129 lines
4.9 KiB
C++
129 lines
4.9 KiB
C++
/* OctoWS2811 VideoDisplay.ino - Video on LEDs, from a PC, Mac, Raspberry Pi
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http://www.pjrc.com/teensy/td_libs_OctoWS2811.html
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Copyright (c) 2013 Paul Stoffregen, PJRC.COM, LLC
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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Required Connections
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--------------------
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pin 2: LED Strip #1 OctoWS2811 drives 8 LED Strips.
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pin 14: LED strip #2 All 8 are the same length.
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pin 7: LED strip #3
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pin 8: LED strip #4 A 100 to 220 ohm resistor should used
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pin 6: LED strip #5 between each Teensy pin and the
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pin 20: LED strip #6 wire to the LED strip, to minimize
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pin 21: LED strip #7 high frequency ringining & noise.
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pin 5: LED strip #8
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pin 15 & 16 - Connect together, but do not use
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pin 4: Do not use
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pin 3: Do not use as PWM. Normal use is ok.
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pin 12: Frame Sync
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When using more than 1 Teensy to display a video image, connect
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the Frame Sync signal between every board. All boards will
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synchronize their WS2811 update using this signal.
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Beware of image distortion from long LED strip lengths. During
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the WS2811 update, the LEDs update in sequence, not all at the
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same instant! The first pixel updates after 30 microseconds,
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the second pixel after 60 us, and so on. A strip of 120 LEDs
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updates in 3.6 ms, which is 10.8% of a 30 Hz video frame time.
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Doubling the strip length to 240 LEDs increases the lag to 21.6%
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of a video frame. For best results, use shorter length strips.
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Multiple boards linked by the frame sync signal provides superior
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video timing accuracy.
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A Multi-TT USB hub should be used if 2 or more Teensy boards
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are connected. The Multi-TT feature allows proper USB bandwidth
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allocation. Single-TT hubs, or direct connection to multiple
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ports on the same motherboard, may give poor performance.
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*/
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// https://stackoverflow.com/questions/18806141/move-object-creation-to-setup-function-of-arduino
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#include "OctoWS2811.h"
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int height = 0;
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int width = 0;
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int ledsPerStrip = 0;
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int count = 0;
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DMAMEM int* displayMemory;
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int* drawingMemory;
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elapsedMicros elapsedUsecSinceLastFrameSync = 0;
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const int config = WS2811_800kHz; // color config is on the PC side
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OctoWS2811 leds;
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void setup() {
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pinMode(13, OUTPUT);
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digitalWrite(13, HIGH);
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Serial.setTimeout(5000);
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//delay(1000);
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Serial.readBytes((char *)&height, sizeof(height));
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Serial.write((char *)&height, sizeof(height));
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Serial.readBytes((char *)&width, sizeof(width));
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Serial.write((char *)&width, sizeof(width));
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digitalWrite(13, LOW);
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//pinMode(12, INPUT_PULLUP); // Frame Sync
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Serial.setTimeout(50);
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ledsPerStrip = width * height;
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displayMemory = new int[ledsPerStrip*6];
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drawingMemory = new int[ledsPerStrip*6];
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leds.attach(ledsPerStrip, displayMemory, drawingMemory, config);
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leds.begin();
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leds.show();
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}
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void loop() {
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int startChar = Serial.read();
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if (startChar == '*') {
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unsigned int startAt = micros();
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unsigned int usecUntilFrameSync = 0;
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count = Serial.readBytes((char *)drawingMemory, sizeof(int) * ledsPerStrip*6);
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Serial.write((char *)drawingMemory, sizeof(int) * ledsPerStrip*6);
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if (count >= sizeof(int) * ledsPerStrip*6) {
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unsigned int endAt = micros();
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unsigned int usToWaitBeforeSyncOutput = 100;
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if (endAt - startAt < usecUntilFrameSync) {
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usToWaitBeforeSyncOutput = usecUntilFrameSync - (endAt - startAt);
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}
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//digitalWrite(12, HIGH);
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//pinMode(12, OUTPUT);
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delayMicroseconds(usToWaitBeforeSyncOutput);
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//digitalWrite(12, LOW);
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// WS2811 update begins immediately after falling edge of frame sync
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digitalWrite(13, HIGH);
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leds.show();
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digitalWrite(13, LOW);
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}
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} else if (startChar >= 0) {
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//Serial.write(startChar);
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//Serial.flush()
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//digitalWrite(13, HIGH);
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//delay(100);
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//digitalWrite(13, LOW);
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// discard unknown characters
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}
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}
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