SPI设备在rt_spi_configure时出错

发布于 2019-03-01 20:40:43 浏览：3305 订阅该版

请教各位大神。用的是**rt-thread-4.0.0\bsp\stm32\stm32f407-atk-explorer**这个开发板，在配置spi总线时出错。下面是初始化代码
int rt_hw_spi_dac_init(void)
{
        rt_err_t result;

AD568X_Device->spiDevice = (struct rt_spi_device *)rt_device_find(AD568X_SPI_BUS_NAME);
        if(AD568X_Device->spiDevice != RT_NULL)
        {
                rt_kprintf("spi device find succeed! <br>");
        }
        else
        {
                rt_kprintf("spi device find failed! <br>");
        }
        
        //设置AD568X的LDAC引脚为低，则DAC的输出数据会实时更新。
        rt_pin_mode(AD568X_LDAC,PIN_MODE_OUTPUT);
        rt_pin_write(AD568X_LDAC,PIN_LOW);
        
        //使能GPIOB时钟
        __HAL_RCC_GPIOB_CLK_ENABLE();
        
        //将设备挂载到总线上，并初始化了片选引脚        PB12
        result = rt_hw_spi_device_attach(AD568X_SPI_BUS_NAME, AD568X_SPI_DEVICE_NAME, GPIOB, GPIO_PIN_12);
        if(result != RT_EOK)
        {
                rt_kprintf("spi device attach failed! <br>");
        }
        
        //进行模式配置
       {
               struct rt_spi_configuration cfg;
        
               cfg.data_width = 8;
               cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
               cfg.max_hz = 20 * 1000 *1000;                           /* 20M */

rt_spi_configure(AD568X_Device->spiDevice, &cfg);
       }

/* register device */
    AD568X_Device->Device.type    = RT_Device_Class_Block;
    AD568X_Device->Device.init    = AD568X_init;
    AD568X_Device->Device.open    = AD568X_open;
    AD568X_Device->Device.close   = AD568X_close;
    AD568X_Device->Device.read    = AD568X_read;
    AD568X_Device->Device.write   = AD568X_write;
    AD568X_Device->Device.control = AD568X_control;

/* no private */
    AD568X_Device->Device.user_data = RT_NULL;
        
        
        rt_device_register(&AD568X_Device->Device, AD568X_SPI_DEVICE_NAME,
                       RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);

return RT_EOK;

}

/* 导出到自动初始化 */
INIT_BOARD_EXPORT(rt_hw_spi_dac_init);

如果进行**rt_spi_configure(AD568X_Device->spiDevice, &cfg);**这个配置的时候就会出现下面这样的错误 。

![QQ截图20190301203620.png](/uploads/201903/01/203641k3qtzusqabset736.png)
如果不配置的话会是这样。
![QQ截图20190301203805.png](/uploads/201903/01/203823vkfiixwkt0edv4jx.png)

请问下哪位大神知道呀，小弟不胜感激。

10 个回答

yqiu 2019-03-01

这家伙很懒，什么也没写！

aozima 2019-03-01

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

春和景明 2019-03-03

这家伙很懒，什么也没写！

liuyuewei 2019-03-04

这家伙很懒，什么也没写！

>太早了，调整为系统启动后再初始化ADC。

---

我把它改到mian()里进行了初始化。
int main(void)
{
//	thread_init_adc();
//	thread_init_led();
	rt_hw_spi_dac_init();
        return RT_EOK;
}
也不行，会出现总线错误。
之后把这个初始化函数改成这样，由于之前SPI总线和SPI设备名字写的不清楚，重新改一下。
int rt_hw_spi_dac_init(void)
{
	rt_err_t result;

//设置AD568X的LDAC引脚为低，则DAC的输出数据会实时更新。
	rt_pin_mode(AD568X_LDAC,PIN_MODE_OUTPUT);
	rt_pin_write(AD568X_LDAC,PIN_LOW);
	
	//使能GPIOB时钟
	__HAL_RCC_GPIOB_CLK_ENABLE();
	
	//将设备挂载到总线上，并初始化了片选引脚	PB12
	result = rt_hw_spi_device_attach("spi2", "spi20", GPIOB, GPIO_PIN_12);
	if(result != RT_EOK)
	{
		rt_kprintf("spi device attach failed!\r\n");
	}
	
	
	AD568X_Device->spiDevice = (struct rt_spi_device *)rt_device_find("spi20");
	
	if(AD568X_Device->spiDevice != RT_NULL)
	{
		rt_kprintf("spi device find succeed!\r\n");
	}
	else
	{
		rt_kprintf("spi device find failed!\r\n");
	}
	
	
	{
		struct rt_spi_configuration cfg;
		
		cfg.data_width = 8;
		cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
		cfg.max_hz = 20 * 1000 *1000;                           /* 20M */

rt_spi_configure(AD568X_Device->spiDevice, &cfg);
	}	
	
	
	//进行模式配置
//	rt_hw_spi_dac_cfg();
	
	/* register device */
    AD568X_Device->Device.type    = RT_Device_Class_Block;
    AD568X_Device->Device.init    = AD568X_init;
    AD568X_Device->Device.open    = AD568X_open;
    AD568X_Device->Device.close   = AD568X_close;
    AD568X_Device->Device.read    = AD568X_read;
    AD568X_Device->Device.write   = AD568X_write;
    AD568X_Device->Device.control = AD568X_control;

/* no private */
    AD568X_Device->Device.user_data = RT_NULL;
	
	
	rt_device_register(&AD568X_Device->Device, "AD568x",
                       RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);

return RT_EOK;
}
但是依然会有总线错误的问题，之后进行代码跟踪。一级一级的往里进。
rt_spi_configure(AD568X_Device->spiDevice, &cfg);
result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);
在这个函数的时候出现了问题。
看看知道是怎么回事吗。