iar中使用DMA+printf+uart1

前段时间成功地重定向串口发送功能到系统printf函数上，

printf("《你的名字》: %s",Name);

用起来感觉真爽，但就是太占资源了，于是就想用DMA方式发送数据，但又想要printf的便捷性，于是找到了下面这篇文章

http://blog.cechina.cn/ting123/222234/message.aspx

虽然演示的是IAR上的代码，但其实就是定义了一个可变参数的函数，把发送的数据整合到数组，再用DMA发送。稍微修改就可以放MDK上用了。

//main.c

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "stdio.h"
#include "VarData.h"
#include "stdarg.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USART1_DR_Base  0x40013804
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#define SENDBUFF_SIZE   10240
u8 SendBuff[SENDBUFF_SIZE];
vu8 RecvBuff[10];
vu8 recv_ptr;
u32 DMA1_4 = RESET;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void DMA_Configuration(u8 *uiSendBuf,u32 uiLength);
void USART1_Configuration(void);
void Delay(void);
int printf(const char *format ,... )
{
 va_list arg;
    int rv;
 while(DMA1_4 == SET);
    va_start(arg, format);
    rv = vsprintf(SendBuff, format, arg);
    va_end(arg);
    DMA_Configuration(SendBuff,rv);
 //开始一次DMA传输！
    DMA_Cmd(DMA1_Channel4, ENABLE);
 LEDRUN(LAMP_ON);
return rv;
}
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
    u16 i;
#ifdef DEBUG
    debug();
#endif
    recv_ptr = 0;

    RCC_Configuration();
    GPIO_Configuration();
    NVIC_Configuration();

    USART1_Configuration();
    for(i=0;i<SENDBUFF_SIZE;i++)
    {
        SendBuff[i] = i&0xff;
    }
    //printf("Initial success!\r\nWaiting for transmission...\r\n");
    //发送去数据已经准备好，按下按键即开始传输
   // while(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_3));

   // printf("Start DMA transmission!\r\n");

    //这里是开始DMA传输前的一些准备工作，将USART1模块设置成DMA方式工作
    USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
 /* Enable DMA1 Channel4 */
    DMA_Cmd(DMA1_Channel4, ENABLE);


    printf("Initial success!\r\nWaiting for transmission %d ...\r\n",i);

    //DMA传输结束后，自动关闭了DMA通道，而无需手动关闭
    //下面的语句被注释
    //DMA_Cmd(DMA1_Channel4, DISABLE);

    printf("\r\nDMA transmission successful!\r\n");

    /* Infinite loop */
    while (1)
    {
      printf("\r\nDMA transmission successful!successful,successful,successful\r\n");
    }
}

/*******************************************************************************
* Function Name  : Delay
* Description    : 延时函数
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void Delay(void)
{
    u32 i;
    for(i=0;i<0xF0000;i++);
    return;
}
/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : 系统时钟设置
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
    ErrorStatus HSEStartUpStatus;
    //使能外部晶振
    RCC_HSEConfig(RCC_HSE_ON);
    //等待外部晶振稳定
    HSEStartUpStatus = RCC_WaitForHSEStartUp();
    //如果外部晶振启动成功，则进行下一步操作
    if(HSEStartUpStatus==SUCCESS)
    {
        //设置HCLK（AHB时钟）=SYSCLK
        RCC_HCLKConfig(RCC_SYSCLK_Div1);
        //PCLK1(APB1) = HCLK/2
        RCC_PCLK1Config(RCC_HCLK_Div2);
        //PCLK2(APB2) = HCLK
        RCC_PCLK2Config(RCC_HCLK_Div1);
        //FLASH时序控制
        //推荐值：SYSCLK = 0~24MHz   Latency="0"
        //        SYSCLK = 24~48MHz  Latency="1"
        //        SYSCLK = 48~72MHz  Latency="2"
        FLASH_SetLatency(FLASH_Latency_2);
        //开启FLASH预取指功能
        FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
        //PLL设置 SYSCLK/1 * 9 = 8*1*9 = 72MHz
        RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
        //启动PLL
        RCC_PLLCmd(ENABLE);
        //等待PLL稳定
        while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
        //系统时钟SYSCLK来自PLL输出
        RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
        //切换时钟后等待系统时钟稳定
        while(RCC_GetSYSCLKSource()!=0x08);

        /*
        //设置系统SYSCLK时钟为HSE输入
        RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
        //等待时钟切换成功
        while(RCC_GetSYSCLKSource() != 0x04);
        */
    }
    //下面是给各模块开启时钟
    //启动GPIO
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | \
                           RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD,\
                           ENABLE);
    //启动AFIO
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    //启动USART1
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    //启动DMA时钟
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : GPIO设置
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    /*板上LED控制*/
    /* Configure PC.2 and PC.3 as output OD for LED 
    General purpose output Open-drain*/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    //USART1_TX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //USART1_RX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : NVIC设置
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
#ifdef  VECT_TAB_RAM
    // Set the Vector Table base location at 0x20000000
    NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
    // Set the Vector Table base location at 0x08000000
    NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
    //设置NVIC优先级分组为Group2：0-3抢占式优先级，0-3的响应式优先级
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    //串口接收中断打开    
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
   /* Enable the DMA Channel 1 Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

}

/*******************************************************************************
* Function Name  : USART1_Configuration
* Description    : NUSART1设置
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void USART1_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;

    USART_InitStructure.USART_BaudRate = 9600;
    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_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

    USART_Cmd(USART1, ENABLE);
}

void DMA_Configuration(u8 *uiSendBuf,u32 uiLength)
{
    DMA_InitTypeDef DMA_InitStructure;
    //DMA设置：
    //设置DMA源：内存地址&串口数据寄存器地址
    //方向：内存-->外设
    //每次传输位：8bit
    //传输大小DMA_BufferSize=SENDBUFF_SIZE
    //地址自增模式：外设地址不增，内存地址自增1
    //DMA模式：一次传输，非循环
    //优先级：中
    DMA_DeInit(DMA1_Channel4);
    DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)uiSendBuf;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    DMA_InitStructure.DMA_BufferSize = uiLength;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel4, &DMA_InitStructure);
  /* Enable Channel5 Transfer complete interrupt */
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE); 
}
中断：
/*******************************************************************************
* Function Name  : DMA1_Channel4_IRQHandler
* Description    : This function handles DMA1 Channel 4 interrupt request.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void DMA1_Channel4_IRQHandler(void)
{
 if(DMA_GetITStatus(DMA1_IT_TC4))
      {
  DMA_ClearITPendingBit(DMA1_IT_TC4);
   LEDRUN(LAMP_OFF);
 }
 if(DMA_GetITStatus(DMA1_IT_HT4))
      {
  DMA_ClearITPendingBit(DMA1_IT_HT4);
 }
 if(DMA_GetITStatus(DMA1_IT_TE4))
      {
  DMA_ClearITPendingBit(DMA1_IT_TE4);
 }
 if(DMA_GetITStatus(DMA1_IT_GL4))
      {
  DMA_ClearITPendingBit(DMA1_IT_GL4);
 }
}