77 lines
2.7 KiB
Text
77 lines
2.7 KiB
Text
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#include <Wire.h>
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//this code sets values in the MAX5387LAUD+ via I2C.
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//it then reads back those values over A1 and A2 inputs
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//The ADC is set to 12 bits for the DUE
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//Channels are scanned in parallel (0 to 255)
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//then alternatively ascending and descending.
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//Output is a CSV over serial at 9600bps.
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//this test works when testing with board 2
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//Note the MAX5387LAUD+ doesn't support I2C readback.
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byte ADCval;
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byte ADCval1;
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byte ADCval2;
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byte ADCval3;
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byte ADCval4;
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byte ADCval5;
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byte ADCval6;
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void setup() {
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// put your setup code here, to run once:
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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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pinMode(11, OUTPUT);//flash the LED
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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(5, INPUT); //set the interrupt pin for trigger as high impedance, probably not required
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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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ADCval1 = byte(88); // <- start point for the loop
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analogReadResolution(12);
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attachInterrupt(digitalPinToInterrupt(5), toggleLED, RISING);
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}
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void loop() {
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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)); //sets the same value to both channels, if you want to tune each see max5387 datasheet
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Wire.write(ADCval1);// sets register pointer to echo #1 register (0x02)
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Wire.endTransmission(); // stop transmitting
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Serial.print("Both Channels ++ Setpoint 1:"); //note that this is manually updated by the human!
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Serial.print(ADCval1); //note that this is manually updated by the human!
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Serial.print("; Setpoint 2:"); //note that this is manually updated by the human!
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Serial.print(ADCval1); //note that this is manually updated by the human!
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Serial.print("; A1:");
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Serial.print(analogRead(A1));
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Serial.print("; A2:");
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Serial.print(analogRead(A2));
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Serial.println(";");
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delay(10000); //how long to wait before trying the new value
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ADCval1++; //incrememnt the channel value
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//digitalWrite(11, LOW); //reset the LED to low; interrupt sets it high
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}
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void toggleLED(){
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digitalWrite(11, HIGH); //makes the LED on the board flash
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digitalWrite(11, LOW); //reset the LED to low; interrupt sets it high
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}
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