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/**
******************************************************************************
* @file USB_Device/CDC_Standalone/Src/usbd_cdc_interface.c
* @author MCD Application Team
* @brief Source file for USBD CDC interface
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------ */
#include "main.h"
/* Private typedef ----------------------------------------------------------- */
/* Private define ------------------------------------------------------------ */
#define APP_RX_DATA_SIZE 2048
#define APP_TX_DATA_SIZE 2048
/* Private macro ------------------------------------------------------------- */
/* Private variables --------------------------------------------------------- */
USBD_CDC_LineCodingTypeDef LineCoding = {
115200, /* baud rate */
0x00, /* stop bits-1 */
0x00, /* parity - none */
0x08 /* nb. of bits 8 */
};
uint8_t UserRxBuffer[APP_RX_DATA_SIZE]; /* Received Data over USB are stored in
* this buffer */
uint8_t UserTxBuffer[APP_TX_DATA_SIZE]; /* Received Data over UART (CDC
* interface) are stored in this buffer
*/
uint32_t UserTxBufPtrIn = 0; /* Increment this pointer or roll it back to
* start address when data are received over
* USART */
uint32_t UserTxBufPtrOut = 0; /* Increment this pointer or roll it back to
* start address when data are sent over USB */
/* UART handler declaration */
UART_HandleTypeDef UartHandle;
/* TIM handler declaration */
TIM_HandleTypeDef TimHandle;
/* USB handler declaration */
extern USBD_HandleTypeDef USBD_Device;
/* 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);
static int8_t CDC_Itf_TransmitCplt(uint8_t *pbuf, uint32_t *Len, uint8_t epnum);
static void Error_Handler(void);
static void ComPort_Config(void);
static void TIM_Config(void);
USBD_CDC_ItfTypeDef USBD_CDC_fops = {
CDC_Itf_Init,
CDC_Itf_DeInit,
CDC_Itf_Control,
CDC_Itf_Receive,
CDC_Itf_TransmitCplt
};
/* Private functions --------------------------------------------------------- */
/**
* @brief Initializes the CDC media low layer
* @param None
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_Init(void)
{
/* ##-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;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
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 + UserTxBufPtrIn), 1) != HAL_OK)
{
/* Transfer error in reception process */
Error_Handler();
}
/* ##-3- Configure the TIM Base generation ################################# */
TIM_Config();
/* ##-4- Start the TIM Base generation in interrupt mode #################### */
/* Start Channel1 */
if (HAL_TIM_Base_Start_IT(&TimHandle) != HAL_OK)
{
/* Starting Error */
Error_Handler();
}
/* ##-5- Set Application Buffers ############################################ */
USBD_CDC_SetTxBuffer(&USBD_Device, UserTxBuffer, 0);
USBD_CDC_SetRxBuffer(&USBD_Device, UserRxBuffer);
return (USBD_OK);
}
/**
* @brief CDC_Itf_DeInit
* DeInitializes the CDC media low layer
* @param None
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_DeInit(void)
{
/* DeInitialize the UART peripheral */
if (HAL_UART_DeInit(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
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 operation: 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:
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 */
ComPort_Config();
break;
case CDC_GET_LINE_CODING:
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;
break;
case CDC_SET_CONTROL_LINE_STATE:
/* Add your code here */
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 HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim)
{
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(&USBD_Device, (uint8_t *) & UserTxBuffer[buffptr],
buffsize);
if (USBD_CDC_TransmitPacket(&USBD_Device) == USBD_OK)
{
UserTxBufPtrOut += buffsize;
if (UserTxBufPtrOut == APP_RX_DATA_SIZE)
{
UserTxBufPtrOut = 0;
}
}
}
}
/**
* @brief Rx Transfer completed callback
* @param huart: UART handle
* @retval None
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef * huart)
{
/* Increment Index for buffer writing */
UserTxBufPtrIn++;
/* To avoid buffer overflow */
if (UserTxBufPtrIn == APP_RX_DATA_SIZE)
{
UserTxBufPtrIn = 0;
}
/* Start another reception: provide the buffer pointer with offset and the
* buffer size */
HAL_UART_Receive_IT(huart, (uint8_t *) (UserTxBuffer + UserTxBufPtrIn), 1);
}
/**
* @brief CDC_Itf_DataRx
* Data received over USB OUT endpoint are sent over CDC interface
* through this function.
