QSPI SFUD

SFUD操作w25q256,无法正常读写，但是若用裸机对W25Q256执行一次写入后就能正常操作了，这个是什么原因呢？

发布于 2025-03-28 16:14:53 浏览：230 订阅该版

2 个回答

winfeng 认证专家 2025-03-29

这家伙很懒，什么也没写！

yangbo18416 2025-04-02

这家伙很懒，什么也没写！

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yangbo18416 2025-07-22

这家伙很懒，什么也没写！

问题原因在于使用QSPI时需要设置进入QSPI模式，

```c
    stm32_qspi_bus_attach_device("qspi1", FLASH_DEVICE_NAME, GET_PIN(G,6), 4, w25qxx_enter_qspi_mode, RT_NULL);

```
写好相关函数后，需要修改qspi_core.c的216函底层接口函数，具体参考一下连接
[https://club.rt-thread.org/ask/question/2e1814eca0fbe9e1.html](https://club.rt-thread.org/ask/question/2e1814eca0fbe9e1.html)

进入QSPI模式代码参考如下

```c
#include "fal_cfg.h"
#include "spi_flash_sfud.h"
#include "drv_qspi.h"
#include "easyflash.h"
#include "ulog_easyflash.h"
#include "fal.h"
#define FLASH_DEVICE_NAME "norflash"
rt_spi_flash_device_t sf_flash_device;
static char w25qxx_read_status_register2(struct rt_qspi_device *device)
{
    /* 0x35 read status register2 */
    char instruction = 0x35, status;

rt_qspi_send_then_recv(device, &instruction, 1, &status, 1);

return status;
}

static void w25qxx_write_enable(struct rt_qspi_device *device)
{
    /* 0x06 write enable */
    char instruction = 0x06;

rt_qspi_send(device, &instruction, 1);
}

static void w25qxx_enter_qspi_mode(struct rt_qspi_device *device)
{
    char status = 0;
    /* 0x38 enter qspi mode */
    char instruction = 0x38;
    char write_status2_buf[2] = {0};
    char cmd_write[8] = {0};

/* 0x31 write status register2 */
    write_status2_buf[0] = 0x31;

status = w25qxx_read_status_register2(device);
    if (!(status & 0x02))
    {
        status |= 1 << 1;
        w25qxx_write_enable(device);
        write_status2_buf[1] = status;
        rt_qspi_send(device, &write_status2_buf, 2);
        rt_kprintf("flash already enter qspi mode\n");
        rt_thread_mdelay(10);
    }
}
int spi_flash_init(void)
{
    stm32_qspi_bus_attach_device("qspi1", FLASH_DEVICE_NAME, GET_PIN(G,6), 4, w25qxx_enter_qspi_mode, RT_NULL);
    /* init W25Q256 */
    // spi_flash_dev_name 需要用配置文件内的，spi_dev_name实际是SPI挂在参数
    sf_flash_device = rt_sfud_flash_probe(FAL_USING_NOR_FLASH_DEV_NAME, FLASH_DEVICE_NAME);
    if(sf_flash_device != RT_NULL)
    {
        rt_kprintf("rt sfud flash success\n");
        return 0;
    }
    else
    {
        rt_kprintf("rt sfud flash error\n");
        return -1;
    }
}
```