USART3
本帖最后由 ymzz 于 2020-12-21 20:03 编辑视频学习的是usart,使用的是usart1,但在stm32f103z500的板子上使用的是usart3,但是修改程序后串口还是无法传递信息
usart3模块代码:
void USART3_Init(u32 bound)
{ GPIO_InitTypeDefGPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDefNVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//TX
GPIO_InitStructure.GPIO_Mode= GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
//GPIO_SetBits(GPIOB,GPIO_Pin_10);
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_11;//RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
//GPIO_SetBits(GPIOB,GPIO_Pin_11);
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_Cmd(USART3,ENABLE);
USART_ClearFlag(USART3,USART_FLAG_TC);
USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //stm32f103.h 186
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void USART3_IRQHandler(void)
{ u8 r;
led1 = 0;
if(USART_GetITStatus(USART3,USART_IT_RXNE)!=RESET)
{
r = USART_ReceiveData(USART3);
USART_SendData(USART3,r);
while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);
}
USART_ClearFlag(USART3,USART_FLAG_TC);
}
主函数代码:
#include "SysTick.h"
#include "led.h"
#include "usart.h"
int main()
{
u8 i=0;
SysTick_Init(72);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
LEDB_Init();
USART3_Init(9600);
led2 = 1;
while(1)
{
i++;
if(i%20==0)
{
led2=!led2;
}
delay_ms(10);
}
}
本帖最后由 ymzz 于 2020-12-21 20:02 编辑
走过路过的大佬指点指点{:3_60:}{:3_60:}{:3_60:}
请问你解决了?我也是这个问题
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