Chase Lake / Mbed 2 deprecated TargetPracticeMiniProject

Using an accelerometer to move a ball on an LED screen.

Dependencies:   UniGraphic mbed

ADXL.cpp@2:c6bf8599c398, 2016-01-20 (annotated)

Committer:
bentogami
Date:
Wed Jan 20 22:00:15 2016 +0000
Revision:
2:c6bf8599c398
Parent:
1:c436c1b8333b 
Mission complete (for real)!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bentogami 0:708949ec9140 1 #include "ADXL.h"
bentogami 0:708949ec9140 2
bentogami 0:708949ec9140 3 SPI acc(p11, p12, p13);
bentogami 0:708949ec9140 4 DigitalOut cs(p10);
bentogami 0:708949ec9140 5 char buffer[6];
bentogami 1:c436c1b8333b 6 int16_t tempData[3];
bentogami 0:708949ec9140 7 float x, y, z;
bentogami 0:708949ec9140 8
bentogami 0:708949ec9140 9 void accConfig() {
bentogami 0:708949ec9140 10 cs=1; // initially ADXL345 is not activated
bentogami 0:708949ec9140 11 acc.format(8,3); // 8 bit data, Mode 3
bentogami 0:708949ec9140 12 acc.frequency(2000000); // 2MHz clock rate
bentogami 0:708949ec9140 13 cs=0; //select the device
bentogami 0:708949ec9140 14 acc.write(0x31); // data format register
bentogami 0:708949ec9140 15 acc.write(0x0B); // format +/-16g, 0.004g/LSB
bentogami 0:708949ec9140 16 cs=1; //end of transmission
bentogami 0:708949ec9140 17 cs=0; //start a new transmission
bentogami 0:708949ec9140 18 acc.write(0x2D); // power ctrl register
bentogami 0:708949ec9140 19 acc.write(0x08); // measure mode
bentogami 0:708949ec9140 20 cs=1; // end of transmission
bentogami 0:708949ec9140 21 }
bentogami 0:708949ec9140 22
bentogami 0:708949ec9140 23 void getAccel(float* data) {
bentogami 0:708949ec9140 24 wait(0.2);
bentogami 0:708949ec9140 25 cs=0; //start a transmission
bentogami 0:708949ec9140 26 acc.write(0x80|0x40|0x32); // RW bit high, MB bit high, plus address
bentogami 0:708949ec9140 27 for (int i = 0;i<=5;i++) {
bentogami 0:708949ec9140 28 buffer[i]=acc.write(0x00); // read back 6 data bytes
bentogami 0:708949ec9140 29 }
bentogami 0:708949ec9140 30 cs=1; //end of transmission
bentogami 0:708949ec9140 31 tempData[0] = buffer[1] << 8 | buffer[0]; //combine MSB and LSB
bentogami 0:708949ec9140 32 tempData[1] = buffer[3] << 8 | buffer[2];
bentogami 0:708949ec9140 33 tempData[2] = buffer[5] << 8 | buffer[4];
bentogami 0:708949ec9140 34 x = tempData[0]*0.004;
bentogami 0:708949ec9140 35 y = tempData[1]*0.004;
bentogami 0:708949ec9140 36 z = tempData[2]*0.004;
bentogami 0:708949ec9140 37 data[0] = x;
bentogami 0:708949ec9140 38 data[1] = y;
bentogami 0:708949ec9140 39 data[2] = z;
bentogami 1:c436c1b8333b 40
bentogami 0:708949ec9140 41 }