範例版本
* Version : V3.2.1
* Date : 07/05/2010
USART傳回USB使用USART1的interrupt當USART1 RX中斷發生呼叫function
USART_To_USB_Send_Data
檔案"stm32f10x_it.c"
#if defined (USE_STM3210B_EVAL) || defined (USE_STM3210E_EVAL)
/*******************************************************************************
* Function Name : USART1_IRQHandler
* Description : This function handles USART1 global interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART1_IRQHandler(void)
{
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
/* Send the received data to the PC Host*/
USART_To_USB_Send_Data();
}
/* If overrun condition occurs, clear the ORE flag and recover communication */
if (USART_GetFlagStatus(USART1, USART_FLAG_ORE) != RESET)
{
(void)USART_ReceiveData(USART1);
}
}
#endif /* USE_STM3210B_EVAL or USE_STM3210E_EVAL */
USART_To_USB_Send_Data() function利用USART_ReceiveData收到USART資料放入USART_Rx_Buffer中，並將USART_Rx_ptr_in +1計數收到資料個數，USB中斷發生時會將資料傳回
檔案"hw_config.c"
/*******************************************************************************
* Function Name : UART_To_USB_Send_Data.
* Description : send the received data from UART 0 to USB.
* Input : None.
* Return : none.
*******************************************************************************/
void USART_To_USB_Send_Data(void)
{
if (linecoding.datatype == 7)
{
USART_Rx_Buffer[USART_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1) & 0x7F;
}
else if (linecoding.datatype == 8)
{
USART_Rx_Buffer[USART_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1);
}
USART_Rx_ptr_in++;
/* To avoid buffer overflow */
if(USART_Rx_ptr_in == USART_RX_DATA_SIZE)
{
USART_Rx_ptr_in = 0;
}
}
USB傳入USART使用USB的interrupt，當USB收到資料將發生中斷呼叫function EP3_OUT_Callback，使用USB_SIL_Read收到資料放入USB_Rx_Buffer並得到資料個數USB_Rx_Cnt，呼叫USB_To_USART_Send_Datar將資料由USART傳出
檔案"usb_endp.c"
/*******************************************************************************
* Function Name : EP3_OUT_Callback
* Description :
* Input : None.
* Output : None.
* Return : None.
*******************************************************************************/
void EP3_OUT_Callback(void)
{
uint16_t USB_Rx_Cnt;
/* Get the received data buffer and update the counter */
USB_Rx_Cnt = USB_SIL_Read(EP3_OUT, USB_Rx_Buffer);
CHAR_Rx_Cnt=0;
/* USB data will be immediately processed, this allow next USB traffic beeing
NAKed till the end of the USART Xfet */
USB_To_USART_Send_Data(USB_Rx_Buffer, USB_Rx_Cnt);
#ifndef STM32F10X_CL
/* Enable the receive of data on EP3 */
SetEPRxValid(ENDP3);
#endif /* STM32F10X_CL */
}
檔案"hw_config.c"
/*******************************************************************************
* Function Name : USB_To_USART_Send_Data.
* Description : send the received data from USB to the UART 0.
* Input : data_buffer: data address.
Nb_bytes: number of bytes to send.
* Return : none.
*******************************************************************************/
void USB_To_USART_Send_Data(uint8_t* data_buffer, uint8_t Nb_bytes)
{
uint32_t i;
for (i = 0; i < Nb_bytes; i++)
{
USART_SendData(EVAL_COM1, *(data_buffer + i));
while(USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TXE) == RESET);
}
}
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