ms5611.c

#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc,char** argv) {

    int file;
    char filename[40];
    uint8_t buf[10];
    uint16_t* p16;
    uint32_t* p32;
    p16=&buf[0];
    p32=&buf[0];


    int addr = 0x77;       

    sprintf(filename,"/dev/i2c-2");
    if ((file = open(filename,O_RDWR)) < 0) {
        printf("Failed to open the bus.");
        exit(1);
    }

    if (ioctl(file,I2C_SLAVE,addr) < 0) {
        printf("Failed to acquire bus access and/or talk to slave.\n");
        exit(1);
    }

    //RESET
    buf[0]=0x1e;
    write(file,buf,1);
    usleep(2000);


    //PROM
    for(int i=0xa0;i<=0xae;i+=2){
      buf[0]=i;
      write(file,buf,1);
      read(file,buf,2);
      printf("reg=%02x value=%04x (%d)\r\n",i,p16[0],p16[0]);
    }

    //D1
    buf[0]=0x40;
    write(file,buf,1);
    usleep(1000);
    buf[0]=0x0;
    write(file,buf,1);
    read(file,buf,3);
    printf("0x40=%02x%02x%02x (%d)\r\n",buf[0],buf[1],buf[2],p32[0]);

    //D2
    buf[0]=0x50;
    write(file,buf,1);
    usleep(1000);
    buf[0]=0x0;
    write(file,buf,1);
    read(file,buf,3);
    printf("0x50=%02x%02x%02x (%d)\r\n",buf[0],buf[1],buf[2],p32[0]);

 
}