qmk-dactyl-manuform-a/keyboards/ergotaco/matrix.c

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/*
Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.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/>.
*/
#include "matrix.h"
#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 QMK_KEYBOARD_H
#ifdef DEBUG_MATRIX_SCAN_RATE
#include "timer.h"
#endif
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
// ATmega pin defs
#define ROW1 (1<<5)
#define COL6 (1<<0)
#define COL7 (1<<1)
#define COL8 (1<<2)
#define COL9 (1<<3)
#define COL10 (1<<2)
#define COL11 (1<<3)
// bit masks
#define BMASK (COL7 | COL8 | COL9 | COL6)
#define DMASK (COL10 | COL11)
#define FMASK (ROW1)
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
/*
* matrix state(1:on, 0:off)
* contains the raw values without debounce filtering of the last read cycle.
*/
static matrix_row_t raw_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;
// static uint16_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;
raw_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(matrix_row_t rawcols, uint8_t row) {
matrix_row_t result = 0;
matrix_row_t change = rawcols ^ raw_matrix[row];
raw_matrix[row] = rawcols;
for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
if (debounce_matrix[row * MATRIX_COLS + i]) {
--debounce_matrix[row * MATRIX_COLS + i];
} else {
result |= (1 << i);
}
if (change & (1 << i)) {
debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE;
}
}
return result;
}
matrix_row_t debounce_read_cols(uint8_t row) {
// Read the row without debouncing filtering and store it for later usage.
matrix_row_t cols = read_cols(row);
// Get the Debounce mask.
matrix_row_t mask = debounce_mask(cols, row);
// debounce the row and return the result.
return (cols & mask) | (matrix[row] & ~mask);;
}
uint8_t matrix_scan(void)
{
// Then the keyboard
if (mcp23018_status) { // if there was an error
if (++mcp23018_reset_loop == 0) {
// if (++mcp23018_reset_loop >= 1300) {
// 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_PER_SIDE; i++) {
select_row(i);
// and select on left hand
select_row(i + MATRIX_ROWS_PER_SIDE);
// we don't need a 30us delay anymore, because selecting a
// left-hand row requires more than 30us for i2c.
// grab cols from left hand
matrix[i] = debounce_read_cols(i);
// grab cols from right hand
matrix[i + MATRIX_ROWS_PER_SIDE] = debounce_read_cols(i + MATRIX_ROWS_PER_SIDE);
unselect_rows();
}
matrix_scan_quantum();
#ifdef DEBUG_MATRIX
for (uint8_t c = 0; c < MATRIX_COLS; c++)
for (uint8_t r = 0; r < MATRIX_ROWS; r++)
if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
#endif
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;
}
// Remember this means ROWS
static void init_cols(void)
{
// init on mcp23018
// not needed, already done as part of init_mcp23018()
// Input with pull-up(DDR:0, PORT:1)
DDRF &= ~FMASK;
PORTF |= FMASK;
}
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, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(GPIOB, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_start(I2C_ADDR_READ, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_read_nack(ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status < 0) goto out;
data = (~((uint8_t)mcp23018_status) >> 2) & 0x01 ;
mcp23018_status = I2C_STATUS_SUCCESS;
out:
i2c_stop();
#ifdef DEBUG_MATRIX
if (data != 0x00) xprintf("I2C: %d\n", data);
#endif
return data;
}
} else {
// Read using bitmask
return ~((((PINF & ROW1) >> 5)) & 0x1);
}
}
// Row pin configuration
static void unselect_rows(void)
{
// no need to unselect on mcp23018, because the select step sets all
// the other row bits high, and it's not changing to a different
// direction
// Hi-Z(DDR:0, PORT:0) to unselect
DDRB &= ~BMASK;
PORTB &= ~BMASK;
DDRD &= ~DMASK;
PORTD &= ~DMASK;
}
static void select_row(uint8_t row)
{
if (row < 6) {
// select on mcp23018
if (mcp23018_status) { // do nothing on error
// Read using bitmask
} else { // set active row low : 0 // set other rows hi-Z : 1
mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(GPIOA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(~(1<<row), ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
out:
i2c_stop();
}
} else {
// Output low(DDR:1, PORT:0) to select
switch (row) {
case 6:
DDRB |= COL6;
PORTB &= ~COL6;
break;
case 7:
DDRB |= COL7;
PORTB &= ~COL7;
break;
case 8:
DDRB |= COL8;
PORTB &= ~COL8;
break;
case 9:
DDRB |= COL9;
PORTB &= ~COL9;
break;
case 10:
DDRD |= COL10;
PORTD &= ~COL10;
break;
case 11:
DDRD |= COL11;
PORTD &= ~COL11;
break;
}
}
}