【经验分享】STM32串口多机通信

[复制链接]

STMCU小助手发布时间：2022-1-23 15:26

技术帖
文章封面:
文章简介:	STM32串口多机通信

最近在做多节点无线通信，用到STM32 USART多机串行通信。

记录下多机串行通信配置要点。

下面是我封装的会用到的函数：

// .h
#ifndef _MULTIUSART_H
#define _MULTIUSART_H
#include "sys.h"
#include "stm32f10x_usart.h"
/*
USART_SR状态寄存器
USART_DR数据寄存器
USART_BRR波特率寄存器
TXD-PA9
RXD-PA10
*/
#define USART_REC_LEN 60
#define EN_USART1_RX 1 //使能（1）/禁止（0）串口1接收
extern u8 USART_RX_BUF[USART_REC_LEN]; //接收缓冲,最大USART_REC_LEN个字节.末字节为换行符
extern u16 USART_RX_STA; //接收状态标记
extern void USART_InitEx(u32 bound);
extern void USART_SendDataEx(USART_TypeDef* USARTx, uint16_t Data);
extern void USART_SendAddr(USART_TypeDef* USARTx, uint16_t Addr);
#endif

复制代码

// .c
#include "MultiUSART.h"
//串口1中断服务程序
//注意,读取USARTx->SR能避免莫名其妙的错误
u8 USART_RX_BUF[USART_REC_LEN] = ""; //接收缓冲,最大USART_REC_LEN个字节.
//接收状态
//bit15，接收完成标志
//bit14，接收到0x0d
//bit13~0，接收到的有效字节数目
u16 USART_RX_STA=0; //接收状态标记
void USART_InitEx(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟
USART_DeInit(USART1); //复位串口1
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
//Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure);
//USART 初始化设置
USART_InitStructure.USART_BaudRate = bound;
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
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(USART1, &USART_InitStructure); //初始化串口
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启中断接收中断
USART_Cmd(USART1, ENABLE); //使能串口
USART_SetAddress(USART1, 0x01); //设置USART1节点地址
//USART_WakeUpConfig(USART1, USART_WakeUp_AddressMark);//地址标记唤醒
//USART_ReceiverWakeUpCmd(USART1,ENABLE);
}
void USART_SendDataEx(USART_TypeDef* USARTx, uint16_t Data)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_DATA(Data));
/* Transmit Data */
USARTx->DR = (Data & (uint16_t)0x01FF);
//等待发送缓冲区空
//或等待发送结束
//while((USART1->SR&0X40)==0);
while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET){};
}
void USART_SendAddr(USART_TypeDef* USARTx, uint16_t Addr)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
// 9位字长，最高位为1，低四位为地址
//USARTx->DR = (1<<8) | Addr;
Addr |= (uint16_t)0x0100;
USARTx->DR = (Addr & (uint16_t)0x010F);
}
#if EN_USART1_RX
void USART1_IRQHandler(void) //串口1中断服务程序
{
u8 Res;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
Res =USART_ReceiveData(USART1);//(USART1->DR); //读取接收到的数据
if((USART_RX_STA&0x8000)==0) //接收未完成
{
if(USART_RX_STA&0x4000) //接收到了0x0d
{
if(Res!=0x0a)
USART_RX_STA=0; //接收错误,重新开始
else
USART_RX_STA|=0x8000; //接收完成了
}
else //还没收到0X0D
{
if(Res==0x0d)
USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))
USART_RX_STA=0; //接收数据错误,重新开始接收
}
}
}
}
}
#endif