UART接收發(fā)送數(shù)據(jù)：

平臺(tái)：STM32F401 discovery版

此代碼用的UART6，TX,RX對(duì)應(yīng)的PIN腳是PC6，PC7

如圖：

步驟一：初始化串口的GPIO，USART,并且配置上UART的RX中斷

voidUSART6_Config(void)

{

USART_InitTypeDefUSART_InitStructure;

NVIC_InitTypeDefNVIC_InitStructure;

GPIO_InitTypeDefGPIO_InitStructure;

/*EnableGPIOclock*/

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);

/*EnableUSARTclock*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6,ENABLE);

/*ConnectUSARTpinsto*/

GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_USART6);

GPIO_PinAFConfig(GPIOC,GPIO_PinSource7,GPIO_AF_USART6);

/*ConfigureUSARTTxandRxasalternatefunctionpush-pull*/

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//GPIO_Speed_100MHz;

GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6;

GPIO_Init(GPIOC,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;

GPIO_Init(GPIOC,&GPIO_InitStructure);

/*USARTxconfiguration----------------------------------------------------*/

USART_InitStructure.USART_BaudRate=115200;//5250000;

USART_InitStructure.USART_WordLength=USART_WordLength_8b;

USART_InitStructure.USART_StopBits=USART_StopBits_1;

USART_InitStructure.USART_Parity=USART_Parity_No;

USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;

USART_Init(USART6,&USART_InitStructure);

/*EnabletheUSARTxInterrupt*/

NVIC_InitStructure.NVIC_IRQChannel=USART6_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);

USART_ITConfig(USART6,USART_IT_RXNE,ENABLE);

USART_Cmd(USART6,ENABLE);

}

步驟二：測(cè)試一下TX,即用printf,但是printf內(nèi)部是調(diào)用fputs，所以需要重定向一下

intfputc(intch,FILE*f)

{

USART_SendData(USART6,(unsignedchar)ch);

while(!(USART6->SR&USART_FLAG_TXE));

return(ch);

}

intfgetc(FILE*f)

{

while(USART_GetFlagStatus(USART6,USART_FLAG_RXNE)==RESET);

return(int)USART_ReceiveData(USART6);

}

步驟三：編寫(xiě)RX中斷函數(shù)

[cpp]view plaincopy

voidUSART6_IRQHandler(void)

{

uint8_tch;

if(USART_GetITStatus(USART6,USART_IT_RXNE)!=RESET)

{

ch=USART_ReceiveData(USART6);

printf("%cn",ch);

}

}

注意地方：使用的IAR，沖定向的時(shí)候出現(xiàn)FILE類型找不到，可是在C原因中#include ,但是為什么還是報(bào)錯(cuò)呢？

追代碼發(fā)現(xiàn)：

#if _DLIB_FILE_DESCRIPTOR
typedef _Filet FILE;
#endif /* _DLIB_FILE_DESCRIPTOR */

_DLIB_FILE_DESCRIPTOR宏是0，但是IAR又不讓修改，所以肯定是哪里的lib沒(méi)有配置，于是找到如圖就搞定了

附一張板子圖：

用標(biāo)準(zhǔn)的杜邦線連接

整個(gè)工程如連接：

http://download.csdn.net/detail/xiaoxiaopengbo/9425422