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@6:fe473ca8b625, 2014-08-19 (annotated)

Committer:
flatcat
Date:
Tue Aug 19 06:48:45 2014 +0000
Revision:
6:fe473ca8b625
Parent:
5:cbf08f942178
Child:
7:0f8b3da4fb24
Fixed timing..; Fixed Analog Sample Buffering..;

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 DigitalOut ICG(PB_3);
flatcat 0:984447b91a04 15 AnalogIn imageIn(A0);
flatcat 1:a220fd937508 16 DigitalOut LED(LED1);
flatcat 0:984447b91a04 17 Serial raspi(USBTX, USBRX);
flatcat 0:984447b91a04 18
flatcat 6:fe473ca8b625 19 int masterFreq_period = 20; //microseconds
flatcat 6:fe473ca8b625 20 int masterFreq_width = 10; //microseconds
flatcat 6:fe473ca8b625 21 int shiftGate_period = 60; //microseconds
flatcat 6:fe473ca8b625 22 int shiftGate_width = 30; //microseconds
flatcat 1:a220fd937508 23
flatcat 3:83cb6eb61adf 24 int none = 0;
flatcat 1:a220fd937508 25 int veryLow = 1;
flatcat 1:a220fd937508 26 int low = 100;
flatcat 1:a220fd937508 27 int medium = 100000;
flatcat 1:a220fd937508 28 int high = 1000000;
flatcat 1:a220fd937508 29 int veryHigh = 10000000;
flatcat 1:a220fd937508 30
flatcat 2:7751080fb267 31 double imageData;
flatcat 3:83cb6eb61adf 32 int sensitivity = none;
flatcat 1:a220fd937508 33 int pixelTotal = 3694;
flatcat 1:a220fd937508 34 int leadingDummyElements = 16;
flatcat 1:a220fd937508 35 int leadShieldedElements = 13;
flatcat 1:a220fd937508 36 int headerElements = 3;
flatcat 5:cbf08f942178 37 const int signalElements = 3648;
flatcat 1:a220fd937508 38 int trailingDummyElements = 14;
flatcat 1:a220fd937508 39 int pixelCount;
flatcat 1:a220fd937508 40 int readOutTrigger;
flatcat 1:a220fd937508 41 int state;
flatcat 1:a220fd937508 42
flatcat 1:a220fd937508 43 #define readOut_Begin 1
flatcat 1:a220fd937508 44 #define readOut_ACTIVE 2
flatcat 1:a220fd937508 45 #define readOut_LeadingDummy 3
flatcat 1:a220fd937508 46 #define readOut_LeadingShielded 4
flatcat 1:a220fd937508 47 #define readOut_headerElements 5
flatcat 1:a220fd937508 48 #define readOut_signalElements 6
flatcat 1:a220fd937508 49 #define readOut_trailingDummy 7
flatcat 1:a220fd937508 50 #define readOut_integrationTime 8
flatcat 1:a220fd937508 51 #define readOut_IDLE 9
flatcat 1:a220fd937508 52 #define readOut_Finish 0
flatcat 0:984447b91a04 53
flatcat 0:984447b91a04 54 #define MV(x) ((0xFFF*x)/3300)
flatcat 0:984447b91a04 55
flatcat 6:fe473ca8b625 56 double pixelValue[signalElements] = { 0 };
flatcat 1:a220fd937508 57
flatcat 1:a220fd937508 58 void error()
flatcat 1:a220fd937508 59 {
flatcat 1:a220fd937508 60 while(1) {
flatcat 1:a220fd937508 61 LED = !LED;
flatcat 1:a220fd937508 62 wait(0.5);
flatcat 1:a220fd937508 63 }
flatcat 1:a220fd937508 64 }
flatcat 1:a220fd937508 65
flatcat 1:a220fd937508 66 void checkState()
flatcat 1:a220fd937508 67 {
flatcat 1:a220fd937508 68 if (readOutTrigger == 1) {
flatcat 1:a220fd937508 69 // state = readOut_LeadingDummy;
flatcat 1:a220fd937508 70 }
flatcat 1:a220fd937508 71 switch (state) {
flatcat 1:a220fd937508 72 case readOut_Begin:
flatcat 1:a220fd937508 73 readOutTrigger = 1;
flatcat 1:a220fd937508 74 state = readOut_ACTIVE;
flatcat 6:fe473ca8b625 75 // raspi.printf("+++\r\n");
flatcat 1:a220fd937508 76 LED = 1;
flatcat 1:a220fd937508 77 break;
flatcat 1:a220fd937508 78 case readOut_ACTIVE:
flatcat 1:a220fd937508 79 ICG = 1;
flatcat 1:a220fd937508 80 state = readOut_LeadingDummy;
flatcat 1:a220fd937508 81 break;
flatcat 1:a220fd937508 82 case readOut_LeadingDummy:
flatcat 1:a220fd937508 83 pixelCount++;
flatcat 1:a220fd937508 84 if (pixelCount == leadingDummyElements) {
flatcat 1:a220fd937508 85 pixelCount = 0;
flatcat 1:a220fd937508 86 state = readOut_LeadingShielded;
flatcat 1:a220fd937508 87 }
flatcat 1:a220fd937508 88 break;
flatcat 1:a220fd937508 89 case readOut_LeadingShielded:
flatcat 1:a220fd937508 90 pixelCount++;
