203 lines
6.1 KiB
C
203 lines
6.1 KiB
C
/*
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Copyright 2012-2019 Jun Wako, Jack Humbert, Yiancar, 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 "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 "pca9555.h"
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/*
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* IC1 (PCA9555) IC2 (PCA9555)
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* ,----------. ,----------.
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* SDA --| SDA P00 |-- P1 SDA --| SDA P00 |-- P17
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* SCL --| SCL P01 |-- P2 SCL --| SCL P01 |-- P18
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* INT --| INT P02 |-- P3 INT --| INT P02 |-- P19
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* | P03 |-- P4 | P03 |-- P20
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* GND --| A0 P04 |-- P5 VCC --| A0 P04 |-- P21
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* SJ1 --| A1 P05 |-- P6 SJ1 --| A1 P05 |-- P22
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* GND --| A2 P06 |-- P7 GND --| A2 P06 |-- P23
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* | P07 |-- P8 | P07 |-- P24
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* | | | |
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* | P10 |-- P9 | P10 |-- P25
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* | P11 |-- P10 | P11 |-- P26
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* | P12 |-- P11 | P12 |-- P27
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* | P13 |-- P12 | P13 |-- P28
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* | P14 |-- P13 | P14 |-- P29
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* | P15 |-- P14 | P15 |-- P30
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* | P16 |-- P15 | P16 |-- P31
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* | P17 |-- P16 | P17 |-- P32
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* `----------' `----------'
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*/
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/*
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* | Row | Pin | | Col | Pin |
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* | --- | --- | | --- | --- |
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* | 0 | P1 | | 0 | P25 |
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* | 1 | P2 | | 1 | P26 |
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* | 2 | P3 | | 2 | P27 |
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* | 3 | P4 | | 3 | P28 |
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* | 4 | P5 | | 4 | P29 |
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* | 5 | P6 | | 5 | P30 |
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* | 6 | P7 | | 6 | P20 |
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* | 7 | P8 | | 7 | P21 |
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* | 8 | P22 |
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* | 9 | P23 |
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* | A | P24 |
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*/
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// PCA9555 slave addresses
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#define IC1 0x20
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#define IC2 0x21
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// PCA9555 column pin masks
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#define PORT0_COLS_MASK 0b11111000
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#define PORT1_COLS_MASK 0b00111111
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#define COLS_MASK 0b0000011111111111
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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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/* 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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static void init_i2c(void) {
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pca9555_init(IC1);
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pca9555_init(IC2);
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}
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static void init_pins(void) {
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// init cols - IC2 port0 & IC2 port1 input
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pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);
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pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);
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// init rows - IC1 port0 output
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pca9555_set_config(IC1, PCA9555_PORT0, ALL_OUTPUT);
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pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH);
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}
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static void select_row(uint8_t row) {
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// All rows are on the same IC and port
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uint8_t mask = 1 << row;
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// set active row low : 0
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// set other rows hi-Z : 1
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pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
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}
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static uint16_t read_cols(void) {
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uint8_t state_1 = 0;
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uint8_t state_2 = 0;
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pca9555_read_pins(IC2, PCA9555_PORT0, &state_1);
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pca9555_read_pins(IC2, PCA9555_PORT1, &state_2);
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uint16_t state = (((uint16_t)state_1 & PORT0_COLS_MASK) << 3) | (((uint16_t)state_2 & PORT1_COLS_MASK));
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// A low pin indicates an active column
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return (~state) & COLS_MASK;
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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// Select row and wait for row selecton to stabilize
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select_row(current_row);
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wait_us(30);
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current_matrix[current_row] |= read_cols();
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// No need to unselect as `select_row` sets all the pins.
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return (last_row_value != current_matrix[current_row]);
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}
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void matrix_init(void) {
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// initialize i2c
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init_i2c();
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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_row = 0; current_row < MATRIX_ROWS; current_row++) {
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changed |= read_cols_on_row(raw_matrix, current_row);
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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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