不知道怎么了，串口发不出数据了

支持者2400 · 发表于 2018-12-4 11:02:54

串口1接收16进制数据01 02 03 04 05，然后发送到串口助手中，但是接收到的都是00 00 00，这是什么情况？

支持者2400 · 发表于 2018-12-4 11:03:44

[mw_shl_code=applescript,true]void uart_init(u32 bound){
  //GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //ê1ÄüUSART1￡¬GPIOAê±Öó

//USART1_TX GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9

  //USART1_RX    GPIOA.103õê¼»ˉ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10

  //Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×óóÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷

//USART 3õê¼»ˉéèÖÃ

USART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂê
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8Î»êy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæÅ¼D￡ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·￠Ä￡ê½

  USART_Init(USART1, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
  USART_Cmd(USART1, ENABLE);                   //ê1Äü′®¿ú1

}

void USART1_IRQHandler(void)
{
   u8 res;

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) // ½óêÕμ½êy¾Y
{
      res =USART_ReceiveData(USART1); //¶áè¡½óêÕμ½μÄêy¾YUSART1->DR

   USART_SendData(USART1,res);

}
}[/mw_shl_code]

szczyb1314 · 发表于 2018-12-4 11:16:08

USART_SendData(USART1,res);后面要有判断数据发送完成的

支持者2400 · 发表于 2018-12-4 11:17:54

szczyb1314 发表于 2018-12-4 11:16
USART_SendData(USART1,res);后面要有判断数据发送完成的

void USART1_IRQHandler(void)
{
   u8 res;

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) // ½óêÕμ½êy¾Y
{
      res =USART_ReceiveData(USART1); //¶áè¡½óêÕμ½μÄêy¾YUSART1->DR

   USART_SendData(USART1,res);
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);

}
}
还是00