flatcat 1:a220fd937508 91 if (pixelCount == leadShieldedElements) {
flatcat 1:a220fd937508 92 pixelCount = 0;
flatcat 1:a220fd937508 93 state = readOut_headerElements;
flatcat 1:a220fd937508 94 }
flatcat 1:a220fd937508 95 break;
flatcat 1:a220fd937508 96 case readOut_headerElements:
flatcat 1:a220fd937508 97 pixelCount++;
flatcat 1:a220fd937508 98 if (pixelCount == headerElements) {
flatcat 1:a220fd937508 99 pixelCount = 0;
flatcat 1:a220fd937508 100 state = readOut_signalElements;
flatcat 1:a220fd937508 101 }
flatcat 1:a220fd937508 102 break;
flatcat 1:a220fd937508 103 case readOut_signalElements:
flatcat 1:a220fd937508 104 pixelCount++;
flatcat 6:fe473ca8b625 105 pixelValue[pixelCount] = imageIn.read_u16();
flatcat 6:fe473ca8b625 106 // raspi.printf("%i\t%4.12f\r\n", pixelCount,(imageIn.read_u16() * 5.0) / 4096.0);
flatcat 1:a220fd937508 107 if (pixelCount == signalElements) {
flatcat 1:a220fd937508 108 pixelCount = 0;
flatcat 1:a220fd937508 109 state = readOut_trailingDummy;
flatcat 1:a220fd937508 110 }
flatcat 1:a220fd937508 111 break;
flatcat 1:a220fd937508 112 case readOut_trailingDummy:
flatcat 1:a220fd937508 113 pixelCount++;
flatcat 1:a220fd937508 114 if (pixelCount == trailingDummyElements) {
flatcat 1:a220fd937508 115 pixelCount = 0;
flatcat 1:a220fd937508 116 state = readOut_integrationTime;
flatcat 2:7751080fb267 117 ICG = 0;
flatcat 1:a220fd937508 118 }
flatcat 1:a220fd937508 119 break;
flatcat 1:a220fd937508 120 case readOut_integrationTime:
flatcat 1:a220fd937508 121 wait_us(sensitivity);
flatcat 2:7751080fb267 122 state = readOut_Finish;
flatcat 6:fe473ca8b625 123 for (int pixelNumber=0; pixelNumber<signalElements; pixelNumber++) {
flatcat 6:fe473ca8b625 124 raspi.printf("%i\t%4.12f\r\n", pixelNumber, (pixelValue[pixelNumber] * 5) / 4096.0);
flatcat 6:fe473ca8b625 125 }
flatcat 6:fe473ca8b625 126 // raspi.printf("---\r\n");
flatcat 1:a220fd937508 127 break;
flatcat 1:a220fd937508 128 case readOut_Finish:
flatcat 1:a220fd937508 129 state = readOut_IDLE;
flatcat 2:7751080fb267 130 wait_us(sensitivity);
flatcat 1:a220fd937508 131 LED = 0;
flatcat 1:a220fd937508 132 ICG = 1;
flatcat 1:a220fd937508 133 break;
flatcat 1:a220fd937508 134 case readOut_IDLE:
flatcat 1:a220fd937508 135 if (ICG == 1) {
flatcat 4:4eedf8292719 136 // ICG = 0;
flatcat 4:4eedf8292719 137 // state = readOut_Begin;
flatcat 1:a220fd937508 138 }
flatcat 1:a220fd937508 139 break;
flatcat 1:a220fd937508 140 default:
flatcat 1:a220fd937508 141 break;
flatcat 1:a220fd937508 142 }
flatcat 1:a220fd937508 143 }
flatcat 1:a220fd937508 144
flatcat 0:984447b91a04 145 int main()
flatcat 0:984447b91a04 146 {
flatcat 1:a220fd937508 147 ICG = 1;
flatcat 1:a220fd937508 148 LED = 0;
flatcat 1:a220fd937508 149 pixelCount = 0;
flatcat 1:a220fd937508 150 readOutTrigger = 0;
flatcat 1:a220fd937508 151 state = readOut_IDLE;
flatcat 1:a220fd937508 152
flatcat 0:984447b91a04 153 masterClock.period_us(masterFreq_period);
flatcat 0:984447b91a04 154 masterClock.pulsewidth_us(masterFreq_width);
flatcat 0:984447b91a04 155
flatcat 0:984447b91a04 156 shiftGate.period_us(shiftGate_period);
flatcat 0:984447b91a04 157 shiftGate.pulsewidth_us(shiftGate_width);
flatcat 0:984447b91a04 158
flatcat 2:7751080fb267 159 raspi.baud(921600);
flatcat 1:a220fd937508 160 wait(0.5);
flatcat 1:a220fd937508 161
flatcat 1:a220fd937508 162 shiftGate_int.rise(checkState);
flatcat 1:a220fd937508 163
flatcat 0:984447b91a04 164 raspi.baud(921600);
flatcat 0:984447b91a04 165 while(1) {
flatcat 4:4eedf8292719 166 char c = raspi.getc();
flatcat 6:fe473ca8b625 167 switch (c) {
flatcat 4:4eedf8292719 168 case 'r':
flatcat 4:4eedf8292719 169 ICG = 0;
flatcat 4:4eedf8292719 170 state = readOut_Begin;
flatcat 4:4eedf8292719 171 break;
flatcat 4:4eedf8292719 172 default:
flatcat 4:4eedf8292719 173 break;
flatcat 4:4eedf8292719 174 }
flatcat 0:984447b91a04 175 }
flatcat 0:984447b91a04 176 }