spi flash片选引脚无法被拉低

发布于 2024-02-05 18:52:51 浏览：729 订阅该版

我用的芯片是STM32F407ZGT6，RT Thread版本5.0.2，spi flash挂载在spi1总线，设备号是spi10

```c
int w25qxx_init(void)
{
    struct rt_spi_device *spi_device = RT_NULL;

spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
    if(RT_NULL == spi_device)
    {
      LOG_E("Failed to malloc the spi device.");
      return -RT_ENOMEM;
    }
    struct stm32_hw_spi_cs cs_pin =
    {
        .GPIOx = GPIOG,
        .GPIO_Pin = GPIO_PIN_6
    };
    if (RT_EOK != rt_spi_bus_attach_device_cspin(spi_device, "spi10", "spi1",rt_pin_get("PG.6"), &cs_pin))
    {
        LOG_E("Failed to attach the spi device.");
        return -RT_ERROR;
    }
    if (RT_NULL == rt_sfud_flash_probe("W25Q128", "spi10"))
    {
        LOG_E("Failed to probe the W25Q128.");
        return -RT_ERROR;
    };
}

INIT_COMPONENT_EXPORT(w25qxx_init);
```
通过手动输入`sf probe spi10`命令，并用逻辑分析仪观测，发现PG6引脚没有被拉低
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20240205/fac0518b2c464645e03acaf20c41c36d.png)
这里应该是发送读flash ID命令0x9F