keyboard/hhkb/hhkb_avr.h

   1 #ifndef HHKB_AVR_H
   2 #define HHKB_AVR_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 #if defined(__AVR_ATmega32U4__)
  29 /*
  30  * For TMK HHKB alt controller(ATMega32U4)
  31  *
  32  * row:     PB0-2
  33  * col:     PB3-5,6
  34  * key:     PD7(pull-uped)
  35  * prev:    PB7
  36  * power:   PD4(L:off/H:on)
  37  * row-ext: PC6,7 for HHKB JP(active low)
  38  */
  39 static inline void KEY_ENABLE(void) { (PORTB &= ~(1<<6)); }
  40 static inline void KEY_UNABLE(void) { (PORTB |=  (1<<6)); }
  41 static inline bool KEY_STATE(void) { return (PIND & (1<<7)); }
  42 static inline void KEY_PREV_ON(void) { (PORTB |=  (1<<7)); }
  43 static inline void KEY_PREV_OFF(void) { (PORTB &= ~(1<<7)); }
  44 #ifdef HHKB_POWER_SAVING
  45 static inline void KEY_POWER_ON(void) {
  46     DDRB = 0xFF; PORTB = 0x40;          // change pins output
  47     DDRD |= (1<<4); PORTD |= (1<<4);    // MOS FET switch on
  48     /* Without this wait you will miss or get false key events. */
  49     _delay_ms(5);                       // wait for powering up
  50 }
  51 static inline void KEY_POWER_OFF(void) {
  52     /* input with pull-up consumes less than without it when pin is open. */
  53     DDRB = 0x00; PORTB = 0xFF;          // change pins input with pull-up
  54     DDRD |= (1<<4); PORTD &= ~(1<<4);   // MOS FET switch off
  55 }
  56 static inline bool KEY_POWER_STATE(void) { return PORTD & (1<<4); }
  57 #else
  58 static inline void KEY_POWER_ON(void) {}
  59 static inline void KEY_POWER_OFF(void) {}
  60 static inline bool KEY_POWER_STATE(void) { return true; }
  61 #endif
  62 static inline void KEY_INIT(void)
  63 {
  64     /* row,col,prev: output */
  65     DDRB  = 0xFF;
  66     PORTB = 0x40;   // unable
  67     /* key: input with pull-up */
  68     DDRD  &= ~0x80;
  69     PORTD |=  0x80;
  70 #ifdef HHKB_JP
  71     /* row extention for HHKB JP */
  72     DDRC  |= (1<<6|1<<7);
  73     PORTC |= (1<<6|1<<7);
  74 #else
  75     /* input with pull up to save power */
  76     DDRC  &= ~(1<<6|1<<7);
  77     PORTC |=  (1<<6|1<<7);
  78 #endif
  79     KEY_UNABLE();
  80     KEY_PREV_OFF();
  81
  82     KEY_POWER_OFF();
  83 }
  84 static inline void KEY_SELECT(uint8_t ROW, uint8_t COL)
  85 {
  86     PORTB = (PORTB & 0xC0) | (((COL) & 0x07)<<3) | ((ROW) & 0x07);
  87 #ifdef HHKB_JP
  88     if ((ROW) & 0x08) PORTC = (PORTC & ~(1<<6|1<<7)) | (1<<6);
  89     else              PORTC = (PORTC & ~(1<<6|1<<7)) | (1<<7);
  90 #endif
  91 }
  92
  93
  94 #elif defined(__AVR_AT90USB1286__)
  95 /*
  96  * For Teensy++(AT90USB1286)
  97  *
  98  *                          HHKB pro    HHKB pro2
  99  * row:     PB0-2           (6-8)       (5-7)
 100  * col:     PB3-5,6         (9-12)      (8-11)
 101  * key:     PE6(pull-uped)  (4)         (3)
 102  * prev:    PE7             (5)         (4)
 103  *
 104  * TODO: convert into 'staitc inline' function
 105  */
 106 #define KEY_INIT()              do {    \
 107     DDRB |= 0x7F;                       \
 108     DDRE |=  (1<<7);                    \
 109     DDRE &= ~(1<<6);                    \
 110     PORTE |= (1<<6);                    \
 111 } while (0)
 112 #define KEY_SELECT(ROW, COL)    (PORTB = (PORTB & 0xC0) |       \
 113                                          (((COL) & 0x07)<<3) |  \
 114                                          ((ROW) & 0x07))
 115 #define KEY_ENABLE()            (PORTB &= ~(1<<6))
 116 #define KEY_UNABLE()            (PORTB |=  (1<<6))
 117 #define KEY_STATE()             (PINE & (1<<6))
 118 #define KEY_PREV_ON()           (PORTE |=  (1<<7))
 119 #define KEY_PREV_OFF()          (PORTE &= ~(1<<7))
 120 #define KEY_POWER_ON()
 121 #define KEY_POWER_OFF()
 122 #define KEY_POWER_STATE()       true
 123
 124
 125 #else
 126 #   error "define code for matrix scan"
 127 #endif
 128
 129
 130 #if 0
 131 // For ATMega328P with V-USB
 132 //
 133 // #elif defined(__AVR_ATmega328P__)
 134 // Ports for V-USB
 135 // key:     PB0(pull-uped)
 136 // prev:    PB1
 137 // row:     PB2-4
 138 // col:     PC0-2,3
 139 // power:   PB5(Low:on/Hi-z:off)
 140 #define KEY_INIT()              do {    \
 141     DDRB  |= 0x3E;                      \
 142     DDRB  &= ~(1<<0);                   \
 143     PORTB |= 1<<0;                      \
 144     DDRC  |= 0x0F;                      \
 145     KEY_UNABLE();                       \
 146     KEY_PREV_OFF();                     \
 147 } while (0)
 148 #define KEY_SELECT(ROW, COL)    do {    \
 149     PORTB = (PORTB & 0xE3) | ((ROW) & 0x07)<<2; \
 150     PORTC = (PORTC & 0xF8) | ((COL) & 0x07);    \
 151 } while (0)
 152 #define KEY_ENABLE()            (PORTC &= ~(1<<3))
 153 #define KEY_UNABLE()            (PORTC |=  (1<<3))
 154 #define KEY_STATE()             (PINB & (1<<0))
 155 #define KEY_PREV_ON()           (PORTB |=  (1<<1))
 156 #define KEY_PREV_OFF()          (PORTB &= ~(1<<1))
 157 // Power supply switching
 158 #define KEY_POWER_ON()          do {    \
 159     KEY_INIT();                         \
 160     PORTB &= ~(1<<5);                   \
 161     _delay_ms(1);                       \
 162 } while (0)
 163 #define KEY_POWER_OFF()         do {    \
 164     DDRB  &= ~0x3F;                     \
 165     PORTB &= ~0x3F;                     \
 166     DDRC  &= ~0x0F;                     \
 167     PORTC &= ~0x0F;                     \
 168 } while (0)
 169 #endif
 170
 171 #endif