【stm32库应用】SD驱动移植（基于SDIO外设）

上星期六刚刚买的新板子，因为之前的板子是蓝桥杯竞赛专用板（STM32F103RB）64PIN的，外设很少，以后比赛结束还要把这个烂板子交个学校创新创业中心！

由于之前答应@蓝桥杯-嵌入式交流群里面的哥们们把SD卡搞下，所以就接着新板子，来处理下SD卡这个东西（后期还将做fatfs文件系统移植）

图1 SD接口图

图1 的接口图不是完全正确的，每个PIN上都必须接一个50K的上拉电阻；

在ST官方提供的库里面有很多意见做好的外设，LCD，EEPROM，等等，当然我们比较幸运，也包括SD卡，这次移植基于3.5的库

我们要移植的文件在这个STM32F10x_StdPeriph_Lib_V3.5.0\Utilities\STM32_EVAL下：

图2 移植需要的文件

因为我的板子是stm32f103vet6跟STM3210E_EVAL比较相近，所以选这个；

图3 common目录

把stm32_eval_spi_sd.c / stm32_eval_spi_sd.h 复制到你的工程里面，并添加；如果就这样编译的话有很多error和warning；

因为他里面确实一些函数，这些函数属于API层、或者说是驱动层的，跟处理器有关，所以我们就要到STM3210E_EVAL目录下看看了。

如果你把上面那个直接拿过去编译的话，会提示少下面一些函数：

void SD_LowLevel_DeInit(void);
void SD_LowLevel_Init(void); 
void SD_LowLevel_DMA_TxConfig(uint32_t *BufferSRC, uint32_t BufferSize);
void SD_LowLevel_DMA_RxConfig(uint32_t *BufferDST, uint32_t BufferSize);
uint32_t SD_DMAEndOfTransferStatus(void);

和一些宏定义：

/**
  * @brief  SD FLASH SDIO Interface
  */ 

#define SD_DETECT_PIN                    GPIO_Pin_11                 /* PF.11 */
#define SD_DETECT_GPIO_PORT              GPIOF                       /* GPIOF */
#define SD_DETECT_GPIO_CLK               RCC_APB2Periph_GPIOF

#define SDIO_FIFO_ADDRESS                ((uint32_t)0x40018080)
/** 
  * @brief  SDIO Intialization Frequency (400KHz max)
  */
#define SDIO_INIT_CLK_DIV                ((uint8_t)0xB2)
/** 
  * @brief  SDIO Data Transfer Frequency (25MHz max) 
  */
#define SDIO_TRANSFER_CLK_DIV            ((uint8_t)0x00) 

这些声明和定义都在STM3210E_EVAL目录下的 "stm3210e_eval.h"里面，找到他们并复制到stm32_eval_spi_sd.h里面，如果你不想找的话，直接把我的这些复制走就好了！

对应的函数也都在"stm3210e_eval.c"里面；

/**
  * @brief  DeInitializes the SDIO interface.
  * @param  None
  * @retval None
  */
void SD_LowLevel_DeInit(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
  
  /*!< Disable SDIO Clock */
  SDIO_ClockCmd(DISABLE);
  
  /*!< Set Power State to OFF */
  SDIO_SetPowerState(SDIO_PowerState_OFF);

  /*!< DeInitializes the SDIO peripheral */
  SDIO_DeInit();
  
  /*!< Disable the SDIO AHB Clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_SDIO, DISABLE);

  /*!< Configure PC.08, PC.09, PC.10, PC.11, PC.12 pin: D0, D1, D2, D3, CLK pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /*!< Configure PD.02 CMD line */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
}

/**
  * @brief  Initializes the SD Card and put it into StandBy State (Ready for 
  *         data transfer).
  * @param  None
  * @retval None
  */
void SD_LowLevel_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

  /*!< GPIOC and GPIOD Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | SD_DETECT_GPIO_CLK, ENABLE);

  /*!< Configure PC.08, PC.09, PC.10, PC.11, PC.12 pin: D0, D1, D2, D3, CLK pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /*!< Configure PD.02 CMD line */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  /*!< Configure SD_SPI_DETECT_PIN pin: SD Card detect pin */
  GPIO_InitStructure.GPIO_Pin = SD_DETECT_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(SD_DETECT_GPIO_PORT, &GPIO_InitStructure);
  
