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204 lines
6.4 KiB
204 lines
6.4 KiB
// Copyright 2023 ZSA Technology Labs, Inc <@zsa>
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// Copyright 2023 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <stdint.h>
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#include "voyager.h"
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#include "mcp23018.h"
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#pragma GCC push_options
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#pragma GCC optimize("-O3")
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extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
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extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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static matrix_row_t raw_matrix_right[MATRIX_COLS];
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#define MCP_ROWS_PER_HAND (MATRIX_ROWS / 2)
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#ifndef VOYAGER_I2C_TIMEOUT
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# define VOYAGER_I2C_TIMEOUT 100
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#endif
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// Delay between each i2c io expander ops (in MCU cycles)
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#ifndef IO_EXPANDER_OP_DELAY
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# define IO_EXPANDER_OP_DELAY 500
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#endif
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extern bool mcp23018_leds[2];
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extern bool is_launching;
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static uint16_t mcp23018_reset_loop;
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uint8_t mcp23018_errors;
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bool io_expander_ready(void) {
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uint8_t tx;
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return mcp23018_readPins(MCP23018_DEFAULT_ADDRESS, mcp23018_PORTA, &tx);
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}
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void matrix_init_custom(void) {
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// outputs
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gpio_set_pin_output(B10);
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gpio_set_pin_output(B11);
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gpio_set_pin_output(B12);
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gpio_set_pin_output(B13);
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gpio_set_pin_output(B14);
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gpio_set_pin_output(B15);
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// inputs
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gpio_set_pin_input_low(A0);
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gpio_set_pin_input_low(A1);
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gpio_set_pin_input_low(A2);
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gpio_set_pin_input_low(A3);
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gpio_set_pin_input_low(A6);
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gpio_set_pin_input_low(A7);
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gpio_set_pin_input_low(B0);
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mcp23018_init(MCP23018_DEFAULT_ADDRESS);
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mcp23018_errors += !mcp23018_set_config(MCP23018_DEFAULT_ADDRESS, mcp23018_PORTA, 0b00000000);
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mcp23018_errors += !mcp23018_set_config(MCP23018_DEFAULT_ADDRESS, mcp23018_PORTB, 0b00111111);
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if (!mcp23018_errors) {
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is_launching = true;
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}
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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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// Attempt to reset the mcp23018 if it's not initialized
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if (mcp23018_errors) {
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if (++mcp23018_reset_loop > 0x1FFF) {
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if (io_expander_ready()) {
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// If we managed to initialize the mcp23018 - we need to reinitialize the matrix / layer state. During an electric discharge the i2c peripherals might be in a weird state. Giving a delay and resetting the MCU allows to recover from this.
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wait_ms(200);
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mcu_reset();
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}
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}
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}
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// Scanning left and right side of the keyboard for key presses.
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// Left side is scanned by reading the gpio pins directly, right side is scanned by reading the mcp23018 registers.
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matrix_row_t data = 0;
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for (uint8_t row = 0; row <= MCP_ROWS_PER_HAND; row++) {
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// strobe row
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switch (row) {
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case 0:
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gpio_write_pin_high(B10);
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break;
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case 1:
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gpio_write_pin_high(B11);
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break;
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case 2:
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gpio_write_pin_high(B12);
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break;
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case 3:
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gpio_write_pin_high(B13);
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break;
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case 4:
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gpio_write_pin_high(B14);
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break;
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case 5:
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gpio_write_pin_high(B15);
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break;
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case 6:
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break; // Left hand has 6 rows
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}
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// Selecting the row on the right side of the keyboard.
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if (!mcp23018_errors) {
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// select row
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mcp23018_errors += !mcp23018_set_output(MCP23018_DEFAULT_ADDRESS, mcp23018_PORTA, 0b01111111 & ~(1 << (row)));
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mcp23018_errors += !mcp23018_set_output(MCP23018_DEFAULT_ADDRESS, mcp23018_PORTB, ((uint8_t)!mcp23018_leds[1] << 6) | ((uint8_t)!mcp23018_leds[0] << 7));
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}
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// Reading the left side of the keyboard.
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if (row < MCP_ROWS_PER_HAND) {
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// i2c comm incur enough wait time
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if (mcp23018_errors) {
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// need wait to settle pin state
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matrix_io_delay();
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}
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// read col data
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data = ((readPin(A0) << 0) | (readPin(A1) << 1) | (readPin(A2) << 2) | (readPin(A3) << 3) | (readPin(A6) << 4) | (readPin(A7) << 5) | (readPin(B0) << 6));
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// unstrobe row
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switch (row) {
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case 0:
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gpio_write_pin_low(B10);
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break;
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case 1:
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gpio_write_pin_low(B11);
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break;
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case 2:
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gpio_write_pin_low(B12);
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break;
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case 3:
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gpio_write_pin_low(B13);
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break;
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case 4:
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gpio_write_pin_low(B14);
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break;
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case 5:
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gpio_write_pin_low(B15);
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break;
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case 6:
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break;
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}
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if (current_matrix[row] != data) {
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current_matrix[row] = data;
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changed = true;
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}
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}
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// Reading the right side of the keyboard.
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if (!mcp23018_errors) {
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for (uint16_t i = 0; i < IO_EXPANDER_OP_DELAY; i++) {
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__asm__("nop");
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}
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uint8_t rx;
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mcp23018_errors += !mcp23018_readPins(MCP23018_DEFAULT_ADDRESS, mcp23018_PORTB, &rx);
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data = ~(rx & 0b00111111);
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for (uint16_t i = 0; i < IO_EXPANDER_OP_DELAY; i++) {
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__asm__("nop");
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}
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} else {
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data = 0;
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}
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if (raw_matrix_right[row] != data) {
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raw_matrix_right[row] = data;
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changed = true;
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}
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}
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for (uint8_t row = 0; row < MCP_ROWS_PER_HAND; row++) {
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current_matrix[11 - row] = 0;
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for (uint8_t col = 0; col < MATRIX_COLS; col++) {
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current_matrix[11 - row] |= ((raw_matrix_right[6 - col] & (1 << row) ? 1 : 0) << col);
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}
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}
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return changed;
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}
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// DO NOT REMOVE
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// Needed for proper wake/sleep
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void matrix_power_up(void) {
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bool temp_launching = is_launching;
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matrix_init_custom();
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is_launching = temp_launching;
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if (!temp_launching) {
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STATUS_LED_1(false);
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STATUS_LED_2(false);
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STATUS_LED_3(false);
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STATUS_LED_4(false);
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}
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// initialize matrix state: all keys off
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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}
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}
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bool is_transport_connected(void) {
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return (bool)(mcp23018_errors == 0);
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}
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#pragma GCC pop_options
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