AT45DB161 DMA方试读写部分代码

发布于 2010-02-25 20:57:17 浏览：4183 订阅该版

AT45DB161 DMA方试读写部分代码:

```
/* set Page (12Bit) and Byte Address (10Bit) */
/* 2 res.bits + 6 bits of 12-bit page-address */
#define ADR_P_B_1(page)				(u8)(page>>6)
/* 6 bit page-address and 2bit Byte-address */
#define ADR_P_B_2(page, address)	(u8)(page<<2)|(address>>8)
/* 8 bit Byte-address */
#define ADR_P_B_3(address)		    (u8)address

/*******************************************************************************
* Function Name : store_waitBusy
* Description   : 存储器: 等待Flash空闲
*
* Input         : None
* Output        : None
* Return        : None
*******************************************************************************/
void store_waitBusy(void)
{
    u8 state_reg=0x00;
    store_init_spiMode();   /*进入SPI模式*/
    store_selectFlash(FALSE, TRUE);
    store_selectFlash(TRUE, TRUE);
    store_spi_sendByte(DEF_FLASH_OP_STATUS);
    while((state_reg&0x80) == 0)
    {		
        state_reg = store_spi_readByte();
    }
    store_selectFlash(FALSE, FALSE);
    store_init_dmaMode();   /*进入DMA模式*/

}

/*******************************************************************************
* Function Name : store_selectFlash
* Description   : 存储器:选中Flash
*
* Input         : bSelect :选中或释放, bLock :锁定或释放
* Output        : None
* Return        : None
*******************************************************************************/
void store_selectFlash(bool bSelect, bool bLock)
{
    if (TRUE == bSelect)
    {
        if (TRUE == bLock)
        {/*试图获得 g_stortState 互斥锁*/
            rt_mutex_take(&g_stortState, RT_WAITING_FOREVER);
        } 
        /*选中Flash*/
        GPIO_ResetBits(FLASH_GPIO, FLASH_CS_PIN);
    } 
    else
    {
        if (FALSE == bLock)
        {/* 释放 g_stortState 互斥锁*/
            rt_mutex_release(&g_stortState);
        }
        /*释放Flash*/
        GPIO_SetBits(FLASH_GPIO, FLASH_CS_PIN);
    }

}

/*******************************************************************************
* Function Name  : store_init_dmaMode
* Description    : Initializes the peripherals used by the DMA FLASH driver.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void store_init_dmaMode(void)
{
    SPI_InitTypeDef  SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

/* Enable SPI1 GPIOA and GPIOB clocks */
    RCC_APB2PeriphClockCmd(FLASH_SPI_RCC | FLASH_RCC, ENABLE);

/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */
    GPIO_InitStructure.GPIO_Pin = FLASH_SCK_PIN | FLASH_MISO_PIN | FLASH_MOSI_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(FLASH_GPIO, &GPIO_InitStructure);

/* Configure PB.02 as Output push-pull, used as Flash Chip select */
    GPIO_InitStructure.GPIO_Pin = FLASH_CS_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Deselect the FLASH: Chip Select high */
    store_selectFlash(FALSE, TRUE);

/* SPI1 configuration */ 
    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_2;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(FLASH_SPI_X, &SPI_InitStructure);

/* Enable FLASH_SPI_X Rx buffer DMA transfer request */
    SPI_I2S_DMACmd(FLASH_SPI_X, SPI_I2S_DMAReq_Rx | SPI_I2S_DMAReq_Tx,ENABLE);

/* Enable FLASH_SPI_X  */
    SPI_Cmd(FLASH_SPI_X, ENABLE);

}

/*******************************************************************************
* Function Name : store_dma_rx_init
* Description   : 存储器:DMA方式读
*
* Input         : nSize :大小
* Output        : pData :目的数据地址
* Return        : None
*******************************************************************************/
void store_dma_rx_init(u8* pData, u32 nSize)
{
#define TEMP_SIZE   50
    DMA_InitTypeDef DMA_InitStructure;
    u32 nloop = 0;
    u8 temp[TEMP_SIZE];

DMA_DeInit(DMA1_Channel2);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&FLASH_SPI_X->DR);
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)pData;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = nSize;
    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);
    //配置完成后，启动DMA通道
    //DMA_ITConfig(DMA1_Channel3,DMA1_FLAG_TC3,ENABLE);
    DMA_ClearFlag(DMA1_FLAG_TC2|DMA1_FLAG_GL2|DMA1_FLAG_HT2|DMA1_FLAG_TE2);//清标志位
    DMA_Cmd(DMA1_Channel2, ENABLE);
    DMA_Cmd(DMA1_Channel2, DISABLE);

DMA_DeInit(DMA1_Channel2);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&FLASH_SPI_X->DR);
