bias 发表于 2014-10-30 13:09
没有，我没有用dma写flash，我刚刚尝试了一下，不行，直接死循环，不知道哪儿设置问题

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我的不会呀，就是错位，我发我的代码给你看看！#include "mcu_spi.h"
#include "stdio.h"

#define sFLASH_CS_LOW()      GPIO_ResetBits(GPIOA, GPIO_Pin_2)
#define sFLASH_CS_HIGH()      GPIO_SetBits(GPIOA, GPIO_Pin_2)

#define sFLASH_CMD_WRSR                0x01
#define sFLASH_CMD_WRITE         0x02  
#define sFLASH_CMD_READ                0x03
#define sFLASH_CMD_DISWR        0x04
#define sFLASH_CMD_RDSR                0X05
#define sFLASH_CMD_ENWR                0x06
#define sFLASH_DUMMY_BYTE        0xFF
#define sFLASH_CMD_BE                0xc7
#define sFLASH_CMD_SE                0xd8
#define sFLASH_CMD_RDID                0x9f

#define sFLASH_IDADDR                0x14

#define sFLASH_SPI_PAGESIZE        0x100 //one page 256 byte
#define sFLASH_W25X16_ID     0x3015

u8 Rvcbuf2[10];
u8 Sendbuf2[10]= {
0x01,0x02,0x03,0x04,
0x05,0x06,0x07,0x08,
0x09,0x0a
};
#define SPI_MASTER_DR_Base   0x4001300C       
DMA_InitTypeDef         DMA_InitStructure;

void SPI1_Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        SPI_InitTypeDef  SPI_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|
        RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO|
        RCC_APB2Periph_SPI1, ENABLE);
        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
          GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
          GPIO_Init(GPIOA , &GPIO_InitStructure);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  
          GPIO_Init(GPIOA, &GPIO_InitStructure);
        //spi enable pin
          GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
          GPIO_Init(GPIOA, &GPIO_InitStructure);


          DMA_DeInit(DMA1_Channel2);
          DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI_MASTER_DR_Base;
        DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Rvcbuf2;
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
          DMA_InitStructure.DMA_BufferSize = 0xffff;
          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_High;
          DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
          DMA_Init(DMA1_Channel2, &DMA_InitStructure);

            DMA_DeInit(DMA1_Channel3);  
            DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Sendbuf2;
            DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
            DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
            DMA_Init(DMA1_Channel3, &DMA_InitStructure);

        SPI_Cmd(SPI1, DISABLE);
        SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
          SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
          SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
          SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
          SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
          SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
          SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
          SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
          SPI_InitStructure.SPI_CRCPolynomial = 7;
          SPI_Init(SPI1, &SPI_InitStructure);
        SPI_Cmd(SPI1, ENABLE);

        SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
        SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);

        NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
          NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
          NVIC_Init(&NVIC_InitStructure);

          NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel3_IRQn;
          NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
          NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
          NVIC_Init(&NVIC_InitStructure);

        DMA_ITConfig(DMA1_Channel2,DMA_IT_TC,ENABLE);
        DMA_ITConfig(DMA1_Channel3,DMA_IT_TC,ENABLE);

        DMA_Cmd(DMA1_Channel2, DISABLE);
        DMA_Cmd(DMA1_Channel3, DISABLE);
}

u8 sFLASH_SendByte(u8 dat)
{
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
        SPI_I2S_SendData(SPI1,dat);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
        return SPI_I2S_ReceiveData(SPI1);
}

void sFLASH_WriteEnable(void)
{
  sFLASH_CS_LOW();

  sFLASH_SendByte(sFLASH_CMD_ENWR);

  sFLASH_CS_HIGH();
}

void sFLASH_WaitForWriteEnd(void)
{
  uint8_t flashstatus = 0;
  sFLASH_CS_LOW();

  sFLASH_SendByte(sFLASH_CMD_RDSR);
  do
  {
    flashstatus = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
  }
  while ((flashstatus & 0x01) == SET);
  sFLASH_CS_HIGH();
}

