75 lines
No EOL
3 KiB
Text
75 lines
No EOL
3 KiB
Text
#include <Wire.h>
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//this test works when testing with boards 1 and 2
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//set the threshold as a 1 time value, max is 3.3V (voltage reference removed from protos)
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//crashes due to 50Hz noise
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//input thresholds not checked 100%
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//minimum input signal duration 40ns for coincidence.
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//at 40ns incident coincidence the output lasts for 150ns - plenty for the DUE to capture.
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//Hardware is more reliable than DUE's noise immunity.
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//Note the MAX5387LAUD+ doesn't support I2C readback.
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//detailed threshold calibration could be done, but our signal generator doesn't plug in very well.
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//using DAC would be a nice option for checking the thresholds.
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void setup() {
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// put your setup code here, to run once:
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pinMode(48, OUTPUT); //used to inject 3.3V signals if required with jumpers
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pinMode(49, OUTPUT); //used to inject as well
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pinMode(35, OUTPUT); //setup for the MAX5387 - later set to 0. signal PA0
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pinMode(36, OUTPUT);//setup for the MAX5387 - later set to 0. signal PA1
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pinMode(37, OUTPUT);//setup for the MAX5387 - later set to 0. signal PA2
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pinMode(A1, INPUT); //make sure the input pins are in high impedance mode
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pinMode(A2, INPUT);//make sure the input pins are in high impedance mode
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digitalWrite(35, LOW);//configure the address of the MAX5387 pot
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digitalWrite(36, LOW);//configure the address of the MAX5387 pot
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digitalWrite(37, LOW);//configure the address of the MAX5387 pot
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//pinMode(38, INPUT); //optional high impedance mode for strigA - note forcing signal high doesn't really work.
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//pinMode(39, INPUT);//optional high impedance mode for strigB - note forcing signal high doesn't really work.
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pinMode(5, INPUT); //set the interrupt pin for trigger as high impedance, probably not required
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attachInterrupt(38, striga, RISING); //interrupt on STRIGA
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attachInterrupt(39, strigb, RISING); //interrupt on STRIGB
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attachInterrupt(5, realint, RISING); //interrupt on the real trigger - note rising,
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//setup the serial for debug
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Serial.begin(9600);
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//setup the MAX5387 pot
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Wire.begin();
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Serial.print("MAX5387 Address ");
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Serial.print(0x28, HEX);
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Wire.beginTransmission(byte(0x28)); // transmit to device #112
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Wire.write(byte(B00010011));
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Wire.write(byte(0x50));// sets register pointer to echo #1 register (0x02)
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Wire.endTransmission(); // stop transmitting
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Serial.println("threshold set to 0x50"); //note that this is manually updated by the human!
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}
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//interrupt routine for event on STRIGA signal (channel A high)
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void striga(){
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Serial.print("a");
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}
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//interrupt routine for event on STRIGB signal (channel B high)
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void strigb(){
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Serial.println("b");
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}
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//interrupt routine for event on TRIG signal (AND output high)
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void realint(){
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Serial.println("real");
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}
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void loop() {
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// put your main code here, to run repeatedly:
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//nothing to do here at the moment.
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//delay(100);
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//digitalWrite(48, HIGH); //3.3v signal injections via pins 48 and 49 if required.
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//digitalWrite(49, HIGH);
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//digitalWrite(48, LOW);
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//digitalWrite(49, LOW);
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//delay(1000);
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} |