STM32串口发送中断

奔跑小蜗牛回答时间：2014-12-20 08:18:54

.。。。。总结的好细致。。。。受教了。。不过，51终究是51，用起来简单，当然也就没那么强大了，stm32虽然复杂，那只是在配置和工作原理上，都熟悉了，性能绝对够不错，万事开头难，上手了就好了。

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万里-363223 回答时间：2014-12-21 09:39:00

奔跑小蜗牛发表于 2014-12-20 08:18
.。。。。总结的好细致。。。。受教了。。不过，51终究是51，用起来简单，当然也就没那么强大了，stm32虽然 ...

恩恩，没错，还是STM32爽

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王建回答时间：2014-12-21 10:51:09

STM32的串口通信，最好使用DMA方式发送。

本帖最后由王建于 2014-12-21 10:57 编辑

至于接收，根据实际情况而定。

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王建回答时间：2014-12-21 10:53:00

/**
  * @file usb_endp.c
  * @author  wjandcf@gmail.com
  * @version V7.0.2
  * @date 2014.12.20
  * @brief Endpoint routines
  *
  */
/* Includes ------------------------------------------------------------------*/
#include "usb_lib.h"
#include "usb_desc.h"
#include "usb_mem.h"
#include "hw_config.h"
#include "usb_istr.h"
#include "usb_pwr.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/

/* Interval between sending IN packets in frame number (1 frame = 1ms) */
#define VCOMPORT_IN_FRAME_INTERVAL          5

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint8_t USB_Rx_Buffer[VIRTUAL_COM_PORT_DATA_SIZE];

extern uint8_t VCP1_Tx_Buffer1[];    /* VCP1 DMA发送缓冲1 */
extern uint8_t VCP2_Tx_Buffer1[];    /* VCP2 DMA发送缓冲1 */
extern uint8_t VCP3_Tx_Buffer1[];    /* VCP3 DMA发送缓冲1 */

extern uint8_t VCP1_Tx_Buffer2[];    /* VCP1 第二缓冲(临时存放来自PC主机的数据包) */
extern uint8_t VCP2_Tx_Buffer2[];    /* VCP2 第二缓冲 */
extern uint8_t VCP3_Tx_Buffer2[];    /* VCP3 第二缓冲 */

extern uint8_t  Flag_VCP1_Tx_Buf_Use;  /* 1: 表示DMA发送已启动，VCP1_Tx_Buffer1被锁定 */
extern uint8_t  Flag_VCP1_Tx_Buf_Full; /* 1: 表示VCP1_Tx_Buffer2数据可能已放满，暂时不能再从主机接收数据 */
extern uint16_t VCP1_Tx_Buffer_Cnt; /* VCP1 第二缓冲收到的字符总数 */

extern uint8_t  Flag_VCP2_Tx_Buf_Use;  /* 1: 表示DMA发送已启动，VCP2_Tx_Buffer1被锁定 */
extern uint8_t  Flag_VCP2_Tx_Buf_Full; /* 1: 表示VCP2_Tx_Buffer2数据可能已放满，暂时不能再从主机接收数据 */
extern uint16_t VCP2_Tx_Buffer_Cnt; /* VCP2 第二缓冲收到的字符总数 */

extern uint8_t  Flag_VCP3_Tx_Buf_Use;  /* 1: 表示DMA发送已启动，VCP3_Tx_Buffer1被锁定 */
extern uint8_t  Flag_VCP3_Tx_Buf_Full; /* 1: 表示VCP3_Tx_Buffer2数据可能已放满，暂时不能再从主机接收数据 */
extern uint16_t VCP3_Tx_Buffer_Cnt; /* VCP3 第二缓冲收到的字符总数 */

extern uint8_t  VCP1_Rx_Buffer[];
extern uint32_t VCP1_Rx_ptr_in;
extern uint32_t VCP1_Rx_ptr_out;
extern uint32_t VCP1_Rx_length;
extern uint8_t  CDC1_Tx_State;

extern uint8_t  VCP2_Rx_Buffer[];
extern uint32_t VCP2_Rx_ptr_in;
extern uint32_t VCP2_Rx_ptr_out;
extern uint32_t VCP2_Rx_length;
extern uint8_t  CDC2_Tx_State;

