Multiple partitions SDK 3.2.0 and toolchain 3.2.1

[jade08]

Hello,

I am trying to access to two partitions of 2gb each on a micro SD card of 32gb.

I can access to one partition of 32gb in my micro sd card but as it is formatted in FAT32, if I have only one partition, I will not access to the entirety of the micro SD card.

Do you know which parameter I have to change to access to two partitions on the same micro SD card, please ?

Below there are the different files of code I use.

Thank you !

Best regards,

Jade

main.c

/*
 * Copyright (c) 2019 Tavish Naruka <[email protected]>
 * Copyright (c) 2023 Nordic Semiconductor ASA
 * Copyright (c) 2023 Antmicro <www.antmicro.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/* Sample which uses the filesystem API and SDHC driver */

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/storage/disk_access.h>
#include <zephyr/logging/log.h>
#include <zephyr/fs/fs.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>

/* Définition des pins SPI basées sur votre pinctrl */
#define SPI_SCK_PIN  13 // P1.13
#define SPI_MOSI_PIN 12 // P1.12
#define SPI_MISO_PIN 14 // P1.14
#define SPI_CS_PIN   15 // P1.15 (Celui que vous soupçonnez)
#define SPI_PORT     DEVICE_DT_GET(DT_NODELABEL(gpio1))

#if defined(CONFIG_FAT_FILESYSTEM_ELM)

#include <ff.h>
PARTITION VolToPart[] = {
    {0, 1},  /* SD1 -> partition 1 */
    {0, 2},  /* SD2 -> partition 2 */
};
/*
 *  Note the fatfs library is able to mount only strings inside _VOLUME_STRS
 *  in ffconf.h
 */
#if defined(CONFIG_DISK_DRIVER_MMC)
#define DISK_DRIVE_NAME "SDHC0"
#else
#define DISK_DRIVE_NAME "SDHC0"
#endif

#define DISK_MOUNT_PT "/"DISK_DRIVE_NAME":"
#define DISK_MOUNT_PTSD1 "/SD1:"
#define DISK_MOUNT_PTSD2 "/SD2:"

#define MAX_PARTS  2  /* jusqu’à 4 partitions possibles */

#define CD_NODE DT_NODELABEL(sd_cd0)
/* Un FATFS par partition */
//static FATFS fat_fs[MAX_PARTS];
//static struct fs_mount_t mp[MAX_PARTS];

static const char *disk_names[MAX_PARTS] = {
    "SD1", "SD2"
};

static const char *mount_points[MAX_PARTS] = {
    "/SD1:", "/SD2:"
};

// static FATFS fat_fs;
// /* mounting info */
// static struct fs_mount_t mp = {
// 	.type = FS_FATFS,
// 	.fs_data = &fat_fs,
// };

#elif defined(CONFIG_FILE_SYSTEM_EXT2)

#include <zephyr/fs/ext2.h>

#define DISK_DRIVE_NAME "SDHC0"
#define DISK_MOUNT_PT "/ext"

// static struct fs_mount_t mp = {
// 	.type = FS_EXT2,
// 	.flags = FS_MOUNT_FLAG_NO_FORMAT,
// 	.storage_dev = (void *)DISK_DRIVE_NAME,
// 	.mnt_point = "/ext",
// };

#endif

#if defined(CONFIG_FAT_FILESYSTEM_ELM)
#define FS_RET_OK FR_OK
#else
#define FS_RET_OK 0
#endif

LOG_MODULE_REGISTER(main);

// #define MAX_PATH 128
// #define SOME_FILE_NAME "some.dat"
// #define SOME_DIR_NAME "some"
// #define SOME_REQUIRED_LEN MAX(sizeof(SOME_FILE_NAME), sizeof(SOME_DIR_NAME))

static int lsdir(const char *path);
// #ifdef CONFIG_FS_SAMPLE_CREATE_SOME_ENTRIES
// static bool create_some_entries(const char *base_path)
// {
// 	char path[MAX_PATH];
// 	struct fs_file_t file;
// 	int base = strlen(base_path);

// 	fs_file_t_init(&file);

// 	if (base >= (sizeof(path) - SOME_REQUIRED_LEN)) {
// 		LOG_ERR("Not enough concatenation buffer to create file paths");
// 		return false;
// 	}

// 	LOG_INF("Creating some dir entries in %s", base_path);
// 	strncpy(path, base_path, sizeof(path));

// 	path[base++] = '/';
// 	path[base] = 0;
// 	strcat(&path[base], SOME_FILE_NAME);

// 	if (fs_open(&file, path, FS_O_CREATE) != 0) {
// 		LOG_ERR("Failed to create file %s", path);
// 		return false;
// 	}
// 	fs_close(&file);

// 	path[base] = 0;
// 	strcat(&path[base], SOME_DIR_NAME);

// 	if (fs_mkdir(path) != 0) {
// 		LOG_ERR("Failed to create dir %s", path);
// 		/* If code gets here, it has at least successes to create the
// 		 * file so allow function to return true.
// 		 */
// 	}
// 	return true;
// }
// #endif

static const char *disk_mount_pt = DISK_MOUNT_PT;

static const char *disk_mount_ptSD1 = DISK_MOUNT_PTSD1;

static const char *disk_mount_ptSD2 = DISK_MOUNT_PTSD2;

static FATFS fat_fs; // Instance de l'objet FatFs

static struct fs_mount_t mp = {
    .type = FS_FATFS,           // Le type de FS
    .mnt_point = "/SD:",        // Le point de montage (doit commencer par / et finir par :)
    .fs_data = &fat_fs,         // Pointeur vers l'objet fat_fs
    .storage_dev = "1:",        // DOIT correspondre au disk-name de l'overlay
    .flags = FS_MOUNT_FLAG_AUTOMOUNT, // Optionnel : aide à l'initialisation
};

static FATFS fat_fs_p1;
static FATFS fat_fs_p2;

// /* Partition 1 */
// static struct fs_mount_t mp_p1 = {
//     .type = FS_FATFS,
//     .mnt_point = "/SD0:",
//     .fs_data = &fat_fs_p1,
//     .storage_dev = "0:", // Le nom du disque dans l'overlay
// };

// /* Partition 2 */
// static struct fs_mount_t mp_p2 = {
//     .type = FS_FATFS,
//     .mnt_point = "/SD1:",
//     .fs_data = &fat_fs_p2,
//     .storage_dev = "1:",
// };

static struct fs_mount_t mp_p1 = {
    .type = FS_FATFS,
    .mnt_point = "/P1:",
    .fs_data = &fat_fs_p1,
    .storage_dev = "0:", // On utilise le LABEL de l'overlay
};

static struct fs_mount_t mp_p2 = {
    .type = FS_FATFS,
    .mnt_point = "/P2:",
    .fs_data = &fat_fs_p2,
    .storage_dev = "1:", // On utilise le LABEL de l'overlay
};

void mount_simple(void) {
    int res = fs_mount(&mp);
    if (res == 0) {
        printk("Succès ! Carte SD montée sur /SD:\n");
    } else {
        printk("Erreur de montage : %d (Vérifie le format FAT32)\n", res);
    }
}

void mount_dual_partitions(void) {
    int res;

    // Initialiser le disque physique une seule fois
    disk_access_init("SD");

    // Monter Partition 1
    res = fs_mount(&mp_p1);
    if (res == 0) printk("Partition 1 montee sur /SD1:\n");

    // Monter Partition 2
    res = fs_mount(&mp_p2);
    if (res == 0) printk("Partition 2 montee sur /SD2:\n");
}

static FATFS fat_fs_d;
static FATFS fat_fs_e;

static struct fs_mount_t mp_d = {
    .type = FS_FATFS,
    .mnt_point = "/D:",
    .fs_data = &fat_fs_d,
    .storage_dev = "SD:0", // ":0" force la 1ère partition de la table MBR
};

static struct fs_mount_t mp_e = {
    .type = FS_FATFS,
    .mnt_point = "/E:",
    .fs_data = &fat_fs_e,
    .storage_dev = "SD:1", // ":1" force la 2ème partition de la table MBR
};

void mount_all(void) {
    // Initialise le hardware une seule fois
    disk_access_init("SD"); 

    // Monte les deux volumes
    if (fs_mount(&mp_d) == 0) printk("Partition D montee !\n");
    if (fs_mount(&mp_e) == 0) printk("Partition E montee !\n");
}

void test_write_file(void)
{
    struct fs_file_t file;
    int ret;
    const char *path = "/SD:/hello.txt";
    const char *data = "Test reussi sur nRF54L15 !\n";

    fs_file_t_init(&file);

