struct i2c_rdwr_ioctl_data work_queue; unsigned int slave_address,reg_address,dat; int i,ret; unsigned char val; unsigned int fd; if(argc != 3) { printf("usage:./eeprom_ioctl address data\n"); return 0; } fd=open("/dev/i2c/0",O_RDWR); if(!fd) { printf("error on opening ...
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...
int fd; if ((fd = open("/dev/i2c-1",O_RDWR))< 0) { /* 错误处理 */ exit(1); } 打开适配器对应的设备节点,i2c-dev为打开的线程建立一个i2c_client,但是这个i2c_client并不加到i2c_adapter的client链表当中。当用户关闭设备节点时,它自动被释放。 1.2 IOCTL控制 查看include/linux/i2c-dev.h文...
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...
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...
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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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我有一些 C 代码尝试使用 ioctl 操作对其执行写入操作I2C_RDWR。这是我正在使用的精简代码(仅提供上下文,运行它对于回答问题并不重要)。fd = open ("/dev/i2c-0", O_RDWR | O_NONBLOCK); /* other stuff happens here */ if (ioctl (fd, I2C_FUNCS, &funcs) != 0) return -1; if (!(funcs &...