keyboard/fc660c/fc660c.h

   1 #ifndef FC660C_H
   2 #define FC660C_H
   3
   4 #include <stdint.h>
   5 #include <stdbool.h>
   6 #include <avr/io.h>
   7 #include <avr/interrupt.h>
   8 #include <util/delay.h>
   9
  10
  11 // Timer resolution check
  12 #if (1000000/TIMER_RAW_FREQ > 20)
  13 #   error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
  14 #endif
  15
  16
  17 /*
  18  * HHKB Matrix I/O
  19  *
  20  * row:     HC4051[A,B,C]  selects scan row0-7
  21  * row-ext: [En0,En1] row extention for JP
  22  * col:     LS145[A,B,C,D] selects scan col0-7 and enable(D)
  23  * key:     on: 0/off: 1
  24  * prev:    hysteresis control: assert(1) when previous key state is on
  25  */
  26
  27
  28 /*
  29  * Pin configuration for ATMega32U4
  30  *
  31  * Row:     PD4-6, 7(~EN)
  32  * Col:     PB0-2, 3(Z5 ~EN), 4(Z4 ~EN)
  33  * Key:     PC6(pull-uped)
  34  * Hys:     PC7
  35  */
  36 static inline void KEY_ENABLE(void) { (PORTD &= ~(1<<7)); }
  37 static inline void KEY_UNABLE(void) { (PORTD |=  (1<<7)); }
  38 static inline bool KEY_STATE(void) { return (PINC & (1<<6)); }
  39 static inline void KEY_HYS_ON(void) { (PORTC |=  (1<<7)); }
  40 static inline void KEY_HYS_OFF(void) { (PORTC &= ~(1<<7)); }
  41 static inline void KEY_INIT(void)
  42 {
  43     /* Col */
  44     DDRB  |=  0x1F;
  45     /* Key: input with pull-up */
  46     DDRC  &= ~(1<<6);
  47     PORTC |=  (1<<6);
  48     /* Hys */
  49     DDRC  |=  (1<<7);
  50     /* Row */
  51     DDRD  |=  0xF0;
  52
  53     KEY_UNABLE();
  54     KEY_HYS_OFF();
  55 }
  56 static inline void SET_ROW(uint8_t ROW)
  57 {
  58     // set row with unabling key
  59     PORTD = (PORTD & 0x0F) | (1<<7) | ((ROW & 0x07) << 4);
  60 }
  61 static inline void SET_COL(uint8_t COL)
  62 {
  63     //         |PB3(Z5 ~EN)|PB4(Z4 ~EN)
  64     // --------|-----------|-----------
  65     // Col:0-7 |high       |low
  66     // Col:8-F |low        |high
  67     PORTB = (PORTB & 0xE0) | ((COL & 0x08) ? 1<<4 : 1<<3) | (COL & 0x07);
  68 }
  69
  70 #endif