    /* 1. Ouvrir le fichier (le creer s'il n'existe pas) */
    ret = fs_open(&file, path, FS_O_CREATE | FS_O_WRITE);
    if (ret < 0) {
        printk("Erreur ouverture fichier : %d\n", ret);
        return;
    }

    /* 2. Ecrire les donnees */
    ret = fs_write(&file, data, strlen(data));
    if (ret < 0) {
        printk("Erreur ecriture : %d\n", ret);
    } else {
        printk("Ecrit %d octets dans %s\n", ret, path);
    }

    /* 3. Fermer le fichier (Tres important pour vider le cache !) */
    fs_close(&file);
}

void safely_unmount(void)
{
    int res;

    res = fs_unmount(&mp); // On utilise la structure static mp

    if (res == 0) {
        printk("Carte SD demontee avec succes. Vous pouvez la retirer.\n");
    } else {
        printk("Erreur lors du demontage : %d\n", res);
    }
}

// void mount_all_partitions(void)
// {
//     for (int i = 0; i < MAX_PARTS; i++) {
// 		mp[i].type = FS_FATFS;
// 		mp[i].fs_data = &fat_fs[i];
// // 	.fs_data = &fat_fs
// 		if (i == 0) {
// 			mp[i].mnt_point = disk_mount_ptSD1;
// 		}
// 		if (i == 1) {
// 			mp[i].mnt_point = disk_mount_ptSD2;
// 		}
//         if (i == 0) {
// 			mp[i].storage_dev = (void *)"SD1";
// 		}
// 		if (i == 1) {
// 			mp[i].storage_dev = (void *)"SD2";
// 		}
//         int res = fs_mount(&mp[i]);
//         if (res == FR_OK) {
//             printk("Partition %s montée sur %s\n", disk_names[i], mount_points[i]);
//         } else {
//             printk("Partition %s non montée (code %d)\n", disk_names[i], res);
//         }
//     }
// }

// void UNmount_all_partitions(void)
// {
//     for (int i = 0; i < MAX_PARTS; i++) {
//         mp[i].type = FS_FATFS;
//         mp[i].mnt_point = mount_points[i];
//         mp[i].fs_data = &fat_fs[i];
//         mp[i].storage_dev = (void *)disk_names[i];

//         int res = fs_unmount(&mp[i]);
//         if (res == FR_OK) {
//             printk("Partition %s demontée sur %s\n", disk_names[i], mount_points[i]);
//         } else {
//             printk("Partition %s non demontée (code %d)\n", disk_names[i], res);
//         }
//     }
// }


// static void write_to_sd(const char *mount_point)
// {
//     char file_path[64];
//     struct fs_file_t file;
//     int ret;

//     /* Construire le chemin du fichier */
//     printk("OK");
//     snprintf(file_path, sizeof(file_path), "/SD1:/test.txt", mount_point);
// printk("OK");
//     fs_file_t_init(&file);
//     printk("OK");

//     /* Ouvrir (ou créer) le fichier en écriture */
//     ret = fs_open(&file, file_path, FS_O_CREATE | FS_O_RDWR);
//     printk("OK");
//     if (ret) {
//         LOG_ERR("Erreur d'ouverture du fichier (%d)", ret);
//         return;
//     }

//     /* Données à écrire */
//     const char msg[] = "Hello SD card from nRF54L15!\n";

//     /* Écriture */
//     ret = fs_write(&file, msg, sizeof(msg) - 1);
//     if (ret < 0) {
//         LOG_ERR("Erreur d'écriture (%d)", ret);
//         fs_close(&file);
//         return;
//     }

//     LOG_INF("Écrit %d octets dans %s", ret, file_path);

//     /* Fermer le fichier */
//     fs_close(&file);

//     /* Lire pour vérifier */
//     ret = fs_open(&file, file_path, FS_O_READ);
//     if (ret) {
//         LOG_ERR("Erreur de réouverture du fichier (%d)", ret);
//         return;
//     }

//     char buf[64];
//     int n = fs_read(&file, buf, sizeof(buf) - 1);
//     if (n >= 0) {
//         buf[n] = '\0';
//         LOG_INF("Contenu lu : %s", buf);
//     } else {
//         LOG_ERR("Erreur de lecture (%d)", n);
//     }

//     fs_close(&file);

