stm_units/app/DMA/UART_DMA.C

#include "UART_DMA.h"

uint8_t TxBufferUart[256] = { 0 };
uint8_t RxBufferUart[256] = { 0 };
__IO uint8_t TxCounterUart = 0x00;
__IO uint8_t RxCounterUart = 0x00;
uint8_t UartSendCount = 0;

/*******************************************************************************
* Function Name  : USART_Configuration
* Description    : Configure USART1
* Input          : None
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
void ConfigurationUsart1 ( void )
{
#if UART1_SD_def
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    //使能USART1/GPIO 时钟可配置
    Wifi_RCC_GPIO_CONFIG();
    Wifi_RCC_UART_CONFIG();
    /*
    *  USART1_TX -> PA9 , USART1_RX ->	PA10
    */
    GPIO_InitStructure.GPIO_Pin = Wifi_Tx;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init ( Wifi_GPIO, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = Wifi_Rx;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init ( Wifi_GPIO, &GPIO_InitStructure );

    USART_InitStructure.USART_BaudRate = Wifi_UART_BAUD;
    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 ( Wifi_UART, &USART_InitStructure );

    //USART_ITConfig ( Wifi_UART, USART_IT_RXNE, ENABLE );
    //USART_ITConfig ( Wifi_UART, USART_IT_TXE, DISABLE );

    USART_Cmd ( Wifi_UART, ENABLE );
#endif
}
//系统中断管理
void NVIC_ConfigurationUSART1 ( void )
{
    NVIC_InitTypeDef NVIC_InitStructure;
    /* Configure the NVIC Preemption Priority Bits */
    NVIC_PriorityGroupConfig ( Wifi_NVIC_Group );

    /* Enable the USARTy Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = Wifi_NVIC_Interrupt;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = Wifi_NVIC_Pre;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = Wifi_NVIC_Sub;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init ( &NVIC_InitStructure );
}

void UartSend ( char *buffer, int nBytes )
{
    // Wait for previous xmt to complete
    while ( TxCounterUart < UartSendCount );

    // Setup next XMT
    memcpy ( TxBufferUart, buffer, nBytes );
    TxCounterUart = 0;
    UartSendCount = nBytes;

    USART_ITConfig ( USART1, USART_IT_TXE, ENABLE );
}