emmc读写寄存器的存储代码

以下是使用 C 语言读取和写入 eMMC 寄存器的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>

#define DEVICE "/dev/mem"
#define BLOCK_SIZE (4*1024)

#define EMMC_BASE 0x3f300000
#define EMMC_ARG2 0x00
#define EMMC_BLKSIZECNT 0x04
#define EMMC_ARG1 0x08
#define EMMC_CMDTM 0x0c
#define EMMC_RESP0 0x10
#define EMMC_RESP1 0x14
#define EMMC_RESP2 0x18
#define EMMC_RESP3 0x1c
#define EMMC_DATA 0x20
#define EMMC_STATUS 0x24
#define EMMC_CONTROL0 0x28
#define EMMC_CONTROL1 0x2c
#define EMMC_INTERRUPT 0x30
#define EMMC_INT_MASK 0x34
#define EMMC_INT_EN 0x38
#define EMMC_CONTROL2 0x3c
#define EMMC_CAPABILITIES0 0x40
#define EMMC_CAPABILITIES1 0x44
#define EMMC_FORCE_INTERRUPT 0x50
#define EMMC_ADMA_ERROR_STATUS 0x54
#define EMMC_ADMA_SYS_ADDRESS 0x58
#define EMMC_DLL_CONFIG 0x60
#define EMMC_DLL_STATUS 0x64
#define EMMC_VERSION 0xfc

volatile void *map;

int emmc_init() 
{
    int fd = open(DEVICE, O_RDWR|O_SYNC);
    if(fd < 0) {
        perror("open");
        return -1;
    }
    map = mmap(NULL, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, EMMC_BASE);
    if(map == MAP_FAILED) {
        perror("mmap");
        return -1;
    }
    return 0;
}

void emmc_write_reg(int reg, int value)
{
    volatile int *addr = (volatile int *)((char *)map + reg);
    *addr = value;
}

int emmc_read_reg(int reg)
{
    volatile int *addr = (volatile int *)((char *)map + reg);
    return *addr;
}

int main()
{
    if(emmc_init() < 0) {
        return -1;
    }

    // 读取 eMMC 版本信息
    int version = emmc_read_reg(EMMC_VERSION);
    printf("eMMC Version: 0x%x\n", version);

    // 设置数据块大小和块计数
    int block_size_cnt = 0x200 | (0x1 << 16);
    emmc_write_reg(EMMC_BLKSIZECNT, block_size_cnt);

    // 设置命令和参数
    int cmd = 0x37; // CMD6
    int arg = 0x00fffff1; // 能力寄存器
    emmc_write_reg(EMMC_CMDTM, (arg << 8) | cmd);

    // 等待命令完成
    while(!(emmc_read_reg(EMMC_INTERRUPT) & 0x200));

    // 读取响应
    int resp0 = emmc_read_reg(EMMC_RESP0);
    int resp1 = emmc_read_reg(EMMC_RESP1);
    int resp2 = emmc_read_reg(EMMC_RESP2);
    int resp3 = emmc_read_reg(EMMC_RESP3);
    printf("CMD6 response: 0x%x 0x%x 0x%x 0x%x\n", resp0, resp1, resp2, resp3);

    return 0;
}

该示例代码中使用了 `mmap` 函数将 eMMC 寄存器映射到用户空间，然后可以通过读取和写入这些寄存器来实现对 eMMC 的控制和操作。具体的读写操作可以通过读取 eMMC 的数据手册获得。