DMX Arduino

Project: DMX Arduino
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Description	DMX besturing met een arduino
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Een Shield voor de Arduino waarmee je DMX apparatuur kan besturen. Shield is inmiddels geetst.

Schema :

De bijbehorende code :

/*

• DMX fade for arduino 008
• based on the code of Tomek Ness and D. Cuartielles
• adapted to arduino 008 by Peter Szakal and Gabor Papp
• http://nextlab.hu
• /

1. include "pins_arduino.h"

int sig = 11; // signal

int value = 0; int valueadd = 3;

/* Sends a DMX byte out on a pin. Assumes a 16 MHz clock.

• Disables interrupts, which will disrupt the millis() function if used
• too frequently. */

void shiftDmxOut(int pin, int theByte) { int port_to_output[] = { NOT_A_PORT, NOT_A_PORT, _SFR_IO_ADDR(PORTB), _SFR_IO_ADDR(PORTC), _SFR_IO_ADDR(PORTD) };

int portNumber = port_to_output[digitalPinToPort(pin)]; int pinMask = digitalPinToBitMask(pin);

// the first thing we do is to write te pin to high // it will be the mark between bytes. It may be also // high from before _SFR_BYTE(_SFR_IO8(portNumber)) |= pinMask; delayMicroseconds(10);

// disable interrupts, otherwise the timer 0 overflow interrupt that // tracks milliseconds will make us delay longer than we want. cli();

// DMX starts with a start-bit that must always be zero _SFR_BYTE(_SFR_IO8(portNumber)) &= ~pinMask;

// we need a delay of 4us (then one bit is transfered) // this seems more stable then using delayMicroseconds asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n"); asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");

asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n"); asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");

asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n"); asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");

for (int i = 0; i < 8; i++) { if (theByte &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp; 01) { _SFR_BYTE(_SFR_IO8(portNumber)) |= pinMask; } else { _SFR_BYTE(_SFR_IO8(portNumber)) &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;= ~pinMask; }

asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n"); asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");

asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n"); asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");

asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n"); asm("nop\n nop\n nop\n nop\n nop\n nop\n nop\n nop\n");

theByte >>= 1; }

// the last thing we do is to write the pin to high // it will be the mark between bytes. (this break is have to be between 8 us and 1 sec) _SFR_BYTE(_SFR_IO8(portNumber)) |= pinMask;

// reenable interrupts. sei(); }

void setup() { pinMode(sig, OUTPUT); }

void loop() { /***** sending the dmx signal *****/

// sending the break (the break can be between 88us and 1sec) digitalWrite(sig, LOW);

delay(10);

// sending the start byte shiftDmxOut(sig, 0);

for (int count = 1; count < = 512; count++) { shiftDmxOut(sig, value); } /***** sending the dmx signal end *****/

value += valueadd; if ((value == 0) || (value == 255)) { valueadd *= -1; } }

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