STM32F4串口4标准库程序的问题

chenbingjy

有一个板子，STM32F407VET6，串口4接在PC10和PC11上。

我用标准库写了个程序，通讯不上。
初始化代码如下：

//3õê¼»ˉIO ′®¿ú4
//bound:2¨ìØÂê
void uart_init(u32 bound){
   //GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE); //ê1ÄüGPIOCê±Öó
RCC_APB2PeriphClockCmd(RCC_APB1Periph_UART4,ENABLE);//ê1ÄüUART4ê±Öó

//′®¿ú1¶Ôó|òy½Å¸′óÃó3éä
GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_UART4); //GPIOC10¸′óÃÎaUART4
GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_UART4); //GPIOC11¸′óÃÎaUART4
//USART1¶Ë¿úÅäÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_10; //GPIOC11óëGPIOC10
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(GPIOC,&GPIO_InitStructure); //3õê¼»ˉPC11￡&#172C10

   //USART1 3õê¼»ˉéèÖÃ
USART_InitStructure.USART_BaudRate = bound;//2¨ìØÂêéèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8λêy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λ
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæżD￡Ñéλ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·￠Ä￡ê½
  USART_Init(UART4, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
  USART_Cmd(UART4, ENABLE);  //ê1Äü′®¿ú1
USART_ClearFlag(UART4, USART_FLAG_TC);
//#if EN_USART1_RX
// USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);//¿aÆôÏà1ØÖD¶Ï

// //Usart1 NVIC ÅäÖÃ
//  NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;//′®¿ú1ÖD¶Ïí¨μà
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//ÇàÕ¼óÅÏ輶3
// NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //×óóÅÏ輶3
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
// NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷¡￠

//#endif
}
开始我用中断，不行，后来又改成查询，都不行。
中断程序：
void UART4_IRQHandler(void)                 //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
#if SYSTEM_SUPPORT_OS  //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();   
#endif
if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(UART4);//(UART4->DR); //¶á衽óêÕμ½μÄêy¾Y
if((USART_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½óêÕ′íÎó,ÖØD¿aê¼
else USART_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1ûêÕμ½0X0D
{
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,ÖØD¿aê¼½óêÕ   
}  
}
}     
  }
#if SYSTEM_SUPPORT_OS  //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();   
#endif
}
查询代码：
while (USART_GetFlagStatus(UART4, USART_FLAG_RXNE) == RESET);
data=USART_ReceiveData(UART4);
请大神看看，如何修改代码？谢谢！

peng1554

可以参考附件UART4的初始化

chenbingjy

有人说要用GPIO_PinRemapConfig()这个函数，可是我不太清楚如何用。
百度搜到，GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
还是不知道怎么用。说是PA0,PA1映射到PC10,PC11上。

宇智波白

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