71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
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#ifndef FC660C_H
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#define FC660C_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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// Timer resolution check
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#if (1000000/TIMER_RAW_FREQ > 20)
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# error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
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#endif
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/*
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* HHKB Matrix I/O
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*
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* row: HC4051[A,B,C] selects scan row0-7
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* row-ext: [En0,En1] row extention for JP
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* col: LS145[A,B,C,D] selects scan col0-7 and enable(D)
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* key: on: 0/off: 1
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* prev: hysteresis control: assert(1) when previous key state is on
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*/
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/*
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* Pin configuration for ATMega32U4
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*
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* Row: PD4-6, 7(~EN)
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* Col: PB0-2, 3(Z5 ~EN), 4(Z4 ~EN)
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* Key: PC6(pull-uped)
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* Hys: PC7
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*/
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static inline void KEY_ENABLE(void) { (PORTD &= ~(1<<7)); }
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static inline void KEY_UNABLE(void) { (PORTD |= (1<<7)); }
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static inline bool KEY_STATE(void) { return (PINC & (1<<6)); }
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static inline void KEY_HYS_ON(void) { (PORTC |= (1<<7)); }
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static inline void KEY_HYS_OFF(void) { (PORTC &= ~(1<<7)); }
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static inline void KEY_INIT(void)
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{
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/* Col */
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DDRB |= 0x1F;
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/* Key: input with pull-up */
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DDRC &= ~(1<<6);
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PORTC |= (1<<6);
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/* Hys */
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DDRC |= (1<<7);
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/* Row */
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DDRD |= 0xF0;
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KEY_UNABLE();
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KEY_HYS_OFF();
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}
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static inline void SET_ROW(uint8_t ROW)
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{
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// set row with unabling key
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PORTD = (PORTD & 0x0F) | (1<<7) | ((ROW & 0x07) << 4);
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}
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static inline void SET_COL(uint8_t COL)
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{
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// |PB3(Z5 ~EN)|PB4(Z4 ~EN)
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// --------|-----------|-----------
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// Col:0-7 |high |low
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// Col:8-F |low |high
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PORTB = (PORTB & 0xE0) | ((COL & 0x08) ? 1<<4 : 1<<3) | (COL & 0x07);
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}
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#endif
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