Question

美好的一天。我试图从Stm32 std库运行UART示例脚本，似乎它不起作用。我使用这样的电路板：

通过USART1上传固件。 USART初始化代码：

#include <stm32f10x.h>
#include <misc.h>

volatile char received_string[MAX_STRLEN+1];

void Delay(__IO uint32_t nCount) {
  while(nCount--) {
  }
}

void init_USART1(uint32_t baudrate){

   GPIO_InitTypeDef GPIO_InitStruct;
   USART_InitTypeDef USART_InitStruct;
   NVIC_InitTypeDef NVIC_InitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);


   GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
   GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOA, &GPIO_InitStruct);

   GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
   GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING; 
   GPIO_Init(GPIOA, &GPIO_InitStruct);

   USART_InitStruct.USART_BaudRate = baudrate;
   USART_InitStruct.USART_WordLength = USART_WordLength_8b;
   USART_InitStruct.USART_StopBits = USART_StopBits_1;
   USART_InitStruct.USART_Parity = USART_Parity_No;
   USART_InitStruct.USART_HardwareFlowControl =    USART_HardwareFlowControl_None;
   USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
   USART_Init(USART1, &USART_InitStruct);

   USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);


   NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
   NVIC_Init(&NVIC_InitStructure);      

   USART_Cmd(USART1, ENABLE);
}

void USART_puts(USART_TypeDef* USARTx, volatile char *s){

   while(*s){
      while( !(USARTx->SR & 0x00000040) );
      USART_SendData(USARTx, *s);
      *s++;
   }
}

int main(void) {

  init_USART1(9600); // initialize USART1 @ 9600 baud

  USART_puts(USART1, "Init complete! Hello World!\r\n"); // just send a message to indicate that it works

   while (1){
     /*
      * You can do whatever you want in here
      */
   }
}

void USART1_IRQHandler(void){

    // check if the USART1 receive interrupt flag was set
    if( USART_GetITStatus(USART1, USART_IT_RXNE) ){

        static uint8_t cnt = 0; // this counter is used to determine the string length
        char t = USART1->DR; // the character from the USART1 data register is saved in t

        // check if the received character is not the LF character (used to determine end of string)
        // or the if the maximum string length has been been reached
        if( (t != '\n') && (cnt < MAX_STRLEN) ){
            received_string[cnt] = t;
            cnt++;
        }
         else{ // otherwise reset the character counter and print the received string
           cnt = 0;
           USART_puts(USART1, received_string);
        }
    }
}

USART1端口正在使用NVIC启用。

Answer 1

您可以尝试将USART_puts（）函数更改为：

void USART_puts(USART_TypeDef* USARTx, volatile char *s){
    while(*s)
    {
      while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);// Wait the set of TXE
      USART_SendData(USART1, *(s++));
      while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);// Wait the end of transmit
    }
}

Answer 2

我正在像您一样使用Stdpriph方法。我的代码有效。你能给它一个试用伴侣吗？

#include <stm32f10x.h>
#include <stdio.h>
#include <stm32f10x_usart.h>
#include <stm32f10x_gpio.h>
#include <stm32f10x_rcc.h>


static unsigned int LEDState = 0;


static void USART_SendString(USART_TypeDef* USARTx, char* s)
{
    while(*s)
    {
    while(!USART_GetFlagStatus(USARTx, USART_FLAG_TC));
    USART_SendData(USARTx, *s);
    s++;
}
  }




void USART1_IRQHandler(void)
{
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
  {

    if((char)USART_ReceiveData(USART1) == '1'){
        LEDState = 2;
            GPIO_WriteBit(GPIOA, GPIO_Pin_0, Bit_SET);


            }

    if((char)USART_ReceiveData(USART1) == '0')
        LEDState = 1;
            GPIO_WriteBit(GPIOA, GPIO_Pin_0, Bit_RESET);
}
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
 }




  int main(){

   SystemInit();
  GPIO_InitTypeDef GPIO_InitStructure;
   USART_InitTypeDef USART_InitStructure;
 USART_ClockInitTypeDef USART_ClockInitStructure; 
  NVIC_InitTypeDef NVIC_InitStructure;

    //----------------------------------------------------------------  

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); 
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin     = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed   = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Pin     = GPIO_Pin_9 ;
  GPIO_InitStructure.GPIO_Speed   = GPIO_Speed_50MHz;
   GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; 
  GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_Parity                = USART_Parity_No;
USART_InitStructure.USART_StopBits              = USART_StopBits_1;
USART_InitStructure.USART_HardwareFlowControl   = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode                  = USART_Mode_Tx | USART_Mode_Rx;

USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel          = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd       = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_InitStructure);





  //GPIO
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //GPIOA pin 0 output push pull
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);





       /*   GPIO_InitTypeDef GPIO_InitStructure;



        TIM_TimeBaseInitTypeDef TIM3_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);


     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM3_InitStructure.TIM_Prescaler         = 50 ; //Prescaler degeri.
TIM3_InitStructure.TIM_CounterMode       = TIM_CounterMode_Up; //Timer yukari sayacak sekilde ayarlandi.
TIM3_InitStructure.TIM_Period            = 48000;//Period degeri.
TIM3_InitStructure.TIM_ClockDivision     = TIM_CKD_DIV1;//Bölme orani 1 yani geçersiz-kapali.
TIM_TimeBaseInit(TIM3, &TIM3_InitStructure);//Ayarlari yükle
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); // Kesmeyi aktif ediyoruz.

NVIC_InitStructure.NVIC_IRQChannel          = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0;
NVIC_InitStructure.NVIC_IRQChannelCmd       = ENABLE;
NVIC_Init(&NVIC_InitStructure);

 TIM_Cmd(TIM3, ENABLE);*/





while(1)
{
    char temp= USART_ReceiveData(USART1);
    /*if(LEDState == 2) {
        GPIO_SetBits(GPIOC, GPIO_Pin_8);
        USART_SendString(USART1, "LED On\r\n");
        LEDState = 0;
    }
    if(LEDState == 1) {
        GPIO_ResetBits(GPIOC, GPIO_Pin_8);
        USART_SendString(USART1, "LED Off\r\n");
        LEDState = 0;
    }
}*/




    }

}

stm32f103c8t6 USART1中断不起作用

2 个答案: