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start of actual OneWireIO project

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Youen Toupin 10 years ago
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a474a381f9
2 changed files with 105 additions and 72 deletions
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  1. 75
      OneWireIO.ino
  2. 102
      Oscilloscope.ino

75
OneWireIO.ino
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@ -5,19 +5,6 @@
#define OWPin 2 #define OWPin 2
#define InterruptNumber 0 // Must correspond to the OWPin to correctly detect state changes. On Arduino Uno, interrupt 0 is for digital pin 2 #define InterruptNumber 0 // Must correspond to the OWPin to correctly detect state changes. On Arduino Uno, interrupt 0 is for digital pin 2
// how many samples we want to skip between two samples we keep (can be used to lower the sampling frequency)
#define SkipSamples 0
byte regularEncodedFrequency;
const int BufferSize = 512;
byte buffer1[BufferSize];
byte buffer2[BufferSize];
byte* backBuffer = buffer1;
volatile short backBufferPos = 0;
byte samplesSkipped = SkipSamples;
unsigned long backBufferStartTime = micros();
SerialChannel oscilloscope("oscilloscope");
SerialChannel debug("debug"); SerialChannel debug("debug");
void setup() void setup()
@ -27,76 +14,20 @@ void setup()
digitalWrite(LEDPin, LOW); digitalWrite(LEDPin, LOW);
//attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE); attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE);
cli();//disable interrupts
//set up continuous sampling of analog pin 0
//clear ADCSRA and ADCSRB registers
ADCSRA = 0;
ADCSRB = 0;
ADMUX |= (1 << REFS0); //set reference voltage
ADMUX |= (1 << ADLAR); //left align the ADC value- so we can read highest 8 bits from ADCH register only
int ADPS = (1 << ADPS2) | (0 << ADPS1) | (1 << ADPS0);
ADCSRA |= ADPS; //set ADC clock with 32 prescaler- 16mHz/32=500KHz ; 13 cycles for a conversion which means 38000 samples per second
ADCSRA |= (1 << ADATE); //enabble auto trigger
ADCSRA |= (1 << ADIE); //enable interrupts when measurement complete
ADCSRA |= (1 << ADEN); //enable ADC
ADCSRA |= (1 << ADSC); //start ADC measurements
regularEncodedFrequency = (byte)ADPS;
byte skipSamples = 0;
#if SkipSamples > 0
skipSamples = SkipSamples;
#endif
regularEncodedFrequency |= skipSamples << 3;
sei();//enable interrupts
Serial.begin(400000); Serial.begin(400000);
} }
void loop() void loop()
{ {
while(backBufferPos < BufferSize / 2) ;
cli();//disable interrupts cli();//disable interrupts
byte* currentBuffer = backBuffer;
short currentBufferSize = backBufferPos;
backBuffer = (backBuffer == buffer1 ? buffer2 : buffer1);
backBufferPos = 0;
sei();//enable interrupts
unsigned long currentBufferStartTime = backBufferStartTime;
backBufferStartTime = micros();
digitalWrite(LEDPin, LOW);
//Serial.write(currentBuffer, currentBufferSize); sei();//enable interrupts
oscilloscope.beginWrite(currentBufferSize + 1, currentBufferStartTime);
oscilloscope.continueWrite(&regularEncodedFrequency, 1);
oscilloscope.continueWrite(currentBuffer, currentBufferSize);
}
ISR(ADC_vect) {//when new ADC value ready
byte sample = ADCH; //store 8 bit value from analog pin 0
#if SkipSamples > 0
if(samplesSkipped++ < SkipSamples)
return;
samplesSkipped = 0;
#endif
backBuffer[backBufferPos++] = sample;
if(backBufferPos >= BufferSize)
{
// overflow of back buffer, we loose the current sample
digitalWrite(LEDPin, HIGH);
backBufferPos = BufferSize - 1;
}
} }
void onewireInterrupt(void) void onewireInterrupt(void)
{ {
//digitalWrite(LEDPin, digitalRead(OWPin)); digitalWrite(LEDPin, digitalRead(OWPin));
} }

102
Oscilloscope.ino
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@ -0,0 +1,102 @@
#include "Arduino.h"
#include "SerialChannel.h"
#define LEDPin 13
#define OWPin 2
#define InterruptNumber 0 // Must correspond to the OWPin to correctly detect state changes. On Arduino Uno, interrupt 0 is for digital pin 2
// how many samples we want to skip between two samples we keep (can be used to lower the sampling frequency)
#define SkipSamples 0
byte regularEncodedFrequency;
const int BufferSize = 512;
byte buffer1[BufferSize];
byte buffer2[BufferSize];
byte* backBuffer = buffer1;
volatile short backBufferPos = 0;
byte samplesSkipped = SkipSamples;
unsigned long backBufferStartTime = micros();
SerialChannel oscilloscope("oscilloscope");
SerialChannel debug("debug");
void setup()
{
pinMode(LEDPin, OUTPUT);
pinMode(OWPin, INPUT);
digitalWrite(LEDPin, LOW);
//attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE);
cli();//disable interrupts
//set up continuous sampling of analog pin 0
//clear ADCSRA and ADCSRB registers
ADCSRA = 0;
ADCSRB = 0;
ADMUX |= (1 << REFS0); //set reference voltage
ADMUX |= (1 << ADLAR); //left align the ADC value- so we can read highest 8 bits from ADCH register only
int ADPS = (1 << ADPS2) | (0 << ADPS1) | (1 << ADPS0);
ADCSRA |= ADPS; //set ADC clock with 32 prescaler- 16mHz/32=500KHz ; 13 cycles for a conversion which means 38000 samples per second
ADCSRA |= (1 << ADATE); //enabble auto trigger
ADCSRA |= (1 << ADIE); //enable interrupts when measurement complete
ADCSRA |= (1 << ADEN); //enable ADC
ADCSRA |= (1 << ADSC); //start ADC measurements
regularEncodedFrequency = (byte)ADPS;
byte skipSamples = 0;
#if SkipSamples > 0
skipSamples = SkipSamples;
#endif
regularEncodedFrequency |= skipSamples << 3;
sei();//enable interrupts
Serial.begin(400000);
}
void loop()
{
while(backBufferPos < BufferSize / 2) ;
cli();//disable interrupts
byte* currentBuffer = backBuffer;
short currentBufferSize = backBufferPos;
backBuffer = (backBuffer == buffer1 ? buffer2 : buffer1);
backBufferPos = 0;
sei();//enable interrupts
unsigned long currentBufferStartTime = backBufferStartTime;
backBufferStartTime = micros();
digitalWrite(LEDPin, LOW);
//Serial.write(currentBuffer, currentBufferSize);
oscilloscope.beginWrite(currentBufferSize + 1, currentBufferStartTime);
oscilloscope.continueWrite(&regularEncodedFrequency, 1);
oscilloscope.continueWrite(currentBuffer, currentBufferSize);
}
ISR(ADC_vect) {//when new ADC value ready
byte sample = ADCH; //store 8 bit value from analog pin 0
#if SkipSamples > 0
if(samplesSkipped++ < SkipSamples)
return;
samplesSkipped = 0;
#endif
backBuffer[backBufferPos++] = sample;
if(backBufferPos >= BufferSize)
{
// overflow of back buffer, we loose the current sample
digitalWrite(LEDPin, HIGH);
backBufferPos = BufferSize - 1;
}
}
void onewireInterrupt(void)
{
//digitalWrite(LEDPin, digitalRead(OWPin));
}
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