File content as of revision 3:824764571657:

/* Program 7.4: Read ADXL345 accelerometer through SPI.
Outputs continuously to terminal
*/

#include "mbed.h"

SPI acc(p11,p12,p13);           //Set up SPI MOSI, MISO, SCL
DigitalOut cs(p14);             //set up chip select
Serial pc(USBTX, USBRX);
char buffer[6];                 //raw filler data
int16_t data[3];                //16bit twos-compliment integer data
float x,y,z;                    //set up floats for values to display

int main(){
    cs=1;                       //initially off
    acc.format(8,3);            //8bit, mode 3
    acc.frequency(2000000);     //2MHz
    cs=0;                       //select
    acc.write(0x31);            //data format register
    acc.write(0x0B);            //+/-16g, 0.004g sensitivity
    cs=1;                       //end transmission
    cs=0;                       //start new transmission
    acc.write(0x2D);            //power mode = measure
    acc.write(0x08);
    cs=1;
    
    
    while(1){
        wait(0.2);
        cs=0;
        acc.write(0x80|0x40|0x32);      //RW bit high, MB bit high, address
        for (int i=0;i<=5;i++){buffer[i]=acc.write(0x00);}           //read 6bytes
        cs=1;
        data[0]=buffer[1]<<8|buffer[0];             
        data[1]=buffer[3]<<8|buffer[2];         //combine MSB and LSB
        data[2]=buffer[5]<<8|buffer[4];
        x=0.004*data[0];    y=0.004*data[1];    z=0.004*data[2];        //convert to float, actual g value
        pc.printf("x = %+1.2fg\t y = %+1.2fg\t z = %+1.2fg\n\r", x,y,z);
    }
}