David Madison
GitHub
commit
f3d194292d
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@ -4,7 +4,7 @@
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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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* Last Updated: 2017-03-27
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* Last Updated: 2017-04-08
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*/
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// --- General Settings
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@ -52,10 +52,14 @@ uint8_t * ledsRaw = (uint8_t *)leds;
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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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#define HEADERSIZE (MAGICSIZE + 3)
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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 2
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#define MODE_DATA 1
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void setup(){
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#ifdef GROUND_PIN
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@ -76,26 +80,16 @@ void setup(){
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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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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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headPos,
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hi, lo, chk;
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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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uint32_t
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bytesRemaining;
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unsigned long
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lastByteTime,
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lastAckTime,
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@ -113,11 +107,69 @@ void adalight(){
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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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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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if(headPos < MAGICSIZE){
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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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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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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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break;
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case MODE_DATA:
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if(bytesRemaining > 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++] = 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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bytesRemaining--;
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}
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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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}
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break;
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} // end switch
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} // end serial if
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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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@ -131,66 +183,7 @@ void adalight(){
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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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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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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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}
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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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indexOut++;
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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 else
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} // end for(;;)
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}
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