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- #include <Arduino.h>
- #include <ports.h>
- #include <base.h>
- #include <DirectIO.h>
- #include <Adafruit_NeoPixel.h>
- #include <TimerOne.h>
- #define CLKPIN TIMER1_A_PIN
- #define TRGPIN 4
- #define DEBUGPIN 6
- #define FIRSTFIELD 7
- #ifndef cbi
- #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
- #endif
- #ifndef sbi
- #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
- #endif
- Output<TRGPIN> trg;
- Output<CLKPIN> clk;
- Output<6> dbg;
- Output<FIRSTFIELD> ff;
- #define NUMPIXELS 8
- #define NEO_PIN 8
- Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, NEO_PIN, NEO_RGB + NEO_KHZ800);
- const uint8_t PROGMEM gamma8[] = {
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
- 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
- 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
- 10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
- 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
- 25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
- 37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
- 51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
- 69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
- 90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
- 115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
- 144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
- 177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
- 215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
- void setup() {
- analogReference(EXTERNAL);
- pinMode(CLKPIN, OUTPUT);
- //pinMode(DEBUGPIN, OUTPUT);
- Timer1.initialize(1); // ~1mhz
- Timer1.pwm(CLKPIN, 512); // 50% duty cycle
- Timer1.stop();
- pinMode(TRGPIN, OUTPUT);
- pinMode(A0, INPUT);
- pinMode(ledToPin(0), OUTPUT);
- pinMode(ledToPin(1), OUTPUT);
- pinMode(ledToPin(2), OUTPUT);
- Serial.begin(115200);
- cbi(ADCSRA, ADPS0);
- cbi(ADCSRA, ADPS1);
- cbi(ADCSRA, ADPS2);
- sbi(ADCSRA, ADPS1);
- // Serial.print("prescaler = ");
- // Serial.println(ADCSRA & 0xE0);
- pixels.begin();
- }
- int avgRead(int port, int samples)
- {
- int i;
- long reading = 0;
- for(i = 0; i < samples; i++)
- {
- reading += analogRead(port);
- }
- reading /= samples;
- return reading;
- }
- void clockCycle(int pin, int count)
- {
- while(count--)
- {
- digitalWrite(pin, HIGH);
- digitalWrite(pin, LOW);
- }
- }
- int ledToPin(int color)
- {
- switch(color)
- {
- case 0: // red
- return 2;
- break;
- case 1: // green
- return 3;
- break;
- case 2: // blue
- return 5;
- break;
- }
- }
- void ledOn(int color)
- {
- digitalWrite(ledToPin(color), LOW);
- }
- void ledOff(int color)
- {
- digitalWrite(ledToPin(color), HIGH);
- }
- void ledsOn()
- {
- for(int i = 0; i <= 2; i++)
- ledOn(i);
- }
- void ledsOff()
- {
- for(int i = 0; i <= 2; i++)
- ledOff(i);
- }
- // returns n samples from start of readback to end of readback
- void readLine(byte* output, int samples)
- {
- int zeroLevel;
- int blackLevel;
- int clocks;
- int i;
- int samplePos = 2593 / samples;
- int currSample = 0;
- shiftOut(TRGPIN, CLKPIN, MSBFIRST, 0xF0); // trigger pulse and slow clock
- // lock step through front porch with slow clock in order to capture reference levels without unpredictable jitter
- clockCycle(CLKPIN, 4);
- // sample black level
- for(i=0; i < 3; i++)
- {
- clocks=5; while(clocks--)
- {
- clk=1;
- clk=0;
- }
- blackLevel += avgRead(A0, 3);
- }
- blackLevel /= 3;
- // Serial.print("blackLevel = ");
- // Serial.println(blackLevel);
- // 65 more clock cycles until analog goodies
- clocks = 65; while(clocks--)
- {
- clk=1;
- clk=0;
- }
- #define ANALOG_CLOCKS (12 * 216 + 1)
- int stepSpacing = ANALOG_CLOCKS / samples;
- int nextSample = 0;
- // go through analog bins
- for(i = 0; i < 12 * 216 + 1; i++)
- {
- clk = 1;
- if(nextSample-- == 0)
- {
- dbg=1;
- nextSample = stepSpacing;
- // output[currSample++] = map(avgRead(A0, 5), blackLevel, 1024, 0, 255);
- output[currSample++] = map(analogRead(A0), blackLevel, 1024, 0, 255);
- dbg=0;
- }
- clk = 0;
- }
- #if 0
- for(i = 0; i < 2593; i++)
