STM32F4 + eMMC 之 EXT_CSD寄存器读取和写入（修正）

最新推荐文章于 2025-03-03 21:56:54 发布

at91rm9200

最新推荐文章于 2025-03-03 21:56:54 发布

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分类专栏：嵌入式系统

本文链接：https://blog.youkuaiyun.com/at91rm9200/article/details/86688590

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参照 JEDEC eMMC标准：JESD84-B51 (Revision of JESD84-B50.1, July 2014)

基于STM32Cube_FW_F4_V1.21.0库修改（stm32f4xx_hal_mmc.h），4bit模式，其他与SD卡驱动类似。实测写入速度

1MB/s左右。

容量计算：

Capacity = (hmmc->MmcCard.EmmcExtCsd.EXT_CSD.SEC_COUNT[3] << 24 |

hmmc->MmcCard.EmmcExtCsd.EXT_CSD.SEC_COUNT[2] << 16 |
hmmc->MmcCard.EmmcExtCsd.EXT_CSD.SEC_COUNT[1] << 8 |

hmmc->MmcCard.EmmcExtCsd.EXT_CSD.SEC_COUNT[0]) × BlockSize(512)

typedef union
{
       struct _EXT_CSD
       {
           __IO uint8_t Reserved19[15];
           __IO uint8_t CMDQ_MODE_EN;
           __IO uint8_t SECURE_REMOVAL_TYPE;
           __IO uint8_t PRODUCT_STATE_AWARENESS_ENABLEMENT;
           __IO uint8_t MAX_PRE_LOADING_DATA_SIZE[4];
           __IO uint8_t PRE_LOADING_DATA_SIZE[4];
           __IO uint8_t FFU_STATUS;
           __IO uint8_t Reserved18[2];
           __IO uint8_t MODE_OPERATION_CODES;
           __IO uint8_t MODE_CONFIG;
           __IO uint8_t BARRIER_CTRL;
           __IO uint8_t    FLUSH_CACHE;
           __IO uint8_t    CACHE_CTRL;
           __IO uint8_t    POWER_OFF_NOTIFICATION;
           __IO uint8_t    PACKED_FAILURE_INDEX;
           __IO uint8_t    PACKED_COMMAND_STATUS;
           __IO uint8_t    CONTEXT_CONF[15];
           __IO uint8_t    EXT_PARTITIONS_ATTRIBUTE[2];
           __IO uint8_t    EXCEPTION_EVENTS_STATUS[2];
           __IO uint8_t    EXCEPTION_EVENTS_CTRL[2];
           __IO uint8_t    DYNCAP_NEEDED;
           __IO uint8_t    CLASS_6_CTRL;
           __IO uint8_t    INI_TIMEOUT_EMU;
           __IO uint8_t    DATA_SECTOR_SIZE;
           __IO uint8_t    USE_NATIVE_SECTOR;
           __IO uint8_t    NATIVE_SECTOR_SIZE;
           __IO uint8_t    VENDOR_SPECIFIC_FIELD[64];
           __IO uint8_t Reserved17[2];
           __IO uint8_t    PROGRAM_CID_CSD_DDR_SUPPORT;
           __IO uint8_t    PERIODIC_WAKEUP;
           __IO uint8_t    TCASE_SUPPORT;
           __IO uint8_t PRODUCTION_STATE_AWARENESS;
           __IO uint8_t    SEC_BAD_BLK_MGMNT;
           __IO uint8_t Reserved16;
           __IO uint8_t    ENH_START_ADDR[4];
           __IO uint8_t    ENH_SIZE_MULT[3];
           __IO uint8_t    GP_SIZE_MULT[12];
           __IO uint8_t    PARTITION_SETTING_COMPLET

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