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+// Arduino "bridge" code between host computer and WS2801-based digital
+// RGB LED pixels (e.g. Adafruit product ID #322). Intended for use
+// with USB-native boards such as Teensy or Adafruit 32u4 Breakout;
+// works on normal serial Arduinos, but throughput is severely limited.
+// LED data is streamed, not buffered, making this suitable for larger
+// installations (e.g. video wall, etc.) than could otherwise be held
+// in the Arduino's limited RAM.
+
+// Some effort is put into avoiding buffer underruns (where the output
+// side becomes starved of data). The WS2801 latch protocol, being
+// delay-based, could be inadvertently triggered if the USB bus or CPU
+// is swamped with other tasks. This code buffers incoming serial data
+// and introduces intentional pauses if there's a threat of the buffer
+// draining prematurely. The cost of this complexity is somewhat
+// reduced throughput, the gain is that most visual glitches are
+// avoided (though ultimately a function of the load on the USB bus and
+// host CPU, and out of our control).
+
+// LED data and clock lines are connected to the Arduino's SPI output.
+// On traditional Arduino boards, SPI data out is digital pin 11 and
+// clock is digital pin 13. On both Teensy and the 32u4 Breakout,
+// data out is pin B2, clock is B1. LEDs should be externally
+// powered -- trying to run any more than just a few off the Arduino's
+// 5V line is generally a Bad Idea. LED ground should also be
+// connected to Arduino ground.
+
+// --------------------------------------------------------------------
+// This file is part of Adalight.
+
+// Adalight is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+
+// Adalight is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+
+// You should have received a copy of the GNU Lesser General Public
+// License along with Adalight. If not, see
+// .
+// --------------------------------------------------------------------
+
+#include
+
+// LED pin for Adafruit 32u4 Breakout Board:
+//#define LED_DDR DDRE
+//#define LED_PORT PORTE
+//#define LED_PIN _BV(PORTE6)
+// LED pin for Teensy:
+//#define LED_DDR DDRD
+//#define LED_PORT PORTD
+//#define LED_PIN _BV(PORTD6)
+// LED pin for Arduino:
+#define LED_DDR DDRB
+#define LED_PORT PORTB
+#define LED_PIN _BV(PORTB5)
+
+// A 'magic word' (along with LED count & checksum) precedes each block
+// of LED data; this assists the microcontroller in syncing up with the
+// host-side software and properly issuing the latch (host I/O is
+// likely buffered, making usleep() unreliable for latch). You may see
+// an initial glitchy frame or two until the two come into alignment.
+// The magic word can be whatever sequence you like, but each character
+// should be unique, and frequent pixel values like 0 and 255 are
+// avoided -- fewer false positives. The host software will need to
+// generate a compatible header: immediately following the magic word
+// are three bytes: a 16-bit count of the number of LEDs (high byte
+// first) followed by a simple checksum value (high byte XOR low byte
+// XOR 0x55). LED data follows, 3 bytes per LED, in order R, G, B,
+// where 0 = off and 255 = max brightness.
+
+static const uint8_t magic[] = {'A','d','a'};
+#define MAGICSIZE sizeof(magic)
+#define HEADERSIZE (MAGICSIZE + 3)
+
+#define MODE_HEADER 0
+#define MODE_HOLD 1
+#define MODE_DATA 2
+
+#define DATA_LED A5
+#define SPI_LED A3
+
+// If no serial data is received for a while, the LEDs are shut off
+// automatically. This avoids the annoying "stuck pixel" look when
+// quitting LED display programs on the host computer.
+static const unsigned long serialTimeout = 15000; // 15 seconds
+
+void setup()
+{
+ // Dirty trick: the circular buffer for serial data is 256 bytes,
+ // and the "in" and "out" indices are unsigned 8-bit types -- this
+ // much simplifies the cases where in/out need to "wrap around" the
+ // beginning/end of the buffer. Otherwise there'd be a ton of bit-
+ // masking and/or conditional code every time one of these indices
+ // needs to change, slowing things down tremendously.
+ uint8_t
+ buffer[256],
+ indexIn = 0,
+ indexOut = 0,
+ mode = MODE_HEADER,
+ hi, lo, chk, i, spiFlag;
+ int16_t
+ bytesBuffered = 0,
+ hold = 0,
+ c;
+ int32_t
+ bytesRemaining;
+ unsigned long
+ startTime,
+ lastByteTime,
+ lastAckTime,
+ t;
+ bool
+ data_in_led = false,
+ spi_out_led = false;
+
+ LED_DDR |= LED_PIN; // Enable output for LED
+ LED_PORT &= ~LED_PIN; // LED off
+ pinMode(DATA_LED, OUTPUT); //data in led
+ pinMode(SPI_LED, OUTPUT); //data out led
+
+ Serial.begin(115200); // Teensy/32u4 disregards baud rate; is OK!
+
+ SPI.begin();
+ SPI.setBitOrder(MSBFIRST);
+ SPI.setDataMode(SPI_MODE0);
+ SPI.setClockDivider(SPI_CLOCK_DIV16); // 1 MHz max, else flicker
+
+ // Issue test pattern to LEDs on startup. This helps verify that
+ // wiring between the Arduino and LEDs is correct. Not knowing the
+ // actual number of LEDs connected, this sets all of them (well, up
+ // to the first 25,000, so as not to be TOO time consuming) to red,
+ // green, blue, then off. Once you're confident everything is working
+ // end-to-end, it's OK to comment this out and reprogram the Arduino.
