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circuitpython/stmhal/usbd_cdc_interface.c

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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_hid.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++) {
// if the buffer is full, wait until it gets drained, with a timeout of 1000ms (wraparound of tick is taken care of by 2's complement arithmetic)
uint32_t start = HAL_GetTick();
while (((UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1)) == UserTxBufPtrOut && HAL_GetTick() - start <= 1000) {
__WFI(); // enter sleep mode, waiting for interrupt
}
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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