// 用于进行I2C适配器和I2C设备之间的一组消息交互,i2c_transfer()一次可以传输多个i2c_msginti2c_transfer(structi2c_adapter *adap,structi2c_msg *msgs,intnum);// 调用i2c_transfer()函数完成一条写消息inti2c_master_send(structi2c_client *client,constchar*buf,intcount);// 调用i2c_transfer()函数完成...
i2c_transfer函数用于进行I2C适配器和I2C设备之间的一组消息交互。i2c_master_send函数和i2c_master_recv函数调用i2c_transfer函数分别完成一条写消息和一条读消息。而i2c_transfer函数实现中使用这句话adap->algo->master_xfer(adap,msgs,num);来调用i2c_algorithm中注册的master_xfer函数。 i2c_algorithm如下定义: 点...
i2c_transfer来来实现的, int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { unsigned long orig_jiffies; int ret, try; if (adap->algo->master_xfer) { #ifdef DEBUG for (ret = 0; ret < num; ret++) { dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=...
23. ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ); //等待传输完成,中断中会设置 24. if (ret == 0) { 25. dev_err(dev->dev, "controller timed out\n"); 26. i2c_gsc_init(dev); 27. ret = -ETIMEDOUT; 28. goto done; 29. } else if (ret < 0) 30....
[ 8760.039034] tegra-i2c 31b0000.i2c: i2c transfer timed out addr: 0x30 … root@ubuntu:/home/nvidia# i2cdetect -y 1 Warning: Can’t use SMBus Quick Write command, will skip some addresses 0 1 2 3 4 5 6 7 8 9 a b c d e f ...
[ 2268.459407] tegra-i2c tegra12-i2c.5: i2c transfer timed out, addr 0x0003, data 0x00 Error: Write failed It should recieve a NAK but it NOT, untill timeout (waited about 1 second). No signal occurs on I2C6 pins. While on other working I2C bus, for example, on i2c-4(Tegra...
[ 7843.562806] tegra-i2c 7000c400.i2c: i2c transfer timed out addr: 0x4 [ 7853.749749] tegra-i2c 7000c400.i2c: pio timed out addr: 0x5 tlen:12 rlen:4 Any help is welcome! Many thanks guys! Here is my code: Code: Select all #include <Arduino.h> #include <Wire.h> #define SLAVE...
(2)在实际的start transfer前,需要保证i2c bus是idle状态,如果此时不是idle,且busy了一段时间,那就可以复位i2c bus了。 <drivers/i2c/busses/i2c-designware-common.c> 304 int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev) 305 { 306 int timeout = TIMEOUT; 307 308 while (dw_readl(dev,...
在IIC子系统中,用struct i2c_client来描述一个具体的IIC设备(IIC从机)。73行,如果没有IIC设备的话就直接返回0,表示匹配不成功。 77行,用of的方式进行匹配,应该是设备树方面的,具体没了解过。 82行,如果驱动的id table存在则调用83行的i2c_match_id函数进行匹配: ...
Linux内核开发者为了让驱动开发工程师在内核中方便的添加自己的I2C设备驱动程序,更容易的在linux下驱动自己的I2C接口硬件,进而引入了I2C总线框架。与Linux下的platform虚拟总线不同的是,I2C是实际的物理总线,所以I2C总线框架也是Linux下总线、设备、驱动模型的产物。