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Een Shield voor de Arduino waarmee je DMX apparatuur kan besturen. Shield is inmiddels geetst. Schema : [[file:Send_sn75276a.jpgβ]] {| class="wikitable collapsible collapsed" ! De bijbehorende code : |- |<pre> /* * 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 */ #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)) &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;= ~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; } } </pre> |} [[Category:Arduino]]
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