STM32：UART-接收不定长数据

1万 · 2024-4-30 16:50

正文
空闲帧

一空闲帧所需要的时间：1位起始位+8位数据位+1位校验位+1位停止位。

编程要点
串口硬件相关宏定义，bsp_uart.h

#ifndef __BSP_UART_H
#define __BSP_UART_H

#include "stm32f10x.h"
#include <stdio.h>

#define RCC_UART_GPIO_Clk_Cmd          RCC_APB2PeriphClockCmd
#define RCC_UART_GPIO_Clk             RCC_APB2Periph_GPIOA

#define UART_GPIO_Tx_Pin             GPIO_Pin_9
#define UART_GPIO_Tx_Port             GPIOA

#define UART_GPIO_Rx_Pin             GPIO_Pin_10
#define UART_GPIO_Rx_Port             GPIOA

#define BSP_USARTx                   USART1
#define RCC_UART_Clk_Cmd             RCC_APB2PeriphClockCmd
#define RCC_UART_Clk                   RCC_APB2Periph_USART1
#define UART_BaudRate                115200

#define BSP_USARTx_IRQHandler          USART1_IRQHandler

void BSP_UART_Init(void);

#endif /* __BSP_UART_H */

串口模块配置，bsp_uart.c

#include "bsp_uart.h"

static void BSP_UART_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_UART_GPIO_Clk_Cmd(RCC_UART_GPIO_Clk,ENABLE);
GPIO_InitStructure.GPIO_Pin = UART_GPIO_Tx_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(UART_GPIO_Tx_Port,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = UART_GPIO_Rx_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(UART_GPIO_Rx_Port,&GPIO_InitStructure);
}

static void BSP_UART_Config(void)
{
USART_InitTypeDef USART_InitStructure;
RCC_UART_Clk_Cmd(RCC_UART_Clk,ENABLE);
USART_InitStructure.USART_BaudRate = UART_BaudRate;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits =USART_StopBits_1;
USART_InitStructure.USART_WordLength =USART_WordLength_8b;
USART_Init(BSP_USARTx,&USART_InitStructure);
USART_ITConfig(BSP_USARTx,USART_IT_RXNE,ENABLE);
USART_ITConfig(BSP_USARTx,USART_IT_IDLE,ENABLE);

USART_Cmd(BSP_USARTx,ENABLE);
}

void BSP_UART_Init(void)
{
BSP_UART_Config();
BSP_UART_GPIO_Config();
}

串口不定长数据接收
主函数，main.c

#define data_size 100

typedef struct{
uint16_t flag;
uint16_t len;
char data[data_size];
}Data_TypeDef;

void Data_Process(Data_TypeDef* Data_Struct)
{
Usart_SendString(BSP_USARTx,Data_Struct->data);

Data_Struct->flag = 0;
Data_Struct->len = 0;
}

void BSP_NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

Data_TypeDef Data_Structure;

int main(void)
{
BSP_UART_Init();
BSP_NVIC_Config();
while(1)
{
      if(Data_Structure.flag == 1)
      {
         Data_Process(&Data_Structure);
      }
}
}

中断服务，stm32f10x_it.c

extern Data_TypeDef Data_Structure;

void BSP_USARTx_IRQHandler(void)
{
  if(USART_GetITStatus(BSP_USARTx, USART_IT_RXNE) != RESET)
  {
/* Read one byte from the receive data register */
Data_Struct.data[Data_Structure.len] = USART_ReceiveData(BSP_USARTx);
if(++Data_Structure.len > data_size - 2)
{
      Data_Struct.len = 0;
}

  }
  if(USART_GetITStatus(BSP_USARTx,USART_IT_IDLE) != RESET)
  {
      BSP_USARTx->SR;
      BSP_USARTx->DR;
      Data_Structure.data[Data_Structure.len] = '\0';
      Data_Structure.flag = 1;
  }

}

这里使用软件清除RXNE标志，对USART_DR读操作可以将该位清零。

这里使用软件清除IDLE标志，对USART_SR,USART_DR读操作可以将该位清零。
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原文链接：https://blog.csdn.net/ZipingPan/article/details/137313795