// 	    /* Construire le chemin du fichier */
// strcpy(file_path, "SD2:/test.txt");
//     fs_file_t_init(&file);

//     /* Ouvrir (ou créer) le fichier en écriture */
//     ret = fs_open(&file, file_path, FS_O_CREATE | FS_O_RDWR);
//     if (ret) {
//         LOG_ERR("Erreur d'ouverture du fichier (%d)", ret);
//         return;
//     }

//     /* Données à écrire */
//     const char msg2[] = "Hello SD card from nRF54L15!\n";

//     /* Écriture */
//     ret = fs_write(&file, msg2, sizeof(msg2) - 1);
//     if (ret < 0) {
//         LOG_ERR("Erreur d'écriture (%d)", ret);
//         fs_close(&file);
//         return;
//     }

//     LOG_INF("Écrit %d octets dans %s", ret, file_path);

//     /* Fermer le fichier */
//     fs_close(&file);

//     /* Lire pour vérifier */
//     ret = fs_open(&file, file_path, FS_O_READ);
//     if (ret) {
//         LOG_ERR("Erreur de réouverture du fichier (%d)", ret);
//         return;
//     }

//     n = fs_read(&file, buf, sizeof(buf) - 1);
//     if (n >= 0) {
//         buf[n] = '\0';
//         LOG_INF("Contenu lu : %s", buf);
//     } else {
//         LOG_ERR("Erreur de lecture (%d)", n);
//     }

//     fs_close(&file);
// }

// /* Petit utilitaire pour inspecter le MBR et afficher les partitions trouvées */
// static void print_mbr_info(void)
// {
//     uint8_t mbr[512];
//     if (disk_access_read("SD", mbr, 0, 1) != 0) {
//         printk("Impossible de lire le MBR (disk_access_read)\n");
//         return;
//     }
//     printk("MBR signature: 0x%02x%02x\n", mbr[510], mbr[511]);
//     for (int i = 0; i < 4; i++) {
//         uint8_t part_type = mbr[446 + i*16 + 4];
//         uint32_t start_lba = mbr[446 + i*16 + 8] |
//                              (mbr[446 + i*16 + 9] << 8) |
//                              (mbr[446 + i*16 + 10] << 16) |
//                              (mbr[446 + i*16 + 11] << 24);
//         uint32_t num_sectors = mbr[446 + i*16 + 12] |
//                                (mbr[446 + i*16 + 13] << 8) |
//                                (mbr[446 + i*16 + 14] << 16) |
//                                (mbr[446 + i*16 + 15] << 24);
//         if (part_type != 0) {
//             printk("Partition %d: type=0x%02x start=%u sectors=%u\n",
//                    i+1, part_type, start_lba, num_sectors);
//         }
//     }
// }

// void init_sd_card(void)
// {
//     const char *disk_pdrv = "SD";
//     int ret;

//     ret = disk_access_init(disk_pdrv);
//     if (ret != 0) {
//         printk("Erreur init SD card (%d)\n", ret);
//     } else {
//         printk("SD card initialisée\n");
//     }
// }

void main(void) {
    const char *disk_pdrv = "SD";
    
    // 1. INITIALISATION PHYSIQUE (Une seule fois)
    if (disk_access_init(disk_pdrv) != 0) {
        LOG_ERR("Erreur d'initialisation physique !");
        return;
    }

    uint64_t sector_count;
if (disk_access_ioctl("SD", DISK_IOCTL_GET_SECTOR_COUNT, &sector_count) != 0) {
    printk("Erreur : Le driver 'SD' n'est pas reconnu par disk_access\n");
}
    
    // NE PAS FAIRE DE DEINIT ICI !
    
    // 2. MONTAGE DU SYSTÈME DE FICHIERS
    // Assure-toi que mp.storage_dev = "SD"
    mount_dual_partitions(); 
    // if (res == 0) {
    //     printk("Succès : Carte montée !\n");
    // } else {
    //     printk("Erreur montage : %d\n", res);
    // }

    //test_write_file();

    //safely_unmount();
}

/* List dir entry by path
 *
 * @param path Absolute path to list
 *
 * @return Negative errno code on error, number of listed entries on
 *         success.
 */
static int lsdir(const char *path)
{
	int res;
	struct fs_dir_t dirp;
	static struct fs_dirent entry;
	int count = 0;

	fs_dir_t_init(&dirp);

