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Diffstat (limited to 'keyboards/frobiac/blackbowl/matrix.c')
| -rw-r--r-- | keyboards/frobiac/blackbowl/matrix.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/keyboards/frobiac/blackbowl/matrix.c b/keyboards/frobiac/blackbowl/matrix.c new file mode 100644 index 0000000000..727e26ddc1 --- /dev/null +++ b/keyboards/frobiac/blackbowl/matrix.c @@ -0,0 +1,115 @@ +// Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com> +// Copyright 2017 Erin Call <hello@erincall.com> +// Copyright 2023 @frobiac +// SPDX-License-Identifier: GPL-2.0-or-later + +// This implements a matrix scan (lite) for the BlackBowl keyboard. +// Each side has a dedicated MCP23018 I2C expander. + +#include <stdint.h> +#include <stdbool.h> +#include <avr/io.h> +#include "wait.h" +#include "action_layer.h" +#include "print.h" +#include "debug.h" +#include "util.h" +#include "matrix.h" +#include "blackbowl.h" +#include "i2c_master.h" +#include "timer.h" + +#define MATRIX_ROWS_PER_SIDE (MATRIX_ROWS / 2) +#define ROW_SHIFTER ((matrix_row_t)1) + +static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col); + +static uint8_t expander_reset_loop; +uint8_t expander_status; +const uint8_t expander_input_mask = ((1 << MATRIX_ROWS_PER_SIDE) - 1); // No special mapping, 5 bits [0..4] per side +bool i2c_initialized = false; + +static const uint8_t I2C_ADDR_RIGHT = 0x4E; +static const uint8_t I2C_ADDR_LEFT = 0x46; +static const uint8_t i2c_addr[] = {I2C_ADDR_RIGHT, I2C_ADDR_LEFT}; + +void matrix_init_custom(void) { + if (!i2c_initialized) { + i2c_init(); + wait_ms(1000); + } + + // Pin direction and pull-up depends on diode direction and column register: + // ROW2COL, GPIOA => input, output + uint8_t direction[2] = {0, expander_input_mask}; + uint8_t pullup[2] = {0, expander_input_mask}; + + for (uint8_t i = 0; i < 2; ++i) { + expander_status = i2c_writeReg(i2c_addr[i], IODIRA, direction, 2, I2C_TIMEOUT); + if (expander_status) return; + + expander_status = i2c_writeReg(i2c_addr[i], GPPUA, pullup, 2, I2C_TIMEOUT); + } +} + +bool matrix_scan_custom(matrix_row_t current_matrix[]) { + bool matrix_has_changed = false; + + if (expander_status) { // if there was an error + ++expander_reset_loop; + if (++expander_reset_loop == 0) { + // since expander_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans + // this will be approx bit more frequent than once per second + matrix_init_custom(); + } + } + + for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) { + matrix_has_changed |= read_rows_on_col(current_matrix, current_col); + } + + return matrix_has_changed; +} + +static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) { + bool matrix_changed = false; + uint8_t port = 0xFF & ~(1 << current_col); + uint8_t column_state[] = {0, 0}; + + // On both expanders: select col and read rows + for (size_t i = 0; i < 2; ++i) { + if (!expander_status) { + expander_status = i2c_writeReg(i2c_addr[i], EXPANDER_COL_REGISTER, &port, 1, I2C_TIMEOUT); + } + wait_us(30); + + if (expander_status) { + return false; + } + + expander_status = i2c_readReg(i2c_addr[i], EXPANDER_ROW_REGISTER, &column_state[i], 1, I2C_TIMEOUT); + column_state[i] = (~column_state[i]) & ((1 << MATRIX_ROWS_PER_SIDE) - 1); + } + + // now map rows 0..4 on each side to cumulative to 0..9 + uint16_t col_state = column_state[0] | ((column_state[1] << MATRIX_ROWS_PER_SIDE) /*& 0x3e0*/); + + for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) { + // Store last value of row prior to reading + matrix_row_t last_row_value = current_matrix[current_row]; + + if (col_state & (1 << current_row)) { + // key closed; set state bit in matrix + current_matrix[current_row] |= (ROW_SHIFTER << current_col); + } else { + // key open; clear state bit in matrix + current_matrix[current_row] &= ~(ROW_SHIFTER << current_col); + } + + // Determine whether the matrix changed state + if ((last_row_value != current_matrix[current_row]) && !(matrix_changed)) { + matrix_changed = true; + } + } + return matrix_changed; +} |