Add SN74x138 demultiplexer driver (#16217)
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65
drivers/gpio/sn74x138.c
Normal file
65
drivers/gpio/sn74x138.c
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@ -0,0 +1,65 @@
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/* Copyright 2022
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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 "sn74x138.h"
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#include "gpio.h"
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#define ADDRESS_PIN_COUNT 3
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#ifndef SN74X138_ADDRESS_PINS
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# error sn74x138: no address pins defined!
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#endif
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static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X138_ADDRESS_PINS;
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void sn74x138_init(void) {
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for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
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setPinOutput(address_pins[i]);
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writePinLow(address_pins[i]);
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}
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#if defined(SN74X138_E1_PIN)
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setPinOutput(SN74X138_E1_PIN);
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writePinHigh(SN74X138_E1_PIN);
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#endif
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#if defined(SN74X138_E2_PIN)
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setPinOutput(SN74X138_E2_PIN);
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writePinHigh(SN74X138_E2_PIN);
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#endif
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#if defined(SN74X138_E3_PIN)
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setPinOutput(SN74X138_E3_PIN);
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writePinLow(SN74X138_E3_PIN);
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#endif
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}
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void sn74x138_set_enabled(bool enabled) {
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#if defined(SN74X138_E1_PIN)
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writePin(SN74X138_E1_PIN, !enabled);
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#endif
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#if defined(SN74X138_E2_PIN)
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writePin(SN74X138_E2_PIN, !enabled);
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#endif
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#if defined(SN74X138_E3_PIN)
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writePin(SN74X138_E3_PIN, enabled);
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#endif
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}
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void sn74x138_set_addr(uint8_t address) {
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for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
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writePin(address_pins[i], address & (1 << i));
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}
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}
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48
drivers/gpio/sn74x138.h
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48
drivers/gpio/sn74x138.h
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@ -0,0 +1,48 @@
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/* Copyright 2022
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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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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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/**
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* Driver for 74x138 3-to-8 decoder/demultiplexer with inverting outputs
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* https://assets.nexperia.com/documents/data-sheet/74HC_HCT138.pdf
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*/
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/**
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* Initialize the address and output enable pins.
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*/
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void sn74x138_init(void);
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/**
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* Set the enabled state.
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*
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* When enabled is true, pulls the E1 and E2 pins low, and the E3 pin high.
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*
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* \param enabled The enable state to set.
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*/
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void sn74x138_set_enabled(bool enabled);
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/**
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* Set the output pin address.
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*
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* The selected output pin will be pulled low, while the remaining output pins will be high.
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*
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* \param address The address to set, from 0 to 7.
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*/
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void sn74x138_set_addr(uint8_t address);
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@ -41,22 +41,16 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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*/
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#define MATRIX_ROW_PINS { D6, D4, F6, F7, F4, F5, F0, F1 }
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#define MATRIX_ROW_PINS { D6, D4, F6, F7, F4, F5, F0, F1 }
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#define MATRIX_COL_PINS { }
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#define MATRIX_COL_PINS { C7, B6, C6, B4, B5, D7, NO_PIN, NO_PIN, NO_PIN, NO_PIN, NO_PIN, NO_PIN, NO_PIN, D3, B7, B3 } // Columns 6-12 controlled by demux
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#define UNUSED_PINS
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#define UNUSED_PINS
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/* COL2ROW, ROW2COL*/
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#define SN74X138_ADDRESS_PINS { D2, D1, D0 }
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#define DIODE_DIRECTION ROW2COL
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// For QMK DFU
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// For QMK DFU
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#define QMK_ESC_OUTPUT D6
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#define QMK_ESC_OUTPUT D6
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#define QMK_ESC_INPUT D7
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#define QMK_ESC_INPUT D7
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#define QMK_LED B0
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#define QMK_LED B0
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/*
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* Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN.
