Diff: main.cpp

Revision:

0:984447b91a04

Child:

1:a220fd937508

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Aug 15 10:35:34 2014 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+
+//  ***   BE SURE TO TEST BEFORE AND AFTER FOR 'IDLING'... CLEAR THE CCD EVERY OTHER FRAME TO TRY AND ELIMINATE NOISE BUILDUP
+//From http://www.ing.iac.es/~docs/ins/das/ins-das-29/integration.html
+//"Idling" vs. integrating
+//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
+//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
+//background leading up to a saturated region in the low-numbered rows.)
+//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.
+
+PwmOut shiftGate(PB_8);
+PwmOut icg(PB_3);
+PwmOut masterClock(PB_4);
+AnalogIn imageIn(A0);
+AnalogOut imageOut(A5);
+DigitalOut myled(LED1);
+Serial raspi(USBTX, USBRX);
+
+int masterFreq_period = 2;      //microseconds
+int masterFreq_width  = 1;      //microseconds
+int icgFreq_period    = 500000; //microseconds
+int icgFreq_width     = 250000; //microseconds    <------------- LOWER THIS NUMBER TO INCREASE SENSITIVITY
+int shiftGate_delay   = 287;    //microseconds
+int shiftGate_period  = 200;    //microseconds
+int shiftGate_width   = 100;    //microseconds
+
+#define MV(x) ((0xFFF*x)/3300)
+
+int main()
+{
+    // set the masterClock
+    masterClock.period_us(masterFreq_period);
+    masterClock.pulsewidth_us(masterFreq_width);
+
+    // set the ICG clock and have it start 82.76ms after the shiftGate - this will sync the clocks up so the ICQ is going low slightly before the shiftGate is going high
+    icg.period_us(icgFreq_period);
+    icg.pulsewidth_us(icgFreq_width);  //          <------------- LOWER THIS NUMBER TO INCREASE SENSITIVITY
+
+    // set the shiftGate and have it start 15us after the masterClock - this will sync the clocks up so the shiftGate is going high just as a clock cycle is going high
+    wait_us(shiftGate_delay);
+    shiftGate.period_us(shiftGate_period);
+    shiftGate.pulsewidth_us(shiftGate_width);
+
+    raspi.baud(921600);
+    // do something while it's having fun..
+    while(1) {
+//        wait(.0001);
+//        uint16_t meas = imageIn.read_u16();
+//        if (meas < MV(1000)) {
+//            myled = 1;
+//            printf("BINGO: %d \r\n", meas);
+//        }
+//        myled = 0;
+        imageOut.write(imageIn.read());
+    }
+}
+