	/* Verify fs_opendir() */
	res = fs_opendir(&dirp, path);
	if (res) {
		printk("Error opening dir %s [%d]\n", path, res);
		return res;
	}

	printk("\nListing dir %s ...\n", path);
	for (;;) {
		/* Verify fs_readdir() */
		res = fs_readdir(&dirp, &entry);

		/* entry.name[0] == 0 means end-of-dir */
		if (res || entry.name[0] == 0) {
			break;
		}

		if (entry.type == FS_DIR_ENTRY_DIR) {
			printk("[DIR ] %s\n", entry.name);
		} else {
			printk("[FILE] %s (size = %zu)\n",
				entry.name, entry.size);
		}
		count++;
	}

	/* Verify fs_closedir() */
	fs_closedir(&dirp);
	if (res == 0) {
		res = count;
	}

	return res;
}

prf.conf

CONFIG_DISK_ACCESS=y
CONFIG_LOG=y
CONFIG_FILE_SYSTEM=y
CONFIG_FAT_FILESYSTEM_ELM=y
CONFIG_PRINTK=y
CONFIG_MAIN_STACK_SIZE=2048
CONFIG_GPIO=y
CONFIG_SPI=y
CONFIG_NRFX_POWER=y
CONFIG_CBPRINTF_FP_SUPPORT=y

nrf54l15dk_nrf54l15_cpuapp.overlay

&spi21 {
    status = "okay";
    compatible = "nordic,nrf-spim";
    pinctrl-0 = <&spi21_default>;
    pinctrl-1 = <&spi21_sleep>;
    pinctrl-names = "default", "sleep";
    cs-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>; // P1.06 - SD_nCS
	sdhc0: sdhc@0 {
		compatible = "zephyr,sdhc-spi-slot";
		reg = <0>;
		status = "okay";
		mmc {
			compatible = "zephyr,sdmmc-disk";
			disk-name = "SD";
			status = "okay";            

		};
		spi-max-frequency = <4000000>; //8000000 max
	};
};

// / {
//     sd_cd: sd_card_detect {
//         compatible = "gpio-keys";
//         sd_cd0: sd_cd0 {
//             gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
//             label = "SD_CARD_DETECT";
//         };
//     };
// };


&uart20 {
	status = "disabled";
};

&pinctrl {
    spi21_default: spi21_default { 
        group1 { 
            psels = <NRF_PSEL(SPIM_SCK, 1, 13)>, 
                    <NRF_PSEL(SPIM_MOSI, 1, 12)>,
                    <NRF_PSEL(SPIM_MISO, 1, 14)>; 
            }; 
        };

    spi21_sleep: spi21_sleep {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK,  1, 13)>,
                    <NRF_PSEL(SPIM_MOSI, 1, 12)>,
                    <NRF_PSEL(SPIM_MISO, 1, 14)>;
            low-power-enable;
        };
    };
};

ffconf.h

/*---------------------------------------------------------------------------/
/  Configurations of FatFs Module
/---------------------------------------------------------------------------*/

#define FFCONF_DEF	80386	/* Revision ID */

/*---------------------------------------------------------------------------/
/ Function Configurations
/---------------------------------------------------------------------------*/

#define FF_FS_READONLY	0
/* This option switches read-only configuration. (0:Read/Write or 1:Read-only)
/  Read-only configuration removes writing API functions, f_write(), f_sync(),
/  f_unlink(), f_mkdir(), f_chmod(), f_rename(), f_truncate(), f_getfree()
/  and optional writing functions as well. */


#define FF_FS_MINIMIZE	0
/* This option defines minimization level to remove some basic API functions.
/
/   0: Basic functions are fully enabled.
/   1: f_stat(), f_getfree(), f_unlink(), f_mkdir(), f_truncate() and f_rename()
/      are removed.
/   2: f_opendir(), f_readdir() and f_closedir() are removed in addition to 1.
/   3: f_lseek() function is removed in addition to 2. */


#define FF_USE_FIND		0
/* This option switches filtered directory read functions, f_findfirst() and
/  f_findnext(). (0:Disable, 1:Enable 2:Enable with matching altname[] too) */


#define FF_USE_MKFS		0
/* This option switches f_mkfs(). (0:Disable or 1:Enable) */


#define FF_USE_FASTSEEK	0
/* This option switches fast seek feature. (0:Disable or 1:Enable) */


