ergodox-firmware/src/main.c

// vim: ts=4 sw=4 sts=4
/* ----------------------------------------------------------------------------
 * main()
 * ----------------------------------------------------------------------------
 * Copyright (c) 2012 Ben Blazak <benblazak.dev@gmail.com>
 * Released under The MIT License (MIT) (see "license.md")
 * Project located at <https://github.com/benblazak/ergodox-firmware>
 * ------------------------------------------------------------------------- */


#include <stdbool.h>
#include <stdint.h>
#include <util/delay.h>
#include "./lib-other/pjrc/usb_keyboard/usb_keyboard.h"
#include "./lib/key-functions/public.h"
#include "./keyboard/controller.h"
#include "./keyboard/layout.h"
#include "./keyboard/matrix.h"
#include "./main.h"

// ----------------------------------------------------------------------------

static bool _main_kb_is_pressed[KB_ROWS][KB_COLUMNS];
bool (*main_kb_is_pressed)[KB_ROWS][KB_COLUMNS] = &_main_kb_is_pressed;

static bool _main_kb_was_pressed[KB_ROWS][KB_COLUMNS];
bool (*main_kb_was_pressed)[KB_ROWS][KB_COLUMNS] = &_main_kb_was_pressed;

uint8_t main_layers_current;
uint8_t main_layers_press[KB_ROWS][KB_COLUMNS];
uint8_t main_layers_release[KB_ROWS][KB_COLUMNS];

uint8_t main_loop_row;
uint8_t main_loop_col;

uint8_t main_arg_layer;
uint8_t main_arg_row;
uint8_t main_arg_col;
bool    main_arg_is_pressed;
bool    main_arg_was_pressed;

// ----------------------------------------------------------------------------

/*
 * main()
 */
int main(void) {
	kb_init();  // does controller initialization too

	kb_led_state_power_on();

	usb_init();
	while (!usb_configured());
	kb_led_delay_usb_init();  // give the OS time to load drivers, etc.

	kb_led_state_ready();

	for (;;) {
		// swap `main_kb_is_pressed` and `main_kb_was_pressed`, then update
		bool (*temp)[KB_ROWS][KB_COLUMNS] = main_kb_was_pressed;
		main_kb_was_pressed = main_kb_is_pressed;
		main_kb_is_pressed = temp;

		kb_update_matrix(*main_kb_is_pressed);

		// this loop is responsible to
		// - "execute" keys when they change state
		// - keep track of which layers the keys were on when they were pressed
		//   (so they can be released using the function from that layer)
		//
		// note
		// - everything else is the key function's responsibility
		//   - see the keyboard layout file ("keyboard/ergodox/layout/*.c") for
		//     which key is assigned which function (per layer)
		//   - see "lib/key-functions/public/*.c" for the function definitions
		#define row         main_loop_row
		#define col         main_loop_col
		#define layer       main_arg_layer
		#define is_pressed  main_arg_is_pressed
		#define was_pressed main_arg_was_pressed
		for (row=0; row<KB_ROWS; row++) {
			for (col=0; col<KB_COLUMNS; col++) {
				is_pressed = (*main_kb_is_pressed)[row][col];
				was_pressed = (*main_kb_was_pressed)[row][col];

				if (is_pressed != was_pressed) {
					if (is_pressed) {
						layer = main_layers_press[row][col];
						main_layers_release[row][col] = layer;
					} else {
						layer = main_layers_release[row][col];
					}

					// set remaining vars, and "execute" key
					main_arg_row = row;
					main_arg_col = col;
					main_exec_key();
				}
			}
		}
		#undef row
		#undef col
		#undef layer
		#undef is_pressed
		#undef was_pressed

		// send the USB report (even if nothing's changed)
		usb_keyboard_send();
		_delay_ms(MAKEFILE_DEBOUNCE_TIME);

		// update LEDs
		if (keyboard_leds & (1<<0)) { kb_led_num_on(); }
		else { kb_led_num_off(); }
		if (keyboard_leds & (1<<1)) { kb_led_caps_on(); }
		else { kb_led_caps_off(); }
		if (keyboard_leds & (1<<2)) { kb_led_scroll_on(); }
		else { kb_led_scroll_off(); }
		if (keyboard_leds & (1<<3)) { kb_led_compose_on(); }
		else { kb_led_compose_off(); }
		if (keyboard_leds & (1<<4)) { kb_led_kana_on(); }
		else { kb_led_kana_off(); }
	}

	return 0;
}

// ----------------------------------------------------------------------------

// convenience macros (for the helper functions below)
#define  layer        main_arg_layer
#define  row          main_arg_row
#define  col          main_arg_col
#define  is_pressed   main_arg_is_pressed
#define  was_pressed  main_arg_was_pressed

// ----------------------------------------------------------------------------

/*
 * Exec key
 * - Execute the keypress or keyrelease function (if it exists) of the key at
 *   the current possition.
 */
void main_exec_key(void) {
	void (*key_function)(void) =
		( (is_pressed)
		  ? kb_layout_press_get(layer, row, col)
		  : kb_layout_release_get(layer, row, col) );

	if (key_function)
		(*key_function)();
}

// ----------------------------------------------------------------------------