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...
ioctl(file,I2C_RDWR,(structi2c_rdwr_ioctl_data *)msgset); 这一行代码可以使用I2C协议和设备进行通信。它进行连续的读写,中间没有间歇。只有当适配器支持I2C_FUNC_I2C此命令才有效。参数是一个指针,指向一个结构体,它的定义如<!--[if supportFields]>REF _Ref283305956 /h <![endif]-->程序清单 3.3<!
#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/i2c-dev.h> int main() { int file; char *bus = "/dev/i2c-1"; // I2C 总线设备文件 if ((file = open(bus, O_RDWR)) < 0) { printf("Failed to open the bus.\n"); exit(...
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...
voidi2c1_8bit_send(unsignedchari2c_addr,unsignedlongreg_addr,unsignedcharsend_data){constchari2c_path[50]="/dev/i2c-1";inti2cFd;i2cFd=open(i2c_path,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 sla...
...两种方式 一般的I2C方式:ioctl(file, I2C_RDWR, &rdwr) SMBus方式:ioctl(file, I2C_SMBUS, &args) 5. 1.7K42 Linux应用开发【第十二章】I2C编程应用开发 简述I2C的linux驱动 1) I2C核心层: 2) I2C总线驱动层: 3) I2C总线驱动层: 12.3 在linux应用层使用I2C 12.3.1 如何使用I2C tools测试I2C外设 ...
Soft-I2C [√] [√] Pin [√] [√] PWM [√] [√] Serial [√] [√] SPI [√] [√] Timer [√] [√] msh [√] [√] LCD [√] Senser [√] 开始使用 验证Python环境 验证系统是否安装Python环境。在命令行中运行 python --version 检查Python版本(MR 脚本工具依赖Python ,若无Python环境...
(int argc, const char *argv[]) { int fd; int value; fd = open("/dev/hello_mise", O_RDWR); if (fd < 0) { printf("open is error\n"); return -1; } while(1) { ioctl(fd, CMD_TEST4, &value); //触发驱动中ioctl函数 printf("value is %d\n", value); sleep(2); } ...
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Soft-I2C [√] [√] Pin [√] [√] PWM [√] [√] Serial [√] [√] SPI [√] [√] Timer [√] [√] msh [√] [√] LCD [√] Senser [√] 开始使用 验证Python环境 验证系统是否安装Python环境。在命令行中运行 python --version 检查Python版本(MR 脚本工具依赖Python ,若无Python环境...