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/*
Copyright 2012-2019 Jun Wako, Jack Humbert, Yiancar, Mathias Andersson <wraul@dbox.se>
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/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
#include "pca9555.h"
/*
* IC1 (PCA9555) IC2 (PCA9555)
* ,----------. ,----------.
* SDA --| SDA P00 |-- P1 SDA --| SDA P00 |-- P17
* SCL --| SCL P01 |-- P2 SCL --| SCL P01 |-- P18
* INT --| INT P02 |-- P3 INT --| INT P02 |-- P19
* | P03 |-- P4 | P03 |-- P20
* GND --| A0 P04 |-- P5 VCC --| A0 P04 |-- P21
* SJ1 --| A1 P05 |-- P6 SJ1 --| A1 P05 |-- P22
* GND --| A2 P06 |-- P7 GND --| A2 P06 |-- P23
* | P07 |-- P8 | P07 |-- P24
* | | | |
* | P10 |-- P9 | P10 |-- P25
* | P11 |-- P10 | P11 |-- P26
* | P12 |-- P11 | P12 |-- P27
* | P13 |-- P12 | P13 |-- P28
* | P14 |-- P13 | P14 |-- P29
* | P15 |-- P14 | P15 |-- P30
* | P16 |-- P15 | P16 |-- P31
* | P17 |-- P16 | P17 |-- P32
* `----------' `----------'
*/
/*
* | Row | Pin | | Col | Pin |
* | --- | --- | | --- | --- |
* | 0 | P1 | | 0 | P25 |
* | 1 | P2 | | 1 | P26 |
* | 2 | P3 | | 2 | P27 |
* | 3 | P4 | | 3 | P28 |
* | 4 | P5 | | 4 | P29 |
* | 5 | P6 | | 5 | P30 |
* | 6 | P7 | | 6 | P20 |
* | 7 | P8 | | 7 | P21 |
* | 8 | P22 |
* | 9 | P23 |
* | A | P24 |
*/
// PCA9555 slave addresses
#define IC1 0x20
#define IC2 0x21
// PCA9555 column pin masks
#define PORT0_COLS_MASK 0b11111000
#define PORT1_COLS_MASK 0b00111111
#define COLS_MASK 0b0000011111111111
#if (MATRIX_COLS <= 8)
# define print_matrix_header() print("\nr/c 01234567\n")
# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
# define matrix_bitpop(i) bitpop(matrix[i])
# define ROW_SHIFTER ((uint8_t)1)
#elif (MATRIX_COLS <= 16)
# define print_matrix_header() print("\nr/c 0123456789ABCDEF\n")
# define print_matrix_row(row) print_bin_reverse16(matrix_get_row(row))
# define matrix_bitpop(i) bitpop16(matrix[i])
# define ROW_SHIFTER ((uint16_t)1)
#elif (MATRIX_COLS <= 32)
# define print_matrix_header() print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
# define print_matrix_row(row) print_bin_reverse32(matrix_get_row(row))
# define matrix_bitpop(i) bitpop32(matrix[i])
# define ROW_SHIFTER ((uint32_t)1)
#endif
/* matrix state(1:on, 0:off) */
static matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
static matrix_row_t matrix[MATRIX_ROWS]; // debounced values
__attribute__((weak)) void matrix_init_quantum(void) { matrix_init_kb(); }
__attribute__((weak)) void matrix_scan_quantum(void) { matrix_scan_kb(); }
__attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
__attribute__((weak)) void matrix_init_user(void) {}
__attribute__((weak)) void matrix_scan_user(void) {}
inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }
inline uint8_t matrix_cols(void) { return MATRIX_COLS; }
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_matrix_header();
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
phex(row);
print(": ");
print_matrix_row(row);
print("\n");
}
}
uint8_t matrix_key_count(void) {
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
count += matrix_bitpop(i);
}
return count;
}
static void init_i2c(void) {
pca9555_init(IC1);
pca9555_init(IC2);
}
static void init_pins(void) {
// init cols - IC2 port0 & IC2 port1 input
pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);
pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);
// init rows - IC1 port0 output
pca9555_set_config(IC1, PCA9555_PORT0, ALL_OUTPUT);
pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH);
}
static void select_row(uint8_t row) {
// All rows are on the same IC and port
uint8_t mask = 1 << row;
// set active row low : 0
// set other rows hi-Z : 1
pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
}
static uint16_t read_cols(void) {
uint16_t state_1 = pca9555_readPins(IC2, PCA9555_PORT0);
uint16_t state_2 = pca9555_readPins(IC2, PCA9555_PORT1);
uint16_t state = ((state_1 & PORT0_COLS_MASK) << 3) | ((state_2 & PORT1_COLS_MASK));
// A low pin indicates an active column
return (~state) & COLS_MASK;
}
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
// Store last value of row prior to reading
matrix_row_t last_row_value = current_matrix[current_row];
// Clear data in matrix row
current_matrix[current_row] = 0;
// Select row and wait for row selecton to stabilize
select_row(current_row);
wait_us(30);
current_matrix[current_row] |= read_cols();
// No need to unselect as `select_row` sets all the pins.
return (last_row_value != current_matrix[current_row]);
}
void matrix_init(void) {
// initialize i2c
init_i2c();
// initialize key pins
init_pins();
// initialize matrix state: all keys off
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
raw_matrix[i] = 0;
matrix[i] = 0;
}
debounce_init(MATRIX_ROWS);
matrix_init_quantum();
}
uint8_t matrix_scan(void) {
bool changed = false;
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
changed |= read_cols_on_row(raw_matrix, current_row);
}
debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
matrix_scan_quantum();
return (uint8_t)changed;
}
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