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！！！ 蓝桥杯-嵌入式交流群 147520657