求stm32f407大神搭救新手

夜梦寒 · 发表于 2016-2-3 23:51:31

我想用串口2实现自发自收，调试了好久都没成功，看了些例程，配置没错啊，各路大神指导下吧

#include "stm32f4xx.h"
void Usart_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //GPIOAòy½Åê±Öóê1Äü
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE); //′®¿ú2ê±Öóê1Äü

GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //PA2éèÖÃÎa′®¿ú2¸′óÃ
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //PA3éèÖÃÎa′®¿ú2¸′óÃ

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2|GPIO_Pin_3; //PA2￡&#172

A3òy½Å3õê¼»ˉ
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF ; //éèÖÃÎaòy½Å¸′óÃ
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz; //òy½ÅËùÂêÎa50MHz
GPIO_InitStructure.GPIO_OType= GPIO_OType_PP ; //íÆíì
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP; //éÏà-
GPIO_Init(GPIOA,&GPIO_InitStructure); //GPIOAòy½Å3õê¼»ˉ

USART_InitStructure.USART_BaudRate=9600; //2¨ìØÂêéèÖÃÎa9600
USART_InitStructure.USART_WordLength=USART_WordLength_8b; //8Î»×Ö3¤
USART_InitStructure.USART_StopBits=USART_StopBits_1 ;    //ò»Î»í￡Ö1Î»
USART_InitStructure.USART_Parity=USART_Parity_No ; //ÎTÆæÅ¼D￡Ñé
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx; //êÕ·￠Ä￡ê½
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None; //ÎTó2¼tá÷
USART_Init(USART2,&USART_InitStructure); //′®¿ú3õê¼»ˉ

NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQn;       //ÖD¶Ïí¨μàÎa′®¿ú2
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;       //ÖD¶Ïí¨μàê1Äü
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1; //ÖD¶ÏÇàÕ¼óÅÏè¼¶Îa1
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1; //ÖD¶ÏÏìó|óÅÏè¼¶Îa1
NVIC_Init(&NVIC_InitStructure);       //ÖD¶Ï3õê¼»ˉoˉêy

USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);             //′®¿úÖD¶Ïê1Äüoˉêy
USART_Cmd(USART2,ENABLE); //′®¿ú2ê1Äü
}

void USART2_IRQHandler(void)                               //ÖD¶Ï·tÎñoˉêy
{
u8 res;
if(USART_GetITStatus(USART2,USART_IT_RXNE))
{
res=USART_ReceiveData(USART2);
USART_SendData(USART2,res);
}
}

int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
Usart_Init();
while(1);

}

夜梦寒 · 发表于 2016-2-3 23:51:32

问题已解决，是串口2的TX,RX没接到USB上对应的RX,TX上导致数据收不到

xuande · 发表于 2016-2-4 08:33:45

哪条语句在发送？
没看到有发送语句。

夜梦寒 · 发表于 2016-2-4 11:46:56

void USART2_IRQHandler(void)                               //ÖD¶Ï·tÎñoˉêy
{
      u8 res;
      if(USART_GetITStatus(USART2,USART_IT_RXNE))
      {
            res=USART_ReceiveData(USART2);
            USART_SendData(USART2,res);
      }
}
这就是啊，想要实现在串口助手上发送，接收后并显示在串口助手上