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Diffstat (limited to 'keyboard/phantom/matrix.c')
| -rw-r--r-- | keyboard/phantom/matrix.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/keyboard/phantom/matrix.c b/keyboard/phantom/matrix.c new file mode 100644 index 000000000..07f3f4289 --- /dev/null +++ b/keyboard/phantom/matrix.c @@ -0,0 +1,249 @@ +/* Copyright 2012 Jun Wako <wakojun@gmail.com> + * + * This is heavily based on phantom/board.{c|h}. + * https://github.com/BathroomEpiphanies/AVR-Keyboard + * + * Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc + * http://bathroomepiphanies.com + * + * As for liscensing consult with the original files or its author. + */ +#include <stdint.h> +#include <stdbool.h> +#include <avr/io.h> +#include <util/delay.h> +#include "print.h" +#include "debug.h" +#include "util.h" +#include "matrix.h" + + +#ifndef DEBOUNCE +# define DEBOUNCE 0 +#endif +static uint8_t debouncing = DEBOUNCE; + +// bit array of key state(1:on, 0:off) +static matrix_row_t *matrix; +static matrix_row_t *matrix_debounced; +static matrix_row_t _matrix0[MATRIX_ROWS]; +static matrix_row_t _matrix1[MATRIX_ROWS]; + + +#define _DDRA (uint8_t *const)&DDRA +#define _DDRB (uint8_t *const)&DDRB +#define _DDRC (uint8_t *const)&DDRC +#define _DDRD (uint8_t *const)&DDRD +#define _DDRE (uint8_t *const)&DDRE +#define _DDRF (uint8_t *const)&DDRF + +#define _PINA (uint8_t *const)&PINA +#define _PINB (uint8_t *const)&PINB +#define _PINC (uint8_t *const)&PINC +#define _PIND (uint8_t *const)&PIND +#define _PINE (uint8_t *const)&PINE +#define _PINF (uint8_t *const)&PINF + +#define _PORTA (uint8_t *const)&PORTA +#define _PORTB (uint8_t *const)&PORTB +#define _PORTC (uint8_t *const)&PORTC +#define _PORTD (uint8_t *const)&PORTD +#define _PORTE (uint8_t *const)&PORTE +#define _PORTF (uint8_t *const)&PORTF + +#define _BIT0 0x01 +#define _BIT1 0x02 +#define _BIT2 0x04 +#define _BIT3 0x08 +#define _BIT4 0x10 +#define _BIT5 0x20 +#define _BIT6 0x40 +#define _BIT7 0x80 + +/* Specifies the ports and pin numbers for the rows */ +static +uint8_t *const row_ddr[MATRIX_ROWS] = {_DDRB, _DDRB, _DDRB, _DDRB, _DDRB, _DDRB}; + +static +uint8_t *const row_port[MATRIX_ROWS] = {_PORTB, _PORTB, _PORTB, _PORTB, _PORTB, _PORTB}; + +static +uint8_t *const row_pin[MATRIX_ROWS] = {_PINB, _PINB, _PINB, _PINB, _PINB, _PINB}; + +static +const uint8_t row_bit[MATRIX_ROWS] = { _BIT0, _BIT1, _BIT2, _BIT3, _BIT4, _BIT5}; + +/* Specifies the ports and pin numbers for the columns */ +static +uint8_t *const col_ddr[MATRIX_COLS] = { _DDRD, _DDRC, _DDRC, _DDRD, _DDRD, _DDRE, + _DDRF, _DDRF, _DDRF, _DDRF, _DDRF, _DDRF, + _DDRD, _DDRD, _DDRD, _DDRD, _DDRD}; + +static +uint8_t *const col_port[MATRIX_COLS] = {_PORTD, _PORTC, _PORTC, _PORTD, _PORTD, _PORTE, + _PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF, + _PORTD, _PORTD, _PORTD, _PORTD, _PORTD}; + +static +const uint8_t col_bit[MATRIX_COLS] = { _BIT5, _BIT7, _BIT6, _BIT4, _BIT0, _BIT6, + _BIT0, _BIT1, _BIT4, _BIT5, _BIT6, _BIT7, + _BIT7, _BIT6, _BIT1, _BIT2, _BIT3}; + +static +inline void pull_column(int col) { + *col_port[col] &= ~col_bit[col]; +} + +static +inline void release_column(int col) { + *col_port[col] |= col_bit[col]; +} + +/* PORTB is set as input with pull-up resistors + PORTC,D,E,F are set to high output */ + +static +void setup_io_pins(void) { + uint8_t row, col; + for(row = 0; row < MATRIX_ROWS; row++) { + *row_ddr[row] &= ~row_bit[row]; + *row_port[row] |= row_bit[row]; + } + for(col = 0; col < MATRIX_COLS; col++) { + *col_ddr[col] |= col_bit[col]; + *col_port[col] |= col_bit[col]; + } +} + +/* LEDs are on output compare pins OC1B OC1C + This activates fast PWM mode on them. + Prescaler 256 and 8-bit counter results in + 16000000/256/256 = 244 Hz blink frequency. + LED_A: Caps Lock + LED_B: Scroll Lock */ +/* Output on PWM pins are turned off when the timer + reaches the value in the output compare register, + and are turned on when it reaches TOP (=256). */ +static +void setup_leds(void) { + TCCR1A |= // Timer control register 1A + (1<<WGM10) | // Fast PWM 8-bit + (1<<COM1B1)| // Clear OC1B on match, set at TOP + (1<<COM1C1); // Clear OC1C on match, set at TOP + TCCR1B |= // Timer control register 1B + (1<<WGM12) | // Fast PWM 8-bit + (1<<CS12); // Prescaler 256 + OCR1B = 250; // Output compare register 1B + OCR1C = 250; // Output compare register 1C + // LEDs: LED_A -> PORTB6, LED_B -> PORTB7 + DDRB &= 0x3F; + PORTB &= 0x3F; +} + + +inline +uint8_t matrix_rows(void) +{ + return MATRIX_ROWS; +} + +inline +uint8_t matrix_cols(void) +{ + return MATRIX_COLS; +} + +void matrix_init(void) +{ + // To use PORTF disable JTAG with writing JTD bit twice within four cycles. + MCUCR |= (1<<JTD); + MCUCR |= (1<<JTD); + + // initialize row and col + setup_io_pins(); + setup_leds(); + + // initialize matrix state: all keys off + for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00; + for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00; + matrix = _matrix0; + matrix_debounced = _matrix1; +} + +uint8_t matrix_scan(void) +{ + if (!debouncing) { + matrix_row_t *tmp = matrix_debounced; + matrix_debounced = matrix; + matrix = tmp; + } + + for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16 + pull_column(col); // output hi on theline + _delay_us(3); // without this wait it won't read stable value. + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5 + bool prev_bit = matrix[row] & ((matrix_row_t)1<<col); + bool curr_bit = !(*row_pin[row] & row_bit[row]); + if (prev_bit != curr_bit) { + matrix[row] ^= ((matrix_row_t)1<<col); + if (debouncing) { + debug("bounce!: "); debug_hex(debouncing); print("\n"); + } + debouncing = DEBOUNCE; + } + } + release_column(col); + } + + if (debouncing) { + debouncing--; + } + + return 1; +} + +bool matrix_is_modified(void) +{ + // NOTE: no longer used + return true; +} + +inline +bool matrix_has_ghost(void) +{ + return false; +} + +inline +bool matrix_is_on(uint8_t row, uint8_t col) +{ + return (matrix_debounced[row] & ((matrix_row_t)1<<col)); +} + +inline +matrix_row_t matrix_get_row(uint8_t row) +{ + return matrix_debounced[row]; +} + +void matrix_print(void) +{ + print("\nr/c 01234567\n"); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + phex(row); print(": "); + pbin_reverse(matrix_get_row(row)); + print("\n"); + } +} + +uint8_t matrix_key_count(void) +{ + uint8_t count = 0; + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + for (uint8_t j = 0; j < MATRIX_COLS; j++) { + if (matrix_is_on(i, j)) + count++; + } + } + return count; +} |