Mark Petovello / Mbed 2 deprecated tilt_angles

Framework of classes and program to measure tilt angles using accelerometers

Dependencies:   C12832 mbed

Fork of tilt_angles by Mark Petovello

ENGO333_MMA7660.cpp@1:64f1aefe1842, 2016-11-25 (annotated)

Committer:
mpetovello
Date:
Fri Nov 25 15:18:28 2016 +0000
Revision:
1:64f1aefe1842
Parent:
0:3bffc1862262 
Removed MMA7660 library (unnecessary)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mpetovello 0:3bffc1862262 1 #include "ENGO333_MMA7660.h"
mpetovello 0:3bffc1862262 2
mpetovello 0:3bffc1862262 3 const float GRAVITY = 9.8086;
mpetovello 0:3bffc1862262 4
mpetovello 0:3bffc1862262 5 ENGO333_MMA7660::ENGO333_MMA7660() : i2c(p28, p27)
mpetovello 0:3bffc1862262 6 {
mpetovello 0:3bffc1862262 7 SetActiveMode();
mpetovello 0:3bffc1862262 8 SetSamplingRateAM(MMA7660_AMSR8);
mpetovello 0:3bffc1862262 9 measAccel[0] = measAccel[1] = measAccel[2] = 0;
mpetovello 0:3bffc1862262 10 }
mpetovello 0:3bffc1862262 11
mpetovello 0:3bffc1862262 12 bool ENGO333_MMA7660::TestConnection()
mpetovello 0:3bffc1862262 13 {
mpetovello 0:3bffc1862262 14 char data[3] = {128, 128, 128};
mpetovello 0:3bffc1862262 15 bool alert;
mpetovello 0:3bffc1862262 16
mpetovello 0:3bffc1862262 17 // Check data validity
mpetovello 0:3bffc1862262 18 alert = false;
mpetovello 0:3bffc1862262 19 i2c.readBytes(MMA7660_ADDRESS, MMA7660_XOUT_REG, data, 3);
mpetovello 0:3bffc1862262 20 for (int i = 0; i < 3; ++i) {
mpetovello 0:3bffc1862262 21 if (data[i] > 63)
mpetovello 0:3bffc1862262 22 alert = true;
mpetovello 0:3bffc1862262 23 }
mpetovello 0:3bffc1862262 24
mpetovello 0:3bffc1862262 25 if (alert == false) {
mpetovello 0:3bffc1862262 26 return true;
mpetovello 0:3bffc1862262 27 } else {
mpetovello 0:3bffc1862262 28 return false;
mpetovello 0:3bffc1862262 29 }
mpetovello 0:3bffc1862262 30 }
mpetovello 0:3bffc1862262 31
mpetovello 0:3bffc1862262 32 void ENGO333_MMA7660::SetActiveMode()
mpetovello 0:3bffc1862262 33 {
mpetovello 0:3bffc1862262 34 i2c.writeOneByte(MMA7660_ADDRESS, MMA7660_MODE_REG, 0x01);
mpetovello 0:3bffc1862262 35 }
mpetovello 0:3bffc1862262 36
mpetovello 0:3bffc1862262 37 void ENGO333_MMA7660::SetSamplingRateAM(MMA7660_AMSR_t samplingRate)
mpetovello 0:3bffc1862262 38 {
mpetovello 0:3bffc1862262 39 char oldValue, newValue;
mpetovello 0:3bffc1862262 40 oldValue = i2c.readOneByte(MMA7660_ADDRESS, MMA7660_SR_REG);
mpetovello 0:3bffc1862262 41 oldValue = oldValue & 0x07;
mpetovello 0:3bffc1862262 42 newValue = oldValue | samplingRate;
mpetovello 0:3bffc1862262 43 i2c.writeOneByte(MMA7660_ADDRESS, MMA7660_SR_REG, newValue);
mpetovello 0:3bffc1862262 44 }
mpetovello 0:3bffc1862262 45
mpetovello 0:3bffc1862262 46 void ENGO333_MMA7660::ReadAccelerometers()
mpetovello 0:3bffc1862262 47 {
mpetovello 0:3bffc1862262 48 char data[3];
mpetovello 0:3bffc1862262 49 bool alert;
mpetovello 0:3bffc1862262 50
mpetovello 0:3bffc1862262 51 // Check data validity
mpetovello 0:3bffc1862262 52 do {
mpetovello 0:3bffc1862262 53 alert = false;
mpetovello 0:3bffc1862262 54 i2c.readBytes(MMA7660_ADDRESS, MMA7660_XOUT_REG, data, 3);
mpetovello 0:3bffc1862262 55 for (int i = 0; i < 3; ++i) {
mpetovello 0:3bffc1862262 56 if (data[i] > 63)
mpetovello 0:3bffc1862262 57 alert = true;
mpetovello 0:3bffc1862262 58 if (data[i] > 31)
mpetovello 0:3bffc1862262 59 data[i] += 128 + 64;
mpetovello 0:3bffc1862262 60 }
mpetovello 0:3bffc1862262 61 } while (alert);
mpetovello 0:3bffc1862262 62
mpetovello 0:3bffc1862262 63 measAccel[0] = (signed char)(data[0]) / MMA7660_SCALE * GRAVITY;
mpetovello 0:3bffc1862262 64 measAccel[1] = (signed char)(data[1]) / MMA7660_SCALE * GRAVITY;
mpetovello 0:3bffc1862262 65 measAccel[2] = (signed char)(data[2]) / MMA7660_SCALE * GRAVITY;
mpetovello 0:3bffc1862262 66 }
mpetovello 0:3bffc1862262 67
mpetovello 0:3bffc1862262 68 float ENGO333_MMA7660::GetAccelX() const
mpetovello 0:3bffc1862262 69 {
mpetovello 0:3bffc1862262 70 return measAccel[0];
mpetovello 0:3bffc1862262 71 }
mpetovello 0:3bffc1862262 72
mpetovello 0:3bffc1862262 73 float ENGO333_MMA7660::GetAccelY() const
mpetovello 0:3bffc1862262 74 {
mpetovello 0:3bffc1862262 75 return measAccel[1];
mpetovello 0:3bffc1862262 76 }
mpetovello 0:3bffc1862262 77
mpetovello 0:3bffc1862262 78 float ENGO333_MMA7660::GetAccelZ() const
mpetovello 0:3bffc1862262 79 {
mpetovello 0:3bffc1862262 80 return measAccel[2];
mpetovello 0:3bffc1862262 81 }
mpetovello 0:3bffc1862262 82