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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 730 | woggle | 1 | /***************************************************************************** |
| 2 | * Copyright (C) 2009 Peter "woggle" Mack, mac@denich.net * |
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| 3 | * based on the key handling by Peter Dannegger * |
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| 4 | * see www.mikrocontroller.net * |
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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 | *****************************************************************************/ |
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| 21 | |||
| 22 | #include <avr/io.h> |
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| 23 | #include <avr/interrupt.h> |
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| 24 | #include "main.h" |
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| 25 | #include "timer.h" |
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| 26 | |||
| 27 | volatile uint16_t timer; |
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| 28 | volatile uint16_t abo_timer; |
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| 29 | |||
| 30 | uint8_t key_state = 0; // debounced and inverted key state: |
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| 31 | // bit = 1: key pressed |
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| 32 | uint8_t key_press = 0; // key press detect |
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| 33 | uint8_t key_rpt; // key long press and repeat |
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| 34 | |||
| 35 | |||
| 36 | //***************************************************************************** |
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| 37 | // |
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| 38 | #if defined (__AVR_ATmega32__) |
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| 39 | ISR(TIMER0_COMP_vect) // Timer-Interrupt (100 Hz) |
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| 40 | #else |
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| 41 | ISR(TIMER0_COMPA_vect) // Timer-Interrupt (100 Hz) |
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| 42 | #endif |
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| 43 | { |
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| 44 | static uint8_t ct0 = 0; |
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| 45 | static uint8_t ct1 = 0; |
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| 46 | static uint8_t rpt = 0; |
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| 47 | uint8_t i; |
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| 48 | |||
| 49 | // Key handling by Peter Dannegger |
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| 50 | // see www.mikrocontroller.net |
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| 51 | i = key_state ^ ~KEY_PIN; // key changed ? |
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| 52 | ct0 = ~(ct0 & i); // reset or count ct0 |
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| 53 | ct1 = ct0 ^ (ct1 & i); // reset or count ct1 |
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| 54 | i &= (ct0 & ct1); // count until roll over ? |
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| 55 | key_state ^= i; // then toggle debounced state |
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| 56 | key_press |= (key_state & i); // 0->1: key press detect |
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| 57 | |||
| 58 | if ((key_state & REPEAT_MASK) == 0) // check repeat function |
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| 59 | { |
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| 60 | rpt = REPEAT_START; // start delay |
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| 61 | } |
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| 62 | if (--rpt == 0) |
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| 63 | { |
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| 64 | rpt = REPEAT_NEXT; // repeat delay |
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| 65 | key_rpt |= (key_state & REPEAT_MASK); |
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| 66 | } |
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| 67 | |||
| 68 | |||
| 69 | if (timer > 0) |
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| 70 | { |
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| 71 | timer --; |
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| 72 | } |
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| 73 | |||
| 74 | if (abo_timer > 0) |
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| 75 | { |
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| 76 | abo_timer --; |
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| 77 | } |
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| 78 | } |
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| 79 | |||
| 80 | |||
| 81 | //***************************************************************************** |
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| 82 | // |
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| 83 | void TIMER0_Init (void) |
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| 84 | { |
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| 85 | timer = 0; |
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| 86 | |||
| 87 | #if defined (__AVR_ATmega32__) |
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| 88 | TCCR0 = (1 << CS02) | (1 << CS00) | (1 << WGM01); // Prescaler 1024 |
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| 89 | OCR0 = (F_CPU / (100L * 1024L)) ; |
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| 90 | |||
| 91 | TIMSK |= (1 << OCIE0); // enable interrupt for OCR |
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| 92 | #else |
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| 93 | TCCR0A = (1 << WGM01); |
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| 94 | TCCR0B = (1 << CS02) | (1 << CS00); |
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| 95 | OCR0A = (F_CPU / (100L * 1024L)) ; |
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| 96 | |||
| 97 | TIMSK0 |= (1 << OCIE0A); // enable interrupt for OCR |
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| 98 | #endif |
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| 99 | } |
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| 100 | |||
| 101 | |||
| 102 | //***************************************************************************** |
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| 103 | // |
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| 104 | uint8_t get_key_press (uint8_t key_mask) |
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| 105 | { |
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| 106 | uint8_t sreg = SREG; |
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| 107 | |||
| 108 | // disable all interrupts |
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| 109 | cli(); |
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| 110 | |||
| 111 | key_mask &= key_press; // read key(s) |
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| 112 | key_press ^= key_mask; // clear key(s) |
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| 113 | |||
| 114 | SREG = sreg; // restore status register |
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| 115 | |||
| 116 | return key_mask; |
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| 117 | } |
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| 118 | |||
| 119 | |||
| 120 | //***************************************************************************** |
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| 121 | // |
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| 122 | uint8_t get_key_rpt (uint8_t key_mask) |
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| 123 | { |
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| 124 | uint8_t sreg = SREG; |
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| 125 | |||
| 126 | // disable all interrupts |
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| 127 | cli(); |
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| 128 | |||
| 129 | key_mask &= key_rpt; // read key(s) |
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| 130 | key_rpt ^= key_mask; // clear key(s) |
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| 131 | |||
| 132 | SREG = sreg; // restore status register |
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| 133 | |||
| 134 | return key_mask; |
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| 135 | } |
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| 136 | |||
| 137 | |||
| 138 | //***************************************************************************** |
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| 139 | // |
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| 140 | uint8_t get_key_short (uint8_t key_mask) |
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| 141 | { |
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| 142 | uint8_t ret; |
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| 143 | uint8_t sreg = SREG; |
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| 144 | |||
| 145 | // disable all interrupts |
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| 146 | cli(); |
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| 147 | |||
| 148 | ret = get_key_press (~key_state & key_mask); |
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| 149 | |||
| 150 | SREG = sreg; // restore status register |
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| 151 | |||
| 152 | return ret; |
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| 153 | } |
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| 154 | |||
| 155 | |||
| 156 | //***************************************************************************** |
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| 157 | // |
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| 158 | uint8_t get_key_long (uint8_t key_mask) |
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| 159 | { |
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| 160 | return get_key_press (get_key_rpt (key_mask)); |
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| 161 | } |
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| 162 | |||
| 163 | |||
| 164 | //***************************************************************************** |
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| 165 | // |
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| 166 | uint8_t get_key_long2 (uint8_t key_mask) |
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| 167 | { |
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| 168 | return get_key_press (get_key_rpt (key_press^key_mask)); |
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| 169 | } |
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| 170 | |||
| 171 | |||
| 172 | //***************************************************************************** |
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| 173 | // |
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| 174 | uint8_t get_key_long_rpt (uint8_t key_mask) |
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| 175 | { |
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| 176 | return get_key_rpt (~key_press^key_mask); |
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| 177 | } |