STM32 串口通信配置 源代码（USART1+USART2+USART3+UART4）
一、串口一的配置（初始化+中断配置+中断接收函数）
/*===============================================================================
Copyright:
Version:
Author:
Date: 2017/11/3
Description:
配置独立看门狗初始化函数，在主函数中运行IWDG_ReloadCounter进行喂狗主函数必须在4s内进行一次喂狗不然系统会复位；
函数功能是将接收固定长度的字符串，并将接收后的字符串通过串口发送出去
revise Description:
===============================================================================*/
#include "stm32f10x_usart.h"
#include "stm32f10x.h"
#include "stm32f10x_iwdg.h"
u8 USART1_RX_BUF[21];
u8 USART1_RX_CNT=0;
void IWDG_Configuration(void);
void Usart1_Init(u32 bound)
{
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC, ENABLE);//使能USART1,GPIOA,C时钟
//USART1_TX GPIOA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.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);//初始化GPIOA.9
//USART1_RX GPIOA.10初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10
//Usart1 NVIC 配置
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 0-3;
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); //根据指定的参数初始化VIC寄存器
//USART 初始化设置
USART_InitStructure.USART_BaudRate = bound;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART1, &USART_InitStructure); //初始化串口1
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
USART_Cmd(USART1, ENABLE); //使能串口1
}
/**
* USART1发送len个字节.
* buf:发送区首地址
* len:发送的字节数(为了和本代码的接收匹配,这里建议不要超过64个字节)
**/
void USART1_Send_Data(u8 *buf,u16 len)
{
u16 t;
GPIO_SetBits(GPIOC,GPIO_Pin_9);
// RS485_TX_EN=1; //设置为发送模式
for(t=0;t
二、串口二的配置（初始化+中断配置+中断接收函数）
/*===============================================================================
Copyright:
Version:
Author:
Date: 2017/11/3
Description:
函数功能是将接收固定长度的字符串，并将接收后的字符串通过串口发送出去
revise Description:
===============================================================================*/
#include "stm32f10x_usart.h"
#include "stm32f10x.h"
#include "stm32f10x_iwdg.h"
u8 USART2_RX_BUF[250];
u8 USART2_RX_CNT=0;
u16 USART2_RX_STA=0; //接收状态标记
void Usart2_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//|RCC_APB2Periph_AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//使能GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);//复位串口2
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);//停止复位
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 0-3;
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //使能串口2中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级2级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
USART_InitStructure.USART_BaudRate = bound;//波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位数据长度
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;///奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//收发模式
USART_Init(USART2, &USART_InitStructure); ; //初始化串口
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
USART_Cmd(USART2, ENABLE); //使能串口
}
/**
* USART2发送len个字节.
* buf:发送区首地址
* len:发送的字节数(为了和本代码的接收匹配,这里建议不要超过64个字节)
**/
void USART2_Send_Data(u8 *buf,u16 len)
{
u16 t;
for(t=0;t
三、串口三的配置（初始化+中断配置+中断接收函数）
/*===============================================================================
Copyright:
Version:
Author:
Date: 2017/11/3
Description:
函数功能是将接收固定长度的字符串，并将接收后的字符串通过串口发送出去
通过滴答定时器方式获取数据
revise Description:
===============================================================================*/
#include "stm32f10x_usart.h"
#include "stm32f10x.h"
#define USART3_TIMEOUT_Setting 800 //(ms)
u8 USART3_RX_BUF[250];
u16 USART3_RX_CNT=0;
u16 USART3_RX_TIMEOUT=0; //接收状态标记
void Timer1CountInitial(void);
void USART3_Init(u32 baud)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量，用来初始化GPIO
//使能串口的RCC时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE); //使能UART3所在GPIOB的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
//串口使用的GPIO口配置
// Configure USART3 Rx (PB.11) as input floating
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Configure USART3 Tx (PB.10) as alternate function push-pull
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//配置串口
USART_InitStructure.USART_BaudRate = baud;
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;
// Configure USART3
USART_Init(USART3, &USART_InitStructure);//配置串口3
// Enable USART3 Receive interrupts 使能串口接收中断
