1、struct i2c_rdwr_ioctl_data结构体 * This is the structure as used in the I2C_RDWR ioctl call */ struct i2c_rdwr_ioctl_data { struct i2c_msg __user *msgs; /* pointers to i2c_msgs */ __u32 nmsgs; /* number of i2c_msgs */ }; 1. 2. 3. 4. 5. msgs使用前必须先分配一下...
O_RDWR);if(i2cFd<0){printf("Can't open\n");exit(1);}if(ioctl(i2cFd,I2C_SLAVE,i2c_addr)<0){printf("fail to set i2c device slave address!");close(i2cFd);return-1;}i2c_write(i2cFd,reg_addr,send_data);}
i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; i2c->tx_setup = 50; ... ret = i2c_add_numbered_adapter(&i2c->adap); 2.需要填充i2c-algorithm结构体。i2c-algorithm结构体即指定i2c通信算法, static const struct i2c_algorithm s3c24xx_i2c_algorithm = { .master_xfer = s3c24xx_i2c_xfe...
select [IO多路复用的机制] # select每次遍历都需要把fd集合从用户态拷贝到内核态,开销较大,受系统限制最大1024 select.select(rlist, wlist, xlist[, timeout]) # poll和select很像 通过一个pollfd数组向内核传递需要关注的事件,没有描述符1024限制 select.poll() # 创建epoll句柄,注册监听事件,通过回调函数...
int ioctl(int fd, ind cmd, …); 其中fd是用户程序打开设备时使用open函数返回的文件标示符,cmd是用户程序对设备的控制命令,至于后面的省略号,那是一些补充参数,一般最多一个,这个参数的有无和cmd的意义相关。 ioctl函数是文件结构中的一个属性分量,就是说如果你的驱动程序提供了对ioctl的支持,用户就可以在用...
问I2C_SLAVE ioctl用途EN功能: 控制I/O设备 ，提供了一种获得设备信息和向设备发送控制参数的手段。用...
closefd exit 读取I2C总线频率ret ioctl fd I2C S3C2410 GET SPEED printfCan readI2C speed closefd exit printfI2C Speed S3C2410Abuf 0x05buf 0x03buf 0x0Cbuf 0x02buf 0x04buf 0x01buf 0x00buf 0x0A显示 S3C2410A zlg7290 disp buf zlg7290getkey key 读取按键键值printf Read key value fail zlg7290snd...
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cmd#defineN76E003_IOC_MAGIC 'k'#defineN76E003_IOC_HEARTBEAT _IO(N76E003_IOC_MAGIC, 1)#defineN76E003_IOC_SET_UPTIME _IOW(N76E003_IOC_MAGIC, 2, int)intmain(intargc,charconst*argv[]){intret,fd,num,arg;fd=open(DEV_NAME,O_RDWR);if(fd<0){printf("Open device fail!\n");return-1;...
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