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477 | cascade | 1 | /**************************************************************************** |
1866 | - | 2 | * Copyright (C) 2009-2013 by Claas Anders "CaScAdE" Rathje * |
477 | cascade | 3 | * admiralcascade@gmail.com * |
4 | * Project-URL: http://www.mylifesucks.de/oss/c-osd/ * |
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5 | * * |
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6 | * This program is free software; you can redistribute it and/or modify * |
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7 | * it under the terms of the GNU General Public License as published by * |
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8 | * the Free Software Foundation; either version 2 of the License. * |
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9 | * * |
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10 | * This program is distributed in the hope that it will be useful, * |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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13 | * GNU General Public License for more details. * |
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14 | * * |
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15 | * You should have received a copy of the GNU General Public License * |
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16 | * along with this program; if not, write to the * |
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17 | * Free Software Foundation, Inc., * |
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18 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
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19 | ****************************************************************************/ |
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20 | |||
800 | - | 21 | #include "main.h" |
477 | cascade | 22 | #include <avr/io.h> |
23 | #include <avr/interrupt.h> |
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24 | #include "ppm.h" |
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25 | #include "max7456_software_spi.h" // clearing |
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26 | |||
514 | cascade | 27 | #if !(ALLCHARSDEBUG|(WRITECHARS != -1)) |
28 | |||
477 | cascade | 29 | volatile uint16_t old_timer1 = 0, ppm = 0; |
30 | |||
31 | /** |
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32 | * init ppm, including timer1 for measurement |
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33 | */ |
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34 | void ppm_init() { |
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761 | - | 35 | PORTE |= (1 << PORTE0); // enable pullup on INT0 pin |
36 | GICR |= (1 << INT2); // External Interrupt Request 2 Enable |
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37 | EMCUCR |= (1 << ISC2); // a rising edge on INT2 activates the interrupt |
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38 | TCCR1B |= (0 << CS12) | (1 << CS10) | (1 << CS11); // timer1 up with prescaler 64 |
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477 | cascade | 39 | } |
40 | |||
41 | /** |
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42 | * Handle INT2 interrupts that occur on changing edges of ppm signal |
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43 | */ |
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44 | ISR(INT2_vect) { |
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761 | - | 45 | // since the pin might get bogus reads we wait for 123 signals |
46 | static uint8_t valid_ppm_to_go = 123; |
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47 | if (EMCUCR & (1 << ISC2)) { // rising |
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48 | old_timer1 = TCNT1; |
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49 | EMCUCR &= ~(1 << ISC2); // next one is falling |
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50 | } else { |
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51 | if (valid_ppm_to_go) { |
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52 | valid_ppm_to_go--; |
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53 | } else { |
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1951 | - | 54 | if (TCNT1 > old_timer1 + 256) { |
55 | ppm = TCNT1 - old_timer1; |
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56 | ppm -= 256; |
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57 | } else { |
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58 | ppm = 0; |
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59 | } |
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761 | - | 60 | if (ppm < 128) { // we want HUD |
61 | if (!(COSD_FLAGS_MODES & COSD_FLAG_HUD)) { |
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62 | COSD_FLAGS_RUNTIME &= ~COSD_ICONS_WRITTEN; |
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63 | } |
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64 | COSD_FLAGS_MODES |= COSD_FLAG_HUD; |
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65 | } else { // we do not want hud |
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66 | COSD_FLAGS_MODES &= ~COSD_FLAG_HUD; |
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67 | } |
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68 | } |
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69 | EMCUCR |= (1 << ISC2); // next one is rising |
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70 | } |
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71 | //write_ndigit_number_u(2, 6, valid_ppm_to_go, 100, 0); // debug |
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72 | //write_ndigit_number_u(2, 7, COSD_FLAGS_CONFIG, 100, 0); // debug |
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1771 | - | 73 | //PORTC ^= (1 << PC3); // LED4_TOGGLE // debug |
800 | - | 74 | //uptime = ppm; |
477 | cascade | 75 | } |
514 | cascade | 76 | |
77 | #endif |