Problem with QSPI driver W25Q64FV

[doltcat]

Hi,All：

I have a customized nRF52840 board with an external NOR Flash (W25Q64FV), and I have some confusion when conducting read and write data testing.
This is my device tree configuration:

This is my test code:

void flash_stress_test(void){
 const struct device *flash_dev = DEVICE_DT_GET(FLASH_DEV);
    if (!device_is_ready(flash_dev))
    {
        printk("QSPI Flash initialization failed. Please check the device tree pins\n");
        return;
    }

    uint8_t write_buf[BUF_SIZE] = {0};
    uint8_t read_buf[BUF_SIZE] = {0};
    int ret;
    uint32_t loop_cnt = 0;

    printk("==== Start Flash stability testing ====\n");
    if (TEST_LOOP_COUNT > 0)
    {
        printk("Preset total number of cycles: %d\n", TEST_LOOP_COUNT);
    }
    else
    {
        printk("Infinite loop mode, power off and stop\n");
    }
    while (1)
    {
        loop_cnt++;
        printk("\n---------- The %u round of testing ----------\n", loop_cnt);        
        sys_rand_get(write_buf, BUF_SIZE);
        printk("Generate random numbers:");
        for(int i=0;i<BUF_SIZE;i++){
            printk("0x%02X ", write_buf[i]);
        }
        printk("\n");
        
        ret = flash_erase(flash_dev, TEST_OFFSET, 4096U);
        if (ret != 0)
        {
            printk("【Error】Sector erase failed, err=%d Loop: %u\n", ret, loop_cnt);
            while (1) k_sleep(K_SECONDS(1));
        }        
        ret = flash_write(flash_dev, TEST_OFFSET, write_buf, BUF_SIZE);
        
        if (ret != 0)
        {
            printk("【Error】Data write failed, err=%d Loop:%u\n", ret, loop_cnt);
            while (1) k_sleep(K_SECONDS(1));
        }        
        ret = flash_read(flash_dev, TEST_OFFSET, read_buf, BUF_SIZE);
        if (ret != 0)
        {
            printk("【Error】Data read failed, err=%d Loop:%u\n", ret, loop_cnt);
            while (1) k_sleep(K_SECONDS(1));
        }        
        printk("read data:");
        for (int i = 0; i < BUF_SIZE; i++)
        {
            printk("0x%02X ", read_buf[i]);
        }
        printk("\n");        
        if (memcmp(write_buf, read_buf, BUF_SIZE) != 0)
        {
            printk("【Error】Read and write data mismatch! Loop:%u\n", loop_cnt);
            printk("Written data");
            for (int i = 0; i < BUF_SIZE; i++)
            {
                printk("0x%02X ", write_buf[i]);
            }
            printk("\n");
            
            while (1) {printk("Ddddd\n");k_sleep(K_SECONDS(1));}
        }
        printk("This round of verification has passed");
        if (TEST_LOOP_COUNT != 0 && loop_cnt >= TEST_LOOP_COUNT)
        { break;   }        
        k_sleep(K_MSEC(5));
    }
    printk("\n===== All %u round pressure tests passed,  =====\n", loop_cnt);
}

然后向设备树添加：

writeoc = “pp4io”;
readoc = “read4io”;
启用Quad SPI时，所有数据输出均为数据0xFF，如图所示

注释后，所有读写数据都正常。我认为是：四联启用要求=“S2B1v1”;不起作用（QE）或其他原因。

另外，我的设备树配置是否正常，代码是否存在问题，请给我一些建议

谢谢

[Kazi Afroza Sultana]

Hello,

The log shows the output data is all zero. So, nothing is programmed on the chip. You may try to read single line first to check if MOSI and MISO line are correctly wired.

w25q64fv: w25q64fv@0 {
compatible = "nordic,qspi-nor";
reg = <0>;
sck-frequency = <4000000>;
jedec-id = [ef 40 17];
size = <0x800000>; /* bits = 8MB * 8 */
writeoc = "pp"; /* single-line page program */
readoc = "fastread"; /* single-line fast read */
status = "okay";
/* remove rest of the settings for this first checking */
};

Thanks.

BR

Kazi

[doltcat]

I have already tested it,
writeoc = "pp4o";
writeoc = "pp"
It can be read and written normally,
Only when writeoc = "pp4io"; Unavailable

Thanks.