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202 lines
5.4 KiB
202 lines
5.4 KiB
/* Copyright 2023 @ Keychron (https://www.keychron.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 "quantum.h"
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#ifndef SHIFT_COL_START
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# define SHIFT_COL_START 8
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#endif
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#ifndef SHIFT_COL_END
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# define SHIFT_COL_END 15
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#endif
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#if defined(SHIFT_COL_START) && defined(SHIFT_COL_END)
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# if ((SHIFT_COL_END - SHIFT_COL_START + 1) > 16)
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# define SIZE_T uint32_t
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# define UNSELECT_ALL_COL 0xFFFFFFFF
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# elif ((SHIFT_COL_END - SHIFT_COL_START + 1) > 8)
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# define SIZE_T uint16_t
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# define UNSELECT_ALL_COL 0xFFFF
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# else
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# define SIZE_T uint8_t
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# define UNSELECT_ALL_COL 0xFF
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# endif
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#endif
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pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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static inline void setPinOutput_writeLow(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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setPinOutput(pin);
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writePinLow(pin);
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}
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}
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static inline void setPinOutput_writeHigh(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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setPinOutput(pin);
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gpio_write_pin_high(pin);
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}
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}
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static inline void setPinInput_high(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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setPinInputHigh(pin);
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}
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}
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static inline uint8_t readMatrixPin(pin_t pin) {
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if (pin != NO_PIN) {
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return gpio_read_pin(pin);
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} else {
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return 1;
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}
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}
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static inline void HC595_delay(uint8_t n) {
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while (n-- > 0) {
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asm volatile("nop" ::: "memory");
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}
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}
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static void HC595_output(SIZE_T data, uint8_t bit) {
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uint8_t n = 1;
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ATOMIC_BLOCK_FORCEON {
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for (uint8_t i = 0; i < (SHIFT_COL_END - SHIFT_COL_START + 1); i++) {
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if (data & 0x1) {
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gpio_write_pin_high(HC595_DS);
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} else {
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writePinLow(HC595_DS);
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}
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gpio_write_pin_high(HC595_SHCP);
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HC595_delay(n);
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writePinLow(HC595_SHCP);
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HC595_delay(n);
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if (bit) {
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break;
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} else {
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data = data >> 1;
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}
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}
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gpio_write_pin_high(HC595_STCP);
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HC595_delay(n);
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writePinLow(HC595_STCP);
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HC595_delay(n);
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}
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}
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static bool select_col(uint8_t col) {
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pin_t pin = col_pins[col];
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if (col < SHIFT_COL_START || col > SHIFT_COL_END) {
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setPinOutput_writeLow(pin);
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return true;
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} else {
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if (col == SHIFT_COL_START) {
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HC595_output(0x00, 1);
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}
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return true;
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}
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return false;
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}
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static void unselect_col(uint8_t col) {
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pin_t pin = col_pins[col];
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if (col < SHIFT_COL_START || col > SHIFT_COL_END) {
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#ifdef MATRIX_UNSELECT_DRIVE_HIGH
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setPinOutput_writeHigh(pin);
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#else
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setPinInput_high(pin);
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#endif
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} else {
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HC595_output(0x01, 1);
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}
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}
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static void unselect_cols(void) {
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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pin_t pin = col_pins[x];
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if (x < SHIFT_COL_START || x > SHIFT_COL_END) {
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#ifdef MATRIX_UNSELECT_DRIVE_HIGH
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setPinOutput_writeHigh(pin);
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#else
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setPinInput_high(pin);
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#endif
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} else {
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if (x == SHIFT_COL_START) HC595_output(UNSELECT_ALL_COL, 0);
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}
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}
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}
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static void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col, matrix_row_t row_shifter) {
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bool key_pressed = false;
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// Select col
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if (!select_col(current_col)) { // select col
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return; // skip NO_PIN col
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}
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matrix_output_select_delay();
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// For each row...
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for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
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// Check row pin state
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if (readMatrixPin(row_pins[row_index]) == 0) {
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// Pin LO, set col bit
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current_matrix[row_index] |= row_shifter;
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key_pressed = true;
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} else {
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// Pin HI, clear col bit
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current_matrix[row_index] &= ~row_shifter;
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}
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}
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// Unselect col
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unselect_col(current_col);
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matrix_output_unselect_delay(current_col, key_pressed); // wait for all Row signals to go HIGH
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}
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void matrix_init_custom(void) {
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setPinOutput(HC595_DS);
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setPinOutput(HC595_STCP);
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setPinOutput(HC595_SHCP);
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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if (row_pins[x] != NO_PIN) {
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setPinInput_high(row_pins[x]);
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}
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}
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unselect_cols();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
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// Set col, read rows
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matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++, row_shifter <<= 1) {
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matrix_read_rows_on_col(curr_matrix, current_col, row_shifter);
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}
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bool changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
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if (changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
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return changed;
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}
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