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https://github.com/trezor/trezor-firmware.git
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70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TREZORHAL_BUTTON_H
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#define TREZORHAL_BUTTON_H
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#include <trezor_types.h>
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// Button event is packed 32-bit value
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//
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// 31 24 23 0
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// |--------|-------------------------|
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// | event | button identifier |
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// |--------|-------------------------|
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//
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//
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// Button events
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#define BTN_EVT_DOWN (1U << 24)
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#define BTN_EVT_UP (1U << 25)
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// Button identifiers
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typedef enum {
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BTN_LEFT = 0,
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BTN_RIGHT = 1,
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BTN_POWER = 2,
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} button_t;
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#ifdef KERNEL_MODE
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// Initializes button driver
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//
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// Returns true in case of success, false otherwise
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bool button_init(void);
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#endif // KERNEL_MODE
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// Get the last button event
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//
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// It's expected there's just one consumer of the button events,
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// e.g. the main loop
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//
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// Returns 0 if no event is available
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uint32_t button_get_event(void);
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// Checks if the specified button is currently pressed
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//
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// The current implementation returns the state of the button at the time
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// `button_get_event()` was called. In the future, we may fix this limitation.
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// For now, `button_get_event()` must be called before `button_is_down()`.
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bool button_is_down(button_t button);
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#endif // TREZORHAL_BUTTON_H
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