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/*
Copyright 2012 Jun Wako <wakojun@gmail.com>
Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
Copyright 2015 ZSA Technology Labs Inc (@zsa)
Copyright 2020 Christopher Courtney <drashna@live.com> (@drashna)
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 "debounce.h"
#include "ergodox_ez.h"
/*
* This constant define not debouncing time in msecs, assuming eager_pr.
*
* 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.)
*/
/* matrix state(1:on, 0:off) */
extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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;
void matrix_init_custom(void) {
// initialize row and col
mcp23018_status = init_mcp23018();
unselect_rows();
init_cols();
}
// Reads and stores a row, returning
// whether a change occurred.
static inline bool store_raw_matrix_row(uint8_t index) {
matrix_row_t temp = read_cols(index);
if (raw_matrix[index] != temp) {
raw_matrix[index] = temp;
return true;
}
return false;
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
if (mcp23018_status) { // if there was an error
if (++mcp23018_reset_loop == 0) {
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 RGB_MATRIX_ENABLE
rgb_matrix_init(); // re-init driver on reconnect
#endif
}
}
}
#ifdef LEFT_LEDS
mcp23018_status = ergodox_left_leds_update();
#endif // LEFT_LEDS
bool changed = false;
for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
// select rows from left and right hands
uint8_t left_index = i;
uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
select_row(left_index);
select_row(right_index);
changed |= store_raw_matrix_row(left_index);
changed |= store_raw_matrix_row(right_index);
unselect_rows();
}
return changed;
}
/* 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
setPinInputHigh(F0);
setPinInputHigh(F1);
setPinInputHigh(F4);
setPinInputHigh(F5);
setPinInputHigh(F6);
setPinInputHigh(F7);
}
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;
// reading GPIOB (column port) since in mcp23018's sequential mode
// it is addressed directly after writing to GPIOA in select_row()
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
setPinInput(B0);
setPinInput(B1);
setPinInput(B2);
setPinInput(B3);
setPinInput(D2);
setPinInput(D3);
setPinInput(C6);
}
static void select_row(uint8_t row) {
if (row < 7) {
// select on mcp23018
if (!mcp23018_status) {
// 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:
setPinOutput(B0);
writePinLow(B0);
break;
case 8:
setPinOutput(B1);
writePinLow(B1);
break;
case 9:
setPinOutput(B2);
writePinLow(B2);
break;
case 10:
setPinOutput(B3);
writePinLow(B3);
break;
case 11:
setPinOutput(D2);
writePinLow(D2);
break;
case 12:
setPinOutput(D3);
writePinLow(D3);
break;
case 13:
setPinOutput(C6);
writePinLow(C6);
break;
}
}
}
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