#define FF_USE_EXPAND	0
/* This option switches f_expand(). (0:Disable or 1:Enable) */


#define FF_USE_CHMOD	0
/* This option switches attribute control API functions, f_chmod() and f_utime().
/  (0:Disable or 1:Enable) Also FF_FS_READONLY needs to be 0 to enable this option. */


#define FF_USE_LABEL	0
/* This option switches volume label API functions, f_getlabel() and f_setlabel().
/  (0:Disable or 1:Enable) */


#define FF_USE_FORWARD	0
/* This option switches f_forward(). (0:Disable or 1:Enable) */


#define FF_USE_STRFUNC	0
#define FF_PRINT_LLI	0
#define FF_PRINT_FLOAT	0
#define FF_STRF_ENCODE	0
/* FF_USE_STRFUNC switches string API functions, f_gets(), f_putc(), f_puts() and
/  f_printf().
/
/   0: Disable. FF_PRINT_LLI, FF_PRINT_FLOAT and FF_STRF_ENCODE have no effect.
/   1: Enable without LF-CRLF conversion.
/   2: Enable with LF-CRLF conversion.
/
/  FF_PRINT_LLI = 1 makes f_printf() support long long argument and FF_PRINT_FLOAT = 1/2
/  makes f_printf() support floating point argument. These features want C99 or later.
/  When FF_LFN_UNICODE >= 1 with LFN enabled, string API functions convert the character
/  encoding in it. FF_STRF_ENCODE selects assumption of character encoding ON THE FILE
/  to be read/written via those functions.
/
/   0: ANSI/OEM in current CP
/   1: Unicode in UTF-16LE
/   2: Unicode in UTF-16BE
/   3: Unicode in UTF-8
*/


/*---------------------------------------------------------------------------/
/ Locale and Namespace Configurations
/---------------------------------------------------------------------------*/

#define FF_CODE_PAGE	932
/* This option specifies the OEM code page to be used on the target system.
/  Incorrect code page setting can cause a file open failure.
/
/   437 - U.S.
/   720 - Arabic
/   737 - Greek
/   771 - KBL
/   775 - Baltic
/   850 - Latin 1
/   852 - Latin 2
/   855 - Cyrillic
/   857 - Turkish
/   860 - Portuguese
/   861 - Icelandic
/   862 - Hebrew
/   863 - Canadian French
/   864 - Arabic
/   865 - Nordic
/   866 - Russian
/   869 - Greek 2
/   932 - Japanese (DBCS)
/   936 - Simplified Chinese (DBCS)
/   949 - Korean (DBCS)
/   950 - Traditional Chinese (DBCS)
/     0 - Include all code pages above and configured by f_setcp()
*/


#define FF_USE_LFN		0
#define FF_MAX_LFN		255
/* The FF_USE_LFN switches the support for LFN (long file name).
/
/   0: Disable LFN. FF_MAX_LFN has no effect.
/   1: Enable LFN with static working buffer on the BSS. Always NOT thread-safe.
/   2: Enable LFN with dynamic working buffer on the STACK.
/   3: Enable LFN with dynamic working buffer on the HEAP.
/
/  To enable the LFN, ffunicode.c needs to be added to the project. The LFN feature
/  requiers certain internal working buffer occupies (FF_MAX_LFN + 1) * 2 bytes and
/  additional (FF_MAX_LFN + 44) / 15 * 32 bytes when exFAT is enabled.
/  The FF_MAX_LFN defines size of the working buffer in UTF-16 code unit and it can
/  be in range of 12 to 255. It is recommended to be set 255 to fully support the LFN
/  specification.
/  When use stack for the working buffer, take care on stack overflow. When use heap
/  memory for the working buffer, memory management functions, ff_memalloc() and
/  ff_memfree() exemplified in ffsystem.c, need to be added to the project. */


#define FF_LFN_UNICODE	0
/* This option switches the character encoding on the API when LFN is enabled.
/
/   0: ANSI/OEM in current CP (TCHAR = char)
/   1: Unicode in UTF-16 (TCHAR = WCHAR)
/   2: Unicode in UTF-8 (TCHAR = char)
/   3: Unicode in UTF-32 (TCHAR = DWORD)
/
/  Also behavior of string I/O functions will be affected by this option.
/  When LFN is not enabled, this option has no effect. */


