134 lines
3 KiB
C++
134 lines
3 KiB
C++
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/*
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* DMX fade for arduino 008
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* based on the code of Tomek Ness and D. Cuartielles
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*
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* adapted to arduino 008 by Peter Szakal and Gabor Papp
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* http://nextlab.hu
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*/
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#include "pins_arduino.h"
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#include "WProgram.h"
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void shiftDmxOut(int pin, int theByte);
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void setup();
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void loop();
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int sig = 8; // signal
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int value = 0;
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int valueadd = 3;
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/* Sends a DMX byte out on a pin. Assumes a 16 MHz clock.
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* Disables interrupts, which will disrupt the millis() function if used
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* too frequently. */
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void shiftDmxOut(int pin, int theByte)
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{
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int port_to_output[] = {
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NOT_A_PORT,
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NOT_A_PORT,
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_SFR_IO_ADDR(PORTB),
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_SFR_IO_ADDR(PORTC),
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_SFR_IO_ADDR(PORTD)
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};
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int portNumber = port_to_output[digitalPinToPort(pin)];
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int pinMask = digitalPinToBitMask(pin);
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// the first thing we do is to write te pin to high
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// it will be the mark between bytes. It may be also
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// high from before
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_SFR_BYTE(_SFR_IO8(portNumber)) |= pinMask;
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delayMicroseconds(10);
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// disable interrupts, otherwise the timer 0 overflow interrupt that
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// tracks milliseconds will make us delay longer than we want.
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cli();
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// DMX starts with a start-bit that must always be zero
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_SFR_BYTE(_SFR_IO8(portNumber)) &= ~pinMask;
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// we need a delay of 4us (then one bit is transfered)
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// this seems more stable then using delayMicroseconds
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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for (int i = 0; i < 8; i++)
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{
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if (theByte & 01)
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{
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_SFR_BYTE(_SFR_IO8(portNumber)) |= pinMask;
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}
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else
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{
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_SFR_BYTE(_SFR_IO8(portNumber)) &= ~pinMask;
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}
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");
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theByte >>= 1;
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}
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// the last thing we do is to write the pin to high
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// it will be the mark between bytes. (this break is have to be between 8 us and 1 sec)
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_SFR_BYTE(_SFR_IO8(portNumber)) |= pinMask;
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// reenable interrupts.
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sei();
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}
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void setup()
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{
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pinMode(sig, OUTPUT);
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}
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void loop()
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{
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/***** sending the dmx signal *****/
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// sending the break (the break can be between 88us and 1sec)
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digitalWrite(sig, LOW);
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delay(10);
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// sending the start byte
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shiftDmxOut(sig, 0);
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for (int count = 1; count <= 512; count++)
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{
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shiftDmxOut(sig, value);
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}
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/***** sending the dmx signal end *****/
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value += valueadd;
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if ((value == 0) || (value == 255))
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{
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valueadd *= -1;
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}
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}
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int main(void)
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{
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init();
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setup();
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for (;;)
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loop();
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return 0;
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}
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