File content as of revision 2:7abdbccdf0c8:

#define __STDC_LIMIT_MACROS 1
#include <stdint.h>

#include "ADXL345_I2C.h"
#include "SSD1308.h"

//#define DEBUG

#ifdef DEBUG
#include "USBSerial.h"                       // To use USB virtual serial, a driver is needed, check http://mbed.org/handbook/USBSerial
#define LOG(args...)    pc.printf(args)
USBSerial pc;
#else
#define LOG(args...)
#endif

#define MAX_ACC_AXIS 3
ADXL345_I2C accelerometer(P0_5, P0_4);

// Xhadow - OLED 128x64 is connected with I2C
I2C i2c(P0_5, P0_4);    // SDA, SCL
SSD1308 oled = SSD1308(i2c, SSD1308_SA0);

AnalogIn AD00(P0_11);
AnalogIn AD01(P0_12);
AnalogIn ChargerStatus(P0_13);      // ADC input from VCC through a 200K/200K divider with extara 100K pull down on !DONE and 49.9K on !CHRG 

DigitalOut blue_led(P0_20, 0);
DigitalOut white_led(P0_23, 1);
DigitalOut Bus3V3En(P0_14, 1);      // Pin that controls the BUS-3V3 (3.3V) regulator output to the Xadow Bus

InterruptIn test_int(P0_7);

void test_pin_int(void)
{
    white_led = !white_led;
    Bus3V3En = !Bus3V3En;
}

int main()
{
    int readings[MAX_ACC_AXIS] = {0, 0, 0};
    int MAXreadings[MAX_ACC_AXIS] = {INT16_MIN, INT16_MIN, INT16_MIN};
    int MINreadings[MAX_ACC_AXIS] = {INT16_MAX, INT16_MAX, INT16_MAX};

    char display_buf[17];
    
    test_int.rise(test_pin_int);

    LOG("Starting ADXL345 test...\n");
    LOG("Device ID is: 0x%02x\n", accelerometer.getDeviceID());

    oled.writeString(0, 0, "Accelerometer:");
    oled.writeString(1, 0, "  Curr  Min  Max");
 
    //Go into standby mode to configure the device.
    accelerometer.setPowerControl(0x00);
 
    //Full resolution, +/-16g, 4mg/LSB.
    accelerometer.setDataFormatControl(0x0B);
     
    //3.2kHz data rate.
    accelerometer.setDataRate(ADXL345_3200HZ);
 
    //Measurement mode.
    accelerometer.setPowerControl(0x08);

    while (1) {
        accelerometer.getOutput(readings);
        
        for (int i=0; i<MAX_ACC_AXIS; ++i) {
            if ((int16_t)readings[i] > (int16_t)MAXreadings[i]) {
                MAXreadings[i] = readings[i];    
            }
            if ((int16_t)readings[i] < (int16_t)MINreadings[i]) {
                MINreadings[i] = readings[i];    
            }
            
            snprintf(display_buf, sizeof(display_buf), "%c%5i%5i%5i",
                     'X'+i, (int16_t)readings[i], (int16_t)MINreadings[i], (int16_t)MAXreadings[i] );
            oled.writeString(2+i, 0, display_buf);
            LOG("%c:%i|%i|%i\r\n", 'X'+i, (int16_t)readings[i], (int16_t)MINreadings[i], (int16_t)MAXreadings[i] );
        }
        
/*        snprintf(display_buf, sizeof(display_buf), "Ch: %u", ChargerStatus.read_u16());
        oled.writeString(2+MAX_ACC_AXIS, 0, display_buf);

        snprintf(display_buf, sizeof(display_buf), "Ch: %f", 3.3*(float)ChargerStatus.read_u16()/UINT16_MAX);
        oled.writeString(2+MAX_ACC_AXIS+1, 0, display_buf);
*/        
        snprintf(display_buf, sizeof(display_buf), "Bat:%.2fV", 3.3*ChargerStatus);
        oled.writeString(2+MAX_ACC_AXIS+2, 0, display_buf);
        
        LOG("Ch: %f\r\n", ChargerStatus.read());
        LOG("Chu: %u\r\n", ChargerStatus.read_u16());
        LOG("A0: %f\r\n", (float)AD00.read());
        LOG("A1: %f\r\n", AD01.read());
        
        blue_led = !blue_led;
 //       white_led = !white_led;   // toggled by pin P0_7 interrupt
 
//        deepsleep();  // Deep sleep until external interrupt  // The wakeup pin on Xadow is on the sme buton at RESET - no good.
        
        wait(1);
    }

}