#define FF_LFN_BUF		255
#define FF_SFN_BUF		12
/* This set of options defines size of file name members in the FILINFO structure
/  which is used to read out directory items. These values should be suffcient for
/  the file names to read. The maximum possible length of the read file name depends
/  on character encoding. When LFN is not enabled, these options have no effect. */


#define FF_FS_RPATH		0
/* This option configures support for relative path feature.
/
/   0: Disable relative path and remove related API functions.
/   1: Enable relative path and dot names. f_chdir() and f_chdrive() are available.
/   2: f_getcwd() is available in addition to 1.
*/


#define FF_PATH_DEPTH	10
/*  This option defines maximum depth of directory in the exFAT volume. It is NOT
/   relevant to FAT/FAT32 volume.
/   For example, FF_PATH_DEPTH = 3 will able to follow a path "/dir1/dir2/dir3/file"
/   but a sub-directory in the dir3 will not able to be followed and set current
/   directory.
/   The size of filesystem object (FATFS) increases FF_PATH_DEPTH * 24 bytes.
/   When FF_FS_EXFAT == 0 or FF_FS_RPATH == 0, this option has no effect.
*/



/*---------------------------------------------------------------------------/
/ Drive/Volume Configurations
/---------------------------------------------------------------------------*/

#define FF_VOLUMES		2
/* Number of volumes (logical drives) to be used. (1-10) */


#define FF_STR_VOLUME_ID	0
#define FF_VOLUME_STRS		"SD","SD1","SD2"
/* FF_STR_VOLUME_ID switches support for volume ID in arbitrary strings.
/  When FF_STR_VOLUME_ID is set to 1 or 2, arbitrary strings can be used as drive
/  number in the path name. FF_VOLUME_STRS defines the volume ID strings for each
/  logical drive. Number of items must not be less than FF_VOLUMES. Valid
/  characters for the volume ID strings are A-Z, a-z and 0-9, however, they are
/  compared in case-insensitive. If FF_STR_VOLUME_ID >= 1 and FF_VOLUME_STRS is
/  not defined, a user defined volume string table is needed as:
/
/  const char* VolumeStr[FF_VOLUMES] = {"ram","flash","sd","usb",...
*/


#define FF_MULTI_PARTITION	1
/* This option switches support for multiple volumes on the physical drive.
/  By default (0), each logical drive number is bound to the same physical drive
/  number and only an FAT volume found on the physical drive will be mounted.
/  When this feature is enabled (1), each logical drive number can be bound to
/  arbitrary physical drive and partition listed in the VolToPart[]. Also f_fdisk()
/  will be available. */


#define FF_MIN_SS		512
#define FF_MAX_SS		512
/* This set of options configures the range of sector size to be supported. (512,
/  1024, 2048 or 4096) Always set both 512 for most systems, generic memory card and
/  harddisk, but a larger value may be required for on-board flash memory and some
/  type of optical media. When FF_MAX_SS is larger than FF_MIN_SS, FatFs is
/  configured for variable sector size mode and disk_ioctl() needs to implement
/  GET_SECTOR_SIZE command. */


#define FF_LBA64		0
/* This option switches support for 64-bit LBA. (0:Disable or 1:Enable)
/  To enable the 64-bit LBA, also exFAT needs to be enabled. (FF_FS_EXFAT == 1) */


#define FF_MIN_GPT		0x10000000
/* Minimum number of sectors to switch GPT as partitioning format in f_mkfs() and 
/  f_fdisk(). 2^32 sectors maximum. This option has no effect when FF_LBA64 == 0. */


#define FF_USE_TRIM		0
/* This option switches support for ATA-TRIM. (0:Disable or 1:Enable)
/  To enable this feature, also CTRL_TRIM command should be implemented to
/  the disk_ioctl(). */



/*---------------------------------------------------------------------------/
/ System Configurations
/---------------------------------------------------------------------------*/

#define FF_FS_TINY		0
/* This option switches tiny buffer configuration. (0:Normal or 1:Tiny)
/  At the tiny configuration, size of file object (FIL) is reduced FF_MAX_SS bytes.
/  Instead of private sector buffer eliminated from the file object, common sector
/  buffer in the filesystem object (FATFS) is used for the file data transfer. */


