mirror of
https://github.com/sjlongland/atinysynth.git
synced 2025-09-25 18:03:32 +10:00
Stuart Longland
aa3771dc78
This works by relying on a resistor ladder that is part-shorted-out by a button to Vcc. The ADC detects the button pressed from the voltage seen on the ADC. There's some work to be done on this yet.
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*!
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* Polyphonic synthesizer for microcontrollers: Atmel ATTiny85 port.
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* (C) 2016 Stuart Longland
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <stdint.h>
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/*! Number of keys defined */
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#define ADCKBD_NUM_KEYS (4)
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/*! Bit mask: key (n) pressed */
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#define ADCKBD_PRESSED(n) (1 << (n))
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/*! Bit mask: all keys */
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#define ADCKBD_ALL ((1 << (ADCKBD_NUM_KEYS)) - 1)
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/*! Bit mask: keys released */
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#define ADCKBD_RELEASED (1 << 6)
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/*! Bit mask: change detected */
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#define ADCKBD_CHANGED (1 << 7)
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/*! Initialisation routine */
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void adckbd_init();
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/*!
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* Last known keyboard state
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*/
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extern uint8_t adckbd_last;
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/*!
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* Current keyboard state
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*/
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extern uint8_t adckbd_now;
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/*!
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* Differences from last
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*/
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extern uint8_t adckbd_diff;
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