rt_hw_spi_rc522_init

发布于 2021-12-29 20:47:23 浏览：823 订阅该版

各位大佬！
小弟在学习RT-THREAD, 遇到初始化失败！ 跟踪调试发现是if (device->bus->owner == device) 这个语句 条件不成立，也就是说Owner 不对？ 能否赐教 指点迷津， 不胜感激
```c
 static int rt_hw_spi_rc522_init()
{
    rt_err_t res = RT_EOK;

// Attach Device
    spi_cs.pin = MFRC522_SS_PIN;
    rt_pin_mode(spi_cs.pin, PIN_MODE_OUTPUT);
    res = rt_spi_bus_attach_device(&mfrc522_spi_dev, MFRC522_SPI_DEVICE_NAME, MFRC522_SPI_BUS_NAME, (void*)&spi_cs);
    if (res != RT_EOK)
    {
        rt_kprintf("[RC522] Failed to attach device %s\n", MFRC522_SPI_DEVICE_NAME);
        return res;
    }

// Set device SPI Mode
    struct rt_spi_configuration cfg = {0};
    cfg.data_width = 8;
    cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB | RT_SPI_NO_CS;
    cfg.max_hz = MFRC522_SPICLOCK;

rt_spi_configure(&mfrc522_spi_dev, &cfg);

return RT_EOK;
}
/* 导出到自动初始化 */
INIT_COMPONENT_EXPORT(rt_hw_spi_rc522_init);

rt_err_t rt_spi_configure(struct rt_spi_device        *device,
                          struct rt_spi_configuration *cfg)
{
    rt_err_t result;

RT_ASSERT(device != RT_NULL);

/* set configuration */
    device->config.data_width = cfg->data_width;
    device->config.mode       = cfg->mode & RT_SPI_MODE_MASK ;
    device->config.max_hz     = cfg->max_hz ;

if (device->bus != RT_NULL)
    {
        result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
        if (result == RT_EOK)

if (device->bus->owner == device)

{
                device->bus->ops->configure(device, &device->config);
            }

/* release lock */
            rt_mutex_release(&(device->bus->lock));
        }
    }

return RT_EOK;
}
```