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main.c
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main.c
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// vim: ts=4 sw=4 sts=4
/* ----------------------------------------------------------------------------
* main()
* ----------------------------------------------------------------------------
* Copyright (c) 2012 Ben Blazak <[email protected]>
* 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"
// ----------------------------------------------------------------------------
#define MAX_ACTIVE_LAYERS 20
// ----------------------------------------------------------------------------
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_pressed[KB_ROWS][KB_COLUMNS];
uint8_t main_loop_row;
uint8_t main_loop_col;
uint8_t main_arg_layer;
uint8_t main_arg_layer_offset;
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_peek(0);
main_layers_pressed[row][col] = layer;
} else {
layer = main_layers_pressed[row][col];
}
// set remaining vars, and "execute" key
main_arg_row = row;
main_arg_col = col;
main_arg_layer_offset = 0;
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)();
}
/* ----------------------------------------------------------------------------
* Layer Functions
* ----------------------------------------------------------------------------
* We keep track of which layer is foremost by placing it on a stack. Layers
* may appear in the stack more than once. The base layer will always be
* layer-0.
*
* Implemented as a fixed size stack.
* ------------------------------------------------------------------------- */
// ----------------------------------------------------------------------------
struct layers {
uint8_t layer;
uint8_t id;
};
// ----------------------------------------------------------------------------
struct layers layers[MAX_ACTIVE_LAYERS];
uint8_t layers_head = 0;
uint8_t layers_ids_in_use[MAX_ACTIVE_LAYERS] = {true};
/*
* peek()
*
* Arguments
* - 'offset': the offset (down the stack) from the head element
*
* Returns
* - success: the layer-number of the requested element (which may be 0)
* - failure: 0 (default) (out of bounds)
*/
uint8_t main_layers_peek(uint8_t offset) {
if (offset <= layers_head)
return layers[layers_head - offset].layer;
return 0; // default, or error
}
/*
* push()
*
* Arguments
* - 'layer': the layer-number to push to the top of the stack
*
* Returns
* - success: the id assigned to the newly added element
* - failure: 0 (the stack was already full)
*/
uint8_t main_layers_push(uint8_t layer) {
// look for an available id
for (uint8_t id=1; id<MAX_ACTIVE_LAYERS; id++)
// if one is found
if (layers_ids_in_use[id] == false) {
layers_ids_in_use[id] = true;
layers_head++;
layers[layers_head].layer = layer;
layers[layers_head].id = id;
return id;
}
return 0; // default, or error
}
/*
* pop_id()
*
* Arguments
* - 'id': the id of the element to pop from the stack
*/
void main_layers_pop_id(uint8_t id) {
// look for the element with the id we want to pop
for (uint8_t element=1; element<=layers_head; element++)
// if we find it
if (layers[element].id == id) {
// move all layers above it down one
for (; element<layers_head; element++) {
layers[element].layer = layers[element+1].layer;
layers[element].id = layers[element+1].id;
}
// reinitialize the topmost (now unused) slot
layers[layers_head].layer = 0;
layers[layers_head].id = 0;
// record keeping
layers_ids_in_use[id] = false;
layers_head--;
}
}
/*
* get_offset_id()
*
* Arguments
* - 'id': the id of the element you want the offset of
*
* Returns
* - success: the offset (down the stack from the head element) of the element
* with the given id
* - failure: 0 (default) (id unassigned)
*/
uint8_t main_layers_get_offset_id(uint8_t id) {
// look for the element with the id we want to get the offset of
for (uint8_t element=1; element<=layers_head; element++)
// if we find it
if (layers[element].id == id)
return (layers_head - element);
return 0; // default, or error
}
/* ----------------------------------------------------------------------------
* ------------------------------------------------------------------------- */