- {
- clk =1;
- clk =0;
- }
- #endif
- }
- void loop() {
- int led = 0;
- byte samples[64];
- byte redSamples[NUMPIXELS];
- byte greenSamples[NUMPIXELS];
- byte blueSamples[NUMPIXELS];
- int i;
- ff=1;
- ff=0;
- #if 1
- ledOn(0);
- readLine(redSamples, NUMPIXELS);
- ledsOff();
- ledOn(1);
- readLine(greenSamples, NUMPIXELS);
- ledsOff();
- ledOn(2);
- readLine(blueSamples, NUMPIXELS);
- ledsOff();
- #endif
- #if 0
- for(led = 0; led < 0; led++){
- ledOn(led);
- readLine(samples, 4);
- ledOff(led);
- }
- ledsOff();
- #endif
- for(i = 0; i < NUMPIXELS; i++)
- {
- #if 0
- Serial.print("sample[");
- Serial.print(i);
- Serial.println("] = ");
- Serial.print("red ");
- Serial.println(redSamples[i]);
- Serial.print("green ");
- Serial.println(greenSamples[i]);
- Serial.print("blue ");
- Serial.println(blueSamples[i]);
- #endif
- pixels.setPixelColor(i, pixels.Color(pgm_read_byte(&gamma8[greenSamples[i]]), pgm_read_byte(&gamma8[redSamples[i]]), pgm_read_byte(&gamma8[blueSamples[i]])));
- // pixels.setPixelColor(i, pixels.Color(0, 0, 0));
- // pixels.setPixelColor(i, pixels.Color(redSamples[i], greenSamples[i], blueSamples[i]));
- // pixels.setPixelColor(i, pixels.Color(pgm_read_byte(&gamma8[redSamples[i]]), pgm_read_byte(&gamma8[greenSamples[i]]), pgm_read_byte(&gamma8[blueSamples[i]])));
- // pixels.setPixelColor(i, pixels.Color(pgm_read_byte(&gamma8[redSamples[i]]), pgm_read_byte(&gamma8[redSamples[i]]), pgm_read_byte(&gamma8[redSamples[i]])));
- pixels.show(); // This sends the updated pixel color to the hardware.
- }
- // delay(100);
- //delayMicroseconds(100);
- }
- void old_loop() {
- int bin;
- int i;
- int samples[12];
- int clocks;
- int zeroLevel;
- int blackLevel;
- static int led=0;
- //shiftOut(TRGPIN, CLKPIN, MSBFIRST, 0);
- dbg=1;
- zeroLevel = avgRead(A0, 5);
- // zeroLevel = analogRead(A0);
- dbg=0;
- dbg=1;
- shiftOut(TRGPIN, CLKPIN, MSBFIRST, 0xF0); // trigger pulse and slow clock
- dbg=0;
- // lock step through front porch with slow clock in order to capture reference levels without unpredictable jitter
- dbg=1;
- clockCycle(CLKPIN, 4);
- dbg=0;
- dbg=1;
- for(i=0; i < 3; i++)
- {
- clocks=5; while(clocks--)
- {
- clk=1;
- clk=0;
- }
- blackLevel += avgRead(A0, 3);
- }
- blackLevel /= 4;
- // Serial.print("blackLevel = ");
- // Serial.println(blackLevel);
- dbg=0;
- if(led == 0){
- ff = 1;
- ff = 0;
- }
- ledOn(led);
- //ledsOn();
- dbg=1;
- clocks = 40; while(clocks--)
- {
- clk=1;
- clk=0;
- }
- dbg=0;
- for(i = 0; i < 350*8; i++)
- {
- clk =1;
- clk =0;
- }
- dbg =1;
- dbg=0;
- // Timer1.pwm(CLKPIN, 512); // fast clock
- /* dbg=1;
- for(i = 0; i < 300; i++)
- {
- samples[i] = analogRead(A0);
- //delayMicroseconds(2000);
- }
- dbg=0;
- */
- // sample front porch reference level 2 clocks later, for 80 hs clocks
- // sample bins 83 clocks after fast start
- // bins seem to be 215 clocks wide, 12 bins, 1 clock per pixel
- //delayMicroseconds(1);
- #if 0
- dbg=1;
- noInterrupts();
- while(analogRead(A0) -5 < zeroLevel)
- ;
- interrupts();
- // wait for voltage to increase to follow clock jitter
- dbg=0;
- #endif
- dbg = 1;
- blackLevel = avgRead(A0, 5);
- // blackLevel = analogRead(A0);
- dbg = 0;
- #if 0
- noInterrupts();
- while(analogRead(A0) -10< blackLevel)
- {
- dbg=1;
- delayMicroseconds(0);
- dbg=0;
- }
- ;
- interrupts();
- #endif
- dbg = 1;
- delayMicroseconds(1);
- dbg = 0;
- /*
- delayMicroseconds(100);
- dbg=1;
- bin= analogRead(A0);
- dbg=0;
- */
- // delayMicroseconds(2670);
- Timer1.stop();
- digitalWrite(CLKPIN, LOW);
- /*
- Serial.print("zeroLevel = ");
- Serial.println(zeroLevel);
- Serial.print("blackLevel = ");
- Serial.println(blackLevel);
- /* Serial.print("bin = ");
- Serial.println(bin);
- */
- //delay(50);
- #if 1
- ledOff(led);
- // switch LED
- if(++led > 2)
- led = 0;
- #endif
- //ledsOff();
- // Serial.println(led);
- // Serial.print("normalized = ");
- // Serial.println(map(bin - blackLevel, zeroLevel, 1024, 0, 255));
- //delay(10); // inter line delay
- delayMicroseconds(100);
- }
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