相关文章
《【SDIO】SDIO、SD卡、FatFs文件系统相关文章索引》
1. STM32 的 SDIO 功能框图
STM32 控制器有一个 SDIO，由两部分组成：SDIO 适配器和 APB2 接口，如下图所示。SDIO适配器提供 SDIO 主机功能，可以提供 SD时钟、发送命令和进行数据传输。APB2接口用于控制器访问 SDIO 适配器寄存器并且可以产生中断和 DMA 请求信号。
SDIO使用两个时钟信号，一个是 SDIO 适配器时钟(SDIOCLK=48MHz)，另外一个是APB2总线时钟(PCLK2，一般为 90MHz)。
STM32控制器的 SDIO 是针对 MMC卡和 SD 卡的主设备，所以预留有 8 根数据线，对于 SD卡最多用四根数据线。
SDIO适配器由五个单元组成，分别为：（如下图所示）
- 控制单元
- 命令路径单元
- 数据路径单元
- 寄存器单元
- FIFO
2. STM32 SD卡硬件设计
STM32控制器的 SDIO 引脚是被设计固定不变的，开发板设计采用四根数据线模式。对于命令线和数据线须需要加一个上拉电阻。
3. SD卡读写测试移植
在STM32平台上移植SD卡读写测试相对比较简单，我们可以直接参考标准库里面的SDIO demo进行移植。如：STM32F4xx_DSP_StdPeriph_Lib_V1.8.0\Project\STM32F4xx_StdPeriph_Examples\SDIO\SDIO_uSDCard
- 将
stm324x9i_eval_sdio_sd.c移植到当前工程，它提供了SD_Init()、SD_WriteBlock()和SD_ReadBlock()等SD卡操作函数，我们可以直接拿来使用。
- 编写
sd_test.c文件，实现SD卡的擦除测试、单块写操作测试和多块写操作测试。
/**
* @brief Configures SDIO IRQ channel.
* @param None
* @retval None
*/
static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = SDIO_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = SD_SDIO_DMA_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_Init(&NVIC_InitStructure);
}
/**
* @brief Tests the SD card erase operation.
* @param None
* @retval None
*/
static void SD_EraseTest(void)
{
printf("\r\n---->Erase test is starting...\r\n");
/*------------------- Block Erase ------------------------------------------*/
if (Status == SD_OK)
{
/* Erase NumberOfBlocks Blocks of WRITE_BL_LEN(512 Bytes) */
Status = SD_Erase(0x00, (BLOCK_SIZE * NUMBER_OF_BLOCKS));
}
if (Status == SD_OK)
{
Status = SD_ReadMultiBlocks(aBuffer_MultiBlock_Rx, 0x00, BLOCK_SIZE, NUMBER_OF_BLOCKS);
/* Check if the Transfer is finished */
Status = SD_WaitReadOperation();
/* Wait until end of DMA transfer */
while(SD_GetStatus() != SD_TRANSFER_OK);
}
/* Check the correctness of erased blocks */
if (Status == SD_OK)
{
EraseStatus = eBuffercmp(aBuffer_MultiBlock_Rx, MULTI_BUFFER_SIZE);
}
if(EraseStatus == PASSED)
{
LED1(ON);
printf("\tThe earase is successful.\r\n");
}
else
{
LED1(OFF);
LED3(ON);
printf("\tThe earase is fail!!!\r\n");
}
printf("<----Erase test is end.\r\n");
}
/**
* @brief Tests the SD card Single Blocks operations.
