qmk_firmware/keyboards/ergodox_ez/matrix.c
James Churchill 37932c293c Next set of split_common changes (#4974)
* Update split_common to use standard i2c drivers

* Eliminate RGB_DIRTY/BACKLIT_DIRTY

* Fix avr i2c_master error handling

* Fix i2c_slave addressing

* Remove unneeded timeout on i2c_stop()

* Fix RGB I2C transfers

* Remove incorrect comment
2019-03-12 10:23:28 -07:00

401 lines
10 KiB
C

/*
Note for ErgoDox EZ customizers: Here be dragons!
This is not a file you want to be messing with.
All of the interesting stuff for you is under keymaps/ :)
Love, Erez
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/>.
*/
/*
* 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 QMK_KEYBOARD_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 Ergodox matrix scan rate is relatively low, because of slow I2C.
* Now it's only 317 scans/second, or about 3.15 msec/scan.
* According to Cherry specs, debouncing time is 5 msec.
*
* However, some switches seem to have higher debouncing requirements, or
* something else might be wrong. (Also, the scan speed has improved since
* that comment was written.)
*/
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
/* 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)
{
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");
ergodox_blink_all_leds();
}
}
}
#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
#ifdef LEFT_LEDS
mcp23018_status = ergodox_left_leds_update();
#endif // LEFT_LEDS
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();
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 < 7) {
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);
mcp23018_status = I2C_STATUS_SUCCESS;
out:
i2c_stop();
return data;
}
} else {
/* read from teensy
* bitmask is 0b11110011, but we want those all
* in the lower six bits.
* we'll return 1s for the top two, but that's harmless.
*/
return ~((PINF & 0x03) | ((PINF & 0xF0) >> 2));
}
}
/* Row pin configuration
*
* Teensy
* row: 7 8 9 10 11 12 13
* pin: B0 B1 B2 B3 D2 D3 C6
*
* MCP23018
* row: 0 1 2 3 4 5 6
* pin: A0 A1 A2 A3 A4 A5 A6
*/
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
// unselect on teensy
// Hi-Z(DDR:0, PORT:0) to unselect
DDRB &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
PORTB &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
DDRD &= ~(1<<2 | 1<<3);
PORTD &= ~(1<<2 | 1<<3);
DDRC &= ~(1<<6);
PORTC &= ~(1<<6);
}
static void select_row(uint8_t row)
{
if (row < 7) {
// 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, 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(0xFF & ~(1<<row), ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
out:
i2c_stop();
}
} else {
// select on teensy
// Output low(DDR:1, PORT:0) to select
switch (row) {
case 7:
DDRB |= (1<<0);
PORTB &= ~(1<<0);
break;
case 8:
DDRB |= (1<<1);
PORTB &= ~(1<<1);
break;
case 9:
DDRB |= (1<<2);
PORTB &= ~(1<<2);
break;
case 10:
DDRB |= (1<<3);
PORTB &= ~(1<<3);
break;
case 11:
DDRD |= (1<<2);
PORTD &= ~(1<<2);
break;
case 12:
DDRD |= (1<<3);
PORTD &= ~(1<<3);
break;
case 13:
DDRC |= (1<<6);
PORTC &= ~(1<<6);
break;
}
}
}