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*/
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//#define SOFT_SERIAL_PIN D0 // or D1, D2, D3, E6
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#define LED_NUM_LOCK_PIN B2
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#define LED_NUM_LOCK_PIN B2
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#define LED_CAPS_LOCK_PIN B0
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#define LED_CAPS_LOCK_PIN B0
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#define LED_SCROLL_LOCK_PIN B1
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#define LED_SCROLL_LOCK_PIN B1
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@ -14,268 +14,66 @@ GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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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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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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*/
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#include <stdint.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdbool.h>
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#include "wait.h"
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#include "util.h"
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#include "matrix.h"
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#include "matrix.h"
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#include "debounce.h"
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#include "quantum.h"
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#include "quantum.h"
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#include "sn74x138.h"
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#ifdef DIRECT_PINS
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static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
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#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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//static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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#endif
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// matrix code
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/* col 0: C7
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* col 1: B6
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#ifdef DIRECT_PINS
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static void init_pins(void) {
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for (int row = 0; row < MATRIX_ROWS; row++) {
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for (int col = 0; col < MATRIX_COLS; col++) {
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pin_t pin = direct_pins[row][col];
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if (pin != NO_PIN) {
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setPinInputHigh(pin);
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}
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}
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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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matrix_row_t last_row_value = current_matrix[current_row];
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current_matrix[current_row] = 0;
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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pin_t pin = direct_pins[current_row][col_index];
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if (pin != NO_PIN) {
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current_matrix[current_row] |= readPin(pin) ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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}
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return (last_row_value != current_matrix[current_row]);
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}
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#elif (DIODE_DIRECTION == COL2ROW)
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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; 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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current_matrix[current_row] = 0;
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// Select row and wait for row selecton to stabilize
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select_row(current_row);
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wait_us(30);
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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_matrix[current_row] |= 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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return (last_row_value != current_matrix[current_row]);
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}
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#elif (DIODE_DIRECTION == ROW2COL)
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/* Cols 0 - 15
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* col 0: C7
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* col 1: B6
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* col 2: C6
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* col 2: C6
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* col 3: B4
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* col 3: B4
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* col 4: B5
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* col 4: B5
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* col 5: D7
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* col 5: D7
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* These columns use a 74HC237D 3 to 8 bit demultiplexer.
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*
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* A0 A1 A2
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* These columns use a 74HC138 3 to 8 bit demultiplexer.
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* col / pin: PD2 PD1 PD0
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* A2 A1 A0
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* 6: 1 1 1
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* col / pin: PD0 PD1 PD2
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* 7: 0 1 1
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* 6: 1 1 1
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* 8: 1 0 1
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* 7: 1 1 0
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* 9: 0 0 1
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* 8: 1 0 1
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* 10: 1 1 0
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* 9: 1 0 0
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* 11: 0 1 0
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* 10: 0 1 1
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* 12: 1 0 0
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* 11: 0 1 0
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* col 13: D3
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* 12: 0 0 1
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* col 14: B7
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*
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* col 15: B3
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* col 13: D3
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* col 14: B7
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* col 15: B3
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*/
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*/
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static void select_col(uint8_t col) {
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static void select_col(uint8_t col) {
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switch (col) {
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if (col_pins[col] != NO_PIN) {
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case 0:
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writePinLow(col_pins[col]);
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writePinLow(C7);
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} else {
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break;
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sn74x138_set_addr(13 - col);
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case 1:
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writePinLow(B6);
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break;
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case 2:
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writePinLow(C6);
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break;
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case 3:
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writePinLow(B4);
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break;
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case 4:
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writePinLow(B5);
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break;
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case 5:
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writePinLow(D7);
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break;
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case 6:
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writePinHigh(D0);
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writePinHigh(D1);
