#include <IntervalTimer.h>
#include <ADC.h>
#include <RingBuffer.h> // normally use this line
// #include "RingBuffer.h" // I have RingBuffer in local directory
#include <math.h>
// The following from ADC_Module.h
// Other things to measure with the ADC that don't use external pins
// In my Teensy I read 1.22 V for the ADC_VREF_OUT (doesn't exist in Teensy LC), random values for ADC_BANDGAP,
// 3.3 V for ADC_VREFH and 0.0 V for ADC_VREFL.
#define ADC_TEMP_SENSOR 38 // 0.719 V at 25\BAC and slope of 1.715 mV/\BAC for Teensy 3.x and 0.716 V, 1.62 mV/\BAC for Teensy LC
#define ADC_VREF_OUT 39
#define ADC_BANDGAP 41
#define ADC_VREFH 42
#define ADC_VREFL 43
#define LED_POWER 13
// adc variables
ADC *adc = new ADC(); // adc object
ADC::Sync_result adcValues;
ADC_Module::ADC_Config ADCtemperatureConfig;
void setADCdifferential(), setADCsingle(); // setup ADC
bool startADC;
RingBuffer *temperatureRingBuffer1 = new RingBuffer(), *temperatureRingBuffer2 = new RingBuffer();
const float Fs = 128; // force integer sampling rate and a multiple of Fw (assuming Fw <= 3 decimal places
// Timer setup and variables to call interrupt for ADC initialization
IntervalTimer samplingTimer; // interrupt timer for sampling
int timerReturnValue, timerPriorityReturnValue; // timer return values for testing
elapsedMicros ISRtime = 0;
uint32_t ISRtime01;
uint32_t temperature1Raw, temperature2Raw;
void setup() {
// initialize the light & pins
pinMode(LED_POWER, OUTPUT);
pinMode(A2, INPUT);
pinMode(A3, INPUT);
pinMode(A4, INPUT);
pinMode(A5, INPUT);
pinMode(A10, INPUT);
pinMode(A12, INPUT);
pinMode(38, INPUT);
Serial.begin(9600); // for debugging or datalogging
delay(2000);
Serial.println("Starting Serial Port");
// set ADC parameters
Serial.print("ISR Frequency ");
Serial.println(Fs);
// set interrupt timer with sampling time in microseconds
timerReturnValue = samplingTimer.begin(sampleBeginISR, 1e6 / Fs);
// enable adc interrupts just before the main loop
adc->enableInterrupts(); // call interrupt to read value upon completion of ADC
}
void sampleBeginISR(void) {
noInterrupts();
// Start ADC
setADCsingle1(); // set ADC for single-ended measurement
Serial.print("StartADC0 a - Successful - ");
attachInterruptVector(IRQ_ADC0, singleReadADC0_isr1);
startADC = adc->startSingleRead(38, 0);
Serial.println(startADC);
interrupts();
}
void sample2isr() {
noInterrupts();
setADCsingle2(); // set ADC for single-ended measurement
Serial.print("\tStartADC0 b - Successful - ");
attachInterruptVector(IRQ_ADC0, singleReadADC0_isr2);
startADC = adc->startSingleRead(38, 0);
Serial.println(startADC);
interrupts();
}
// Single-ended read data and reset for differential measurement
void singleReadADC0_isr1() {
// put single-ended values into a ring buffer
noInterrupts();
Serial.print("\tStartADC0 b - Successful - ");
temperatureRingBuffer1->write(adc->readSingle());
attachInterruptVector(IRQ_ADC0, singleReadADC0_isr2);
startADC = adc->startSingleRead(38, 0);
Serial.println(startADC);
Serial.println("Read temperature 1 ADC subroutine executed");
interrupts();
}
// Single-ended read data and reset for differential measurement
void singleReadADC0_isr2() {
// put single-ended values into a ring buffer
noInterrupts();
temperatureRingBuffer2->write(adc->readSingle());
interrupts();
Serial.println("Read Temperature 2 ADC subroutine executed");
}
void setADCsingle1() {
Serial.println("setADCsingle 1 subroutine executed");
// ADC 0
// one of ADC_REF_3V3, ADC_REF_1V2, ADC_REF_EXT.
//adc->setReference(ADC_REF_1V2, ADC_0); // change all 3.3 to 1.2 if you change the reference to 1V2
adc->setReference(ADC_REF_1V2, ADC_0); //ADC_REF_3V3, ADC_REF_1V2, ADC_REF_EXT
// adc->enablePGA(1, ADC_0); // options are 1, 2, 4, 8, 16, 32 or 64
adc->setAveraging(64, ADC_0);
adc->setResolution(ADC_MED_SPEED, ADC_0); // see ADC.h
// one of ADC_VERY_LOW_SPEED, ADC_LOW_SPEED, ADC_MED_SPEED, ADC_HIGH_SPEED_16BITS, ADC_HIGH_SPEED, ADC_VERY_HIGH_SPEED
adc->setConversionSpeed(ADC_MED_SPEED, ADC_0); // see ADC.h for options
// one of ADC_VERY_LOW_SPEED, ADC_LOW_SPEED, ADC_MED_SPEED, ADC_HIGH_SPEED, ADC_VERY_HIGH_SPEED
adc->setSamplingSpeed(ADC_MED_SPEED, ADC_0); // see ADC.h for options
// save configuration
// ADC_Module::saveConfig(*ADCtemperatureConfig);
}
void setADCsingle2() {
Serial.println("setADCsingle 2 subroutine executed");
// ADC 0
// one of ADC_REF_3V3, ADC_REF_1V2, ADC_REF_EXT.
//adc->setReference(ADC_REF_1V2, ADC_0); // change all 3.3 to 1.2 if you change the reference to 1V2
adc->setReference(ADC_REF_1V2, ADC_0); //ADC_REF_3V3, ADC_REF_1V2, ADC_REF_EXT
// adc->enablePGA(1, ADC_0); // options are 1, 2, 4, 8, 16, 32 or 64
adc->setAveraging(1, ADC_0);
adc->setResolution(ADC_VERY_HIGH_SPEED, ADC_0); // see ADC.h
// one of ADC_VERY_LOW_SPEED, ADC_LOW_SPEED, ADC_MED_SPEED, ADC_HIGH_SPEED_16BITS, ADC_HIGH_SPEED, ADC_VERY_HIGH_SPEED
adc->setConversionSpeed(ADC_VERY_HIGH_SPEED, ADC_0); // see ADC.h for options
// one of ADC_VERY_LOW_SPEED, ADC_LOW_SPEED, ADC_MED_SPEED, ADC_HIGH_SPEED, ADC_VERY_HIGH_SPEED
adc->setSamplingSpeed(ADC_MED_SPEED, ADC_0); // see ADC.h for options
// save configuration
// ADC_Module::saveConfig(*ADCtemperatureConfig);
}
void loop() {
// check temperature only if the temperature ring buffer is not empty
if (!temperatureRingBuffer2->isEmpty()) {
// read data from ringBuffer
noInterrupts();
temperature1Raw = temperatureRingBuffer1->read();
temperature2Raw = temperatureRingBuffer2->read();
interrupts();
Serial.print("Read Ring Buffer");
Serial.print("\t");
Serial.print(temperatureRingBuffer1->isEmpty());
Serial.print("\t");
Serial.print(temperature1Raw);
Serial.print("\t");
Serial.println(temperature2Raw);
}
}
