Reading SD card on nRF9160dk

[Jagruti]

Hello,

I want to read two files from SD card using nRF9160dk. I tried this code ncs/zephyr/samples/subsys/fs/fat_fs.

The Code:

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/*

* Copyright (c) 2019 Tavish Naruka <[e-mail]>

*

* SPDX-License-Identifier: Apache-2.0

*/

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

#include <zephyr.h>

#include <device.h>

#include <disk/disk_access.h>

#include <logging/log.h>

#include <fs/fs.h>

#include <ff.h>

LOG_MODULE_REGISTER(main);

static int lsdir(const char *path);

static FATFS fat_fs;

/* mounting info */

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

/*
 * Copyright (c) 2019 Tavish Naruka <[e-mail]>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

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

#include <zephyr.h>
#include <device.h>
#include <disk/disk_access.h>
#include <logging/log.h>
#include <fs/fs.h>
#include <ff.h>

LOG_MODULE_REGISTER(main);

static int lsdir(const char *path);

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

/*
*  Note the fatfs library is able to mount only strings inside _VOLUME_STRS
*  in ffconf.h
*/
static const char *disk_mount_pt = "/SD:";

void main(void)
{
	/* raw disk i/o */
	do {
		static const char *disk_pdrv = "SD";
		u64_t memory_size_mb;
		u32_t block_count;
		u32_t block_size;

		if (disk_access_init(disk_pdrv) != 0) {
			LOG_ERR("Storage init ERROR!");
			break;
		}

		if (disk_access_ioctl(disk_pdrv,
				DISK_IOCTL_GET_SECTOR_COUNT, &block_count)) {
			LOG_ERR("Unable to get sector count");
			break;
		}
		LOG_INF("Block count %u", block_count);

		if (disk_access_ioctl(disk_pdrv,
				DISK_IOCTL_GET_SECTOR_SIZE, &block_size)) {
			LOG_ERR("Unable to get sector size");
			break;
		}
		printk("Sector size %u\n", block_size);

		memory_size_mb = (u64_t)block_count * block_size;
		printk("Memory Size(MB) %u\n", (u32_t)memory_size_mb>>20);
	} while (0);

	mp.mnt_point = disk_mount_pt;

	int res = fs_mount(&mp);

	if (res == FR_OK) {
		printk("Disk mounted.\n");
		lsdir(disk_mount_pt);
	} else {
		printk("Error mounting disk.\n");
	}

	while (1) {
		k_sleep(1000);
	}
}

static int lsdir(const char *path)
{
	int res;
	struct fs_dir_t dirp;
	static struct fs_dirent entry;

	/* 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);
		}
	}

	/* Verify fs_closedir() */
	fs_closedir(&dirp);

	return res;
}

I am getting the following error:

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***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb *****

[00:00:00.024,078] ·[0m<inf> spi_nrfx_spim: CS control inhibited (no GPIO device)·[0m

[00:00:05.039,306] ·[1;31m<err> main: Storage init ERROR!·[0m

Error mounting disk.

[00:00:10.054,565] ·[1;31m<err> fs: fs mount error (-5)·[0m

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb *****
[00:00:00.024,078] <inf> spi_nrfx_spim: CS control inhibited (no GPIO device)
[00:00:05.039,306] <err> main: Storage init ERROR!
Error mounting disk.
[00:00:10.054,565] <err> fs: fs mount error (-5)

nrf9160_pca10090ns.overlay:

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/*

* Copyright (c) 2019 Tavish Naruka <[e-mail]>

*

* SPDX-License-Identifier: Apache-2.0

*/

&spi3 {

status = "okay";

cs-gpios = <&gpio0 16 0>;

sdhc0: sdhc@0 {

compatible = "zephyr,mmc-spi-slot";

reg = <0>;

status = "okay";

label = "SDHC0";

spi-max-frequency = <24000000>;

};

};

&spi3 {

status = "okay";

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

/*
 * Copyright (c) 2019 Tavish Naruka <[e-mail]>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

&spi3 {
        status = "okay";
        cs-gpios = <&gpio0 16 0>;

        sdhc0: sdhc@0 {
                compatible = "zephyr,mmc-spi-slot";
                reg = <0>;
                status = "okay";
                label = "SDHC0";
                spi-max-frequency = <24000000>;
        };
};

&spi3 {
        status = "okay";
        sck-pin = <19>;
        mosi-pin = <18>;
        miso-pin = <17>;
};

I checked the voltage levels at SPI_3 pins. Pin 16, 17, 18 shows 3V but 19 which is SCK is at 0V. I am not understanding why it is at 0V.