+ uint8_t testcolor[] = { 0, 0, 0, 255, 0, 0 };
+ for(int i=0; i<5; i++){
+ for(SPDR = 0x00; !(SPSR & _BV(SPIF)); );
+ }
+ for(char n=3; n>=0; n--) {
+ for(c=0; c<25000; c++) {
+ for(i=0; i<3; i++) {
+ for(SPDR = testcolor[n + i]; !(SPSR & _BV(SPIF)); );
+ }
+ for(i=0; i<1; i++) {
+ for(SPDR = 0xFF; !(SPSR & _BV(SPIF)); );
+ }
+ }
+ for(int i=0; i<16; i++){
+ for(SPDR = 0x00; !(SPSR & _BV(SPIF)); );
+ }
+ delay(1); // One millisecond pause = latch
+ digitalWrite(SPI_LED, spi_out_led = !spi_out_led);
+ }
+
+ Serial.print("Ada\n"); // Send ACK string to host
+
+ startTime = micros();
+ lastByteTime = lastAckTime = millis();
+
+ // loop() is avoided as even that small bit of function overhead
+ // has a measurable impact on this code's overall throughput.
+
+ for(;;) {
+ digitalWrite(DATA_LED, LOW);
+ digitalWrite(SPI_LED, LOW);
+ // Implementation is a simple finite-state machine.
+ // Regardless of mode, check for serial input each time:
+ t = millis();
+ if((bytesBuffered < 256) && ((c = Serial.read()) >= 0)) {
+ buffer[indexIn++] = c;
+ bytesBuffered++;
+ lastByteTime = lastAckTime = t; // Reset timeout counters
+ } else {
+ // No data received. If this persists, send an ACK packet
+ // to host once every second to alert it to our presence.
+ if((t - lastAckTime) > 1000) {
+ Serial.print("Ada\n"); // Send ACK string to host
+ lastAckTime = t; // Reset counter
+ }
+ // If no data received for an extended time, turn off all LEDs.
+ if((t - lastByteTime) > serialTimeout) {
+ for(c=0; c<25000; c++) {
+ for(i=0; i<3; i++) {
+ for(SPDR = 0x00; !(SPSR & _BV(SPIF)); );
+ }
+ for(i=0; i<1; i++) {
+ for(SPDR = 0xFF; !(SPSR & _BV(SPIF)); );
+ }
+ }
+ delay(1); // One millisecond pause = latch
+ lastByteTime = t; // Reset counter
+ }
+ }
+
+ switch(mode) {
+
+ case MODE_HEADER:
+
+ // In header-seeking mode. Is there enough data to check?
+ if(bytesBuffered >= HEADERSIZE) {
+ // Indeed. Check for a 'magic word' match.
+ for(i=0; (i 0) and multiply by 3 for R,G,B.
+ bytesRemaining = 4L * (256L * (long)hi + (long)lo) +4L + (256L *(long)hi + (long)lo +15)/16;
+ bytesBuffered -= 3;
+ spiFlag = 0; // No data out yet
+ mode = MODE_HOLD; // Proceed to latch wait mode
+ digitalWrite(DATA_LED, data_in_led = !data_in_led);
+ } else {
+ // Checksum didn't match; search resumes after magic word.
+ indexOut -= 3; // Rewind
+ }
+ } // else no header match. Resume at first mismatched byte.
+ bytesBuffered -= i;
+ }
+ break;
+
+ case MODE_HOLD:
+
+ // Ostensibly "waiting for the latch from the prior frame
+ // to complete" mode, but may also revert to this mode when
+ // underrun prevention necessitates a delay.
+
+ if((micros() - startTime) < hold) break; // Still holding; keep buffering
+
+ // Latch/delay complete. Advance to data-issuing mode...
+ LED_PORT &= ~LED_PIN; // LED off
+ mode = MODE_DATA; // ...and fall through (no break):
+
+ case MODE_DATA:
+ digitalWrite(SPI_LED, spi_out_led = !spi_out_led);
+ while(spiFlag && !(SPSR & _BV(SPIF))); // Wait for prior byte
+ if(bytesRemaining > 0) {
+ if(bytesBuffered > 0) {
+ SPDR = buffer[indexOut++]; // Issue next byte
+ bytesBuffered--;
+ bytesRemaining--;
+ spiFlag = 1;
+ }
+ // If serial buffer is threatening to underrun, start
+ // introducing progressively longer pauses to allow more
+ // data to arrive (up to a point).
+ // if((bytesBuffered < 32) && (bytesRemaining > bytesBuffered)) {
+ // startTime = micros();
+ // hold = 100 + (32 - bytesBuffered) * 10;
+ // mode = MODE_HOLD;
+//}
+ } else {
+ // End of data -- issue latch:
+ startTime = micros();
+ hold = 1000; // Latch duration = 1000 uS
+ LED_PORT |= LED_PIN; // LED on
+ mode = MODE_HEADER; // Begin next header search
+ }
+ } // end switch
+ } // end for(;;)
+}
+
+void loop()
+{
+ // Not used. See note in setup() function.
+}