SHT30 Linux标准 i2c-dev 读取程序-白红宇

SHT30 Linux标准 i2c-dev 读取程序

阅读量：4674 次

发布时间：2019-06-09

本文共 1375 字，大约阅读时间需要 4 分钟。

#include 
    
         #include 
     
          #include 
      
           #include 
       
            #include 
        
             #include 
         
           #include 
          
            #include 
           
             #include 
            
              #include 
             
               #include 
              
                #define I2C_DEV "/dev/i2c-2" int main(void){ int tmp75Fd; int ret; unsigned char slaveAddr = 0x45; unsigned char buf[8] = {0}; // 打开设备 tmp75Fd = open(I2C_DEV, O_RDWR); if ( tmp75Fd < 0 ){ printf("faile to open the i2c bus: %s.\n", I2C_DEV); return -1; } // 设置7位地址 if ( ioctl(tmp75Fd, I2C_TENBIT, 0) < 0) { printf("faile to set bits.\n"); return -1; } // 强制设置地址 //if ( ioctl(tmp75Fd, I2C_SLAVE, 0x4c) < 0 ) { if ( ioctl(tmp75Fd, I2C_SLAVE_FORCE, slaveAddr) < 0 ) { perror("faile to set address.\n"); return -1; } while ( 1 ) { // 配置tmp75控制器 buf[0] = 0x2C; buf[1] = 0x0D; if ( write(tmp75Fd, buf, 2) != 2 ) { perror("faile to write config.\n"); return -1; } //buf[0] = 0xE0; //buf[1] = 0x00; //if ( write(tmp75Fd, buf, 2) != 2 ) { // perror("faile to write config.\n"); // return -1; //} buf[0] = 0; buf[1] = 0; if ( read(tmp75Fd, buf, 8) != 8 ) { perror("faile to read back configure data.\n"); return -1; } printf("tmp75 configure: 0x%x.0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x \n", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7] ); usleep(500000); } // 貌似是多余的 close(tmp75Fd); return 0; }