void Flash_WritePage(uint8_t* pBuffer, u32 WriteAddr, uint16_t NumByteToWrite)
{
    sFLASH_WriteEnable();
    sFLASH_WaitForWriteEnd();
    sFLASH_CS_LOW();
    sFLASH_SendByte(sFLASH_CMD_WRITE);
    sFLASH_SendByte((WriteAddr&0xFF0000)>>16);               
    sFLASH_SendByte((WriteAddr&0xFF00)>>8);
    sFLASH_SendByte(WriteAddr&0xFF);
//hard mode write
//    if(NumByteToWrite>256)
//    {
//       NumByteToWrite=256;            
//    }
//    while(NumByteToWrite--)
//    {                                                                                                                                         
//      sFLASH_SendByte(*pBuffer);
//       pBuffer++;
//    }
//DMA mode write
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)pBuffer;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;   
    DMA_InitStructure.DMA_BufferSize = NumByteToWrite;  
    DMA_Init(DMA1_Channel3, &DMA_InitStructure);
    SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
    DMA_Cmd(DMA1_Channel3,ENABLE);                                                          
}

u8 sFLASH_ReadByte(void)
{
  return (sFLASH_SendByte(sFLASH_DUMMY_BYTE));
}

//hard mode read
void sFLASH_ReadBuffer(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t NumByteToRead)
{
          sFLASH_CS_LOW();

          sFLASH_SendByte(sFLASH_CMD_READ);

          sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);

          sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);

          sFLASH_SendByte(ReadAddr & 0xFF);

          while (NumByteToRead--)
          {

                  *pBuffer++ = sFLASH_ReadByte();
          }
}

void  sFLASH_BulkErase(void)
{
    sFLASH_WriteEnable();
    sFLASH_WaitForWriteEnd();
    sFLASH_CS_LOW();
    sFLASH_SendByte(sFLASH_CMD_BE);               
    sFLASH_CS_HIGH();
    sFLASH_WaitForWriteEnd();
}

void DMA1_Channel2_IRQHandler(void)
{
       
        if(DMA_GetFlagStatus(DMA1_IT_TC2) != RESET)
        {
                DMA_ClearFlag(DMA1_IT_GL2);       
                DMA_Cmd(DMA1_Channel2, DISABLE);        }               
}

void DMA1_Channel3_IRQHandler(void)
{
       
        if(DMA_GetFlagStatus(DMA1_IT_TC3) != RESET)
        {
                DMA_ClearFlag(DMA1_IT_GL3);       
                DMA_Cmd(DMA1_Channel3, DISABLE);
        }               
}

void SPI_Flash_Check(void)
{
        Flash_WritePage((u8*)&Sendbuf2,0,10);   
        delay_ms(10);
        sFLASH_CS_HIGH();
        sFLASH_WaitForWriteEnd();
        sFLASH_ReadBuffer((u8*)&Rvcbuf2,0,10);
        delay_ms(100);
        LED_RED_FLASH();

        printf("Rvcbuf2[0]=: %x ",Rvcbuf2[0]);
           printf("Rvcbuf2[1]=: %x ",Rvcbuf2[1]);
        printf("Rvcbuf2[2]=: %x ",Rvcbuf2[2]);
           printf("Rvcbuf2[3]=: %x ",Rvcbuf2[3]);
        printf("Rvcbuf2[4]=: %x ",Rvcbuf2[4]);
           printf("Rvcbuf2[5]=: %x ",Rvcbuf2[5]);
        printf("Rvcbuf2[6]=: %x ",Rvcbuf2[6]);
           printf("Rvcbuf2[7]=: %x ",Rvcbuf2[7]);
        printf("Rvcbuf2[8]=: %x ",Rvcbuf2[8]);
           printf("Rvcbuf2[9]=: %x ",Rvcbuf2[9]);
}
打印信息：
rvc[0] ＝0xff
rvc[1] ＝0x01
rvc[2] ＝0x02
rvc[3] ＝0x03
rvc[4] ＝0x04
rvc[5] ＝0x05
rvc[6] ＝0x06
rvc[7] ＝0x07
rvc[8] ＝0x08
rvc[9] ＝0x0a
切换回硬件，不用DMA就正常了！