stm32f207 UART驅動

    這兩天又調了F207的uart接口，把板上的uart5做成打印和輸入處理接口。

uart5.c:

#include "stm32f2xx.h"
#include <stdio.h>

#ifdef __GNUC__
  /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
     set to 'Yes') calls __io_putchar() */
  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */

void UART5_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable the USARTx Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* Enable GPIO clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);

    /* Enable UART clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE);//USART1,6ÓÃRCC_APB2PeriphClockCmd

    /* Connect PXx to USARTx_Tx*/
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_UART5);

    /* Connect PXx to USARTx_Rx*/
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource2, GPIO_AF_UART5);

    /* Configure USART Tx as alternate function  */
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* Configure USART Rx as alternate function  */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate            = 115200;
    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(UART5, &USART_InitStructure);

    USART_ITConfig(UART5, USART_IT_RXNE, ENABLE); //½ÓÊÕÖжÏʹÄÜ

    USART_Cmd(UART5, ENABLE);    
}

void UART5_SendByte(unsigned short Data)
{
    while (!(UART5->SR & USART_FLAG_TXE));
    
    UART5->DR = (Data & (uint16_t)0x01FF);  
}

void UART5_Write(u8* data, unsigned short len)
{
    unsigned short i;
    for (i=0; i<len; i++)
    {
        UART5_SendByte(data[i]);
    }
}


/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */
PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART */
  USART_SendData(UART5, (uint8_t) ch);

  /* Loop until the end of transmission */
  while (USART_GetFlagStatus(UART5, USART_FLAG_TC) == RESET)
  {}

  return ch;
}

stm32f2xx_it.c中的中斷處理，做了個echo功能：

void UART5_IRQHandler(void)
{
  if(USART_GetITStatus(EVAL_COM1, USART_IT_RXNE) != RESET)
  {
      unsigned char tmp = USART_ReceiveData(EVAL_COM1);
      USART_SendData(EVAL_COM1, tmp);
  }
}