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178 lines
5.3 KiB
178 lines
5.3 KiB
/* Copyright 2020 zvecr<git@zvecr.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mcp23018.h"
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#include "quantum.h"
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// Optimize scanning code for speed as a slight mitigation for the port expander
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#pragma GCC push_options
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#pragma GCC optimize("-O3")
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#define I2C_ADDR 0x20
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static uint16_t mcp23018_reset_loop = 0;
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static uint8_t mcp23018_errors = 0;
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static const pin_t row_pins[MATRIX_ROWS / 2] = {B1, D5, D4, D6, D7, B4};
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static const pin_t col_pins[MATRIX_COLS] = {F5, F6, F7, C7, C6, B6, B5, D3, D2, B3, B2};
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//_____REGULAR funcs____________________________________________________________
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static void select_row(uint8_t row) {
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setPinOutput(row_pins[row]);
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writePinLow(row_pins[row]);
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}
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static void unselect_row(uint8_t row) { setPinInputHigh(row_pins[row]); }
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static void unselect_rows(void) {
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for (uint8_t x = 0; x < MATRIX_ROWS / 2; x++) {
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setPinInputHigh(row_pins[x]);
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}
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}
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static void init_pins(void) {
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unselect_rows();
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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setPinInputHigh(col_pins[x]);
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}
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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matrix_row_t current_row_value = 0;
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// Select row and wait for row selection to stabilize
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select_row(current_row);
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wait_us(5);
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// For each col...
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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// Select the col pin to read (active low)
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uint8_t pin_state = readPin(col_pins[col_index]);
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// Populate the matrix row with the state of the col pin
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current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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// Unselect row
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unselect_row(current_row);
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if (last_row_value == current_row_value) {
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return false;
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}
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current_matrix[current_row] = current_row_value;
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return true;
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}
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//_____MCP23018 funcs___________________________________________________________
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static void init_pins_MCP23018(void) {
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mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTA, 0b11111111);
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mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTB, 0b01100000);
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}
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static void select_row_MCP23018(uint8_t row) {
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uint8_t mask = 0;
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switch (row) {
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case 6:
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mask = 0b10000000;
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break;
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case 7:
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mask = 0b00000001;
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break;
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case 8:
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mask = 0b00000010;
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break;
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case 9:
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mask = 0b00000100;
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break;
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case 10:
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mask = 0b00001000;
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break;
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case 11:
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mask = 0b00010000;
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break;
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}
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mcp23018_errors += !mcp23018_set_output(I2C_ADDR, mcp23018_PORTB, ~mask);
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}
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static uint16_t read_cols_MCP23018(void) {
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uint16_t tmp = 0xFFFF;
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mcp23018_errors += !mcp23018_read_pins_all(I2C_ADDR, &tmp);
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uint16_t state = ((tmp & 0b11111111) << 2) | ((tmp & 0b0110000000000000) >> 13);
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return (~state) & 0b1111111111;
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}
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static bool read_cols_on_row_MCP23018(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// No need to Clear data in matrix row as we just replace in one go
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// Select row and wait for row selection to stabilize
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select_row_MCP23018(current_row);
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matrix_row_t current_row_value = read_cols_MCP23018();
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// No need to Unselect row as the next `select_row` will blank everything
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if (last_row_value == current_row_value) {
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return false;
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}
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current_matrix[current_row] = current_row_value;
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return true;
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}
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//_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
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void matrix_init_custom(void) {
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mcp23018_init(I2C_ADDR);
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init_pins();
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init_pins_MCP23018();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS / 2; current_row++) {
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changed |= read_cols_on_row(current_matrix, current_row);
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}
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if (mcp23018_errors) {
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if (++mcp23018_reset_loop > 0x7FFF) {
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// tuned to about 5s given the current scan rate
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print("trying to reset mcp23018\n");
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mcp23018_reset_loop = 0;
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mcp23018_errors = 0;
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init_pins_MCP23018();
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}
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return changed;
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}
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for (uint8_t current_row = MATRIX_ROWS / 2; current_row < MATRIX_ROWS; current_row++) {
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changed |= read_cols_on_row_MCP23018(current_matrix, current_row);
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}
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return changed;
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}
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#pragma GCC pop_options
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