#define FF_FS_EXFAT		0
/* This option switches support for exFAT filesystem. (0:Disable or 1:Enable)
/  To enable exFAT, also LFN needs to be enabled. (FF_USE_LFN >= 1)
/  Note that enabling exFAT discards ANSI C (C89) compatibility. */


#define FF_FS_NORTC		0
#define FF_NORTC_MON	1
#define FF_NORTC_MDAY	1
#define FF_NORTC_YEAR	2025
/* The option FF_FS_NORTC switches timestamp feature. If the system does not have
/  an RTC or valid timestamp is not needed, set FF_FS_NORTC = 1 to disable the
/  timestamp feature. Every object modified by FatFs will have a fixed timestamp
/  defined by FF_NORTC_MON, FF_NORTC_MDAY and FF_NORTC_YEAR in local time.
/  To enable timestamp function (FF_FS_NORTC = 0), get_fattime() need to be added
/  to the project to read current time form real-time clock. FF_NORTC_MON,
/  FF_NORTC_MDAY and FF_NORTC_YEAR have no effect.
/  These options have no effect in read-only configuration (FF_FS_READONLY = 1). */


#define FF_FS_CRTIME	0
/* This option enables(1)/disables(0) the timestamp of the file created. When
/  set 1, the file created time is available in FILINFO structure. */


#define FF_FS_NOFSINFO	0
/* If you need to know the correct free space on the FAT32 volume, set bit 0 of
/  this option, and f_getfree() on the first time after volume mount will force
/  a full FAT scan. Bit 1 controls the use of last allocated cluster number.
/
/  bit0=0: Use free cluster count in the FSINFO if available.
/  bit0=1: Do not trust free cluster count in the FSINFO.
/  bit1=0: Use last allocated cluster number in the FSINFO if available.
/  bit1=1: Do not trust last allocated cluster number in the FSINFO.
*/


#define FF_FS_LOCK		0
/* The option FF_FS_LOCK switches file lock function to control duplicated file open
/  and illegal operation to open objects. This option must be 0 when FF_FS_READONLY
/  is 1.
/
/  0:  Disable file lock function. To avoid volume corruption, application program
/      should avoid illegal open, remove and rename to the open objects.
/  >0: Enable file lock function. The value defines how many files/sub-directories
/      can be opened simultaneously under file lock control. Note that the file
/      lock control is independent of re-entrancy. */


#define FF_FS_REENTRANT	0
#define FF_FS_TIMEOUT	1000
/* The option FF_FS_REENTRANT switches the re-entrancy (thread safe) of the FatFs
/  module itself. Note that regardless of this option, file access to different
/  volume is always re-entrant and volume control functions, f_mount(), f_mkfs()
/  and f_fdisk(), are always not re-entrant. Only file/directory access to
/  the same volume is under control of this featuer.
/
/   0: Disable re-entrancy. FF_FS_TIMEOUT have no effect.
/   1: Enable re-entrancy. Also user provided synchronization handlers,
/      ff_mutex_create(), ff_mutex_delete(), ff_mutex_take() and ff_mutex_give(),
/      must be added to the project. Samples are available in ffsystem.c.
/
/  The FF_FS_TIMEOUT defines timeout period in unit of O/S time tick.
*/

/* Zephyr specific configuration override */
/* The ZEPHYR_CONFIG_OVERRIDE should be given header file name that will contain
/  series of undefs and redefinitions of the FF_ identifiers from the ffconf.h
/  it needs to override
*/
#ifdef ZEPHYR_CONFIG_OVERRIDE
#define FFCONF_STRINGIZE_AGAIN(x) #x
#define FFCONF_STRINGIZE(x) FFCONF_STRINGIZE_AGAIN(x)
#include FFCONF_STRINGIZE(ZEPHYR_CONFIG_OVERRIDE)
#undef FFCONF_STRINGIZE
#undef FFCONF_STRINGIZE_AGAIN
#endif
/* End of Zephyr specific configuration override */

/*--- End of configuration options ---*/

Thank you !

[Amanda Hsieh]

Hi Jade, 

Zephyr doesn't provide a sample or related document on how to access the multi‑partition on the SD card, and our Zephyr expert is out of the office until next week. In the meantime, you can seek help on 
Zephyr Discord. 

Regards,
Amanda H.

[jade08]

Hello,

Thank you for your answer!
I will post my demand on Dicord waiting that someone or Zephyr expert can answer me !

Best regards,

Jade