fl@c@ Johnson / Mbed 2 deprecated ramanSpectrometer_imagingBoard Featured

This is the device firmware for the imagingBoard on the DIY 3D Printable Raspberry Pi Raman Spectrometer. For more details please visit: http://hackaday.io/project/1279

Dependencies:   mbed

main.cpp@1:a220fd937508, 2014-08-17 (annotated)

Committer:
flatcat
Date:
Sun Aug 17 16:33:40 2014 +0000
Revision:
1:a220fd937508
Parent:
0:984447b91a04
Child:
2:7751080fb267
Total re-write....  Changed to triggered ICG ; Works much better..!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
flatcat 0:984447b91a04 1 #include "mbed.h"
flatcat 0:984447b91a04 2
flatcat 0:984447b91a04 3 // *** BE SURE TO TEST BEFORE AND AFTER FOR 'IDLING'... CLEAR THE CCD EVERY OTHER FRAME TO TRY AND ELIMINATE NOISE BUILDUP
flatcat 0:984447b91a04 4 //From http://www.ing.iac.es/~docs/ins/das/ins-das-29/integration.html
flatcat 0:984447b91a04 5 //"Idling" vs. integrating
flatcat 0:984447b91a04 6 //Charge from light leaks and thermal noise builds up on the detector between observations. If this charge is integrated by the detector, it may not be completely
flatcat 0:984447b91a04 7 //cleared away by the clear cycle of the next observation. In that case, the observation will be contaminated by extra counts. (Often, this appears as a ramp in the
flatcat 0:984447b91a04 8 //background leading up to a saturated region in the low-numbered rows.)
flatcat 0:984447b91a04 9 //To avoid this problem, the detector is made to clear itself continuously between observations. This is called "idling", and is reported as such on the mimic.
flatcat 0:984447b91a04 10
flatcat 1:a220fd937508 11 PwmOut masterClock(PB_4);
flatcat 0:984447b91a04 12 PwmOut shiftGate(PB_8);
flatcat 1:a220fd937508 13 InterruptIn shiftGate_int(PC_6);
flatcat 1:a220fd937508 14 //PwmOut icg(PB_3);
flatcat 1:a220fd937508 15 DigitalOut ICG(PB_3);
flatcat 1:a220fd937508 16 //interruptIn icg_int(PB_3);
flatcat 0:984447b91a04 17 AnalogIn imageIn(A0);
flatcat 1:a220fd937508 18 //AnalogOut imageOut(A5);
flatcat 1:a220fd937508 19 DigitalOut LED(LED1);
flatcat 0:984447b91a04 20 Serial raspi(USBTX, USBRX);
flatcat 0:984447b91a04 21
flatcat 1:a220fd937508 22 int masterFreq_period = 2; //microseconds
flatcat 1:a220fd937508 23 int masterFreq_width = 1; //microseconds
flatcat 1:a220fd937508 24 int shiftGate_period = 200; //microseconds
flatcat 1:a220fd937508 25 int shiftGate_width = 100; //microseconds
flatcat 1:a220fd937508 26
flatcat 1:a220fd937508 27 int veryLow = 1;
flatcat 1:a220fd937508 28 int low = 100;
flatcat 1:a220fd937508 29 int medium = 100000;
flatcat 1:a220fd937508 30 int high = 1000000;
flatcat 1:a220fd937508 31 int veryHigh = 10000000;
flatcat 1:a220fd937508 32
flatcat 1:a220fd937508 33 int sensitivity = medium;
flatcat 1:a220fd937508 34 int pixelTotal = 3694;
flatcat 1:a220fd937508 35 int leadingDummyElements = 16;
