N32G455使用w5500库初始化失败

发布于 2023-04-13 15:34:43 浏览：469 订阅该版

现在问题是这样的
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230413/9972be595dc8e8a22a3cd8c3d980b03c.png)
会有这样报错

```
[E/wiz] Wiznet chip not detected
[E/wiz] RT-Thread WIZnet package (V2.1.0) initialize failed(-1).
```
然后逻辑分析仪看了一下时序

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230413/51053f455e3381703ab8ba3ce28ae8a6.png.webp)

cs引脚明显一直拉高。
在wiz.c中，需要用户对接`extern rt_err_t rt_hw_spi_device_attach(const char *bus_name, const char *device_name, GPIO_TypeDef *cs_gpiox, uint16_t cs_gpio_pin);`这句话
这里我的实现如下
```c
struct rt_spi_device *spi_device;

/* attach the device to spi bus*/
    spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
    RT_ASSERT(spi_device != RT_NULL);

rt_base_t cs_pin = GET_PIN(A, 15);
    rt_pin_mode(cs_pin, PIN_MODE_OUTPUT);

result = rt_spi_bus_attach_device(spi_device, WIZ_SPI_DEVICE, "spi3", (void*)cs_pin);

if (result != RT_EOK)
    {
        LOG_E("%s attach to %s faild, %d\n", "spi3", WIZ_SPI_DEVICE, result);
    }

RT_ASSERT(result == RT_EOK);

LOG_D("%s attach to %s done", device_name, bus_name);
```
针对rt_spi_bus_attach_device函数的最后一个参数我个人的理解有限，我照着别的ic源码传入了pin脚，这里好像没有起作用