samples/drivers/spi_flash/src/main.c

/*
 * Copyright (c) 2016 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/zephyr.h>
#include <zephyr/drivers/flash.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <stdio.h>
#include <string.h>

#if defined(CONFIG_BOARD_ADAFRUIT_FEATHER_STM32F405)
#define SPI_FLASH_TEST_REGION_OFFSET 0xf000
#elif defined(CONFIG_BOARD_ARTY_A7_ARM_DESIGNSTART_M1) || \
	defined(CONFIG_BOARD_ARTY_A7_ARM_DESIGNSTART_M3)
/* The FPGA bitstream is stored in the lower 536 sectors of the flash. */
#define SPI_FLASH_TEST_REGION_OFFSET \
	DT_REG_SIZE(DT_NODE_BY_FIXED_PARTITION_LABEL(fpga_bitstream))
#elif defined(CONFIG_BOARD_NPCX9M6F_EVB) || \
	defined(CONFIG_BOARD_NPCX7M6FB_EVB)
#define SPI_FLASH_TEST_REGION_OFFSET 0x7F000
#else
#define SPI_FLASH_TEST_REGION_OFFSET 0xff000
#endif
#define SPI_FLASH_SECTOR_SIZE        4096

void main(void)
{
	const uint8_t expected[] = { 0x55, 0xaa, 0x66, 0x99 };
	const size_t len = sizeof(expected);
	uint8_t buf[sizeof(expected)];
	const struct device *flash_dev;
	int rc;

	flash_dev = DEVICE_DT_GET(DT_ALIAS(spi_flash0));

	if (!device_is_ready(flash_dev)) {
		printk("%s: device not ready.\n", flash_dev->name);
		return;
	}

	printf("\n%s SPI flash testing\n", flash_dev->name);
	printf("==========================\n");


	/* Write protection needs to be disabled before each write or
	 * erase, since the flash component turns on write protection
	 * automatically after completion of write and erase
	 * operations.
	 */
	printf("\nTest 1: Flash erase\n");

	/* Full flash erase if SPI_FLASH_TEST_REGION_OFFSET = 0 and
	 * SPI_FLASH_SECTOR_SIZE = flash size
	 */
	rc = flash_erase(flash_dev, SPI_FLASH_TEST_REGION_OFFSET,
			 SPI_FLASH_SECTOR_SIZE);
	if (rc != 0) {
		printf("Flash erase failed! %d\n", rc);
	} else {
		printf("Flash erase succeeded!\n");
	}

	printf("\nTest 2: Flash write\n");

	printf("Attempting to write %zu bytes\n", len);
	rc = flash_write(flash_dev, SPI_FLASH_TEST_REGION_OFFSET, expected, len);
	if (rc != 0) {
		printf("Flash write failed! %d\n", rc);
		return;
	}

	memset(buf, 0, len);
	rc = flash_read(flash_dev, SPI_FLASH_TEST_REGION_OFFSET, buf, len);
	if (rc != 0) {
		printf("Flash read failed! %d\n", rc);
		return;
	}

	if (memcmp(expected, buf, len) == 0) {
		printf("Data read matches data written. Good!!\n");
	} else {
		const uint8_t *wp = expected;
		const uint8_t *rp = buf;
		const uint8_t *rpe = rp + len;

		printf("Data read does not match data written!!\n");
		while (rp < rpe) {
			printf("%08x wrote %02x read %02x %s\n",
			       (uint32_t)(SPI_FLASH_TEST_REGION_OFFSET + (rp - buf)),
			       *wp, *rp, (*rp == *wp) ? "match" : "MISMATCH");
			++rp;
			++wp;
		}
	}
}