flatcat 1:a220fd937508 36 int leadShieldedElements = 13;
flatcat 1:a220fd937508 37 int headerElements = 3;
flatcat 1:a220fd937508 38 const int signalElements = 3648;
flatcat 1:a220fd937508 39 int trailingDummyElements = 14;
flatcat 1:a220fd937508 40 int pixelCount;
flatcat 1:a220fd937508 41 int readOutTrigger;
flatcat 1:a220fd937508 42 int state;
flatcat 1:a220fd937508 43
flatcat 1:a220fd937508 44 #define readOut_Begin 1
flatcat 1:a220fd937508 45 #define readOut_ACTIVE 2
flatcat 1:a220fd937508 46 #define readOut_LeadingDummy 3
flatcat 1:a220fd937508 47 #define readOut_LeadingShielded 4
flatcat 1:a220fd937508 48 #define readOut_headerElements 5
flatcat 1:a220fd937508 49 #define readOut_signalElements 6
flatcat 1:a220fd937508 50 #define readOut_trailingDummy 7
flatcat 1:a220fd937508 51 #define readOut_integrationTime 8
flatcat 1:a220fd937508 52 #define readOut_IDLE 9
flatcat 1:a220fd937508 53 #define readOut_Finish 0
flatcat 0:984447b91a04 54
flatcat 0:984447b91a04 55 #define MV(x) ((0xFFF*x)/3300)
flatcat 0:984447b91a04 56
flatcat 1:a220fd937508 57 float pixelValue[signalElements];
flatcat 1:a220fd937508 58
flatcat 1:a220fd937508 59 void error()
flatcat 1:a220fd937508 60 {
flatcat 1:a220fd937508 61 while(1) {
flatcat 1:a220fd937508 62 LED = !LED;
flatcat 1:a220fd937508 63 wait(0.5);
flatcat 1:a220fd937508 64 }
flatcat 1:a220fd937508 65 }
flatcat 1:a220fd937508 66
flatcat 1:a220fd937508 67 void checkState()
flatcat 1:a220fd937508 68 {
flatcat 1:a220fd937508 69 if (readOutTrigger == 1) {
flatcat 1:a220fd937508 70 // state = readOut_LeadingDummy;
flatcat 1:a220fd937508 71 }
flatcat 1:a220fd937508 72 switch (state) {
flatcat 1:a220fd937508 73 case readOut_Begin:
flatcat 1:a220fd937508 74 readOutTrigger = 1;
flatcat 1:a220fd937508 75 state = readOut_ACTIVE;
flatcat 1:a220fd937508 76 // ICG = 1;
flatcat 1:a220fd937508 77 LED = 1;
flatcat 1:a220fd937508 78 break;
flatcat 1:a220fd937508 79 case readOut_ACTIVE:
flatcat 1:a220fd937508 80 ICG = 1;
flatcat 1:a220fd937508 81 state = readOut_LeadingDummy;
flatcat 1:a220fd937508 82 break;
flatcat 1:a220fd937508 83 case readOut_LeadingDummy:
flatcat 1:a220fd937508 84 pixelCount++;
flatcat 1:a220fd937508 85 if (pixelCount == leadingDummyElements) {
flatcat 1:a220fd937508 86 pixelCount = 0;
flatcat 1:a220fd937508 87 state = readOut_LeadingShielded;
flatcat 1:a220fd937508 88 }
flatcat 1:a220fd937508 89 break;
flatcat 1:a220fd937508 90 case readOut_LeadingShielded:
flatcat 1:a220fd937508 91 pixelCount++;
flatcat 1:a220fd937508 92 if (pixelCount == leadShieldedElements) {
flatcat 1:a220fd937508 93 pixelCount = 0;
flatcat 1:a220fd937508 94 state = readOut_headerElements;
flatcat 1:a220fd937508 95 }
flatcat 1:a220fd937508 96 break;
flatcat 1:a220fd937508 97 case readOut_headerElements:
flatcat 1:a220fd937508 98 pixelCount++;
