author | Tero Marttila <terom@paivola.fi> |
Fri, 11 Apr 2014 19:18:15 +0300 | |
changeset 68 | be139319a961 |
parent 67 | 53743ecc9150 |
child 69 | ef9fe98ebf72 |
permissions | -rw-r--r-- |
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/* |
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* DMX output. |
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* |
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* See doc/dmx.txt for the RX-485 bus protocol details... |
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*/ |
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|
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#include <avr/io.h> |
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|
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#include "stdlib.h" |
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#include "timer.c" |
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#include "serial.c" |
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#include "dmx.c" |
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|
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// debug |
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#define DEBUG_DDR DDRB |
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#define DEBUG_PORT PORTB |
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#define DEBUG_LED 0 |
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|
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void led_init () |
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{ |
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sbi(&DEBUG_DDR, DEBUG_LED); |
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} |
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|
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void led_on () |
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{ |
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sbi(&DEBUG_PORT, DEBUG_LED); |
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} |
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|
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void led_off () |
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{ |
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cbi(&DEBUG_PORT, DEBUG_LED); |
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} |
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|
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void led_toggle () |
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{ |
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xbi(&DEBUG_PORT, DEBUG_LED); |
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} |
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// dmx |
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#define DMX_COUNT 255 |
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/* |
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* DMX state |
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*/ |
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static struct dmx_state { |
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byte out[DMX_COUNT]; |
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byte count; |
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} dmx; |
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enum state { |
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START = '\n', |
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CMD = ';', |
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ARG = ',', |
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ERROR = '!', |
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}; |
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#define CONSOLE_ARGS 8 |
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/* |
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* Console input state. |
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*/ |
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static struct console { |
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byte state; |
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byte cmd; |
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byte argc; |
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byte argv[CONSOLE_ARGS]; |
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} console; |
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/* |
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* Clear output (no state). |
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*/ |
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int cmd_clear () |
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{ |
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dmx.count = 0; |
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return 0; |
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} |
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/* |
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* Set output to given sequence. |
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*/ |
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int cmd_out () |
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{ |
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byte i; |
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for (i = 0; i < console.argc && i < DMX_COUNT; i++) { |
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dmx.out[i] = console.argv[i]; |
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} |
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dmx.count = i; |
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return 0; |
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} |
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/* |
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* Set output at offset. |
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*/ |
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int cmd_set () |
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{ |
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if (console.argc < 1) { |
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return '!'; |
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} |
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if (console.argv[0] == 0) { |
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return '!'; |
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} |
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byte i = console.argv[0] - 1; |
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for (byte a = 1; a < console.argc && i < DMX_COUNT; a++) { |
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dmx.out[i++] = console.argv[a]; |
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} |
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if (i > dmx.count) { |
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dmx.count = i; |
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} |
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return 0; |
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} |
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/* |
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* Set output range to value. |
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*/ |
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int cmd_fill () |
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{ |
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if (console.argc != 4) { |
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return '!'; |
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} |
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byte start = console.argv[0]; |
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byte end = console.argv[1]; |
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byte skip = console.argv[2]; |
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byte value = console.argv[3]; |
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byte c; |
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if (!start) { |
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return '!'; |
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} |
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if (end < start) { |
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return '!'; |
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} |
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if (!skip) { |
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return '!'; |
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} |
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for (c = start; c <= end && c < DMX_COUNT; c += skip) { |
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dmx.out[c - 1] = value; |
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} |
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// XXX: -1 |
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if (c > dmx.count) { |
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dmx.count = c; |
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} |
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return 0; |
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} |
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/* |
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* Set output to max. zeroes |
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*/ |
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int cmd_zero () |
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{ |
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byte count; |
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if (console.argc == 0) { |
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count = DMX_COUNT; |
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} else if (console.argc == 1) { |
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count = console.argv[0]; |
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} else { |
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return '!'; |
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} |
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// set |
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byte i; |
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for (i = 0; i < count; i++) { |
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dmx.out[i] = 0; |
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} |
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dmx.count = i; |
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return 0; |
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} |
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/* |
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* Process console command. |
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*/ |
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int command () |
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{ |
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switch (console.cmd) { |
66 | 191 |
case 'c': return cmd_clear(); |
192 |
case 'o': return cmd_out(); |
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68 | 193 |
case 'f': return cmd_fill(); |
66 | 194 |
case 's': return cmd_set(); |
195 |
case 'z': return cmd_zero(); |
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default: return '?'; |
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} |
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} |
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/* |
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* Process console input. |
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*/ |
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char input (char c) |
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{ |
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// control |
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if (c == '\r') { |
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char ret = '?'; |
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if (console.state == CMD) { |
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console.argc = 0; |
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} else if (console.state == ARG) { |
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console.argc++; |
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} else { |
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console.state = START; |
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return '\n'; |
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} |
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|
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// command |
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if ((ret = command(console.cmd))) { |
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|
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} else { |
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ret = '\n'; |
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} |
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|
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// return to START with response |
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console.state = START; |
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return '\n'; // XXX: required to delimit command reponses.. |
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|
66 | 230 |
} else if (c == ' ' || c == '\t' || c == ',') { |
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// argument |
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if (console.state == CMD) { |
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console.state = ARG; |
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console.argc = 0; |
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console.argv[0] = 0; |
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|
66 | 237 |
return ','; |
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|
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} else if (console.state == ARG) { |
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if (console.argc++ < CONSOLE_ARGS) { |
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console.argv[console.argc] = 0; |
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|
66 | 243 |
return ','; |
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} |
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} |
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246 |
|
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// printable |
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} else if (32 < c && c < 128) { |
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// process input char |
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if (console.state == START) { |
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console.cmd = c; |
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console.state = CMD; |
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|
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return c; |
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255 |
|
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} else if (console.state == ARG) { |
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if (c >= '0' && c <= '9') { |
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console.argv[console.argc] *= 10; |
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console.argv[console.argc] += (c - '0'); |
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|
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return c; |
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} |
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} |
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} else { |
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// ignore |
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return ' '; |
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} |
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268 |
|
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// reject |
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console.state = ERROR; |
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return ERROR; |
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} |
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|
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/* |
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* Tick output state |
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*/ |
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void update () |
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{ |
66 | 279 |
dmx_packet(dmx.count, dmx.out); |
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} |
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|
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void main () |
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{ |
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led_init(); |
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timer_init(); |
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serial_init(); |
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dmx_init(); |
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|
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// mainloop |
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char c = '>'; |
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unsigned timeout = 8000; // 2Hz |
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|
66 | 293 |
// start |
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sei(); |
66 | 295 |
serial_write(c); |
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296 |
|
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while (true) { |
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// sleep |
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//led_on(); |
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if (timer_sleep(timeout)) { |
66 | 301 |
//c = ' '; |
302 |
led_toggle(); |
|
303 |
c = 0; |
|
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|
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} else if ((c = serial_read())) { |
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// got serial data |
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c = input(c); |
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308 |
|
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309 |
} else { |
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// unknown interrupt |
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c = '?'; |
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} |
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//led_off(); |
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|
66 | 315 |
if (c) |
316 |
// respond |
|
317 |
serial_write(c); |
|
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318 |
|
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// output |
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update(); |
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} |
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322 |
} |