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Diffstat (limited to 'keyboards/handwired/dactyl/matrix.c')
| -rw-r--r-- | keyboards/handwired/dactyl/matrix.c | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/keyboards/handwired/dactyl/matrix.c b/keyboards/handwired/dactyl/matrix.c new file mode 100644 index 000000000..0626f93d7 --- /dev/null +++ b/keyboards/handwired/dactyl/matrix.c @@ -0,0 +1,393 @@ +/* + +Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com> +Copyright 2017 Erin Call <hello@erincall.com> + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +/* + * scan matrix + */ +#include <stdint.h> +#include <stdbool.h> +#include <avr/io.h> +#include "wait.h" +#include "action_layer.h" +#include "print.h" +#include "debug.h" +#include "util.h" +#include "matrix.h" +#include "dactyl.h" +#include "i2cmaster.h" +#ifdef DEBUG_MATRIX_SCAN_RATE +#include "timer.h" +#endif + +/* + * This constant define not debouncing time in msecs, but amount of matrix + * scan loops which should be made to get stable debounced results. + * + * On the Dactyl, the matrix scan rate is relatively low, because + * communicating with the left hand's I/O expander is slower than simply + * selecting local pins. + * Now it's only 317 scans/second, or about 3.15 msec/scan. + * According to Cherry specs, debouncing time is 5 msec. + * + * And so, there is no sense to have DEBOUNCE higher than 2. + */ + +#ifndef DEBOUNCE +# define DEBOUNCE 5 +#endif + +/* matrix state(1:on, 0:off) */ +static matrix_row_t matrix[MATRIX_ROWS]; + +// Debouncing: store for each key the number of scans until it's eligible to +// change. When scanning the matrix, ignore any changes in keys that have +// already changed in the last DEBOUNCE scans. +static uint8_t debounce_matrix[MATRIX_ROWS * MATRIX_COLS]; + +static matrix_row_t read_cols(uint8_t row); +static void init_cols(void); +static void unselect_rows(void); +static void select_row(uint8_t row); + +static uint8_t mcp23018_reset_loop; + +#ifdef DEBUG_MATRIX_SCAN_RATE +uint32_t matrix_timer; +uint32_t matrix_scan_count; +#endif + + +__attribute__ ((weak)) +void matrix_init_user(void) {} + +__attribute__ ((weak)) +void matrix_scan_user(void) {} + +__attribute__ ((weak)) +void matrix_init_kb(void) { + matrix_init_user(); +} + +__attribute__ ((weak)) +void matrix_scan_kb(void) { + matrix_scan_user(); +} + +inline +uint8_t matrix_rows(void) +{ + return MATRIX_ROWS; +} + +inline +uint8_t matrix_cols(void) +{ + return MATRIX_COLS; +} + +void matrix_init(void) +{ + // initialize row and col + + mcp23018_status = init_mcp23018(); + + + unselect_rows(); + init_cols(); + + // initialize matrix state: all keys off + for (uint8_t i=0; i < MATRIX_ROWS; i++) { + matrix[i] = 0; + for (uint8_t j=0; j < MATRIX_COLS; ++j) { + debounce_matrix[i * MATRIX_COLS + j] = 0; + } + } + +#ifdef DEBUG_MATRIX_SCAN_RATE + matrix_timer = timer_read32(); + matrix_scan_count = 0; +#endif + + matrix_init_quantum(); + +} + +void matrix_power_up(void) { + mcp23018_status = init_mcp23018(); + + unselect_rows(); + init_cols(); + + // initialize matrix state: all keys off + for (uint8_t i=0; i < MATRIX_ROWS; i++) { + matrix[i] = 0; + } + +#ifdef DEBUG_MATRIX_SCAN_RATE + matrix_timer = timer_read32(); + matrix_scan_count = 0; +#endif +} + +// Returns a matrix_row_t whose bits are set if the corresponding key should be +// eligible to change in this scan. +matrix_row_t debounce_mask(uint8_t row) { + matrix_row_t result = 0; + for (uint8_t j=0; j < MATRIX_COLS; ++j) { + if (debounce_matrix[row * MATRIX_COLS + j]) { + --debounce_matrix[row * MATRIX_COLS + j]; + } else { + result |= (1 << j); + } + } + return result; +} + +// Report changed keys in the given row. Resets the debounce countdowns +// corresponding to each set bit in 'change' to DEBOUNCE. +void debounce_report(matrix_row_t change, uint8_t row) { + for (uint8_t i = 0; i < MATRIX_COLS; ++i) { + if (change & (1 << i)) { + debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE; + } + } +} + +uint8_t matrix_scan(void) +{ + if (mcp23018_status) { // if there was an error + if (++mcp23018_reset_loop == 0) { + // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans + // this will be