David Madison
GitHub
commit
672f401a4d
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@ -9,9 +9,9 @@
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// --- General Settings
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static const uint8_t
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Num_Leds = 80, // strip length
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Led_Pin = 6, // Arduino data output pin
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Brightness = 255; // maximum brightness
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Num_Leds = 80, // strip length
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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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@ -21,7 +21,7 @@ static const uint8_t
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static const unsigned long
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SerialSpeed = 115200, // serial port speed, max available
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SerialTimeout = 150000; // time before LEDs are shut off, if no data
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// (150 seconds)
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// (150 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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@ -38,19 +38,19 @@ 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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// 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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// 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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// 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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'A','d','a'};
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#define MAGICSIZE sizeof(magic)
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#define HEADERSIZE (MAGICSIZE + 3)
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@ -58,143 +58,144 @@ static const uint8_t magic[] = {
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#define MODE_DATA 2
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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 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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FastLED.addLeds<LED_TYPE, Led_Pin, COLOR_ORDER>(leds, Num_Leds);
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FastLED.setBrightness(Brightness);
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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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#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.begin(SerialSpeed);
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adalight();
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adalight();
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}
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void adalight(){
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// Dirty trick: the circular buffer for serial data is 256 bytes,
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// and the "in" and "out" indices are unsigned 8-bit types -- this
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// much simplifies the cases where in/out need to "wrap around" the
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// beginning/end of the buffer. Otherwise there'd be a ton of bit-
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// masking and/or conditional code every time one of these indices
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// needs to change, slowing things down tremendously.
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// Dirty trick: the circular buffer for serial data is 256 bytes,
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// and the "in" and "out" indices are unsigned 8-bit types -- this
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// much simplifies the cases where in/out need to "wrap around" the
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// beginning/end of the buffer. Otherwise there'd be a ton of bit-
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// masking and/or conditional code every time one of these indices
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// needs to change, slowing things down tremendously.
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uint8_t
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buffer[256],
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indexIn = 0,
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indexOut = 0,
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mode = MODE_HEADER,
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hi, lo, chk, i;
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int16_t
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c;
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uint16_t
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bytesBuffered = 0;
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uint32_t
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bytesRemaining,
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outPos;
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unsigned long
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lastByteTime,
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lastAckTime,
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t;
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uint8_t
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buffer[256],
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indexIn = 0,
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indexOut = 0,
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mode = MODE_HEADER,
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hi, lo, chk, i;
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int16_t
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c;
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uint16_t
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bytesBuffered = 0;
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uint32_t
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bytesRemaining,
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outPos;
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unsigned long
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lastByteTime,
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lastAckTime,
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t;
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Serial.print("Ada\n"); // Send ACK string to host
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Serial.print("Ada\n"); // Send ACK string to host
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lastByteTime = lastAckTime = millis();
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lastByteTime = lastAckTime = millis();
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// loop() is avoided as even that small bit of function overhead
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// has a measurable impact on this code's overall throughput.
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// loop() is avoided as even that small bit of function overhead
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// has a measurable impact on this code's overall throughput.
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for(;;) {
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for(;;) {
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// Implementation is a simple finite-state machine.
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// Regardless of mode, check for serial input each time:
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t = millis();
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if((bytesBuffered < 256) && ((c = Serial.read()) >= 0)) {
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buffer[indexIn++] = c;
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bytesBuffered++;
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lastByteTime = lastAckTime = t; // Reset timeout counters
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}
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else {
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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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}
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// If no data received for an extended time, turn off all LEDs.
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if((t - lastByteTime) > SerialTimeout) {
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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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// Implementation is a simple finite-state machine.
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// Regardless of mode, check for serial input each time:
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t = millis();
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if((bytesBuffered < 256) && ((c = Serial.read()) >= 0)) {
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buffer[indexIn++] = c;
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bytesBuffered++;
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lastByteTime = lastAckTime = t; // Reset timeout counters
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}
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else {
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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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}
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// If no data received for an extended time, turn off all LEDs.
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if((t - lastByteTime) > SerialTimeout) {
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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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switch(mode) {
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switch(mode) {
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case MODE_HEADER:
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case MODE_HEADER:
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// In header-seeking mode. Is there enough data to check?
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if(bytesBuffered >= HEADERSIZE) {
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// Indeed. Check for a 'magic word' match.
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for(i=0; (i<MAGICSIZE) && (buffer[indexOut++] == magic[i++]););
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if(i == MAGICSIZE) {
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// Magic word matches. Now how about the checksum?
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hi = buffer[indexOut++];
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lo = buffer[indexOut++];
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chk = buffer[indexOut++];
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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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bytesRemaining = 3L * (256L * (long)hi + (long)lo + 1L);
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bytesBuffered -= 3;
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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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else {
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// Checksum didn't match; search resumes after magic word.
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indexOut -= 3; // Rewind
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}
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} // else no header match. Resume at first mismatched byte.
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bytesBuffered -= i;
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}
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break;
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// In header-seeking mode. Is there enough data to check?
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if(bytesBuffered >= HEADERSIZE) {
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// Indeed. Check for a 'magic word' match.
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for(i=0; (i<MAGICSIZE) && (buffer[indexOut++] == magic[i++]););
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if(i == MAGICSIZE) {
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// Magic word matches. Now how about the checksum?
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hi = buffer[indexOut++];
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lo = buffer[indexOut++];
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chk = buffer[indexOut++];
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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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bytesRemaining = 3L * (256L * (long)hi + (long)lo + 1L);
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bytesBuffered -= 3;
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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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else {
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// Checksum didn't match; search resumes after magic word.
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indexOut -= 3; // Rewind
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}
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} // else no header match. Resume at first mismatched byte.
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bytesBuffered -= i;
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}
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break;
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case MODE_DATA:
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case MODE_DATA:
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if(bytesRemaining > 0) {
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if(bytesBuffered > 0) {
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if (outPos < sizeof(leds)){
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#ifdef CALIBRATE
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if(outPos < 3)
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ledsRaw[outPos++] = buffer[indexOut++];
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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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indexOut++;
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}
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#else
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ledsRaw[outPos++] = buffer[indexOut++]; // Issue next byte
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#endif
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}
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bytesBuffered--;
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bytesRemaining--;
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}
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}
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else {
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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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}
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} // end switch
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} // end for(;;)
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if(bytesRemaining > 0) {
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if(bytesBuffered > 0) {
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if (outPos < sizeof(leds)){
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#ifdef CALIBRATE
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if(outPos < 3)
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ledsRaw[outPos++] = buffer[indexOut++];
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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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indexOut++;
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}
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#else
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ledsRaw[outPos++] = buffer[indexOut++]; // Issue next byte
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#endif
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}
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bytesBuffered--;
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bytesRemaining--;
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}
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}
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else {
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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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}
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} // end switch
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} // end for(;;)
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}
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void loop()
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{
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// Not used. See note in adalight() function.
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// loop() is avoided as even that small bit of function overhead
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// has a measurable impact on this code's overall throughput.
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}
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