTxBufPtrOut;
}
buffptr = UserTxBufPtrOut;
USBD_CDC_SetTxBuffer(&hUSBDDevice, (uint8_t*)&UserTxBuffer[buffptr], buffsize);
if(USBD_CDC_TransmitPacket(&hUSBDDevice) == USBD_OK)
{
UserTxBufPtrOut += buffsize;
if (UserTxBufPtrOut == APP_TX_DATA_SIZE)
{
UserTxBufPtrOut = 0;
}
}
}
}
/**
* @brief CDC_Itf_DataRx
* Data received over USB OUT endpoint is processed here.
* @param Buf: Buffer of data received
* @param Len: Number of data received (in bytes)
* @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
* @note The buffer we are passed here is just UserRxBuffer, so we are
* free to modify it.
*/
static int8_t CDC_Itf_Receive(uint8_t* Buf, uint32_t *Len) {
#if 0
// this sends the data over the UART using DMA
HAL_UART_Transmit_DMA(&UartHandle, Buf, *Len);
#endif
// TODO improve this function to implement a circular buffer
// if we have processed all the characters, reset the buffer counters
if (UserRxBufCur > 0 && UserRxBufCur >= UserRxBufLen) {
memmove(UserRxBuffer, UserRxBuffer + UserRxBufLen, *Len);
UserRxBufCur = 0;
UserRxBufLen = 0;
}
uint32_t delta_len;
if (user_interrupt_char == VCP_CHAR_NONE) {
// no special interrupt character
delta_len = *Len;
} else {
// filter out sepcial interrupt character from the buffer
bool char_found = false;
uint8_t *dest = Buf;
uint8_t *src = Buf;
uint8_t *buf_top = Buf + *Len;
for (; src < buf_top; src++) {
if (*src == user_interrupt_char) {
char_found = true;
} else {
if (char_found) {
*dest = *src;
}
dest++;
}
}
if (char_found) {
// raise exception when interrupts are finished
user_interrupt_char = VCP_CHAR_NONE;
pendsv_nlr_jump(user_interrupt_data);
}
// length of remaining characters
delta_len = dest - Buf;
}
if (UserRxBufLen + delta_len + CDC_DATA_FS_MAX_PACKET_SIZE > APP_RX_DATA_SIZE) {
// if we keep this data then the buffer can overflow on the next USB rx
// so we don't increment the length, and throw this data away
} else {
// data fits, leaving room for another CDC_DATA_FS_OUT_PACKET_SIZE
UserRxBufLen += delta_len;
}
// initiate next USB packet transfer, to append to existing data in buffer
USBD_CDC_SetRxBuffer(&hUSBDDevice, UserRxBuffer + UserRxBufLen);
USBD_CDC_ReceivePacket(&hUSBDDevice);
return USBD_OK;
}
int USBD_CDC_IsConnected(void) {
return dev_is_connected;
}
void USBD_CDC_SetInterrupt(int chr, void *data) {
user_interrupt_char = chr;
user_interrupt_data = data;
}
void USBD_CDC_Tx(const char *str, uint32_t len) {
for (int i = 0; i < len; i++) {
uint timeout = 200;
while (UserTxBufPtrIn + 1 == UserTxBufPtrOut) {
if (timeout-- == 0) {
break;
}
HAL_Delay(1);
}
UserTxBuffer[UserTxBufPtrIn] = str[i];
UserTxBufPtrIn = (UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1);
}
}
int USBD_CDC_RxNum(void) {
return UserRxBufLen - UserRxBufCur;
}
int USBD_CDC_RxGet(void) {
// wait for buffer to have at least 1 character in it
while (USBD_CDC_RxNum() == 0) {
__WFI();
}
// get next character
int c = UserRxBuffer[UserRxBufCur++];
return c;
}
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