想做一个USART2与USART3通信的程序，不知为何不通

routedhust · 发表于 2020-11-10 22:56:54

板子：STM32精英板F103ZEUSART2_TX

A2
USART2_RX

A3
USART3_TX

B10
USART3_RX

B11

硬件连接：用杜邦线连接A2与B11，A3与B10

设想：2号口发送一个字节到3号口，3号口接收以后点亮LED1，并且发送一个字节到2号口，2号口同样接收到之后点亮LED0，再发送字节到3号口，依次循环
问题：好像进不了中断，在第一次发送数据到3号口时，没有进入3号口的中断，于是我下载到板子上，连好了线路，也不行
重写了usart.c：
u8 USART_RX_STA2=0;    //接收状态标记
u8 USART_RX_STA3=0;    //接收状态标记
void usart_init_2(u32 bound){
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);

//USART2_TX GPIOA.2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.2

//USART2_RX    GPIOA.3初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.3

//Usart2 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;       //中断设置也是在网上找了资料，不知道2号口和3号口设置同一个优先级对不对
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

USART_InitStructure.USART_BaudRate = bound;//串口波特率
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(USART2, &USART_InitStructure);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ClearFlag(USART2, USART_FLAG_TC);                //这一行与下一行是论坛里找到的，说是发送第一个字节会不成功，因此加上这一句，或者下面一句
//USART_ClearFlag(USART2, USART_FLAG_TC | USART_IT_RXNE);
USART_Cmd(USART2, ENABLE);
}

void usart_init_3(u32 bound){
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3|RCC_APB2Periph_GPIOB, ENABLE);

//UART3_TX GPIOB.10
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);//初始化GPIOC.12

//UART3_RX    GPIOB.11
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化

//Usart3 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

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(USART3, &USART_InitStructure);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
USART_ClearFlag(USART3, USART_FLAG_TC);
//USART_ClearFlag(USART3, USART_FLAG_TC | USART_IT_RXNE);
USART_Cmd(USART3, ENABLE);
}

void USART2_IRQHandler(void)
{
//中断处理程序
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
USART_RX_STA2 = 1;
delay_ms(200);
USART_SendData(USART3,0x1);                                           //这里发送一个字节0x1
while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);
//while(!(USART3->SR & USART_FLAG_TXE));
}
}

void USART3_IRQHandler(void)
{
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
{
USART_RX_STA3 = 1;
delay_ms(200);
USART_SendData(USART2,0x1);
while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);
//while(!(USART2->SR & USART_FLAG_TXE));
}
}

main.c程序很简单
#include "sys.h"
#include "uart.h"
#include "delay.h"
//#include "beep.h"
#include "led.h"
//#include "key.h"

int main(void)
{
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
usart_init_2(9600);                                 //波特率不敢设置太高
usart_init_3(9600);
LED_Init();

USART_SendData(USART3,0x0d);          //首先发送一个数据到3号口，免得两个口都没数据，进入循环等待
while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);
//while(!(USART3->SR & USART_FLAG_TXE));//等待数据寄存器为空，发送完毕

while(1)
{
if(USART_RX_STA2) //有数据到达uart2
{
LED0=0; //点亮LED0
USART_RX_STA2 = 0; //清除数据标记
delay_ms(200);
LED0=1;
}
if(USART_RX_STA3) //有数据到达uart3
{
LED1=0; //点亮LED1
USART_RX_STA3 = 0; //清除数据标记
delay_ms(200);
LED1=1;
}
}
}