flatcat 1:a220fd937508 99 if (pixelCount == headerElements) {
flatcat 1:a220fd937508 100 pixelCount = 0;
flatcat 1:a220fd937508 101 state = readOut_signalElements;
flatcat 1:a220fd937508 102 }
flatcat 1:a220fd937508 103 break;
flatcat 1:a220fd937508 104 case readOut_signalElements:
flatcat 1:a220fd937508 105 pixelCount++;
flatcat 1:a220fd937508 106 // pixelValue[pixelCount] = imageIn.read();
flatcat 1:a220fd937508 107 LED = !LED;
flatcat 1:a220fd937508 108 if (pixelCount == signalElements) {
flatcat 1:a220fd937508 109 pixelCount = 0;
flatcat 1:a220fd937508 110 state = readOut_trailingDummy;
flatcat 1:a220fd937508 111 }
flatcat 1:a220fd937508 112 break;
flatcat 1:a220fd937508 113 case readOut_trailingDummy:
flatcat 1:a220fd937508 114 pixelCount++;
flatcat 1:a220fd937508 115 if (pixelCount == trailingDummyElements) {
flatcat 1:a220fd937508 116 pixelCount = 0;
flatcat 1:a220fd937508 117 state = readOut_integrationTime;
flatcat 1:a220fd937508 118 }
flatcat 1:a220fd937508 119 break;
flatcat 1:a220fd937508 120 case readOut_integrationTime:
flatcat 1:a220fd937508 121 if (ICG == 1) {
flatcat 1:a220fd937508 122 ICG = 0;
flatcat 1:a220fd937508 123 wait_us(sensitivity);
flatcat 1:a220fd937508 124 state = readOut_Finish;
flatcat 1:a220fd937508 125 }
flatcat 1:a220fd937508 126 break;
flatcat 1:a220fd937508 127 case readOut_Finish:
flatcat 1:a220fd937508 128 state = readOut_IDLE;
flatcat 1:a220fd937508 129 LED = 0;
flatcat 1:a220fd937508 130 ICG = 1;
flatcat 1:a220fd937508 131 break;
flatcat 1:a220fd937508 132 case readOut_IDLE:
flatcat 1:a220fd937508 133 if (ICG == 1) {
flatcat 1:a220fd937508 134 ICG = 0;
flatcat 1:a220fd937508 135 state = readOut_Begin;
flatcat 1:a220fd937508 136 }
flatcat 1:a220fd937508 137 break;
flatcat 1:a220fd937508 138 default:
flatcat 1:a220fd937508 139 break;
flatcat 1:a220fd937508 140 }
flatcat 1:a220fd937508 141 }
flatcat 1:a220fd937508 142
flatcat 0:984447b91a04 143 int main()
flatcat 0:984447b91a04 144 {
flatcat 1:a220fd937508 145 ICG = 1;
flatcat 1:a220fd937508 146 LED = 0;
flatcat 1:a220fd937508 147 pixelCount = 0;
flatcat 1:a220fd937508 148 readOutTrigger = 0;
flatcat 1:a220fd937508 149 state = readOut_IDLE;
flatcat 1:a220fd937508 150
flatcat 0:984447b91a04 151 masterClock.period_us(masterFreq_period);
flatcat 0:984447b91a04 152 masterClock.pulsewidth_us(masterFreq_width);
flatcat 0:984447b91a04 153
flatcat 0:984447b91a04 154 shiftGate.period_us(shiftGate_period);
flatcat 0:984447b91a04 155 shiftGate.pulsewidth_us(shiftGate_width);
flatcat 0:984447b91a04 156
flatcat 1:a220fd937508 157 wait(0.5);
flatcat 1:a220fd937508 158
flatcat 1:a220fd937508 159 shiftGate_int.rise(checkState);
flatcat 1:a220fd937508 160
flatcat 0:984447b91a04 161 raspi.baud(921600);
flatcat 0:984447b91a04 162 while(1) {
flatcat 1:a220fd937508 163 wait(1);
flatcat 0:984447b91a04 164 }
flatcat 0:984447b91a04 165 }