43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
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#ifndef SC_HID_KEYBOARD_H
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#define SC_HID_KEYBOARD_H
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#include "common.h"
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#include <stdbool.h>
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#include "aoa_hid.h"
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#include "trait/key_processor.h"
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// See "SDL2/SDL_scancode.h".
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// Maybe SDL_Keycode is used by most people, but SDL_Scancode is taken from USB
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// HID protocol.
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// 0x65 is Application, typically AT-101 Keyboard ends here.
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#define SC_HID_KEYBOARD_KEYS 0x66
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/**
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* HID keyboard events are sequence-based, every time keyboard state changes
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* it sends an array of currently pressed keys, the host is responsible for
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* compare events and determine which key becomes pressed and which key becomes
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* released. In order to convert SDL_KeyboardEvent to HID events, we first use
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* an array of keys to save each keys' state. And when a SDL_KeyboardEvent was
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* emitted, we updated our state, and then we use a loop to generate HID
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* events. The sequence of array elements is unimportant and when too much keys
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* pressed at the same time (more than report count), we should generate
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* phantom state. Don't forget that modifiers should be updated too, even for
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* phantom state.
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*/
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struct sc_hid_keyboard {
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struct sc_key_processor key_processor; // key processor trait
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struct sc_aoa *aoa;
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bool keys[SC_HID_KEYBOARD_KEYS];
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};
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bool
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sc_hid_keyboard_init(struct sc_hid_keyboard *kb, struct sc_aoa *aoa);
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void
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sc_hid_keyboard_destroy(struct sc_hid_keyboard *kb);
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#endif
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