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244 lines
5.8 KiB
244 lines
5.8 KiB
/*
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Copyright 2018 listofoptions <listofoptions@gmail.com>
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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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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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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 <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#if defined(__AVR__)
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#include <avr/io.h>
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#endif
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#include <util/delay.h>
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#include "wait.h"
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#include "timer.h"
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#include "LUFA/Drivers/Peripheral/SPI.h"
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#include "config.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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#if ( DEBOUNCE > 0 )
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static uint16_t debouncing_time ;
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static bool debouncing = false ;
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#endif
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static uint8_t matrix [MATRIX_ROWS] = {0};
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#if ( DEBOUNCE > 0 )
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static uint8_t matrix_debounce_old [MATRIX_ROWS] = {0};
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static uint8_t matrix_debounce_new [MATRIX_ROWS] = {0};
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#endif
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__attribute__ ((weak))
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void matrix_init_quantum(void) {
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matrix_init_kb();
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}
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__attribute__ ((weak))
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void matrix_scan_quantum(void) {
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matrix_scan_kb();
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}
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__attribute__ ((weak))
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void matrix_init_kb(void) {
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matrix_init_user();
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}
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__attribute__ ((weak))
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void matrix_scan_kb(void) {
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matrix_scan_user();
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}
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__attribute__ ((weak))
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void matrix_init_user(void) {
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}
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__attribute__ ((weak))
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void matrix_scan_user(void) {
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}
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// the keyboard's internal wiring is such that the inputs to the logic are
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// a clock signal, and a reset line.
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// the output is a single output pin. im bitbanging here, but the SPI controller
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// would work normally
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//
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// the device functions, by using the clock signal to count 128 bits, the lower
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// 3 bits of this 7 bit counter are tied to a 1-of-8 multiplexer, this forms
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// the columns.
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// the upper 4 bits form the rows, and are decoded using bcd to decimal
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// decoders, so that 14 out of 16 of the outputs are wired to the rows of the
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// matrix. each switch has a diode, such that the row signal feeds into the
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// switch, and then into the diode, then into one of the columns into the
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// matrix. the reset pin can be used to reset the entire counter.
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#define RESET _BV(PB0)
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#define SCLK _BV(PB1)
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#define SDATA _BV(PB3)
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#define LED _BV(PD6)
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inline
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static
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void SCLK_increment(void) {
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PORTB &= ~SCLK ;
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_delay_us( 4 ) ; // make sure the line is stable
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PORTB |= SCLK ;
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_delay_us( 4 ) ;
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return ;
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}
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inline
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static
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void Matrix_Reset(void) {
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PORTB |= RESET ;
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_delay_us( 4 ) ; // make sure the line is stable
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PORTB &= ~RESET ;
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return ;
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}
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inline
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static
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uint8_t Matrix_ReceiveByte (void) {
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uint8_t received = 0 ;
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uint8_t temp = 0 ;
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for ( uint8_t bit = 0; bit < MATRIX_COLS; ++bit ) {
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// toggle the clock
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SCLK_increment();
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temp = (PINB & SDATA) << 4 ;
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received |= temp >> bit ;
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}
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return received ;
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}
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inline
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static
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void Matrix_ThrowByte(void) {
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// we use MATRIX_COLS - 1 here because that would put us at 7 clocks
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for ( uint8_t bit = 0; bit < MATRIX_COLS - 1; ++bit ) {
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// toggle the clock
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SCLK_increment();
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}
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return ;
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}
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void matrix_init () {
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// debug_matrix = 1;
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// PB0 (SS) and PB1 (SCLK) set to outputs
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DDRB |= RESET | SCLK ;
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// PB2, is unused, and PB3 is our serial input
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DDRB &= ~SDATA ;
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// SS is reset for this board, and is active High
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// SCLK is the serial clock and is active High
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PORTB &= ~RESET ;
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PORTB |= SCLK ;
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// led pin
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DDRD |= LED ;
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PORTD &= ~LED ;
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matrix_init_quantum();
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//toggle reset, to put the keyboard logic into a known state
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Matrix_Reset() ;
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}
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uint8_t matrix_scan(void) {
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// the first byte of the keyboard's output data can be ignored
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Matrix_ThrowByte();
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#if ( DEBOUNCE > 0 )
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for ( uint8_t row = 0 ; row < MATRIX_ROWS ; ++row ) {
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//transfer old debouncing values
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matrix_debounce_old[row] = matrix_debounce_new[row] ;
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// read new key-states in
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matrix_debounce_new[row] = Matrix_ReceiveByte() ;
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if ( matrix_debounce_new[row] != matrix_debounce_old[row] ) {
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debouncing = true ;
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debouncing_time = timer_read() ;
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}
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}
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#else
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// without debouncing we simply just read in the raw matrix
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for ( uint8_t row = 0 ; row < MATRIX_ROWS ; ++row ) {
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matrix[row] = Matrix_ReceiveByte ;
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}
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#endif
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#if ( DEBOUNCE > 0 )
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if ( debouncing && ( timer_elapsed( debouncing_time ) > DEBOUNCE ) ) {
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for ( uint8_t row = 0 ; row < MATRIX_ROWS ; ++row ) {
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matrix[row] = matrix_debounce_new[row] ;
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}
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debouncing = false ;
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}
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#endif
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Matrix_Reset() ;
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matrix_scan_quantum() ;
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return 1;
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}
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inline
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uint8_t matrix_get_row( uint8_t row ) {
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 01234567\n");
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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phex(row); print(": ");
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print_bin_reverse8(matrix_get_row(row));
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print("\n");
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}
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}
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inline
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uint8_t matrix_rows(void) {
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void) {
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return MATRIX_COLS;
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}
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// as an aside, I used the M0110 converter:
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// tmk_core/common/keyboard.c, quantum/matrix.c, and the project layout of the planck
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// the online ducmentation starting from :
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// https://docs.qmk.fm/#/config_options
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// https://docs.qmk.fm/#/understanding_qmk
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// and probably a few i forgot....
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