author | Tero Marttila <terom@paivola.fi> |
Fri, 30 Jan 2015 14:28:15 +0200 | |
changeset 111 | 530d215d5df1 |
parent 101 | 18c461237630 |
permissions | -rw-r--r-- |
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#include <util/delay.h> |
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// DMX |
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#define DMX_DDR DDRD |
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#define DMX_PORT PORTD |
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#define DMX_DATA 2 |
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// baud rate: 250k = 4µs / bit |
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#define DMX_BAUD (250 * 1000) |
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#define DMX_US 4 |
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// CPU cycles / bit: 64 @ 16Mhz |
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#define DMX_CYCLES (F_CPU / DMX_BAUD) |
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void dmx_init () |
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{ |
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// dmx data out: idle (high) |
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sbi(&DMX_PORT, DMX_DATA); |
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sbi(&DMX_DDR, DMX_DATA); |
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} |
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static inline void dmx_high () |
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{ |
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sbi(&DMX_PORT, DMX_DATA); |
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} |
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static inline void dmx_low () |
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{ |
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cbi(&DMX_PORT, DMX_DATA); |
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} |
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#define dmx_pause(bits) _delay_us((DMX_US * bits)) |
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static void dmx_break () |
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{ |
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// break |
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dmx_low(); |
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dmx_pause(22); |
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// mark-after-break (MAB) |
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dmx_high(); |
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dmx_pause(3); // min 2, recommended 3 |
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} |
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#include "dmx_frame.c" |
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/* |
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* Send out a full DMX packet, including the start-code frame and a frame for each channel given. |
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* |
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* Uses 3-bit mark-times between frames, since some fixtures don't seem happy with 2-bit mark-times. |
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*/ |
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static void dmx_packet (byte count, byte *out) |
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{ |
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dmx_break(); |
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dmx_frame(0); |
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dmx_pause(1); // MTBF 2+1 = 3 |
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for (byte i = 0; i < count; i++) { |
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dmx_frame(out[i]); |
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// MTBF 2+1 = 3 |
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dmx_pause(1); |
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} |
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} |