STM32F4串口3的问题-第2页回答

STM32F4串口3的问题

2019-07-20 14:18发布

把串口一改为串口三，程序都跑不了了，是怎么回事呢】

#include "sys.h"
#include "usart.h"

#if SYSTEM_SUPPORT_OS
#include "includes.h"                                     //ucos ê1óÃ
#endif

#if 1
#pragma import(__use_no_semihosting)
struct __FILE
{
      int handle;
};

FILE __stdout;
void _sys_exit(int x)
{
      x = x;
}
int fputc(int ch, FILE *f)
{
      while((USART3->SR&0X40)==0);
      USART3->DR = (u8) ch;
      return ch;
}
#endif

#if EN_USART3_RX
u8 USART_RX_BUF[USART_REC_LEN] __attribute__ ((at(0X20001000)));
u16 USART_RX_STA=0;
u32 USART_RX_CNT=0;


void uart_init(u32 bound){
GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

      GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART3); //
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource11,GPIO_AF_USART3); //

      //USART1¶Ë¿úÅäÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOB,&GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = bound;
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      USART_InitStructure.USART_Parity = USART_Parity_No;
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART3, &USART_InitStructure);

  USART_Cmd(USART3, ENABLE);

      //USART_ClearFlag(USART1, USART_FLAG_TC);

#if EN_USART3_RX
      USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

      //Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

#endif

}

void USART3_IRQHandler(void)
{
      u8 Res;
#if SYSTEM_SUPPORT_OS
      OSIntEnter();
#endif
      if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
      {
            Res =USART_ReceiveData(USART3);//(USART1->DR);

                     if(USART_RX_CNT<USART_REC_LEN)
            {
                     USART_RX_BUF[USART_RX_CNT]=Res;
                     USART_RX_CNT++;
            }
  }
#if SYSTEM_SUPPORT_OS
      OSIntExit();
#endif
}
#endif

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