* @param None
* @retval None
*/
static void SD_SingleBlockTest(void)
{
printf("\r\n---->Single block test is starting...\r\n");
/*------------------- Block Read/Write --------------------------*/
/* Fill the buffer to send */
Fill_Buffer(aBuffer_Block_Tx, BLOCK_SIZE, 0x320F);
if (Status == SD_OK)
{
/* Write block of 512 bytes on address 0 */
Status = SD_WriteBlock(aBuffer_Block_Tx, 0x00, BLOCK_SIZE);
/* Check if the Transfer is finished */
Status = SD_WaitWriteOperation();
while(SD_GetStatus() != SD_TRANSFER_OK);
}
if (Status == SD_OK)
{
/* Read block of 512 bytes from address 0 */
Status = SD_ReadBlock(aBuffer_Block_Rx, 0x00, BLOCK_SIZE);
/* Check if the Transfer is finished */
Status = SD_WaitReadOperation();
while(SD_GetStatus() != SD_TRANSFER_OK);
}
/* Check the correctness of written data */
if (Status == SD_OK)
{
TransferStatus1 = Buffercmp(aBuffer_Block_Tx, aBuffer_Block_Rx, BLOCK_SIZE);
}
if(TransferStatus1 == PASSED)
{
LED1(ON);
printf("\tThe test is successful.\r\n");
}
else
{
LED1(OFF);
LED3(ON);
printf("\tThe test is fail!!!\r\n");
}
printf("<----Single block test is end.\r\n");
}
/**
* @brief Tests the SD card Multiple Blocks operations.
* @param None
* @retval None
*/
static void SD_MultiBlockTest(void)
{
printf("\r\n---->Multi block test is starting...\r\n");
/* Fill the buffer to send */
Fill_Buffer(aBuffer_MultiBlock_Tx, MULTI_BUFFER_SIZE, 0x0);
if (Status == SD_OK)
{
/* Write multiple block of many bytes on address 0 */
Status = SD_WriteMultiBlocks(aBuffer_MultiBlock_Tx, 0, BLOCK_SIZE, NUMBER_OF_BLOCKS);
/* Check if the Transfer is finished */
Status = SD_WaitWriteOperation();
while(SD_GetStatus() != SD_TRANSFER_OK);
}
if (Status == SD_OK)
{
/* Read block of many bytes from address 0 */
Status = SD_ReadMultiBlocks(aBuffer_MultiBlock_Rx, 0, BLOCK_SIZE, NUMBER_OF_BLOCKS);
/* Check if the Transfer is finished */
Status = SD_WaitReadOperation();
while(SD_GetStatus() != SD_TRANSFER_OK);
}
/* Check the correctness of written data */
if (Status == SD_OK)
{
TransferStatus2 = Buffercmp(aBuffer_MultiBlock_Tx, aBuffer_MultiBlock_Rx, MULTI_BUFFER_SIZE);
}
if(TransferStatus2 == PASSED)
{
LED1(ON);
printf("\tThe test is successful.\r\n");
}
else
{
LED1(OFF);
LED3(ON);
printf("\tThe test is fail!!!\r\n");
}
printf("<----Multi block test is end.\r\n");
}
void SD_Test_Start(void)
{
if(Status != SD_OK){
return;
}
/*-------------------------- SD Erase Test ---------------------------- */
SD_EraseTest();
/*-------------------------- SD Single Block Test --------------------- */
SD_SingleBlockTest();
/*-------------------------- SD Multi Blocks Test --------------------- */
SD_MultiBlockTest();
}
void SD_Test_Init(void)
{
/* NVIC Configuration */
NVIC_Configuration();
/*------------------------------ SD Init ---------------------------------- */
if((Status = SD_Init()) == SD_OK)
{
printf("The SD Card is successfully initialized!!!\r\n");
}else{
LED3(ON);
printf("The SD Card is fail initialized!!!\r\n");
}
}
- 在
main.c中调用SD卡读写测试。
int main(void)
{
// ...
SD_Test_Init();
SD_Test_Start();
while(1){
// Do nothing!!!
}
//return 0;
}
4. 验证测试
最后验证测试成功，如下：
5. 资料下载地址
移植成功的完整代码下载地址如下：
https://download.csdn.net/download/ZHONGCAI0901/15265756