extern uint8_t  VCP3_Rx_Buffer[];
extern uint32_t VCP3_Rx_ptr_in;
extern uint32_t VCP3_Rx_ptr_out;
extern uint32_t VCP3_Rx_length;
extern uint8_t  CDC3_Tx_State;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/* USB的IN端点发送数据到PC主机 */
#define EPx_IN_Callback(ENDPx, CDCx_Tx_State, VCPx_Rx_Buffer, VCPx_Rx_ptr_out, VCPx_Rx_length) {\
uint16_t USB_Tx_ptr;\
uint16_t USB_Tx_length;\
if (CDCx_Tx_State == 1) {\
      USB_Tx_ptr = VCPx_Rx_ptr_out;\
      if (VCPx_Rx_length == 0) {\
         CDCx_Tx_State = 0;\
         SetEPTxCount(ENDPx,0);\
         SetEPTxValid(ENDPx);\
      } else {\
         if (VCPx_Rx_length > VIRTUAL_COM_PORT_DATA_SIZE) {\
            USB_Tx_length = VIRTUAL_COM_PORT_DATA_SIZE;\
            VCPx_Rx_ptr_out += VIRTUAL_COM_PORT_DATA_SIZE;\
            VCPx_Rx_length -= VIRTUAL_COM_PORT_DATA_SIZE;\
         } else {\
            USB_Tx_length = VCPx_Rx_length;\
            VCPx_Rx_ptr_out += VCPx_Rx_length;\
            VCPx_Rx_length = 0;\
         }\
         USB_SIL_Write(ENDPx, &VCPx_Rx_Buffer[USB_Tx_ptr], USB_Tx_length);\
         SetEPTxValid(ENDPx);\
      }\
}\
}
/* USB的OUT端点通过物理串口向外发送数据(阻塞方式) */
#define EPx_OUT_Callback(ENDPx, USARTx, GPIOx, GPIO_Pin_x) {\
uint32_t i;\
uint16_t USB_Rx_Cnt;\
USB_Rx_Cnt = USB_SIL_Read(ENDPx | 0x00, USB_Rx_Buffer); \
GPIOx->BSRR = GPIO_Pin_x;\
for (i = 0; i < USB_Rx_Cnt; i++) {\
      USARTx->DR = *(USB_Rx_Buffer + i);\
      while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);\
}\
SetEPRxValid(ENDPx);\
while(USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET);\
USART_ClearFlag(USARTx, USART_FLAG_TC);\
GPIOx->BRR = GPIO_Pin_x;\
}

