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https://github.com/trezor/trezor-firmware.git
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91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
#ifndef TREZOR_HAL_TOUCH_H
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#define TREZOR_HAL_TOUCH_H
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#include <stdint.h>
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#include "secbool.h"
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// Initializes the touch driver
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//
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// Powers on and initializes touch driver controller.
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// The function has no effect if the driver was already initialized.
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//
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// Returns `sectrue` if the hardware was successfuly initialized.
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secbool touch_init(void);
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// Deinitializes the touch driver
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//
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// The function deinitializes touch controller and powers it off.
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void touch_deinit();
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// Checks if the touch driver is ready to report touches
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//
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// Some drivers need time after power-up to stabilize. The app
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// may use this function to wait until touch controller is
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// fully functional.
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secbool touch_ready(void);
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// Gets the touch controller firmware version
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//
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// Can be called only if the touch controller was initialized,
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// othervise returns 0.
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//
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// We do not interpret the value of the version, we just print it
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// during the production test.
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uint8_t touch_get_version(void);
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// Sets touch controller sensitivity
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//
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// (Internally threadhsold for ????)
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secbool touch_set_sensitivity(uint8_t value);
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// Checks if the touch is currently reporting any events
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//
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// The purpose of this function is very special. It is used
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// in bootloader startup to detect if the user is touching the screen.
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// On some hardware it's a bit more sensitive then `touch_get_event()`
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// since it does not filter out any events.
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//
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// The function should not be used together with `touch_get_event()`.
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secbool touch_activity(void);
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// Returns the last event in packed 32-bit format
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//
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// Returns `0` if there's no event or the driver is not initialized.
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uint32_t touch_get_event(void);
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// Touch event is packed 32-bit value
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//
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// 31 24 23 12 11 0
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// |--------|------------|------------|
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// | event | x-coord | y-coord |
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// |--------|------------|------------|
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//
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//
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// Touch event bits
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#define TOUCH_START (1U << 24)
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#define TOUCH_MOVE (1U << 25)
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#define TOUCH_END (1U << 26)
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// Returns x-coordinates from a packed touch event
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static inline uint16_t touch_unpack_x(uint32_t evt) {
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return (evt >> 12) & 0xFFF;
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}
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// Returns y-coordinates from a packed touch event
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static inline uint16_t touch_unpack_y(uint32_t evt) {
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return (evt >> 0) & 0xFFF;
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}
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// Creates packed touch event from x and y coordinates
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static inline uint32_t touch_pack_xy(uint16_t x, uint16_t y) {
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return ((x & 0xFFF) << 12) | (y & 0xFFF);
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}
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// -------------------------
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// legacy:
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uint32_t touch_is_detected(void);
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#endif //_TOUCH_H
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