258 lines
6.7 KiB
C++
258 lines
6.7 KiB
C++
/* LEDstream_FastLED
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*
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* Modified version of Adalight protocol that uses the FastLED
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* library (http://fastled.io) for driving led strips.
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*
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* http://github.com/dmadison/Adalight-FastLED
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*
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* --------------------------------------------------------------------
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* --------------------------------------------------------------------
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*/
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// --- General Settings
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static const uint16_t
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Num_Leds = 80; // strip length
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static const uint8_t
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Led_Pin = 6, // Arduino data output pin
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Brightness = 255; // maximum brightness
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// --- FastLED Setings
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#define LED_TYPE WS2812B // led strip type for FastLED
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#define COLOR_ORDER GRB // color order for bitbang
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// --- Serial Settings
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static const unsigned long
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SerialSpeed = 115200; // serial port speed, max available
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static const uint16_t
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SerialTimeout = 150; // time before LEDs are shut off if no data (in seconds)
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// --- Optional Settings (uncomment to add)
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//#define CLEAR_ON_START // LEDs are cleared on reset
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//#define SERIAL_FLUSH // Serial buffer cleared on LED latch
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//#define GROUND_PIN 10 // additional grounding pin (optional)
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//#define CALIBRATE // sets all LEDs to the color of the first
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// --- Debug Settings (uncomment to add)
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//#define DEBUG_LED 13 // toggles the Arduino's built-in LED on header match
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//#define DEBUG_FPS 8 // enables a pulse on LED latch
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// --------------------------------------------------------------------
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#include <FastLED.h>
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CRGB leds[Num_Leds];
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uint8_t * ledsRaw = (uint8_t *)leds;
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// A 'magic word' (along with LED count & checksum) precedes each block
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// of LED data; this assists the microcontroller in syncing up with the
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// host-side software and properly issuing the latch (host I/O is
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// likely buffered, making usleep() unreliable for latch). You may see
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// an initial glitchy frame or two until the two come into alignment.
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// The magic word can be whatever sequence you like, but each character
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// should be unique, and frequent pixel values like 0 and 255 are
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// avoided -- fewer false positives. The host software will need to
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// generate a compatible header: immediately following the magic word
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// are three bytes: a 16-bit count of the number of LEDs (high byte
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// first) followed by a simple checksum value (high byte XOR low byte
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// XOR 0x55). LED data follows, 3 bytes per LED, in order R, G, B,
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// where 0 = off and 255 = max brightness.
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static const uint8_t magic[] = {
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'A','d','a'};
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#define MAGICSIZE sizeof(magic)
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// Check values are header byte # - 1, as they are indexed from 0
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#define HICHECK (MAGICSIZE)
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#define LOCHECK (MAGICSIZE + 1)
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#define CHECKSUM (MAGICSIZE + 2)
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#define MODE_HEADER 0
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#define MODE_DATA 1
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static uint8_t
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mode = MODE_HEADER;
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static int16_t
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c;
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static uint16_t
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outPos;
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static uint32_t
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bytesRemaining;
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static unsigned long
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t,
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lastByteTime,
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lastAckTime;
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// Debug macros initialized
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#ifdef DEBUG_LED
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#define ON 1
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#define OFF 0
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#define D_LED(x) do {digitalWrite(DEBUG_LED, x);} while(0)
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#else
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#define D_LED(x)
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#endif
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#ifdef DEBUG_FPS
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#define D_FPS do {digitalWrite(DEBUG_FPS, HIGH); digitalWrite(DEBUG_FPS, LOW);} while (0)
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#else
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#define D_FPS
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#endif
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void setup(){
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#ifdef GROUND_PIN
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pinMode(GROUND_PIN, OUTPUT);
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digitalWrite(GROUND_PIN, LOW);
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#endif
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#ifdef DEBUG_LED
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pinMode(DEBUG_LED, OUTPUT);
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digitalWrite(DEBUG_LED, LOW);
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#endif
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#ifdef DEBUG_FPS
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pinMode(DEBUG_FPS, OUTPUT);
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#endif
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FastLED.addLeds<LED_TYPE, Led_Pin, COLOR_ORDER>(leds, Num_Leds);
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FastLED.setBrightness(Brightness);
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#ifdef CLEAR_ON_START
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FastLED.show();
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#endif
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Serial.begin(SerialSpeed);
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Serial.print("Ada\n"); // Send ACK string to host
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lastByteTime = lastAckTime = millis(); // Set initial counters
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}
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void loop(){
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adalight();
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}
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void adalight(){
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t = millis(); // Save current time
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// If there is new serial data
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if((c = Serial.read()) >= 0){
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lastByteTime = lastAckTime = t; // Reset timeout counters
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switch(mode) {
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case MODE_HEADER:
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headerMode();
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break;
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case MODE_DATA:
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dataMode();
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break;
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}
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}
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else {
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// No new data
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timeouts();
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}
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}
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void headerMode(){
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static uint8_t
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headPos,
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hi, lo, chk;
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if(headPos < MAGICSIZE){
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// Check if magic word matches
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if(c == magic[headPos]) {headPos++;}
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else {headPos = 0;}
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}
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else{
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// Magic word matches! Now verify checksum
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switch(headPos){
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case HICHECK:
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hi = c;
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headPos++;
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break;
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case LOCHECK:
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lo = c;
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headPos++;
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break;
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case CHECKSUM:
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chk = c;
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if(chk == (hi ^ lo ^ 0x55)) {
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// Checksum looks valid. Get 16-bit LED count, add 1
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// (# LEDs is always > 0) and multiply by 3 for R,G,B.
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D_LED(ON);
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bytesRemaining = 3L * (256L * (long)hi + (long)lo + 1L);
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outPos = 0;
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memset(leds, 0, Num_Leds * sizeof(struct CRGB));
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mode = MODE_DATA; // Proceed to latch wait mode
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}
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headPos = 0; // Reset header position regardless of checksum result
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break;
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}
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}
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}
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void dataMode(){
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// If LED data is not full
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if (outPos < sizeof(leds)){
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dataSet();
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}
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bytesRemaining--;
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if(bytesRemaining == 0) {
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// End of data -- issue latch:
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mode = MODE_HEADER; // Begin next header search
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FastLED.show();
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D_FPS;
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D_LED(OFF);
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#ifdef SERIAL_FLUSH
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serialFlush();
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#endif
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}
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}
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void dataSet(){
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#ifdef CALIBRATE
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if(outPos < 3)
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ledsRaw[outPos++] = c;
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else{
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ledsRaw[outPos] = ledsRaw[outPos%3]; // Sets RGB data to first LED color
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outPos++;
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}
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#else
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ledsRaw[outPos++] = c; // Issue next byte
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#endif
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}
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void timeouts(){
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// No data received. If this persists, send an ACK packet
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// to host once every second to alert it to our presence.
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if((t - lastAckTime) > 1000) {
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Serial.print("Ada\n"); // Send ACK string to host
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lastAckTime = t; // Reset counter
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// If no data received for an extended time, turn off all LEDs.
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if((t - lastByteTime) > SerialTimeout * 1000) {
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memset(leds, 0, Num_Leds * sizeof(struct CRGB)); //filling Led array by zeroes
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FastLED.show();
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lastByteTime = t; // Reset counter
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}
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}
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}
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void serialFlush(){
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while(Serial.available() > 0) {
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byte r = Serial.read();
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}
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}
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