firmware/DACController.cpp at master · OpenAFM/firmware · GitHub

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#include"DACController.h"

#defineONHIGH
#defineOFFLOW

// Channels available in chip.
externconstintCHANNEL_A = 0;
externconstintCHANNEL_B = 1;
externconstintCHANNEL_C = 2;
externconstintCHANNEL_D = 3;

// constructor
DACController::DACController(int stepSize, int lineLength, int dataPin, int clockPin, int loadPin, int ldacPin, bool useRNG) {
this->stepSize = stepSize;
this->lineSize = lineLength;

this->clockPin = clockPin;
this->dataPin = dataPin;
this->loadPin = loadPin;
this->ldacPin = ldacPin;
this->useRNG = useRNG;

this->currentStep = 0;
this->currentX = 0;
this->currentY = 0;
this->currentZ = 0;

pinMode(this->dataPin, OUTPUT);
pinMode(this->clockPin, OUTPUT);
pinMode(this->loadPin, OUTPUT);
pinMode(this->ldacPin, OUTPUT);

digitalWrite(this->loadPin, ON);
digitalWrite(this->ldacPin, OFF);

// command is clocked on rising edge
digitalWrite(this->clockPin, OFF);

	invertChannels = false;
}

// destructor.
DACController::~DACController() {}

// reset parameters
unsignedintDACController::reset(int stepSize, int lineSize, int dataPin, int clockPin, int loadPin, int ldacPin, bool useRNG) {
this->stepSize = stepSize;
this->lineSize = lineSize;

this->clockPin = clockPin;
this->dataPin = dataPin;
this->loadPin = loadPin;
this->ldacPin = ldacPin;
this->useRNG = useRNG;

this->currentStep = 0;
this->currentX = 0;
this->currentY = 0;
this->currentZ = 0;

pinMode(this->dataPin, OUTPUT);
pinMode(this->clockPin, OUTPUT);
pinMode(this->loadPin, OUTPUT);
pinMode(this->ldacPin, OUTPUT);

digitalWrite(this->loadPin, ON);
digitalWrite(this->ldacPin, OFF);

// command is clocked on rising edge
digitalWrite(this->clockPin, OFF);

	invertChannels = false;

return currentStep;
}


const byte mask = 128;


// set voltage value for given channel
intDACController::go(int channel, int value) {

// Set DAC Channel LMB (left most significant bit)
// 0 0 = A X
// 0 1 = B Y
// 1 0 = C Z
// 1 1 = D -

switch (channel)
	{
caseCHANNEL_A:
setBitOff();
setBitOff();
break;

caseCHANNEL_B:
setBitOff();
setBitOn();
break;

caseCHANNEL_C:
setBitOff();
setBitOn();
break;

caseCHANNEL_D:
setBitOn();
setBitOff();
break;
	}

// 1x gain (0) or 2x (1)
	useRNG ? setBitOn() : setBitOff();

/*
	for (int i = 7; i >= 0; i--)
	{
 // shifting bits to the right.
 int k = value >> i;

 // true if k (LMS) is 1
 if (k & 1) {
 sendHighSignal();
 } else {
 sendLowSignal();
 }
	}
*/
for (int i = 0; i <= 7; i++) {
if (value & mask) {
setBitOn();
 } else {
setBitOff();
 }
 value = value << 1;
	}
delay(2);
// load to output registers
loadDAC();
}

// send high
intDACController::setBitOn() {
digitalWrite(clockPin, ON);
digitalWrite(dataPin, ON);
digitalWrite(clockPin, OFF);
}
// send low
intDACController::setBitOff() {
digitalWrite(clockPin, ON);
digitalWrite(dataPin, OFF);
digitalWrite(clockPin, OFF);
}

// load dac
intDACController::loadDAC() {
digitalWrite(loadPin, OFF);
digitalWrite(loadPin, ON);
digitalWrite(dataPin, OFF);
}

// reset coordinates to 0,0
unsignedintDACController::reset() {
	currentStep = 0;
	currentZ = 0;
setCoordinates();
go(CHANNEL_A, currentX);
go(CHANNEL_B, currentY);
return currentStep;
}

// move to beginning of next line.
unsignedintDACController::nextLine() {
int delta = (((currentStep / lineSize) + 1) * lineSize) - currentStep;
	currentStep += delta;
setCoordinates();
go(CHANNEL_A, currentX);
go(CHANNEL_B, currentY);
return currentStep;
}

// go to end of current line
unsignedintDACController::eol() {
nextLine();
	currentStep--;
setCoordinates();
go(CHANNEL_A, currentX);
go(CHANNEL_B, currentY);
return currentStep;
}

// set coordinates relative to currentStep
intDACController::setCoordinates() {
	currentX = currentStep % lineSize;
	currentY = currentStep / lineSize;

if (invertChannels) {
int temp = currentX;
 currentX = currentY;
 currentY = temp;
	}
}

// increase voltage
unsignedintDACController::increaseVoltage() {

// step fwd
	currentStep += stepSize;

setCoordinates();

go(CHANNEL_A, currentX);
go(CHANNEL_B, currentY);

return currentStep;
}

// decrease voltage
unsignedintDACController::decreaseVoltage() {

// step back
	currentStep -= stepSize;

setCoordinates();

go(CHANNEL_A, currentX);
go(CHANNEL_B, currentY);

return currentStep;
}

// return current line size.
intDACController::getLineSize() {
return lineSize;
}

// return current voltage for given channel
intDACController::getVoltage(int channel) {

switch (channel) {

caseCHANNEL_A:
return currentX;
caseCHANNEL_B:
return currentY;
caseCHANNEL_C:
return currentZ;

default:
return -1;
	}
}

voidDACController::invert() {
	invertChannels = !invertChannels;
}