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writePinHigh(D2);
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break;
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case 7:
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writePinHigh(D0);
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writePinHigh(D1);
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break;
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case 8:
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writePinHigh(D0);
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writePinHigh(D2);
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break;
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case 9:
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writePinHigh(D0);
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break;
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case 10:
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writePinHigh(D1);
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writePinHigh(D2);
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break;
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case 11:
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writePinHigh(D1);
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break;
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case 12:
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writePinHigh(D2);
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break;
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case 13:
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writePinLow(D3);
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break;
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case 14:
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writePinLow(B7);
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break;
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case 15:
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writePinLow(B3);
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break;
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}
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}
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}
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}
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static void unselect_col(uint8_t col) {
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static void unselect_col(uint8_t col) {
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switch (col) {
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if (col_pins[col] != NO_PIN) {
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case 0:
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setPinOutput(col_pins[col]);
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writePinHigh(C7);
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writePinHigh(col_pins[col]);
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break;
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} else {
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case 1:
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sn74x138_set_addr(0);
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writePinHigh(B6);
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break;
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case 2:
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writePinHigh(C6);
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break;
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case 3:
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writePinHigh(B4);
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break;
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case 4:
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writePinHigh(B5);
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break;
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case 5:
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writePinHigh(D7);
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break;
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case 6:
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writePinLow(D0);
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writePinLow(D1);
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writePinLow(D2);
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break;
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case 7:
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writePinLow(D0);
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writePinLow(D1);
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break;
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case 8:
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writePinLow(D0);
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writePinLow(D2);
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break;
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case 9:
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writePinLow(D0);
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break;
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case 10:
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writePinLow(D1);
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writePinLow(D2);
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break;
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case 11:
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writePinLow(D1);
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break;
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case 12:
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writePinLow(D2);
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break;
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case 13:
|
|
||||||
writePinHigh(D3);
|
|
||||||
break;
|
|
||||||
case 14:
|
|
||||||
writePinHigh(B7);
|
|
||||||
break;
|
|
||||||
case 15:
|
|
||||||
writePinHigh(B3);
|
|
||||||
break;
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
static void unselect_cols(void) {
|
static void unselect_cols(void) {
|
||||||
//Native
|
// Native
|
||||||
setPinOutput(D3);
|
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
|
||||||
setPinOutput(D7);
|
if (col_pins[x] != NO_PIN) {
|
||||||
writePinHigh(D3);
|
setPinOutput(col_pins[x]);
|
||||||
writePinHigh(D7);
|
writePinHigh(col_pins[x]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
setPinOutput(C6);
|
// Demultiplexer
|
||||||
setPinOutput(C7);
|
sn74x138_set_addr(0);
|
||||||
writePinHigh(C6);
|
|
||||||
writePinHigh(C7);
|
|
||||||
|
|
||||||
setPinOutput(B3);
|
|
||||||
setPinOutput(B4);
|
|
||||||
setPinOutput(B5);
|
|
||||||
setPinOutput(B6);
|
|
||||||
setPinOutput(B7);
|
|
||||||
writePinHigh(B3);
|
|
||||||
writePinHigh(B4);
|
|
||||||
writePinHigh(B5);
|
|
||||||
writePinHigh(B6);
|
|
||||||
writePinHigh(B7);
|
|
||||||
|
|
||||||
//Demultiplexer
|
|
||||||
setPinOutput(D0);
|
|
||||||
setPinOutput(D1);
|
|
||||||
setPinOutput(D2);
|
|
||||||
writePinLow(D0);
|
|
||||||
writePinLow(D1);
|
|
||||||
writePinLow(D2);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
static void init_pins(void) {
|
static void init_pins(void) {
|
||||||
@ -288,9 +86,9 @@ static void init_pins(void) {
|
|||||||
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
|
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
|
||||||
bool matrix_changed = false;
|
bool matrix_changed = false;
|
||||||
|
|
||||||
// Select col and wait for col selecton to stabilize
|
// Select col and wait for col selection to stabilize
|
||||||
select_col(current_col);
|
select_col(current_col);
|
||||||
wait_us(30);
|
matrix_io_delay();
|
||||||
|
|
||||||
// For each row...
|
// For each row...
|
||||||
for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
|
for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
|
||||||
@ -318,27 +116,20 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
|
|||||||
return matrix_changed;
|
return matrix_changed;
|
||||||
}
|
}
|
||||||
|
|
||||||
#endif
|
|
||||||
|
|
||||||
void matrix_init_custom(void) {
|
void matrix_init_custom(void) {
|
||||||
// initialize key pins
|
// initialize key pins
|
||||||
init_pins();
|
init_pins();
|
||||||
|
// initialize demultiplexer
|
||||||
|
sn74x138_init();
|
||||||
}
|
}
|
||||||
|
|
||||||
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
|
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
|
||||||
bool changed = false;
|
bool changed = false;
|
||||||
|
|
||||||
#if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
|
|
||||||
// Set row, read cols
|
|
||||||
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
|
|
||||||
changed |= read_cols_on_row(current_matrix, current_row);
|
|
||||||
}
|
|
||||||
#elif (DIODE_DIRECTION == ROW2COL)
|
|
||||||
// Set col, read rows
|
// Set col, read rows
|
||||||
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
|
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
|
||||||
changed |= read_rows_on_col(current_matrix, current_col);
|
changed |= read_rows_on_col(current_matrix, current_col);
|
||||||
}
|
}
|
||||||
#endif
|
|
||||||
|
|
||||||
return changed;
|
return changed;
|
||||||
}
|
}
|
||||||
|
|||||||
@ -18,6 +18,7 @@ RGBLIGHT_ENABLE = no # Enable keyboard RGB underglow
|
|||||||
AUDIO_ENABLE = no # Audio output
|
AUDIO_ENABLE = no # Audio output
|
||||||
|
|
||||||
CUSTOM_MATRIX = lite
|
CUSTOM_MATRIX = lite
|
||||||
SRC += matrix.c
|
VPATH += drivers/gpio
|
||||||
|
SRC += matrix.c sn74x138.c
|
||||||
|
|
||||||
LAYOUTS = fullsize_ansi fullsize_iso tkl_ansi tkl_iso
|
LAYOUTS = fullsize_ansi fullsize_iso tkl_ansi tkl_iso
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user