mirror of
https://github.com/trezor/trezor-firmware.git
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100 lines
3.0 KiB
C
100 lines
3.0 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_SYSTICK_H
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#define TREZORHAL_SYSTICK_H
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#include <trezor_types.h>
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#ifdef KERNEL_MODE
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// Initializes systick subsystem
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//
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// Before calling this function, none of the other functions
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// from this module should be called.
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void systick_init(void);
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// Deinitialize systick subsystem
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//
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// The function should be called before jumping to the
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// next bootloader stage or firmware.
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void systick_deinit(void);
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// Updates systick subsystem with new system clock frequency
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//
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// The function should be called after the system clock frequency
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// has been changed.
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void systick_update_freq(void);
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#endif // KERNEL_MODE
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// ----------------------------------------------------------------------------
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// Tick functions
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// Returns number of system clock cycles since the system start.
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//
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// Read monotonic counter with high resolution (Cortex-M SysTick clock)
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// (On 160MHz CPU, 1 cycles is 1 / 160MHz = 6.25ns)
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uint64_t systick_cycles(void);
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// Returns number of microseconds since the system start.
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uint64_t systick_us(void);
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// Returns number of ticks (milliseconds) since the system start.
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//
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// The returned value is a 32-bit unsigned integer that wraps
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// around every 49.7 days.
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uint32_t systick_ms(void);
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// Converts microseconds to system clock cycles
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uint64_t systick_us_to_cycles(uint64_t us);
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// Number of ticks (milliseconds)
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typedef uint32_t ticks_t;
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//
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#define ticks() systick_ms()
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// Helper function for building expiration time
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#define ticks_timeout(timeout) (systick_ms() + (timeout))
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// Helper function for checking ticks expiration
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//
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// It copes with the wrap-around of the `ticks_t` type but
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// still assumes that the difference between the two ticks
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// is less than half of the `ticks_t` range.
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#define ticks_expired(ticks) ((int32_t)(systick_ms() - (ticks)) >= 0)
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// ----------------------------------------------------------------------------
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// Delay functions
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// Waits for at least `ms` milliseconds
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void systick_delay_ms(uint32_t ms);
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// Waits for at least `us` microseconds
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void systick_delay_us(uint64_t us);
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// legacy functions
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static inline uint32_t hal_ticks_ms(void) { return systick_ms(); }
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static inline void hal_delay(uint32_t ms) { systick_delay_ms(ms); }
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static inline void hal_delay_us(uint64_t us) { systick_delay_us(us); }
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#endif // TREZORHAL_SYSTICK_H
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