STM32F407串口通信

eieieiei · 发表于 2018-1-25 09:54:26

我按照教程配置库函数，发送数据，会是不是出现乱码，我以为是，没有接收完又再次发送数据的原因，我又下载例程，发现PC端接收到的数据还是乱码是什么原因啊？[mw_shl_code=c,true]void uart_init(u32 bound){
//GPIO¶Ë¿ÚÉèÖÃ
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //Ê¹ÄÜGPIOAÊ±ÖÓ
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//Ê¹ÄÜUSART1Ê±ÖÓ

//´®¿Ú1¶ÔÓ¦Òý½Å¸´ÓÃÓ³Éä
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9¸´ÓÃÎªUSART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10¸´ÓÃÎªUSART1

//USART1¶Ë¿ÚÅäÖÃ
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9ÓëGPIOA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´ÓÃ¹¦ÄÜ
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //ËÙ¶È50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //ÍÆÍì¸´ÓÃÊä³ö
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //ÉÏÀ
GPIO_Init(GPIOA,&GPIO_InitStructure); //³õÊ¼»&macr

A9£&not

A10

//USART1 ³õÊ¼»¯ÉèÖÃ
USART_InitStructure.USART_BaudRate = bound;//²¨ÌØÂÊÉèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8Î»Êý¾Ý¸ñÊ½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæÅ¼Ð£ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½
  USART_Init(USART1, &USART_InitStructure); //³õÊ¼»¯´®¿Ú1

  USART_Cmd(USART1, ENABLE);  //Ê¹ÄÜ´®¿Ú1

//USART_ClearFlag(USART1, USART_FLAG_TC);

#if EN_USART1_RX
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿ªÆôÏà¹ØÖÐ¶Ï

//Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//´®¿Ú1ÖÐ¶ÏÍ¨µÀ
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); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷¡¢

#endif

}

void USART1_IRQHandler(void)             //´®¿Ú1ÖÐ¶Ï·þÎñ³ÌÐò
{
u8 Res;
#if SYSTEM_SUPPORT_OS //Èç¹ûSYSTEM_SUPPORT_OSÎªÕæ£¬ÔòÐèÒªÖ§³ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //½ÓÊÕÖÐ¶Ï(½ÓÊÕµ½µÄÊý¾Ý±ØÐëÊÇ0x0d 0x0a½áÎ²)
{
Res =USART_ReceiveData(USART1);//(USART1->DR); //¶ÁÈ¡½ÓÊÕµ½µÄÊý¾Ý

if((USART_RX_STA&0x8000)==0)//½ÓÊÕÎ´Íê³É
{
if(USART_RX_STA&0x4000)//½ÓÊÕµ½ÁË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½ÓÊÕ´íÎó,ÖØÐÂ¿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;//½ÓÊÕÊý¾Ý´íÎó,ÖØÐÂ¿ªÊ¼½ÓÊÕ
}
}
}
  } [/mw_shl_code]
这是乱码的图片

eieieiei · 发表于 2018-1-25 09:54:27

解决了，当我把波特率设置为9600就没有乱码了，这是为什么呀？115200不行吗？

Noctis · 发表于 2018-1-25 09:58:15

你调用uart_init时传入的参数是115200吗？

Miracle223 · 发表于 2018-1-25 10:39:15

看看程序里波特率设置的对不对。。

eieieiei · 发表于 2018-1-25 14:24:53

Noctis 发表于 2018-1-25 09:58
你调用uart_init时传入的参数是115200吗？

嗯嗯主函数中设置的是115200波特率

eieieiei · 发表于 2018-1-25 14:28:36

Miracle223 发表于 2018-1-25 10:39
看看程序里波特率设置的对不对。。

[mw_shl_code=c,true]int main(void)
{

u8 t;
u8 len;
u16 times=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃÏµÍ³ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é2
delay_init(168); //ÑÓÊ±³õÊ¼»¯
uart_init(115200); //´®¿Ú³õÊ¼»¯²¨ÌØÂÊÎª115200
LED_Init();       //³õÊ¼»¯ÓëLEDÁ¬½ÓµÄÓ²¼þ½Ó¿Ú
while(1)
{
if(USART_RX_STA&0x8000)
{
len=USART_RX_STA&0x3fff;//µÃµ½´Ë´Î½ÓÊÕµ½µÄÊý¾Ý³¤¶È
printf("\r\nÄú·¢ËÍµÄÏûÏ¢Îª:\r\n");
for(t=0;t<len;t++)
{
USART_SendData(USART1, USART_RX_BUF[t]);       //Ïò´®¿Ú1·¢ËÍÊý¾Ý
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//µÈ´ý·¢ËÍ½áÊø
}
printf("\r\n\r\n");//²åÈë»»ÐÐ
USART_RX_STA=0;
}else
{
times++;
if(times%5000==0)
{
printf("\r\nALIENTEK Ì½Ë÷ÕßSTM32F407¿ª·¢°å ´®¿ÚÊµÑé\r\n");
printf("ÕýµãÔ×Ó@ALIENTEK\r\n\r\n\r\n");
}
if(times%200==0)printf("ÇëÊäÈëÊý¾Ý,ÒÔ»Ø³µ¼ü½áÊø\r\n");
if(times%30==0)LED0=!LED0;//ÉÁË¸LED,ÌáÊ¾ÏµÍ³ÕýÔÚÔËÐÐ.
delay_ms(10);
}
}
}[/mw_shl_code]