I'm so flabbergasted by what I'm experiencing with trying to interact with an SD card and in esp32-s3 that I'm not even sure how to fully articulate it. I'm using esp-idf 5.1.2. I'm trying to get the sd_card example running. I have at least a dozen microSD cards I'm trying - Sandisk, MicroCenter, a bunch of others in various sizes. I have 4 different microSD breakout boards. Every permutation of these causes the example code to fail:
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E (30361) vfs_fat_sdmmc: sdmmc_card_init failed (0x107).
E (30361) SB - sd-read-write: Failed to initialize the card (ESP_ERR_TIMEOUT). The thing that flabbergasts me the most, however: I've put log statements every few lines - when I bypass the format step, I see all of the log statements run. BUT, if I include the format line, NONE of the log statements print anything! The code almost immediately seems to jump over itself straight to this error. The only way I can get the thing to run how I might expect is by periodically inserting large delays in the code (even then, the format causes corruption, but I can at least see it making its way through the code as I expect).
I just can't imagine why this might be happening - is there something in the ESP that can cause code to run non-linearly?
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void app_main(void)
{
esp_err_t error_status;
sdmmc_card_t *card;
const char mount_point[] = MOUNT_POINT;
// Options for mounting the filesystem.
esp_vfs_fat_sdmmc_mount_config_t mount_config = {
.format_if_mount_failed = true, // format SD card if it fails to mount
.max_files = 5, // max number of concurrent open files
.allocation_unit_size = 16*1024 // not sure I all the way understand this, but
// it has to do with the case when mounting
// fails and formatting is done. TO DO:
// learn about allocation unit size?
};
ESP_LOGI(TAG, "Initializing SD card");
ESP_LOGI(TAG, "Using SPI peripheral");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
// It appears that here we configure the "host", which is the microcontroller itself.
// Among the things we want to configure is the frequency at which the host
// communicates with the SD card (the 'peripheral).
//
// From Espressif:
// By default, SD card frequency is initialized to SDMMC_FREQ_DEFAULT (20MHz)
// For setting a specific frequency, use host.max_freq_khz (range 400kHz - 20MHz for SDSPI)
// Example: for fixed frequency of 10MHz, use host.max_freq_khz = 10000;
sdmmc_host_t host = SDSPI_HOST_DEFAULT();
host.max_freq_khz = SDMMC_FREQ_DEFAULT;
//host.max_freq_khz = SDMMC_FREQ_PROBING;
spi_bus_config_t bus_cfg = {
.mosi_io_num = PIN_NUM_DI,
.miso_io_num = PIN_NUM_DO,
.sclk_io_num = PIN_NUM_CLK,
// .max_transfer_sz = 4000,// Maximum transfer size.
// .quadwp_io_num = -1, // This is for Write Protect, which we apparently aren't reading/using
// .quadhd_io_num = -1, // This is for a Hold signal. Apparently when communicating with an
// // SD card over SPI, we may want to interrupt a given transaction with
// // the card without necessarily aborting communication with it
// // entirely. In such a case, we can issue a Hold signal, which allows
// // us to "unplug" other lines to then handle other tasks, then re-plug
// // them back into the SD card and resume communication. Interesting.
};
// Try to initialize the bus (communication path) to the SD card.
error_status = spi_bus_initialize( host.slot,
&bus_cfg,
SDSPI_DEFAULT_DMA);
if (error_status != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize bus.");
return;
}
ESP_LOGI(TAG, "Bus initialized. Pausing....");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
// This initializes the slot without card detect (CD) and write protect (WP) signals.
// Modify slot_config.gpio_cd and slot_config.gpio_wp if your board has these signals.
sdspi_device_config_t slot_config = SDSPI_DEVICE_CONFIG_DEFAULT();
slot_config.gpio_cs = PIN_NUM_CS;
slot_config.host_id = host.slot;
// ---------------------------------
// Attempt to mount the filesystem.
// Something to note here is the bit about needing pullup resistors on all the
// SD card pins. For my test, I used 10k pullup resistors (a resistor connecting the
// pin to power) for all of the data pins, and this seems to make things work. Without
// those, I got the error message about needing to use pullup resistors below.
ESP_LOGI(TAG, "Mounting filesystem (pausing...)");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
error_status = esp_vfs_fat_sdspi_mount( mount_point,
&host,
&slot_config,
&mount_config,
&card);
if (error_status != ESP_OK) {
if (error_status == ESP_FAIL) {
ESP_LOGE(TAG, "Failed to mount filesystem. "
"If you want the card to be formatted, set the CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
} else {
// ESP_LOGE(TAG, "Failed to initialize the card (%s). "
// "Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(error_status));
ESP_LOGE(TAG, "Failed to initialize the card (%s). ", esp_err_to_name(error_status));
}
return;
}
ESP_LOGI(TAG, "Filesystem mounted. Pausing...");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
// Card has been initialized, print its properties
sdmmc_card_print_info(stdout, card);
// ---------------------------------
// Write a file to the card.
//
// From ESP-IDF docs: Use POSIX and C standard library functions to work with files.
//
// POSIX seems sort of like Java for Linux in a way; it's a collection of standards
// for linux-like machines for things like file IO and other operations, to allow us
// to generally maintain cross-compatibility among different OSes.
ESP_LOGI(TAG, "Writing file. Pausing...");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
// First, we will create a file name
const char *file_hello = MOUNT_POINT"/hello.txt";
// This array will hole a string (line) of text we'll write to the file
char data[EXAMPLE_MAX_CHAR_SIZE];
// This is apparently how we do the python equvalent of "string1 + string2"
// in C; snprintf is a printf but instead of printing to a terminal
// it prints to the given character array (string).
snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Hello ", card->cid.name);
// Note that at the time I made this, cid.name was returning an empty string.
// Not sure why this might be, possibly a shortcoming of my SD card? It behaves
// fine otherwise though.
// Try to actually write the file.
error_status = s_example_write_file(file_hello, data);
if (error_status != ESP_OK) {
return;
}
ESP_LOGI(TAG, "File written. Pausing...");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
// ---------------------------------
// Rename the file we just created.
const char *file_foo = MOUNT_POINT"/foo.txt";
// Check if this file file exists before renaming
struct stat st;
if (stat(file_foo, &st) == 0) {
// Delete it if it exists
unlink(file_foo);
}
// Rename original file
ESP_LOGI(TAG, "Renaming file %s to %s (pausing...)", file_hello, file_foo);
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
if (rename(file_hello, file_foo) != 0) {
ESP_LOGE(TAG, "Rename failed");
return;
}
// ---------------------------------
// Try to read the renamed file.
ESP_LOGI(TAG, "Reading file. Pausing...");
vTaskDelay(pdMS_TO_TICKS(10000)); // This is a macro.
error_status = s_example_read_file(file_foo);
if (error_status != ESP_OK) {
return;
}
// ---------------------------------
// Now we're going to format the disk, erasing
// our test file in the process.
ESP_LOGI(TAG, "Trying to format card...(pausing)");
// feed the watchdog
vTaskDelay(pdMS_TO_TICKS(1000)); // This is a macro.
//////////////////////////////////////////////////////
// DISASTER STRIKES!!!!!!!!!!!
error_status = esp_vfs_fat_sdcard_format(mount_point, card);
///////////////////////////////////////////////////////
ESP_LOGI(TAG, "Format Done. (pausing)");
// feed the watchdog
vTaskDelay(pdMS_TO_TICKS(1000)); // This is a macro.
...// the rest of the example continues
}
- help me obi wan
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