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)pData;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = nSize;
    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_ClearFlag(DMA1_FLAG_TC2|DMA1_FLAG_GL2|DMA1_FLAG_HT2|DMA1_FLAG_TE2);//清标志位
    DMA_Cmd(DMA1_Channel2, ENABLE);
    for (nloop = 0;nloop<(nSize/TEMP_SIZE);nloop++)
    {
        store_dma_tx_init(temp, TEMP_SIZE);
    }
    if ((nSize%TEMP_SIZE) > 0)
    {
        store_dma_tx_init(temp,(nSize%TEMP_SIZE));
    }
    while(RESET == DMA_GetFlagStatus(DMA1_FLAG_TC2));
    DMA_Cmd(DMA1_Channel2, DISABLE);
}

/*******************************************************************************
* Function Name : store_dma_tx_init
* Description   : 存储器:DMA方式写
*
* Input         : nSize :大小
* Output        : pData :源数据地址
* Return        : None
*******************************************************************************/
void store_dma_tx_init(u8* pData, u32 nSize)
{
    DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel3);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&FLASH_SPI_X->DR);
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)pData; 
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    DMA_InitStructure.DMA_BufferSize = nSize;
    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_Channel3, &DMA_InitStructure);
    //配置完成后，启动DMA通道 
    //DMA_ITConfig(DMA1_Channel3,DMA1_FLAG_TC3,ENABLE);
    DMA_ClearFlag(DMA1_FLAG_TC3|DMA1_FLAG_GL3|DMA1_FLAG_HT3|DMA1_FLAG_TE3);//清标志位
    DMA_Cmd(DMA1_Channel3, ENABLE); 
    while(RESET == DMA_GetFlagStatus(DMA1_FLAG_TC3));
    DMA_Cmd(DMA1_Channel3, DISABLE);

}

/*******************************************************************************
* Function Name : store_read
* Description   : 存储器读
*                  
* Input         : nAddr :Flash地址
*               : nSize :大小
*
* Output        : pData :数据指针
* Return        : true or false
*******************************************************************************/
bool store_read(const u32 nAddr, const u32 nSize, void* pData)
{
    u16 i = 0;
    u32 page = nAddr / DEF_FLASH_PAGE_SIZE;
    u32 address = nAddr % DEF_FLASH_PAGE_SIZE;
    u8 arr_flash_cmd[9];

#ifdef  __DEBUG__
    rt_kprintf("store_read(nAddr: 0x%08X, nSize: %10d)
", nAddr, nSize);
#endif

if ((page < DEF_FLASH_MAX_PAGE)&&(nSize > 0)&&(pData != NULL))
    {
        store_waitBusy();
        store_selectFlash(FALSE, TRUE);
        store_selectFlash(TRUE, TRUE);

arr_flash_cmd[i++] = DEF_FLASH_OP_CONT_READ;
        arr_flash_cmd[i++] = ADR_P_B_1(page);
        arr_flash_cmd[i++] = ADR_P_B_2(page,address);
        arr_flash_cmd[i++] = ADR_P_B_3(address);
        arr_flash_cmd[i++] = 0x00;
        arr_flash_cmd[i++] = 0x00;
        arr_flash_cmd[i++] = 0x00;
        arr_flash_cmd[i++] = 0x00;

/*发命令字*/
        store_dma_tx_init(arr_flash_cmd, i);
        /*传数据*/
        store_dma_rx_init(pData, nSize);
        store_selectFlash(FALSE, FALSE);

return TRUE;
    }
    else
    {
        return FALSE;
    }

}

/*******************************************************************************
* Function Name : store_write
* Description   : 存储器写
*                  
* Input         : nAddr :Flash地址
*               : nSize :大小
*               : pData :数据指针
* Output        : None
* Return        : true or false
*******************************************************************************/
bool store_write(const u32 nAddr, const u32 nSize, void* pData)
{
    u16 i = 0;
    u32 page = nAddr / DEF_FLASH_PAGE_SIZE;
    u32 address = nAddr % DEF_FLASH_PAGE_SIZE;
    u8 arr_flash_cmd[9];

#ifdef  __DEBUG__
    rt_kprintf("store_write(nAddr: 0x%08X, nSize: %10d)
", nAddr, nSize);
#endif

if ((page < DEF_FLASH_MAX_PAGE)&&(nSize > 0)&&(pData != NULL))
    {
        store_waitBusy();
        store_selectFlash(FALSE, TRUE);
        store_selectFlash(TRUE, TRUE);

arr_flash_cmd[i++] = DEF_FLASH_OP_CONT_WRITE;
        arr_flash_cmd[i++] = ADR_P_B_1(page);
        arr_flash_cmd[i++] = ADR_P_B_2(page,address);
        arr_flash_cmd[i++] = ADR_P_B_3(address);

/*发命令字*/
        store_dma_tx_init(arr_flash_cmd, i);
        /*传数据*/
        store_dma_tx_init(pData, nSize);

store_selectFlash(FALSE, FALSE);

return TRUE;
    }
    else
    {
        return FALSE;
    }
}```