approx bit more frequent than once per second + print("trying to reset mcp23018\n"); + mcp23018_status = init_mcp23018(); + if (mcp23018_status) { + print("left side not responding\n"); + } else { + print("left side attached\n"); + } + } + } + +#ifdef DEBUG_MATRIX_SCAN_RATE + matrix_scan_count++; + + uint32_t timer_now = timer_read32(); + if (TIMER_DIFF_32(timer_now, matrix_timer)>1000) { + print("matrix scan frequency: "); + pdec(matrix_scan_count); + print("\n"); + + matrix_timer = timer_now; + matrix_scan_count = 0; + } +#endif + + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + select_row(i); + wait_us(30); // without this wait read unstable value. + matrix_row_t mask = debounce_mask(i); + matrix_row_t cols = (read_cols(i) & mask) | (matrix[i] & ~mask); + debounce_report(cols ^ matrix[i], i); + matrix[i] = cols; + + unselect_rows(); + } + + matrix_scan_quantum(); + + return 1; +} + +bool matrix_is_modified(void) // deprecated and evidently not called. +{ + 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++) { + phex(row); print(": "); + pbin_reverse16(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++) { + count += bitpop16(matrix[i]); + } + return count; +} + +/* Column pin configuration + * + * Teensy + * col: 0 1 2 3 4 5 + * pin: F0 F1 F4 F5 F6 F7 + * + * MCP23018 + * col: 0 1 2 3 4 5 + * pin: B5 B4 B3 B2 B1 B0 + */ +static void init_cols(void) +{ + // init on mcp23018 + // not needed, already done as part of init_mcp23018() + + // init on teensy + // Input with pull-up(DDR:0, PORT:1) + DDRF &= ~(1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0); + PORTF |= (1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0); +} + +static matrix_row_t read_cols(uint8_t row) +{ + if (row < 6) { + if (mcp23018_status) { // if there was an error + return 0; + } else { + uint8_t data = 0; + mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out; + mcp23018_status = i2c_write(GPIOB); if (mcp23018_status) goto out; + mcp23018_status = i2c_start(I2C_ADDR_READ); if (mcp23018_status) goto out; + data = i2c_readNak(); + data = ~data; + out: + i2c_stop(); + return data; + } + } else { + // read from teensy + return + (PINF&(1<<0) ? 0 : (1<<0)) | + (PINF&(1<<1) ? 0 : (1<<1)) | + (PINF&(1<<4) ? 0 : (1<<2)) | + (PINF&(1<<5) ? 0 : (1<<3)) | + (PINF&(1<<6) ? 0 : (1<<4)) | + (PINF&(1<<7) ? 0 : (1<<5)) ; + } +} + +/* Row pin configuration + * + * Teensy + * row: 6 7 8 9 10 11 + * pin: B1 B2 B3 D2 D3 C6 + * + * MCP23018 + * row: 0 1 2 3 4 5 + * pin: A0 A1 A2 A3 A4 A5 + */ +static void unselect_rows(void) +{ + // unselect on mcp23018 + if (mcp23018_status) { // if there was an error + // do nothing + } else { + // set all rows hi-Z : 1 + mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out; + mcp23018_status = i2c_write(GPIOA); if (mcp23018_status) goto out; + mcp23018_status = i2c_write(0xFF); if (mcp23018_status) goto out; + out: + i2c_stop(); + } + + // unselect on teensy + // Hi-Z(DDR:0, PORT:0) to unselect + DDRB &= ~(1<<1 | 1<<2 | 1<<3); + PORTB &= ~(1<<1 | 1<<2 | 1<<3); + DDRD &= ~(1<<2 | 1<<3); + PORTD &= ~(1<<2 | 1<<3); + DDRC &= ~(1<<6); + PORTC &= ~(1<<6); +} + +/* Row pin configuration + * + * Teensy + * row: 6 7 8 9 10 11 + * pin: B1 B2 B3 D2 D3 C6 + * + * MCP23018 + * row: 0 1 2 3 4 5 + * pin: A0 A1 A2 A3 A4 A5 + */ +static void select_row(uint8_t row) +{ + if (row < 6) { + // select on mcp23018 + if (mcp23018_status) { // if there was an error + // do nothing + } else { + // set active row low : 0 + // set other rows hi-Z : 1 + mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out; + mcp23018_status = i2c_write(GPIOA); if (mcp23018_status) goto out; + mcp23018_status = i2c_write(0xFF & ~(1<<row)); if (mcp23018_status) goto out; + out: + i2c_stop(); + } + } else { + // select on teensy + // Output low(DDR:1, PORT:0) to select + switch (row) { + case 6: + DDRB |= (1<<1); + PORTB &= ~(1<<1); + break; + case 7: + DDRB |= (1<<2); + PORTB &= ~(1<<2); + break; + case 8: + DDRB |= (1<<3); + PORTB &= ~(1<<3); + break; + case 9: + DDRD |= (1<<2); + PORTD &= ~(1<<3); + break; + case 10: + DDRD |= (1<<3); + PORTD &= ~(1<<3); + break; + case 11: + DDRC |= (1<<6); + PORTC &= ~(1<<6); + break; + } + } +} + |