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Diffstat (limited to 'keyboard/phantom/matrix.c')
| -rw-r--r-- | keyboard/phantom/matrix.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/keyboard/phantom/matrix.c b/keyboard/phantom/matrix.c new file mode 100644 index 0000000000..6c3ae49c3a --- /dev/null +++ b/keyboard/phantom/matrix.c @@ -0,0 +1,274 @@ +/* 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[MATRIX_ROWS]; +static matrix_row_t matrix_debouncing[MATRIX_ROWS]; + +static uint8_t read_rows(void); +static void init_rows(void); +static void unselect_cols(void); +static void select_col(uint8_t col); + +#ifndef SLEEP_LED_ENABLE +/* 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 = LED_BRIGHTNESS; // Output compare register 1B + OCR1C = LED_BRIGHTNESS; // Output compare register 1C + // LEDs: LED_A -> PORTB6, LED_B -> PORTB7 + DDRB |= (1<<6) | (1<<7); + PORTB &= ~((1<<6) | (1<<7)); +} +#endif + +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 + unselect_cols(); + init_rows(); +#ifndef SLEEP_LED_ENABLE + setup_leds(); +#endif + + // initialize matrix state: all keys off + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + matrix[i] = 0; + matrix_debouncing[i] = 0; + } +} + +uint8_t matrix_scan(void) +{ + for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16 + select_col(col); + _delay_us(3); // without this wait it won't read stable value. + uint8_t rows = read_rows(); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5 + bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col); + bool curr_bit = rows & (1<<row); + if (prev_bit != curr_bit) { + matrix_debouncing[row] ^= ((matrix_row_t)1<<col); + if (debouncing) { + dprint("bounce!: "); dprintf("%02X", debouncing); dprintln(); + } + debouncing = DEBOUNCE; + } + } + unselect_cols(); + } + + if (debouncing) { + if (--debouncing) { + _delay_ms(1); + } else { + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + matrix[i] = matrix_debouncing[i]; + } + } + } + + return 1; +} + +bool matrix_is_modified(void) +{ + if (debouncing) return false; + return true; +} + +inline +bool matrix_is_on(uint8_t row, uint8_t col) +{ + return (matrix[row] & ((matrix_row_t)1<<col)); +} + +inline +matrix_row_t matrix_get_row(uint8_t row) +{ + return matrix[row]; +} + +void matrix_print(void) +{ + print("\nr/c 0123456789ABCDEF\n"); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row))); + } +} + +uint8_t matrix_key_count(void) +{ + uint8_t count = 0; + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + count += bitpop32(matrix[i]); + } + return count; +} + +/* Row pin configuration + * row: 0 1 2 3 4 5 + * pin: B5 B4 B3 B2 B1 B0 + */ +static void init_rows(void) +{ + // Input with pull-up(DDR:0, PORT:1) + DDRB &= ~0b00111111; + PORTB |= 0b00111111; +} + +static uint8_t read_rows(void) +{ + return (PINB&(1<<5) ? 0 : (1<<0)) | + (PINB&(1<<4) ? 0 : (1<<1)) | + (PINB&(1<<3) ? 0 : (1<<2)) | + (PINB&(1<<2) ? 0 : (1<<3)) | + (PINB&(1<<1) ? 0 : (1<<4)) | + (PINB&(1<<0) ? 0 : (1<<5)); +} + +/* Column pin configuration + * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 + * pin: D5 C7 C6 D4 D0 E6 F0 F1 F4 F5 F6 F7 D7 D6 D1 D2 D3 + */ +static void unselect_cols(void) +{ + // Hi-Z(DDR:0, PORT:0) to unselect + DDRC |= 0b11000000; // PC: 7 6 + PORTC |= 0b11000000; + DDRD |= 0b11111111; // PD: 7 6 5 4 3 2 1 0 + PORTD |= 0b11111111; + DDRE |= 0b01000000; // PE: 6 + PORTE |= 0b01000000; + DDRF |= 0b11110011; // PF: 7 6 5 4 1 0 + PORTF |= 0b11110011; +} + +static void select_col(uint8_t col) +{ + // Output low(DDR:1, PORT:0) to select + switch (col) { + case 0: + DDRD |= (1<<5); + PORTD &= ~(1<<5); + break; + case 1: + DDRC |= (1<<7); + PORTC &= ~(1<<7); + break; + case 2: + DDRC |= (1<<6); + PORTC &= ~(1<<6); + break; + case 3: + DDRD |= (1<<4); + PORTD &= ~(1<<4); + break; + case 4: + DDRD |= (1<<0); + PORTD &= ~(1<<0); + break; + case 5: + DDRE |= (1<<6); + PORTE &= ~(1<<6); + break; + case 6: + DDRF |= (1<<0); + PORTF &= ~(1<<0); + break; + case 7: + DDRF |= (1<<1); + PORTF &= ~(1<<1); + break; + case 8: + DDRF |= (1<<4); + PORTF &= ~(1<<4); + break; + case 9: + DDRF |= (1<<5); + PORTF &= ~(1<<5); + break; + case 10: + DDRF |= (1<<6); + PORTF &= ~(1<<6); + break; + case 11: + DDRF |= (1<<7); + PORTF &= ~(1<<7); + break; + case 12: + DDRD |= (1<<7); + PORTD &= ~(1<<7); + break; + case 13: + DDRD |= (1<<6); + PORTD &= ~(1<<6); + break; + case 14: + DDRD |= (1<<1); + PORTD &= ~(1<<1); + break; + case 15: + DDRD |= (1<<2); + PORTD &= ~(1<<2); + break; + case 16: + DDRD |= (1<<3); + PORTD &= ~(1<<3); + break; + } +} |