设计说明

test_mdi 命令的实现代码可以作为 APP 的设计参考，详见 bsp/examples/test-mdi/test_mdi.c：

static const char sopts[] = "c:h";
static const struct option lopts[] = {
    {"count",       required_argument, NULL, 'c'},
    {"help",              no_argument, NULL, 'h'},
    {0, 0, 0, 0}
};

/* Functions */

static void usage(char *program)
{
    printf("Compile time: %s %s\n", __DATE__, __TIME__);
    printf("Usage: %s [options]: \n", program);
    printf("\t -c, --count\t\tthe number of capture frame \n");
    printf("\t -h, --help \n");
    printf("\n");
    printf("Example: %s -c 1\n", program);
}

static long long int str2int(char *_str)
{
    if (_str == NULL) {
        pr_err("The string is empty!\n");
        return -1;
    }

    if (strncmp(_str, "0x", 2))
        return atoi(_str);
    else
        return strtoll(_str, NULL, 16);
}

#define MDI_USE_8080_X16
// #define MDI_USE_8080_X8
// #define MDI_USE_6800_X16
// #define MDI_USE_6800_X8
// #define MDI_USE_SPI

/* TODO: Should parse the input format from three GPIO
 *
 * GPIO1 GPIO2 GPIO3 Bus Mode
 * ----- ----- ----- ---------
 * 0     0     0     8080 X16
 * 0     0     1     8080 X8
 * 0     1     0     6800 X16
 * 0     1     1     6800 X8
 * 1     0     0     SPI 3-Wire
 * 1     0     1     SPI 4-Wire
 * 1     1     0     SPI 2-SDA
 * 1     1     1     SPI 4-SDA
 */
static int aic_mdi_bus_fmt_load(struct aic_mdi_cfg *cfg)
{
    char *bus_mode[] = {"8080", "6800", "SPI"};

#ifdef MDI_USE_SPI
    char *spi_mode[] = {"3-Wire", "4-Wire", "2-SDA", "4-SDA"};

    /* For SPI bus */
    cfg->bus_mode = MDI_BUS_MODE_SPI;
    cfg->big_endian = MDI_DAT_ENDIAN_HIGH_8;
    cfg->bus_spi.mode = MDI_SPI_MODE_4SDA;

    printf("Bus mode: %s %s, Big endian: %d\n", bus_mode[cfg->bus_mode],
           spi_mode[cfg->bus_spi.mode], cfg->big_endian);
    return 0;
#endif

#ifdef MDI_USE_8080_X16
    /* For 8080 bus */
    cfg->bus_mode = MDI_BUS_MODE_8080;
    cfg->bus_8080.pin = MDI_PIN_CTL_X16;
#endif

#ifdef MDI_USE_8080_X8
    cfg->bus_mode = MDI_BUS_MODE_8080;
    cfg->bus_8080.pin = MDI_PIN_CTL_X8;
    cfg->big_endian = MDI_DAT_ENDIAN_HIGH_8;
#endif

    printf("Bus mode: %s, Pin: %s, Big endian: %d\n", bus_mode[cfg->bus_mode],
           cfg->bus_8080.pin ? "X16" : "X8", cfg->big_endian);

    return 0;
}

static void cmd_test_mdi(int argc, char **argv)
{
    int c;
    u32 frame_cnt = 0;
    struct aic_mdi_cfg cfg = {0};

    optind = 0;
    while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
        switch (c) {
        case 'c':
            frame_cnt = str2int(optarg);
            continue;

        case 'h':
            usage(argv[0]);
            return;

        default:
            break;
        }
    }

    if (frame_cnt)
        pr_info("Capture %d frames from DBI\n", frame_cnt);

    if (aic_mdi_bus_fmt_load(&cfg) < 0) {
        pr_err("Failed to get the BUS format of MDI\n");
        return;
    }

    mpp_vin_dev_init(frame_cnt, &cfg);
}
MSH_CMD_EXPORT_ALIAS(cmd_test_mdi, test_mdi, Test MDI module);