File content as of revision 1:851bc9589d81:

#include "mbed.h"

LocalFileSystem local("local");  // マウントポイントを定義（ディレクトリパスになる）
Serial pc(USBTX, USBRX);
I2C i2c(p9, p10);   //sda,scl

//LPS33HW slave address
#define S_add 0xB8

//Check adress
#define WHO_AM_I 0x0F

//CTRL_REG1
#define CTRL_REG1 0x10

//Start Up normal
#define Normal 0x10

//data register
#define press_msb 0x2A
#define press_lsb 0x29
#define press_xlsb 0x28

//define function
char cmd[2];
 
void i2c_write(int addr,char regist,char data)
{
    cmd[0]=regist;
    cmd[1]=data;
    i2c.write(addr,cmd,2);
}
 
char i2c_read(int addr,char regist)
{
    cmd[0]=regist;
    i2c.write(addr,cmd,1);
    i2c.read(addr,cmd,1);
    return cmd[0];
}

//main program
int main(){
    unsigned long  ID, M, L, XL;
    double press;
    double P;
    
    //Communication Check
    ID = i2c_read(S_add, WHO_AM_I);
    pc.printf("ID = 0x%x\r\n", ID);
    
    //Start Up
    i2c_write(S_add, CTRL_REG1, Normal);
    
    int i = 0;  //回数変数
    double data[100];    //データ格納
    
    while(i < 100)
    {
    //data read
        M = i2c_read(S_add, press_msb);
        
        L = i2c_read(S_add, press_lsb);
        
        XL = i2c_read(S_add, press_xlsb);
        
        press = (M << 16) | (L << 8) | XL;
        wait(0.1);
        
        P = press/4096;
        pc.printf("P = %lf [hPa] \r\n", P);
        data[i] = P;
        
        i++;
    }
    
    //データ保存
    pc.printf("Save start!\r\n");
    
    FILE *fp;
    
    fp = fopen("/local/pressure.csv", "w");  // ファイルを書き込みモードで開く
    
    for(i = 0; i < 100; i++){
        fprintf(fp, "%lf\n", data[i]);
        wait(0.1);
    }
    
    fclose(fp);
    
    pc.printf("finish!");
    
}