Card Detect pin via hardware controller
Posted: Thu May 14, 2020 3:51 am
Dear Espressif,
I am trying to use the full capabilities of the SDMMC driver, but, for some reason I can not make use of the CD pin on the ESP32 driver.
To simplify, I'm putting below a copy of the example, already modified to use the pin 36 as the CD pin, dettached of the rest of my code. Instead of any specific errors, I'm having the pattern output. I even tried to remove it during a operation, but, unffortunetly, I was not able to get any reactions. Also looked to the documentation, but the informations that I found was not compatible with the reality. By the way, the read and write are working fine and the CD pin is in pull up, and becomes GND when the SD is inserted. The problem is just the fact that it does not recognize removal.
I am trying to use the full capabilities of the SDMMC driver, but, for some reason I can not make use of the CD pin on the ESP32 driver.
To simplify, I'm putting below a copy of the example, already modified to use the pin 36 as the CD pin, dettached of the rest of my code. Instead of any specific errors, I'm having the pattern output. I even tried to remove it during a operation, but, unffortunetly, I was not able to get any reactions. Also looked to the documentation, but the informations that I found was not compatible with the reality. By the way, the read and write are working fine and the CD pin is in pull up, and becomes GND when the SD is inserted. The problem is just the fact that it does not recognize removal.
detected chip: generic
I (312) spi_flash: flash io: dio
W (312) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (322) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (333) example: Initializing SD card
I (333) example: Using SDMMC peripheral
I (343) gpio: GPIO[13]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
E (353) example: Failed to initialize the card (ESP_ERR_NOT_FOUND). Make sure SD card lines have pull-up resistors in place.
Code: Select all
#include <stdio.h>
#include <string.h>
#include <sys/unistd.h>
#include <sys/stat.h>
#include "esp_err.h"
#include "esp_log.h"
#include "esp_vfs_fat.h"
#include "driver/sdspi_host.h"
#include "driver/spi_common.h"
#include "sdmmc_cmd.h"
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#ifdef CONFIG_IDF_TARGET_ESP32
#include "driver/sdmmc_host.h"
#endif
static const char *TAG = "example";
#define MOUNT_POINT "/sdcard"
// This example can use SDMMC and SPI peripherals to communicate with SD card.
// By default, SDMMC peripheral is used.
// To enable SPI mode, uncomment the following line:
// #define USE_SPI_MODE
// ESP32-S2 doesn't have an SD Host peripheral, always use SPI:
#ifdef CONFIG_IDF_TARGET_ESP32S2
#ifndef USE_SPI_MODE
#define USE_SPI_MODE
#endif // USE_SPI_MODE
// on ESP32-S2, DMA channel must be the same as host id
#define SPI_DMA_CHAN host.slot
#endif //CONFIG_IDF_TARGET_ESP32S2
// DMA channel to be used by the SPI peripheral
#ifndef SPI_DMA_CHAN
#define SPI_DMA_CHAN 1
#endif //SPI_DMA_CHAN
// When testing SD and SPI modes, keep in mind that once the card has been
// initialized in SPI mode, it can not be reinitialized in SD mode without
// toggling power to the card.
#ifdef USE_SPI_MODE
// Pin mapping when using SPI mode.
// With this mapping, SD card can be used both in SPI and 1-line SD mode.
// Note that a pull-up on CS line is required in SD mode.
#define PIN_NUM_MISO 2
#define PIN_NUM_MOSI 15
#define PIN_NUM_CLK 14
#define PIN_NUM_CS 13
#endif //USE_SPI_MODE
#define SDMMC_CD_PIN 36
void app_main(void)
{
esp_err_t ret;
// Options for mounting the filesystem.
// If format_if_mount_failed is set to true, SD card will be partitioned and
// formatted in case when mounting fails.
esp_vfs_fat_sdmmc_mount_config_t mount_config = {
#ifdef CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED
.format_if_mount_failed = true,
#else
.format_if_mount_failed = false,
#endif // EXAMPLE_FORMAT_IF_MOUNT_FAILED
.max_files = 5,
.allocation_unit_size = 16 * 1024};
sdmmc_card_t *card;
const char mount_point[] = MOUNT_POINT;
ESP_LOGI(TAG, "Initializing SD card");
// Use settings defined above to initialize SD card and mount FAT filesystem.
