usart串口配置（与中断函数）

Simow、

已于 2024-03-31 20:22:10 修改

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CC 4.0 BY-SA版权

文章标签：单片机嵌入式硬件

于 2024-03-27 21:08:12 首次发布

本文链接：https://blog.youkuaiyun.com/Simow/article/details/137089624

本文介绍了如何在GD32F30x微控制器中使用USART0进行串口通信，包括发送和接收字节函数，以及使用中断处理接收数据并将数据存入DataBuffer。同时展示了中断触发时如何处理接收到的数据。

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#include "gd32f30x.h"
#include "stdio.h"

void UsartSendByte(uint32_t usart,unsigned char dat){
   while( !usart_flag_get(usart,USART_FLAG_TBE));
   usart_data_transmit(usart,dat);
   while( !usart_flag_get(usart,USART_FLAG_TC));
}

unsigned char UsartRecvByte(uint32_t usart){
while( !usart_flag_get(usart,USART_FLAG_RBNE) );
return usart_data_receive(usart);
}

int fputc(int c, FILE * stream){
UsartSendByte(USART0,c);
return c;
}

static unsigned char DataBuffer[128] ={0};
#define DATA_BUFFER_LEN sizeof(DataBuffer)
volatile int DB_WPos = 0;
volatile int DB_RPos = 0;

char DataBufferHasData(){ return DB_WPos!=DB_RPos; }

void DataBufferWrite(unsigned char data){
   int pos = DB_WPos;
   DataBuffer[pos] = data;
   if( pos+1 < DATA_BUFFER_LEN ){ ++DB_WPos; }
   else{ DB_WPos=0; }
}

unsigned char DataBufferRead(){
   int pos = DB_RPos;
   if( pos+1 < DATA_BUFFER_LEN ){ ++DB_RPos; }
   else{ DB_RPos=0; }
   return DataBuffer[pos];
}

void USART0_IRQHandler(){
   if( usart_interrupt_flag_get(USART0,USART_INT_FLAG_RBNE)){
       usart_interrupt_flag_clear(USART0,USART_INT_FLAG_RBNE);
       unsigned data = usart_data_receive(USART0);
       DataBufferWrite(data);
   }
}

int fgetc(FILE *stream){
   while( !DataBufferHasData() );
   return DataBufferRead();
   //return UsartRecvByte(USART0);
}

int main(){
   rcu_periph_clock_enable(RCU_AF);

//   rcu_periph_clock_enable(RCU_GPIOA);
//   gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_2MHZ,GPIO_PIN_9);
//   gpio_init(GPIOA,GPIO_MODE_IPU,GPIO_OSPEED_2MHZ,GPIO_PIN_10);

   rcu_periph_clock_enable(RCU_GPIOB);
   gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_2MHZ,GPIO_PIN_6);
   gpio_init(GPIOB,GPIO_MODE_IPU,GPIO_OSPEED_2MHZ,GPIO_PIN_7);
   gpio_pin_remap_config(GPIO_USART0_REMAP,ENABLE);

   rcu_periph_clock_enable(RCU_USART0);
   usart_deinit(USART0);
   usart_baudrate_set(USART0,115200);
   usart_parity_config(USART0,USART_PM_NONE);
   usart_word_length_set(USART0,USART_WL_8BIT);
   usart_stop_bit_set(USART0,USART_STB_1BIT);

   usart_transmit_config(USART0,USART_TRANSMIT_ENABLE);
   usart_receive_config(USART0,USART_RECEIVE_ENABLE);
   usart_interrupt_enable(USART0,USART_INT_RBNE);
   usart_enable(USART0);

   nvic_irq_enable(USART0_IRQn,0,0);

   int a=0,b=0;
   while(1){
//       unsigned dat = UsartRecvByte(USART0);
//       UsartSendByte(USART0,dat);
       printf("intput two number A,B\r\n",12334);
       int ret = scanf("%d%d",&a,&b);
       if( 2 == ret){
           printf("you input %d + %d = %d\r\n",a,b,a+b);
       }else{
           printf("input error\r\n");
       }
   }
}