  /*!< Enable the SDIO AHB Clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_SDIO, ENABLE);

  /*!< Enable the DMA2 Clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
}

/**
  * @brief  Configures the DMA2 Channel4 for SDIO Tx request.
  * @param  BufferSRC: pointer to the source buffer
  * @param  BufferSize: buffer size
  * @retval None
  */
void SD_LowLevel_DMA_TxConfig(uint32_t *BufferSRC, uint32_t BufferSize)
{

  DMA_InitTypeDef DMA_InitStructure;

  DMA_ClearFlag(DMA2_FLAG_TC4 | DMA2_FLAG_TE4 | DMA2_FLAG_HT4 | DMA2_FLAG_GL4);

  /*!< DMA2 Channel4 disable */
  DMA_Cmd(DMA2_Channel4, DISABLE);

  /*!< DMA2 Channel4 Config */
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SDIO_FIFO_ADDRESS;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)BufferSRC;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = BufferSize / 4;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA2_Channel4, &DMA_InitStructure);

  /*!< DMA2 Channel4 enable */
  DMA_Cmd(DMA2_Channel4, ENABLE);  
}

/**
  * @brief  Configures the DMA2 Channel4 for SDIO Rx request.
  * @param  BufferDST: pointer to the destination buffer
  * @param  BufferSize: buffer size
  * @retval None
  */
void SD_LowLevel_DMA_RxConfig(uint32_t *BufferDST, uint32_t BufferSize)
{
  DMA_InitTypeDef DMA_InitStructure;

  DMA_ClearFlag(DMA2_FLAG_TC4 | DMA2_FLAG_TE4 | DMA2_FLAG_HT4 | DMA2_FLAG_GL4);

  /*!< DMA2 Channel4 disable */
  DMA_Cmd(DMA2_Channel4, DISABLE);

  /*!< DMA2 Channel4 Config */
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SDIO_FIFO_ADDRESS;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)BufferDST;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = BufferSize / 4;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA2_Channel4, &DMA_InitStructure);

  /*!< DMA2 Channel4 enable */
  DMA_Cmd(DMA2_Channel4, ENABLE); 
}

/**
  * @brief  Returns the DMA End Of Transfer Status.
  * @param  None
  * @retval DMA SDIO Channel Status.
  */
uint32_t SD_DMAEndOfTransferStatus(void)
{
  return (uint32_t)DMA_GetFlagStatus(DMA2_FLAG_TC4);
}

同样，把这些复制到stm32_eval_spi_sd.c里面；你也可以从这里直接复制！

就这么多，如果你不是我这个平台的处理器，那么一定要注意找到适合你自己的再移植！

如何判别是否适合呢？

在STM321xxxE_EVAL目录下的stm32xxxe_eval.c里面看函数void SD_LowLevel_DeInit(void)；看他初始化的管脚是否是你的外设管脚；

  /*!< Configure PC.08, PC.09, PC.10, PC.11, PC.12 pin: D0, D1, D2, D3, CLK pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

OK！这些移植好后，我们可以到STM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\SDIO\uSDCard里面把例程移植一个看看效果怎么样；

我这里用了这个代码，看看他有SD卡有多大：

		Status = SD_Init();
    Status = SD_GetCardInfo(&SDCardInfo);
		printf("%d,%d\n",SDCardInfo.CardBlockSize,SDCardInfo.CardCapacity);
    Status = SD_SelectDeselect((uint32_t) (SDCardInfo.RCA << 16));
    Status = SD_EnableWideBusOperation(SDIO_BusWide_4b); 
    Status = SD_ReadBlock(buff, 0x00,  512); 
		if (Status == SD_OK)
				printf("\nRead%s",buff);
		printf("Test SD OK!");

图4: 效果图

【1：block size   2：memory size   3：read message】

今天就先到这里了！周日之前把fatfs文件系统移植好！

再次感谢 @STM32-粤-十万  的启发！！！

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