author | Tero Marttila <terom@paivola.fi> |
Fri, 11 Apr 2014 20:46:25 +0300 | |
changeset 72 | 2957be8573b9 |
parent 62 | 2d68a76322cb |
permissions | -rw-r--r-- |
62
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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/* |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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* Per-frame timing-critical bit-banging. |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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* |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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* Shamelessly stolen from |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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* http://code.google.com/p/tinkerit/source/browse/trunk/DmxSimple/DmxSimple.cpp |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
parents:
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* |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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* Copyright (c) 2008-2009 Peter Knight, Tinker.it! |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
parents:
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* |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
parents:
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* Consumes approx. 11 * 64 ~= 705 clock cycles |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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* Leaves the line idle (high) on return. |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
parents:
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*/ |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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void dmx_frame (volatile byte value) |
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{ |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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uint8_t bitCount, delCount; |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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__asm__ volatile ( |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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"cli\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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"ld __tmp_reg__,%a[dmxPort]\n" |
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"and __tmp_reg__,%[outMask]\n" |
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"st %a[dmxPort],__tmp_reg__\n" |
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"ldi %[bitCount],11\n" // 11 bit intervals per transmitted byte |
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"rjmp bitLoop%=\n" // Delay 2 clock cycles. |
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"bitLoop%=:\n"\ |
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"ldi %[delCount],%[delCountVal]\n" |
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"delLoop%=:\n" |
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"nop\n" |
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"dec %[delCount]\n" |
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"brne delLoop%=\n" |
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"ld __tmp_reg__,%a[dmxPort]\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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"and __tmp_reg__,%[outMask]\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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"sec\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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"ror %[value]\n" |
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"brcc sendzero%=\n" |
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"or __tmp_reg__,%[outBit]\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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"sendzero%=:\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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"st %a[dmxPort],__tmp_reg__\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
parents:
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"dec %[bitCount]\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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"brne bitLoop%=\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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"sei\n" |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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: |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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[bitCount] "=&d" (bitCount), |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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[delCount] "=&d" (delCount) |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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: |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
Tero Marttila <terom@paivola.fi>
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[dmxPort] "e" (&DMX_PORT), |
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hello-dmx: working basic dmx output using DmxSimple's frame-timing inline assembler code
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[outMask] "r" (~(1 << DMX_DATA)), |
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[outBit] "r" ((1 << DMX_DATA)), |
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[delCountVal] "M" (F_CPU/1000000-3), |
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[value] "r" (value) |
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); |
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} |