205 lines
6 KiB
C
205 lines
6 KiB
C
/*
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Copyright 2017-2019 Mathias Andersson <wraul@dbox.se>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include "wait.h"
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#include "debounce.h"
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#include "quantum.h"
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#if (MATRIX_COLS <= 8)
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# define print_matrix_header() print("\nr/c 01234567\n")
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# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
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# define ROW_SHIFTER ((uint8_t)1)
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#elif (MATRIX_COLS <= 16)
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# define print_matrix_header() print("\nr/c 0123456789ABCDEF\n")
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# define print_matrix_row(row) print_bin_reverse16(matrix_get_row(row))
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# define ROW_SHIFTER ((uint16_t)1)
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#elif (MATRIX_COLS <= 32)
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# define print_matrix_header() print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
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# define print_matrix_row(row) print_bin_reverse32(matrix_get_row(row))
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# define ROW_SHIFTER ((uint32_t)1)
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#endif
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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/* matrix state(1:on, 0:off) */
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static matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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static matrix_row_t matrix[MATRIX_ROWS]; // debounced values
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__attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
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__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
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__attribute__((weak)) void matrix_init_user(void) {}
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__attribute__((weak)) void matrix_scan_user(void) {}
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inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }
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inline uint8_t matrix_cols(void) { return MATRIX_COLS; }
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inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
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inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
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void matrix_print(void) {
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print_matrix_header();
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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print_hex8(row);
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print(": ");
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print_matrix_row(row);
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print("\n");
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}
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}
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/* Columns 0 - 15
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* These columns uses two 74HC237D 3 to 8 bit demultiplexers.
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* col / pin: PB6 PC6 PC7 PF1 PF0
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* 0: 0 1 0 0 0
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* 1: 0 1 0 0 1
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* 2: 0 1 0 1 0
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* 3: 0 1 0 1 1
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* 4: 0 1 1 0 0
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* 5: 0 1 1 0 1
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* 6: 0 1 1 1 0
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* 7: 0 1 1 1 1
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* 8: 1 0 0 0 0
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* 9: 1 0 0 0 1
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* 10: 1 0 0 1 0
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* 11: 1 0 0 1 1
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* 12: 1 0 1 0 0
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* 13: 1 0 1 0 1
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* 14: 1 0 1 1 0
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* 15: 1 0 1 1 1
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*
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* col: 16
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* pin: PB5
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*/
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static void unselect_cols(void) {
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for (uint8_t x = 0; x < 6; x++) {
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setPinOutput(col_pins[x]);
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writePinLow(col_pins[x]);
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}
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}
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static void select_col(uint8_t col) {
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if (col < 16) {
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uint8_t c = col + 8;
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writePin(B6, c & 0b10000);
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writePin(C6, c & 0b01000);
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writePin(C7, c & 0b00100);
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writePin(F1, c & 0b00010);
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writePin(F0, c & 0b00001);
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} else {
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writePinHigh(B5);
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}
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}
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/* Row pin configuration
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* row: 0 1 2 3 4 5
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* pin: D0 D1 D2 D3 D5 B7
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*
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* Caps lock uses its own pin E2
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*/
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static void init_pins(void) {
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unselect_cols();
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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setPinInputHigh(row_pins[x]);
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}
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setPinInputHigh(E2);
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}
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
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bool matrix_changed = false;
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// Select col and wait for col selecton to stabilize
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select_col(current_col);
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wait_us(30);
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// For each row...
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for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[row_index];
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// Check row pin state
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// Use the otherwise unused row: 3, col: 0 for caps lock
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if (row_index == 3 && current_col == 0) {
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if (readPin(E2) == 0) {
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// Pin LO, set col bit
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current_matrix[row_index] |= (ROW_SHIFTER << current_col);
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} else {
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// Pin HI, clear col bit
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current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
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}
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} else {
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if (readPin(row_pins[row_index]) == 0) {
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// Pin HI, clear col bit
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current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
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} else {
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// Pin LO, set col bit
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current_matrix[row_index] |= (ROW_SHIFTER << current_col);
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}
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}
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// Determine if the matrix changed state
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if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) {
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matrix_changed = true;
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}
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}
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// Unselect cols
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unselect_cols();
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return matrix_changed;
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}
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void matrix_init(void) {
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// initialize key pins
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init_pins();
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// initialize matrix state: all keys off
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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raw_matrix[i] = 0;
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matrix[i] = 0;
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}
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debounce_init(MATRIX_ROWS);
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matrix_init_kb();
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}
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uint8_t matrix_scan(void) {
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bool changed = false;
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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changed |= read_rows_on_col(raw_matrix, current_col);
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}
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debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
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matrix_scan_kb();
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return (uint8_t)changed;
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}
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