Problem with ESP32-S3 and eMMC (IDFGH-6615)

[simeondmr]

Hello,

I'm using esp32-s3 and a MicroSD card adapter, with these connections(SDMMC_HOST_FLAG_1BIT):

• CLK: GPIO_NUM_14
• CMD: GPIO_NUM_15
• D0: GPIO_NUM_2

and this is my code:

sdmmc_card_t *card;
sdmmc_host_t host = SDMMC_HOST_DEFAULT();
    
host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
host.flags = SDMMC_HOST_FLAG_1BIT;

sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
sdmmc_host_init_slot(SDMMC_HOST_SLOT_1, &slot_config);

gpio_pullup_en(GPIO_NUM_14);
gpio_pulldown_dis(GPIO_NUM_14);
gpio_pullup_en(GPIO_NUM_15);
gpio_pulldown_dis(GPIO_NUM_15);
gpio_pullup_en(GPIO_NUM_2);
gpio_pulldown_dis(GPIO_NUM_2);
gpio_pullup_en(GPIO_NUM_4);
gpio_pulldown_dis(GPIO_NUM_4);
gpio_pullup_en(GPIO_NUM_12);
gpio_pulldown_dis(GPIO_NUM_12);
gpio_pullup_en(GPIO_NUM_13);
gpio_pulldown_dis(GPIO_NUM_13);

esp_vfs_fat_sdmmc_mount_config_t mount_config = {
	.format_if_mount_failed = false,
	.max_files = 5,
};

esp_err_t ret = esp_vfs_fat_sdmmc_mount("/root", &host, &slot_config, &mount_config, &card);

The problem is that I have these errors (and the esp_vfs_fat_sdmmc_mount return always error=0x107):

E (3193) sdmmc_common: sdmmc_init_ocr: send_op_cond (1) returned 0x107
E (3193) vfs_fat_sdmmc: sdmmc_card_init failed (0x107).
Failed to initialize the card. Make sure SD card lines have pull-up resistors in place.

I have done also the eFuse, but nothing change...

With esp32-wroom32 and esp32-pico mini I have no problem with the same code and wire.

please could you help me?

Thanks

Simeon

[igrr]

Hi @simeondmr, for ESP32-S3, SD card pins need to be configured explicitly, since SDMMC peripheral now works with arbitrary GPIOs. The docs have just been updated, please see https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/api-reference/peripherals/sdmmc_host.html#configuring-gpios.

You probably need something along these lines:

sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
slot_config.width = 1;
slot_config.clk = GPIO_NUM_14;
slot_config.cmd = GPIO_NUM_15;
slot_config.d0 = GPIO_NUM_2;
sdmmc_host_init_slot(SDMMC_HOST_SLOT_1, &slot_config);

[simeondmr]

Hello @igrr, thanks a lot for your reply!

Sorry I make a mistake...I'm using the eMMC(not SD).
Added your code, using the SD,

esp_vfs_fat_sdmmc_mount("/root", &host, &slot_config, &mount_config, &card);

work correctly, but for example this code fail:

FILE *test = fopen("/root/testfile1bit.raw", "w");

At the moment I must use the eMMC and also with your code, the problem persist as in my first question.

The updated code is:

sdmmc_card_t *card;
sdmmc_host_t host = SDMMC_HOST_DEFAULT();
  
host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
host.flags = SDMMC_HOST_FLAG_1BIT;

sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
slot_config.width = 1;
slot_config.clk = GPIO_NUM_14;
slot_config.cmd = GPIO_NUM_15;
slot_config.d0 = GPIO_NUM_2;

sdmmc_host_init_slot(SDMMC_HOST_SLOT_1, &slot_config);

gpio_pullup_en(GPIO_NUM_14);
gpio_pulldown_dis(GPIO_NUM_14);
gpio_pullup_en(GPIO_NUM_15);
gpio_pulldown_dis(GPIO_NUM_15);
gpio_pullup_en(GPIO_NUM_2);
gpio_pulldown_dis(GPIO_NUM_2);
gpio_pullup_en(GPIO_NUM_4);
gpio_pulldown_dis(GPIO_NUM_4);
gpio_pullup_en(GPIO_NUM_12);
gpio_pulldown_dis(GPIO_NUM_12);
gpio_pullup_en(GPIO_NUM_13);
gpio_pulldown_dis(GPIO_NUM_13);

puts("Initialize HOST and SLOT");

esp_vfs_fat_sdmmc_mount_config_t mount_config = {
    .format_if_mount_failed = false,
    .max_files = 5,
};
  
esp_err_t ret = esp_vfs_fat_sdmmc_mount("/root", &host, &slot_config, &mount_config, &card);

Do you have any idea?

Thanks a lot!

Simeon

[igrr]

If it works with SD but fails with eMMC then it could be a timing issue. Does it work with eMMC at lower frequency? I.e. if you remove host.max_freq_khz = SDMMC_FREQ_HIGHSPEED; line? Do you have a logic analyzer or an oscilloscope to capture the signals between ESP32-S3 and eMMC and verify timing and signal integrity?

[simeondmr]

I removed the host.max_freq_khz = SDMMC_FREQ_HIGHSPEED; but not work.
Also with host.max_freq_khz = SDMMC_FREQ_DEFAULT; I have the same problem.

At the moment I don't have an oscilloscope...but I don't think that could be a timing issue because with host.max_freq_khz = SDMMC_FREQ_HIGHSPEED; on ESP32-WROOM32 and ESP32-PICO MINI, the eMMC work correctly.

[igrr]

ESP32-S3 has different timing of the SDMMC peripheral since the signals now go through GPIO matrix, so the fact that ESP32 works in the same conditions is not really important.

Could you describe the connections between ESP32-S3 and eMMC chip? Are both on a PCB or you are connecting them by some cables?

[simeondmr]

I'm using the Waveshare SD adapter https://www.waveshare.com/micro-sd-storage-board.htm and at the moment the connection between ESP32-S3 and Waveshare SD adapter are made using bredboard jumper cables(it's and experiment), but after this I have to use a PCB.

Tell me if you need other info.

Thanks a lot for your time.

[igrr]

You are using Waveshare SD adapter for the SD card (which works, as I understand), but what about eMMC? Are you using some eMMC-to-SD adapter? (Asking just to understand how to replicate your issue)

[simeondmr]

I'm using the eMMC: BWCTASC11P32G and Waveshare SD adapter also for eMMC, using eMMC to SD adapter.
The adapter is: https://www.audiophonics.fr/en/raspberry-pi-and-other-sbc-accessories/allo-emmc-card-16go-with-micro-sd-adapter-p-12663.html

Thanks

[simeondmr]

Hello, do you have some news about the issue?

[vmastellone]

Hello @igrr,
I'm issuing the same problem using ESP32-S3-DevKitC anda eMMC to microSD adapter.
Is there any new suggestion about this issue?
Many thanks in advance

[igrr]

Hi @simeondmr @vmastellone we're ordering an eMMC-to-SD adapter to reproduce the issue, I'll keep you updated about the progress.

[simeondmr]

Hello, I have an update for @igrr and @vmastellone.
I make a PCB with the same connection, but the problem is still the same.
Thanks!