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/* Copyright 2020 zvecr<git@zvecr.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 "mcp23018.h"
#include "quantum.h"
// Optimize scanning code for speed as a slight mitigation for the port expander
#pragma GCC push_options
#pragma GCC optimize("-O3")
#define I2C_ADDR 0x20
static uint16_t mcp23018_reset_loop = 0;
static uint8_t mcp23018_errors = 0;
static const pin_t row_pins[MATRIX_ROWS / 2] = {B1, D5, D4, D6, D7, B4};
static const pin_t col_pins[MATRIX_COLS] = {F5, F6, F7, C7, C6, B6, B5, D3, D2, B3, B2};
//_____REGULAR funcs____________________________________________________________
static void select_row(uint8_t row) {
setPinOutput(row_pins[row]);
writePinLow(row_pins[row]);
}
static void unselect_row(uint8_t row) { setPinInputHigh(row_pins[row]); }
static void unselect_rows(void) {
for (uint8_t x = 0; x < MATRIX_ROWS / 2; x++) {
setPinInputHigh(row_pins[x]);
}
}
static void init_pins(void) {
unselect_rows();
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
setPinInputHigh(col_pins[x]);
}
}
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
matrix_row_t current_row_value = 0;
// Select row and wait for row selection to stabilize
select_row(current_row);
wait_us(5);
// For each col...
for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
// Select the col pin to read (active low)
uint8_t pin_state = readPin(col_pins[col_index]);
// Populate the matrix row with the state of the col pin
current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
}
// Unselect row
unselect_row(current_row);
if (last_row_value == current_row_value) {
return false;
}
current_matrix[current_row] = current_row_value;
return true;
}
//_____MCP23018 funcs___________________________________________________________
static void init_pins_MCP23018(void) {
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTA, 0b11111111);
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTB, 0b01100000);
}
static void select_row_MCP23018(uint8_t row) {
uint8_t mask = 0;
switch (row) {
case 6:
mask = 0b10000000;
break;
case 7:
mask = 0b00000001;
break;
case 8:
mask = 0b00000010;
break;
case 9:
mask = 0b00000100;
break;
case 10:
mask = 0b00001000;
break;
case 11:
mask = 0b00010000;
break;
}
mcp23018_errors += !mcp23018_set_output(I2C_ADDR, mcp23018_PORTB, ~mask);
}
static uint16_t read_cols_MCP23018(void) {
uint16_t tmp = 0xFFFF;
mcp23018_errors += !mcp23018_readPins_all(I2C_ADDR, &tmp);
uint16_t state = ((tmp & 0b11111111) << 2) | ((tmp & 0b0110000000000000) >> 13);
return (~state) & 0b1111111111;
}
static bool read_cols_on_row_MCP23018(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];
// No need to Clear data in matrix row as we just replace in one go
// Select row and wait for row selection to stabilize
select_row_MCP23018(current_row);
matrix_row_t current_row_value = read_cols_MCP23018();
// No need to Unselect row as the next `select_row` will blank everything
if (last_row_value == current_row_value) {
return false;
}
current_matrix[current_row] = current_row_value;
return true;
}
//_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
void matrix_init_custom(void) {
mcp23018_init(I2C_ADDR);
init_pins();
init_pins_MCP23018();
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool changed = false;
for (uint8_t current_row = 0; current_row < MATRIX_ROWS / 2; current_row++) {
changed |= read_cols_on_row(current_matrix, current_row);
}
if (mcp23018_errors) {
if (++mcp23018_reset_loop > 0x7FFF) {
// tuned to about 5s given the current scan rate
print("trying to reset mcp23018\n");
mcp23018_reset_loop = 0;
mcp23018_errors = 0;
init_pins_MCP23018();
}
return changed;
}
for (uint8_t current_row = MATRIX_ROWS / 2; current_row < MATRIX_ROWS; current_row++) {
changed |= read_cols_on_row_MCP23018(current_matrix, current_row);
}
return changed;
}
#pragma GCC pop_options
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