/* USB的OUT端点通过物理串口向外发送数据(DMA方式) */
#define EPx_OUT_Callback_DMA(Flag_VCPx_Tx_Buf_Use, ENDPx, VCPx_Tx_Buffer1,VCPx_Tx_Buffer2,\
GPIOx, GPIO_Pin_x, DMA1_Channelx, VCPx_Tx_Buffer_Cnt, Flag_VCPx_Tx_Buf_Full) {\
uint16_t USB_Rx_Cnt;\
if(Flag_VCPx_Tx_Buf_Use == 0){\
      USB_Rx_Cnt = GetEPRxCount(ENDPx & 0x7F);\
      PMAToUserBufferCopy(&VCPx_Tx_Buffer1[0], GetEPRxAddr(ENDPx & 0x7F), USB_Rx_Cnt);\
      SetEPRxValid(ENDPx);\
      GPIOx->BSRR = GPIO_Pin_x;\
      DMA1_Channelx->CNDTR = USB_Rx_Cnt;\
      DMA_Cmd(DMA1_Channelx, ENABLE);\
      Flag_VCPx_Tx_Buf_Use = 1;\
      VCPx_Tx_Buffer_Cnt = 0;\
} else {\
      USB_Rx_Cnt = GetEPRxCount(ENDPx & 0x7F);\
      if(VCPx_Tx_Buffer_Cnt < (1024-128)){\
      PMAToUserBufferCopy(&VCPx_Tx_Buffer2[VCPx_Tx_Buffer_Cnt], GetEPRxAddr(ENDPx & 0x7F), USB_Rx_Cnt);\
      VCPx_Tx_Buffer_Cnt += USB_Rx_Cnt;\
      SetEPRxValid(ENDPx);\
      } else {\
      PMAToUserBufferCopy(&VCPx_Tx_Buffer2[VCPx_Tx_Buffer_Cnt], GetEPRxAddr(ENDPx & 0x7F), USB_Rx_Cnt);\
      VCPx_Tx_Buffer_Cnt += USB_Rx_Cnt;\
      Flag_VCPx_Tx_Buf_Full = 1;\
      }\
}\
}
/**
* Function Name  : EP2_IN_Callback
* Description :
**/
void EP2_IN_Callback (void) {
EPx_IN_Callback(ENDP2,CDC1_Tx_State,VCP1_Rx_Buffer,VCP1_Rx_ptr_out,VCP1_Rx_length);
}
/**
* Function Name  : EP4_IN_Callback
* Description :
**/
void EP4_IN_Callback(void)
{
EPx_IN_Callback(ENDP4,CDC2_Tx_State,VCP2_Rx_Buffer,VCP2_Rx_ptr_out,VCP2_Rx_length);
}
/**
* Function Name  : EP6_IN_Callback
* Description : VCP3 向PC主机发送数据
**/
void EP6_IN_Callback(void)
{
EPx_IN_Callback(ENDP6,CDC3_Tx_State,VCP3_Rx_Buffer,VCP3_Rx_ptr_out,VCP3_Rx_length);
}
/**
* Function Name  : EP2_OUT_Callback
* Description : VCP1 通过USART1向外送数据
**/
void EP2_OUT_Callback(void) {
#ifdef USB_DMA_SEND
EPx_OUT_Callback_DMA(Flag_VCP1_Tx_Buf_Use, ENDP2, VCP1_Tx_Buffer1,VCP1_Tx_Buffer2,\
         GPIOB, GPIO_Pin_9, DMA1_Channel4, VCP1_Tx_Buffer_Cnt, Flag_VCP1_Tx_Buf_Full);
#else
EPx_OUT_Callback(ENDP2,USART1, GPIOB, GPIO_Pin_9); // DR1 PB9
#endif
}
/**
* Function Name  : EP4_OUT_Callback
* Description : VCP2 通过USART2向外送数据
* Input       : None.
* Output       : None.
* Return       : None.
**/
void EP4_OUT_Callback(void)
{
#ifdef USB_DMA_SEND
EPx_OUT_Callback_DMA(Flag_VCP2_Tx_Buf_Use, ENDP4, VCP2_Tx_Buffer1,VCP2_Tx_Buffer2,\
         GPIOB, GPIO_Pin_8, DMA1_Channel7, VCP2_Tx_Buffer_Cnt, Flag_VCP2_Tx_Buf_Full);
#else
EPx_OUT_Callback(ENDP4,USART2, GPIOB, GPIO_Pin_8); // DR2 PB8
#endif
}
/**
* Function Name  : EP6_OUT_Callback
* Description : VCP3 通过USART3向外送数据
**/
void EP6_OUT_Callback(void){
#ifdef USB_DMA_SEND
EPx_OUT_Callback_DMA(Flag_VCP3_Tx_Buf_Use, ENDP6, VCP3_Tx_Buffer1,VCP3_Tx_Buffer2,\
         GPIOA, GPIO_Pin_5, DMA1_Channel2, VCP3_Tx_Buffer_Cnt, Flag_VCP3_Tx_Buf_Full);
#else
EPx_OUT_Callback(ENDP6,USART3,GPIOA,GPIO_Pin_5);  // DR3 PA5
#endif
}
/**
* Function Name  : SOF_Callback / INTR_SOFINTR_Callback
* Description :
**/
void SOF_Callback(void)
{
static uint32_t FrameCount = 0;
static uint32_t Led_Count = 0;
if(bDeviceState == CONFIGURED) {
      if (FrameCount++ >= VCOMPORT_IN_FRAME_INTERVAL) {
         /* Reset the frame counter */
         FrameCount = 0;
         /* Check the data to be sent through IN pipe */
         Handle_USBAsynchXfer();
      }
}
if(++Led_Count > 999) {
      Led_Count = 0;
      if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_2) == 0){
         GPIOB->BSRR = GPIO_Pin_2; // PB2 H
      } else {
         GPIOB->BRR = GPIO_Pin_2;  // PB2 L
      }
}
}

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