Why there is error? What else I need to do?

[Øyvind]

Hello, 

What version of NCS are you using? 

Kind regards,
Øyvind

[Jagruti]

I am working with ncs_tag v1.0.0.

[Jagruti]

Yes I have connected the SD card.

OK I will not change the zephyr branch. I will try to ask in the Zephyr community. Thanks for the help.

[Jagruti]

Instead of disk_access_spi_sdhc, can I use app_sdcard on nRF9160? I guess app_sdcard uses nrf legacy drivers. My collegue has used app_sdcard on nRF52840DK to interface with SD card. So is it possible to use with nRF9160DK instead of Zephyr drivers?

[Jagruti]

Hello,

I downloaded the merged.hex file which you provided and I think it is working. LED on SD card is continuously blinking which means it is continuously receiving the clock signal.

When I download my merged.hex file, LED stops working after 10-15sec indicating that SD card is not mounted and it stops receiving clock signal.

I compared both merged.hex files and they are different.

I am using the same ncs tag, overlay file and prj.conf file as yours. Still it is different.

I think in my program, spi is never initialized. Can you please guide me for this problem?

[Øyvind]

Hello, 

Jagruti said:

Instead of disk_access_spi_sdhc, can I use app_sdcard on nRF9160? I guess app_sdcard uses nrf legacy drivers. My collegue has used app_sdcard on nRF52840DK to interface with SD card. So is it possible to use with nRF9160DK instead of Zephyr drivers?

 The app_sdcard is a library from the nRF5 SDK. You can use this but will need to port to nRF9160.

Can you please provide more information about your setup? Can you take a picture to show how you have connected?

Have you ensured that the pins are correctly configured in the board controller? P0.13 on the board controller must be set to enable these pins.

To minimize editing the board controller, can you please route SPI3 to P0.10 - P0.13  instead? These are found on P19 and should be directly available.

Kind regards,
Øyvind

[Øyvind]

Hello,

Attached is a working project using SPI3. The output is shown in the image.

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&spi3 {

compatible = "nordic,nrf-spim";

status = "okay";

sck-pin = <10>;

mosi-pin = <11>;

miso-pin = <12>;

cs-gpios = <&gpio0 13 0>;

sdhc0: sdhc@0 {

compatible = "zephyr,mmc-spi-slot";

reg = <0>;

status = "okay";

label = "SDHC0";

spi-max-frequency = <24000000>;

};

};

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

&spi3 {
        compatible = "nordic,nrf-spim";
        status = "okay";
        sck-pin = <10>;
        mosi-pin = <11>;
        miso-pin = <12>;

        cs-gpios = <&gpio0 13 0>;

        sdhc0: sdhc@0 {
                compatible = "zephyr,mmc-spi-slot";
                reg = <0>;
                status = "okay";
                label = "SDHC0";
                spi-max-frequency = <24000000>;
        };
};

fat_fs.zip


Let me know how it works for you!

Kind regards,
Øyvind

[Jagruti]

Thanks for the project. I checked it, but still that error shows. Can you tell me which SD card is being used and how it is connected. Now the drivers and program is same still that error is there, it means there might be the problem in SD card board. But this same breakout board is used to interface with nRF52840DK and with that it is working fine.

[Jagruti]

Hi,

The problem is solved. I am able to mount the SD card.

I followed this thread https://devzone.nordicsemi.com/f/nordic-q-a/59430/nrf9160-sd-card-access-via-spi/242347#242347 and added CONFIG_SPI_NRFX_RAM_BUFFER_SIZE=8 in prj.conf file. It is working.

Thanks a lot for your help.

[Øyvind]

Very glad to hear that you solved the issue!

Kind regards,
Øyvind