tool/mbed/mbed-sdk/libraries/tests/mbed/spi_ADXL345/main.cpp

   1 #include "test_env.h"
   2 #include "ADXL345.h"
   3
   4 #if defined(TARGET_LPC812)
   5 ADXL345 accelerometer(D10, D11, D12, D13);
   6
   7 #else
   8 ADXL345 accelerometer(p5, p6, p7, p8);
   9 #endif
  10
  11 // Assume test configuration on a plane (small x and y, z ~ g)
  12 #define MAX_X_Y     (50)
  13 #define MIN_Z       (200)
  14 #define MAX_Z       (300)
  15
  16 void check_X_Y(int v) {
  17     int16_t a = (int16_t)v;
  18     if (abs(a) > MAX_X_Y) {
  19         printf("X/Y acceleration is too big: %d\n", a);
  20         notify_completion(false);
  21     }
  22 }
  23
  24
  25 int main() {
  26     int readings[3] = {0, 0, 0};
  27
  28     printf("Starting ADXL345 test...\n");
  29     printf("Device ID is: 0x%02x\n", accelerometer.getDevId());
  30
  31     //Go into standby mode to configure the device.
  32     accelerometer.setPowerControl(0x00);
  33
  34     //Full resolution, +/-16g, 4mg/LSB.
  35     accelerometer.setDataFormatControl(0x0B);
  36
  37     //3.2kHz data rate.
  38     accelerometer.setDataRate(ADXL345_3200HZ);
  39
  40     //Measurement mode.
  41     accelerometer.setPowerControl(0x08);
  42
  43     for (int i=0; i<3; i++) {
  44         wait(0.1);
  45
  46         //13-bit, sign extended values.
  47         accelerometer.getOutput(readings);
  48
  49         // X and Y
  50         check_X_Y(readings[0]);
  51         check_X_Y(readings[1]);
  52
  53         // Z
  54         int16_t z = (int16_t)readings[2];
  55         if ((z < MIN_Z) || (z > MAX_Z)) {
  56             printf("Z acceleration not within expected range\n", z);
  57             notify_completion(false);
  58         }
  59     }
  60
  61     notify_completion(true);
  62 }