MCU:STM32F334C8T6
Frameware:STM32F3348-Discovery_FW_V1.0.0
实现功能:
在PC使用串口调试助手向MCU发送字符(数据),MCU将接收到的字符发回PC
代码:
#include "main.h"
int main()
{
GPIO_Config();
USART_Config();
NVIC_Config();
while(1);
}
void GPIO_Config()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_3 | GPIO_Pin_4); //USART2对应的RX,TX引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//配置复用功能
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_7);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_7);
}
void USART_Config()
{
USART_InitTypeDef USART_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
USART_DeInit(USART2);
USART_InitStructure.USART_BaudRate = 115200;
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);//使能中断
USART_ClearFlag (USART2,USART_FLAG_TC);
USART_Cmd(USART2, ENABLE); //打开串口
}
void NVIC_Config()
{
NVIC_InitTypeDef NVIC_InitStruct;
#ifdef VECT_TAB_SRAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //一定要设置中断向量表,否则可能出错
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStruct.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}
//中断处理函数
void USART2_IRQHandler (void)
{
if (USART_GetFlagStatus(USART2,USART_FLAG_RXNE) ==SET)
{
USART_SendData(USART2,USART_ReceiveData(USART2));//发送接收到的数据
while (!USART_GetFlagStatus(USART2,USART_FLAG_TC));
}
USART_ClearITPendingBit(USART2,USART_IT_RXNE);//清中断标志位
}
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