// Note: esp_vfs_fat_sdmmc/sdspi_mount is all-in-one convenience functions.
// Please check its source code and implement error recovery when developing
// production applications.
#ifndef USE_SPI_MODE
ESP_LOGI(TAG, "Using SDMMC peripheral");
sdmmc_host_t host = SDMMC_HOST_DEFAULT();
// 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.
// sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
sdmmc_slot_config_t slot_config = {
.gpio_cd = SDMMC_CD_PIN,
.gpio_wp = SDMMC_SLOT_NO_WP,
.width = SDMMC_SLOT_WIDTH_DEFAULT,
.flags = 0,
};
// To use 1-line SD mode, uncomment the following line:
// slot_config.width = 1;
// GPIOs 15, 2, 4, 12, 13 should have external 10k pull-ups.
// Internal pull-ups are not sufficient. However, enabling internal pull-ups
// does make a difference some boards, so we do that here.
gpio_set_pull_mode(15, GPIO_PULLUP_ONLY); // CMD, needed in 4- and 1- line modes
gpio_set_pull_mode(2, GPIO_PULLUP_ONLY); // D0, needed in 4- and 1-line modes
gpio_set_pull_mode(4, GPIO_PULLUP_ONLY); // D1, needed in 4-line mode only
gpio_set_pull_mode(12, GPIO_PULLUP_ONLY); // D2, needed in 4-line mode only
gpio_set_pull_mode(13, GPIO_PULLUP_ONLY); // D3, needed in 4- and 1-line modes
ret = esp_vfs_fat_sdmmc_mount(mount_point, &host, &slot_config, &mount_config, &card);
#else
ESP_LOGI(TAG, "Using SPI peripheral");
sdmmc_host_t host = SDSPI_HOST_DEFAULT();
spi_bus_config_t bus_cfg = {
.mosi_io_num = PIN_NUM_MOSI,
.miso_io_num = PIN_NUM_MISO,
.sclk_io_num = PIN_NUM_CLK,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 4000,
};
ret = spi_bus_initialize(host.slot, &bus_cfg, SPI_DMA_CHAN);
if (ret != ESP_OK)
{
ESP_LOGE(TAG, "Failed to initialize bus.");
return;
}
// 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;
ret = esp_vfs_fat_sdspi_mount(mount_point, &host, &slot_config, &mount_config, &card);
#endif //USE_SPI_MODE
if (ret != ESP_OK)
{
if (ret == ESP_FAIL)
{
ESP_LOGE(TAG, "Failed to mount filesystem. "
"If you want the card to be formatted, set the 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(ret));
}
return;
}
// Card has been initialized, print its properties
sdmmc_card_print_info(stdout, card);
// Use POSIX and C standard library functions to work with files.
// First create a file.
ESP_LOGI(TAG, "Opening file");
FILE *f = fopen(MOUNT_POINT "/hello.txt", "w");
if (f == NULL)
{
ESP_LOGE(TAG, "Failed to open file for writing");
return;
}
fprintf(f, "Hello %s!\n", card->cid.name);
fclose(f);
ESP_LOGI(TAG, "File written");
// Check if destination file exists before renaming
struct stat st;
if (stat(MOUNT_POINT "/foo.txt", &st) == 0)
{
// Delete it if it exists
unlink(MOUNT_POINT "/foo.txt");
}
// Rename original file
ESP_LOGI(TAG, "Renaming file");
if (rename(MOUNT_POINT "/hello.txt", MOUNT_POINT "/foo.txt") != 0)
{
ESP_LOGE(TAG, "Rename failed");
return;
}
// Open renamed file for reading
ESP_LOGI(TAG, "Reading file");
f = fopen(MOUNT_POINT "/foo.txt", "r");
if (f == NULL)
{
ESP_LOGE(TAG, "Failed to open file for reading");
return;
}
char line[64];
fgets(line, sizeof(line), f);
fclose(f);
// strip newline
char *pos = strchr(line, '\n');
if (pos)
{
*pos = '\0';
}
ESP_LOGI(TAG, "Read from file: '%s'", line);
// All done, unmount partition and disable SDMMC or SPI peripheral
esp_vfs_fat_sdmmc_unmount(mount_point, card);
ESP_LOGI(TAG, "Card unmounted");
#ifdef USE_SPI_MODE
//deinitialize the bus after all devices are removed
spi_bus_free(host.slot);
#endif
}