奇怪的串口程序，请看一楼二楼，求解；

1楼-- · 2019-08-22 17:05

就像下面的这个程序就不能正常执行了；

#include "stm32f10x.h"
void tim5_init(u16 cout,u16 pre,u32 bound)
{
GPIO_InitTypeDef GPIO_Initstrue;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitstrue;
TIM_ICInitTypeDef TIM_ICInitstrue;
USART_InitTypeDef USART_Initstrue;//
NVIC_InitTypeDef NVIC_Initstrue;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE); //开定时器5时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);//开GPIO,USART1时钟

GPIO_Initstrue.GPIO_Mode=GPIO_Mode_IPD; //PA.0下拉；
GPIO_Initstrue.GPIO_Pin=GPIO_Pin_0;
GPIO_Initstrue.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_Initstrue);

GPIO_Initstrue.GPIO_Mode=GPIO_Mode_AF_PP; //PA.9复用输出；
GPIO_Initstrue.GPIO_Pin=GPIO_Pin_9;
GPIO_Initstrue.GPIO_Speed=GPIO_Speed_50MHz;//
GPIO_Init(GPIOA,&GPIO_Initstrue);

GPIO_Initstrue.GPIO_Mode=GPIO_Mode_IN_FLOATING; //PA.10浮动输入；
GPIO_Initstrue.GPIO_Pin=GPIO_Pin_10;
GPIO_Initstrue.GPIO_Speed=GPIO_Speed_50MHz;//
GPIO_Init(GPIOA,&GPIO_Initstrue);

TIM_TimeBaseInitstrue.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInitstrue.TIM_Period=cout;
TIM_TimeBaseInitstrue.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitstrue.TIM_Prescaler=pre;
TIM_TimeBaseInit(TIM5,&TIM_TimeBaseInitstrue); //定时器5初始化；

TIM_ICInitstrue.TIM_Channel=TIM_Channel_1;
TIM_ICInitstrue.TIM_ICFilter=0X00;
TIM_ICInitstrue.TIM_ICPolarity=TIM_ICPolarity_Rising;
TIM_ICInitstrue.TIM_ICPrescaler=TIM_ICPSC_DIV1;
TIM_ICInitstrue.TIM_ICSelection=TIM_ICSelection_DirectTI; //捕获输入初始化；
TIM_ICInit(TIM5,&TIM_ICInitstrue);

USART_Initstrue.USART_BaudRate=bound;
USART_Initstrue.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_Initstrue.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
USART_Initstrue.USART_Parity=USART_Parity_No;
USART_Initstrue.USART_StopBits=USART_StopBits_1;
USART_Initstrue.USART_WordLength=USART_WordLength_8b; //USART1初始化
USART_Init(USART1,&USART_Initstrue);

TIM_ITConfig(TIM5,TIM_IT_Update,ENABLE);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);//

NVIC_Initstrue.NVIC_IRQChannel=TIM5_IRQn;
NVIC_Initstrue.NVIC_IRQChannelCmd=ENABLE;
NVIC_Initstrue.NVIC_IRQChannelPreemptionPriority=3; //中断优先级
NVIC_Initstrue.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_Initstrue);

NVIC_Initstrue.NVIC_IRQChannel=USART1_IRQn;
NVIC_Initstrue.NVIC_IRQChannelCmd=ENABLE;
NVIC_Initstrue.NVIC_IRQChannelPreemptionPriority=2; //中断优先级
NVIC_Initstrue.NVIC_IRQChannelSubPriority=2;
NVIC_Init(&NVIC_Initstrue);

TIM_Cmd(TIM5,ENABLE);
USART_Cmd(USART1,ENABLE);

}

void USART1_IRQHandler(void) //串行中断服务程序
{
u16 res;
if(USART_GetITStatus(USART1,USART_IT_RXNE))
{
res=USART_ReceiveData(USART1);
USART_SendData(USART1,res);
}
}

int main()
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
tim5_init(299,7199,115200);
while(1);
}