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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 724 | 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 | |||
| 29 | uint8_t key_state = 0; // debounced and inverted key state: |
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| 30 | // bit = 1: key pressed |
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| 31 | uint8_t key_press = 0; // key press detect |
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| 32 | uint8_t key_rpt; // key long press and repeat |
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| 33 | |||
| 34 | |||
| 35 | //***************************************************************************** |
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| 36 | // |
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| 37 | #if defined (__AVR_ATmega32__) |
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| 38 | ISR(TIMER0_COMP_vect) // Timer-Interrupt (100 Hz) |
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| 39 | #else |
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| 40 | ISR(TIMER0_COMPA_vect) // Timer-Interrupt (100 Hz) |
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| 41 | #endif |
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| 42 | { |
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| 43 | static uint8_t ct0 = 0; |
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| 44 | static uint8_t ct1 = 0; |
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| 45 | static uint8_t rpt = 0; |
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| 46 | uint8_t i; |
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| 47 | |||
| 48 | // Key handling by Peter Dannegger |
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| 49 | // see www.mikrocontroller.net |
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| 50 | i = key_state ^ ~KEY_PIN; // key changed ? |
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| 51 | ct0 = ~(ct0 & i); // reset or count ct0 |
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| 52 | ct1 = ct0 ^ (ct1 & i); // reset or count ct1 |
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| 53 | i &= (ct0 & ct1); // count until roll over ? |
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| 54 | key_state ^= i; // then toggle debounced state |
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| 55 | key_press |= (key_state & i); // 0->1: key press detect |
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| 56 | |||
| 57 | if ((key_state & REPEAT_MASK) == 0) // check repeat function |
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| 58 | { |
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| 59 | rpt = REPEAT_START; // start delay |
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| 60 | } |
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| 61 | if (--rpt == 0) |
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| 62 | { |
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| 63 | rpt = REPEAT_NEXT; // repeat delay |
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| 64 | key_rpt |= (key_state & REPEAT_MASK); |
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| 65 | } |
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| 66 | |||
| 67 | |||
| 68 | if (timer > 0) |
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| 69 | timer --; |
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| 70 | } |
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| 71 | |||
| 72 | |||
| 73 | //***************************************************************************** |
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| 74 | // |
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| 75 | void TIMER0_Init (void) |
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| 76 | { |
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| 77 | timer = 0; |
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| 78 | |||
| 79 | #if defined (__AVR_ATmega32__) |
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| 80 | TCCR0 = (1 << CS02) | (1 << CS00) | (1 << WGM01); // Prescaler 1024 |
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| 81 | OCR0 = (F_CPU / (100L * 1024L)) ; |
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| 82 | |||
| 83 | TIMSK |= (1 << OCIE0); // enable interrupt for OCR |
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| 84 | #else |
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| 85 | TCCR0A = (1 << WGM01); |
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| 86 | TCCR0B = (1 << CS02) | (1 << CS00); |
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| 87 | OCR0A = (F_CPU / (100L * 1024L)) ; |
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| 88 | |||
| 89 | TIMSK0 |= (1 << OCIE0A); // enable interrupt for OCR |
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| 90 | #endif |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 | //***************************************************************************** |
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| 95 | // |
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| 96 | uint8_t get_key_press (uint8_t key_mask) |
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| 97 | { |
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| 98 | uint8_t sreg = SREG; |
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| 99 | |||
| 100 | // disable all interrupts |
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| 101 | cli(); |
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| 102 | |||
| 103 | key_mask &= key_press; // read key(s) |
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| 104 | key_press ^= key_mask; // clear key(s) |
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| 105 | |||
| 106 | SREG = sreg; // restore status register |
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| 107 | |||
| 108 | return key_mask; |
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| 109 | } |
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| 110 | |||
| 111 | |||
| 112 | //***************************************************************************** |
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| 113 | // |
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| 114 | uint8_t get_key_rpt (uint8_t key_mask) |
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| 115 | { |
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| 116 | uint8_t sreg = SREG; |
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| 117 | |||
| 118 | // disable all interrupts |
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| 119 | cli(); |
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| 120 | |||
| 121 | key_mask &= key_rpt; // read key(s) |
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| 122 | key_rpt ^= key_mask; // clear key(s) |
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| 123 | |||
| 124 | SREG = sreg; // restore status register |
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| 125 | |||
| 126 | return key_mask; |
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| 127 | } |
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| 128 | |||
| 129 | |||
| 130 | //***************************************************************************** |
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| 131 | // |
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| 132 | uint8_t get_key_short (uint8_t key_mask) |
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| 133 | { |
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| 134 | uint8_t ret; |
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| 135 | uint8_t sreg = SREG; |
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| 136 | |||
| 137 | // disable all interrupts |
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| 138 | cli(); |
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| 139 | |||
| 140 | ret = get_key_press (~key_state & key_mask); |
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| 141 | |||
| 142 | SREG = sreg; // restore status register |
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| 143 | |||
| 144 | return ret; |
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| 145 | } |
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| 146 | |||
| 147 | |||
| 148 | //***************************************************************************** |
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| 149 | // |
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| 150 | uint8_t get_key_long (uint8_t key_mask) |
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| 151 | { |
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| 152 | return get_key_press (get_key_rpt (key_mask)); |
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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_long2 (uint8_t key_mask) |
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| 159 | { |
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| 160 | return get_key_press (get_key_rpt (key_press^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_long_rpt (uint8_t key_mask) |
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| 167 | { |
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| 168 | return get_key_rpt (~key_press^key_mask); |
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| 169 | } |