RE: flash erase

Einar Thorsrud — Tue, 05 Aug 2025 08:18:51 GMT

Hi,

I have had a look at the code in your latest post, and do not see anything obviously wrong. Perhaps the next step could be to debug and step down into flash_write() and flash_read() and further down as far as you can get to track the data and see if you see where somehting unexpected happens? Also, it could be interesting to check the SPI lines with a logic analyzer (and enable SPI protocol decoding) and see what is actually being transmitted between the nRF and the w25q64.

RE: flash erase

venkat242 — Mon, 04 Aug 2025 12:45:05 GMT

pls kindly chekck why read is failed

RE: flash erase

venkat242 — Mon, 04 Aug 2025 12:44:17 GMT

sry now i changed main.c as

#include <zephyr/kernel.h>

#include <zephyr/sys/printk.h>

#include <zephyr/device.h>

#include <zephyr/drivers/gpio.h>

#include <zephyr/drivers/flash.h>

#include <nrfx_qspi.h>

#include <hal/nrf_qspi.h>

#include <string.h>

// JEDEC ID command

#define CMD_READ_JEDEC_ID 0x9F

// LED aliases

#define LED1_NODE DT_NODELABEL(led1)

#define LED0_NODE DT_NODELABEL(led0)

#define LED2_NODE DT_NODELABEL(led2)

#define LEDB_NODE DT_NODELABEL(ledbacklight)

static const struct gpio_dt_spec led1 = GPIO_DT_SPEC_GET(LED1_NODE, gpios);

static const struct gpio_dt_spec led0 = GPIO_DT_SPEC_GET(LED0_NODE, gpios);

static const struct gpio_dt_spec led2 = GPIO_DT_SPEC_GET(LED2_NODE, gpios);

static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LEDB_NODE, gpios);

// Flash alias

#define FLASH_NODE DT_NODELABEL(w25q64)

// Test config

#define TEST_OFFSET 0x00010000 // must be 4KB aligned

#define TEST_SECTOR_SIZE 4096

#define TEST_DATA_BYTE 0x55

void read_qspi_jedec_id(void)

{

nrfx_err_t err_code;

uint8_t read_buf[3] = {0};

nrf_qspi_cinstr_conf_t cinstr_cfg = {

.opcode = CMD_READ_JEDEC_ID,

.length = NRF_QSPI_CINSTR_LEN_4B, // 1 command + 3 data

.io2_level = true,

.io3_level = true,

.wipwait = true,

.wren = false

};

err_code = nrfx_qspi_cinstr_xfer(&cinstr_cfg, NULL, read_buf);

if (err_code != NRFX_SUCCESS) {

printk("Failed to read JEDEC ID: %d\n", err_code);

return;

}

printk("JEDEC ID: %02X %02X %02X\n", read_buf[0], read_buf[1], read_buf[2]);

}

void flash_test_1byte(const struct device *flash_dev)

{

uint8_t tx_byte = TEST_DATA_BYTE;

uint8_t rx_byte = 0x00;

int rc;

printk("Erasing 4KB sector at 0x%08x...\n", TEST_OFFSET);

rc = flash_erase(flash_dev, TEST_OFFSET, TEST_SECTOR_SIZE);

if (rc) {

printk("Erase failed: %d\n", rc);

return;

}

printk("Writing 0x%02X to flash...\n", tx_byte);

rc = flash_write(flash_dev, TEST_OFFSET, &tx_byte, sizeof(tx_byte));

if (rc) {

printk("Write failed: %d\n", rc);

return;

}

rc = flash_read(flash_dev, TEST_OFFSET, &rx_byte, sizeof(rx_byte));

if (rc) {

printk("Read failed: %d\n", rc);

return;

}

printk("Read back from 0x%08x = 0x%02X\n", TEST_OFFSET, rx_byte);

if (rx_byte == tx_byte) {

printk("QSPI: ✅ Byte matched!\n");

} else {

printk("QSPI: ❌ Byte mismatch! Expected 0x%02X\n", tx_byte);

}

void main(void)

{

printk("QSPI JEDEC ID Read & Flash Byte Test\n");

const struct device *flash_dev = DEVICE_DT_GET(FLASH_NODE);

if (!device_is_ready(flash_dev)) {

printk("Flash device not ready!\n");

return;

}

if (!gpio_is_ready_dt(&led) || !gpio_is_ready_dt(&led1) ||

!gpio_is_ready_dt(&led0) || !gpio_is_ready_dt(&led2)) {

printk("One or more LEDs not ready\n");

return;

}

gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);

gpio_pin_configure_dt(&led1, GPIO_OUTPUT_ACTIVE);

gpio_pin_configure_dt(&led0, GPIO_OUTPUT_ACTIVE);

gpio_pin_configure_dt(&led2, GPIO_OUTPUT_ACTIVE);

gpio_pin_set_dt(&led, 1);

gpio_pin_set_dt(&led1, 1);

gpio_pin_set_dt(&led0, 1);

gpio_pin_set_dt(&led2, 0);

k_sleep(K_MSEC(10)); // Wait for flash ready

read_qspi_jedec_id();

flash_test_1byte(flash_dev);

} where i got in terminal as