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
// Enable the USART3
USART_Cmd(USART3, ENABLE);//使能串口3
//串口中断配置
//Configure the NVIC Preemption Priority Bits
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
// Enable the USART3 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void USART3_Sned_Char(u8 temp)
{
USART_SendData(USART3,(u8)temp);
while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);
}
void USART3_Sned_Char_Buff(u8 buf[],u32 len)
{
u32 i;
for(i=0;i
四、串口四的配置（初始化+中断配置+中断接收函数）
注意串口四的中断优先级没有贴出来，和前面的三个一样的配置，为了不占用过多的篇幅就不贴中断优先级配置了
/*===============================================================================
Copyright:
Version:
Author:
Date: 2017/11/3
Description:
函数功能是将接收固定长度的字符串，并将接收后的字符串通过串口发送出去
通过滴答定时器方式获取数据
revise Description:
===============================================================================*/
#include "stm32f10x_usart.h"
#include "stm32f10x.h"
#define USART4_TIMEOUT_Setting 800 //(ms)
u8 USART4_RX_BUF[250];
u16 USART4_RX_CNT=0;
u16 USART2_RX_STA=0; //接收状态标记
void Systick_delay_init(u8 SYSCLK);
u8 virtual_delay(u32 num,u8 unit);
//通用异步收发器UART4
void UART4_Init(u32 bound)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//used for USART3 full remap
//GPIO_PinRemapConfig(GPIO_FullRemap_USART3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);//for UART4
//Configure RS485_TX_EN PIN
GPIO_InitStructure.GPIO_Pin = RS485_TX_EN_PIN; //PC9端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(RS485_TX_EN_PORT, &GPIO_InitStructure);
RS485_TX_EN=0; //设置485默认为接收模式
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &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(UART4, &USART_InitStructure);
//USART_Init(USART3, &USART_InitStructure);
/* Enable the USART */
USART_Cmd(UART4, ENABLE);
USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);//开启串口接受中断
USART_ClearFlag(UART4,USART_FLAG_TC);
}
//USART1查询接收到的数据
//buf:接收缓存首地址
//len:读到的数据长度
void UART4_Receive_Data(u8 *buf)
{
u8 rxlen=21;
u8 i=0;
delay_ms(10); //等待10ms,连续超过10ms没有接收到一个数据,则认为接收结束
RS485_RX_FLAG = 0;
if((UART4_RX_BUF[0]==0x01)&&(UART4_RX_BUF[1]==0x03))
{
for(i=0;iDR); //读取接收到的数据
UART4_RX_BUF[UART4_RX_CNT&0XFF]=Res; //回传的数据存入数组,0X3F限制为64个数值
UART4_RX_CNT++;
USART2_RX_STA=1;
}
if( USART_GetITStatus(UART4, USART_IT_TC) == SET )
{
USART_ClearFlag(UART4, USART_FLAG_TC);
}
//溢出-如果发生溢出需要先读SR,再读DR寄存器则可清除不断入中断的问题
if(USART_GetFlagStatus(UART4,USART_FLAG_ORE) == SET)
{
USART_ReceiveData(UART4);
USART_ClearFlag(UART4,USART_FLAG_ORE);
}
// USART_ITConfig(UART4, USART_IT_RXNE, DISABLE);//临时关闭接收中断
USART_ClearFlag(UART4,USART_IT_RXNE); //一定要清除接收中断
}
//初始化延迟函数
//SYSTICK的时钟固定为HCLK时钟的1/8
//SYSCLK:系统时钟
void Systick_delay_init(u8 SYSCLK)
{
SysTick->CTRL&=0xfffffffb;//bit2清空,选择外部时钟 HCLK/8
// SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //选择外部时钟 HCLK/8
fac_us=SYSCLK/8;
fac_ms=(u16)fac_us*1000;
}
/*===============================================================================
Author:peter pan
Date:
Description: 查询式分时或叫做轮询式（近似延时）。本函数是用于执行高效率场合的查询延时，但是一个for or while 循环中只能用一次。
revise Description:
@ num : //分时查询的周期计数值
@ unit : //分时查询的周期单位
@@ParaValue ：
MS //周期单位为MS毫秒级
US //周期单位为US微秒级
@ virtual_delay_status : //静态变量
@@ParaValue ：
SET //SYSTICK正在占用中，请勿用
RESET //SYSTICK空闲，可以使用
@ReValue :
with zero mean Time non-arrive ,one representative Time arrived ,you can do task;
##example if(virtual_delay(1000,MS)) LedFlash(); //1000ms LED闪烁一下
===============================================================================*/
u8 virtual_delay(u32 num,u8 unit)
{
u32 temp;
if(virtual_delay_status==RESET) // SYSTICK空闲，可以使用
{
if(unit==MS)
{
SysTick->LOAD=(u32)num*Delay_SYSCLK*125;//时间加载(SysTick->LOAD为24bit)
SysTick->VAL =0x00; //清空计数器
SysTick->CTRL=0x01 ; //开始倒数
}else if(unit==US)
{
SysTick->LOAD=num*Delay_SYSCLK/8; //时间加载
SysTick->VAL=0x00; //清空计数器
SysTick->CTRL=0x01 ; //开始倒数
}
virtual_delay_status=SET;
return 0;
}
else
{ //virtual_delay_status==SET SYSTICK被占用
temp=SysTick->CTRL;
if(!(temp&0x01&&!(temp&(1<<16))))//等待时间到达
{
SysTick->CTRL=0x00; //关闭计数器
SysTick->VAL =0X00; //清空计数器
virtual_delay_status=RESET;
return 1;
}else return 0;
}
}
原文地址：https://www.cnblogs.com/pertor/p/9488446.html
感谢原作者！