* @param Buf: Buffer of data to be transmitted
* @param Len: Number of data received (in bytes)
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_Receive(uint8_t * Buf, uint32_t * Len)
{
HAL_UART_Transmit_DMA(&UartHandle, Buf, *Len);
return (USBD_OK);
}
/**
* @brief CDC_Itf_TransmitCplt
* Data transmitted callback
*
* @note
* This function is IN transfer complete callback used to inform user that
* the submitted Data is successfully sent over USB.
*
* @param Buf: Buffer of data to be received
* @param Len: Number of data received (in bytes)
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t CDC_Itf_TransmitCplt(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
{
return (0);
}
/**
* @brief Tx Transfer completed callback
* @param huart: UART handle
* @retval None
*/
void HAL_UART_TxCpltCallback(UART_HandleTypeDef * huart)
{
/* Initiate next USB packet transfer once UART completes transfer
* (transmitting data over Tx line) */
USBD_CDC_ReceivePacket(&USBD_Device);
}
/**
* @brief ComPort_Config
* Configure the COM Port with the parameters received from host.
* @param None.
* @retval None
* @note When a configuration is not supported, a default value is used.
*/
static void ComPort_Config(void)
{
if (HAL_UART_DeInit(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* set the Stop bit */
switch (LineCoding.format)
{
case 0:
UartHandle.Init.StopBits = UART_STOPBITS_1;
break;
case 2:
UartHandle.Init.StopBits = UART_STOPBITS_2;
break;
default:
UartHandle.Init.StopBits = UART_STOPBITS_1;
break;
}
/* set the parity bit */
switch (LineCoding.paritytype)
{
case 0:
UartHandle.Init.Parity = UART_PARITY_NONE;
break;
case 1:
UartHandle.Init.Parity = UART_PARITY_ODD;
break;
case 2:
UartHandle.Init.Parity = UART_PARITY_EVEN;
break;
default:
UartHandle.Init.Parity = UART_PARITY_NONE;
break;
}
/* set the data type : only 8bits and 9bits is supported */
switch (LineCoding.datatype)
{
case 0x07:
/* With this configuration a parity (Even or Odd) must be set */
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
break;
case 0x08:
if (UartHandle.Init.Parity == UART_PARITY_NONE)
{
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
}
else
{
UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
}
break;
default:
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
break;
}
UartHandle.Init.BaudRate = LineCoding.bitrate;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Start reception: provide the buffer pointer with offset and the buffer
* size */
HAL_UART_Receive_IT(&UartHandle, (uint8_t *) (UserTxBuffer + UserTxBufPtrIn),
1);
}
/**
* @brief TIM_Config: Configure TIMx timer
* @param None.
* @retval None
*/
static void TIM_Config(void)
{
/* Set TIMx instance */
TimHandle.Instance = TIMx;
/* Initialize TIM3 peripheral as follows: + Period = (CDC_POLLING_INTERVAL *
* 10000) - 1 + Prescaler = ((APB1 frequency / 1000000) - 1) + ClockDivision
* = 0 + Counter direction = Up */
TimHandle.Init.Period = (CDC_POLLING_INTERVAL * 1000) - 1;
TimHandle.Init.Prescaler = 84 - 1;
TimHandle.Init.ClockDivision = 0;
TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
if (HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
}
/**
* @brief UART error callbacks
* @param UartHandle: UART handle
* @retval None
*/
void HAL_UART_ErrorCallback(UART_HandleTypeDef * UartHandle)
{
/* Transfer error occurred in reception and/or transmission process */
Error_Handler();
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Add your own code here */
}
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