lao，我这边串口助手检测到了USB-SERIAL CH340(COM3)

木偶人的感情 · 发表于 2020-4-28 15:47:46

老哥们，我这边串口助手检测到了USB-SERIAL CH340(COM3)，然后我的串口调试助手配置STM32的USART1的波特率，校验位，停止位。打开串口。还是收不到STM32的打印消息。

int fputc(int ch, FILE *f)
{

正点原子 · 发表于 2020-4-28 15:47:47

木偶人的感情发表于 2020-4-29 09:26
老哥，我自发自收没问题。就是一连接单片机的板子就收不到消息了。

那是你单片机问题，检查代码问题

木偶人的感情 · 发表于 2020-4-28 15:51:19

int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (uint8_t) ch);

while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}

return ch;
}
//int GetKey (void)  {

// while (!(USART1->SR & USART_FLAG_RXNE));

// return ((int)(USART1->DR & 0x1FF));
//}

#if EN_USART1_RX //èç1ûê1ÄüáË½óêÕ
//′®¿ú1ÖD¶Ï·tÎñ3ìDò
//×￠òa,¶áè¡USARTx->SRÄü±üÃaÄaÃûÆäÃîμÄ′íÎó
u8 USART_RX_BUF[USART_REC_LEN];    //½óêÕ»o3å,×î′óUSART_REC_LEN¸ö×Ö½ú.
//½óêÕ×′ì¬
//bit15￡¬ ½óêÕíê3é±êÖ¾
//bit14￡¬ ½óêÕμ½0x0d
//bit13~0￡¬ ½óêÕμ½μÄóDD§×Ö½úêyÄ¿
u16 USART_RX_STA=0;    //½óêÕ×′ì¬±ê¼Ç

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 PA.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);

//USART1_RX    PA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure);

//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;//ò»°ãéèÖÃÎa9600;
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′®¿ú
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿aÆôÖD¶Ï
USART_Cmd(USART1, ENABLE);                   //ê1Äü′®¿ú

}

void USART1_IRQHandler(void)             //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
#ifdef OS_TICKS_PER_SEC      //èç1ûê±Öó½úÅÄêy¶¨òåáË,ËμÃ÷òaê1óÃucosIIáË.
OSIntEnter();
#endif
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(USART1);//(USART1->DR); //¶áè¡½óêÕμ½μÄêy¾Y

if((USART_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½óêÕ′íÎó,ÖØDÂ¿aê¼
else USART_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1Ã»êÕμ½0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//½óêÕêy¾Y′íÎó,ÖØDÂ¿aê¼½óêÕ
}
}
}
   }
#ifdef OS_TICKS_PER_SEC      //èç1ûê±Öó½úÅÄêy¶¨òåáË,ËμÃ÷òaê1óÃucosIIáË.
OSIntExit();
#endif
}
#endif

int main(void)
{
u8 dir=1;
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart_init(115200);
Init_LEDpin();
TIM4_PWM_Init(799,0);
   SHT2x_Init();
while(1)
{
   delay_ms(10);
      if(dir) ledOpwmval++;
      else ledOpwmval--;

      if(ledOpwmval>799) dir = 0;
      if(ledOpwmval==0) dir = 1;
      TIM_SetCompare3(TIM4,ledOpwmval);

   printf("SHT20 TEMP IS ....");
}

}