mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-11 08:58:08 +00:00
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/*
|
|
* This file is part of the Trezor project, https://trezor.io/
|
|
*
|
|
* Copyright (c) SatoshiLabs
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef TREZORHAL_SYSTICK_H
|
|
#define TREZORHAL_SYSTICK_H
|
|
|
|
#include <trezor_types.h>
|
|
|
|
#ifdef KERNEL_MODE
|
|
|
|
// Initializes systick subsystem
|
|
//
|
|
// Before calling this function, none of the other functions
|
|
// from this module should be called.
|
|
void systick_init(void);
|
|
|
|
// Deinitialize systick subsystem
|
|
//
|
|
// The function should be called before jumping to the
|
|
// next bootloader stage or firmware.
|
|
void systick_deinit(void);
|
|
|
|
// Updates systick subsystem with new system clock frequency
|
|
//
|
|
// The function should be called after the system clock frequency
|
|
// has been changed.
|
|
void systick_update_freq(void);
|
|
|
|
#endif // KERNEL_MODE
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// Tick functions
|
|
|
|
// Returns number of system clock cycles since the system start.
|
|
//
|
|
// Read monotonic counter with high resolution (Cortex-M SysTick clock)
|
|
// (On 160MHz CPU, 1 cycles is 1 / 160MHz = 6.25ns)
|
|
uint64_t systick_cycles(void);
|
|
|
|
// Returns number of microseconds since the system start.
|
|
uint64_t systick_us(void);
|
|
|
|
// Returns number of ticks (milliseconds) since the system start.
|
|
//
|
|
// The returned value is a 32-bit unsigned integer that wraps
|
|
// around every 49.7 days.
|
|
uint32_t systick_ms(void);
|
|
|
|
// Converts microseconds to system clock cycles
|
|
uint64_t systick_us_to_cycles(uint64_t us);
|
|
|
|
// Number of ticks (milliseconds)
|
|
typedef uint32_t ticks_t;
|
|
|
|
//
|
|
#define ticks() systick_ms()
|
|
|
|
// Helper function for building expiration time
|
|
#define ticks_timeout(timeout) (systick_ms() + (timeout))
|
|
|
|
// Helper function for checking ticks expiration
|
|
//
|
|
// It copes with the wrap-around of the `ticks_t` type but
|
|
// still assumes that the difference between the two ticks
|
|
// is less than half of the `ticks_t` range.
|
|
#define ticks_expired(ticks) ((int32_t)(systick_ms() - (ticks)) >= 0)
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// Delay functions
|
|
|
|
// Waits for at least `ms` milliseconds
|
|
void systick_delay_ms(uint32_t ms);
|
|
|
|
// Waits for at least `us` microseconds
|
|
void systick_delay_us(uint64_t us);
|
|
|
|
// legacy functions
|
|
|
|
static inline uint32_t hal_ticks_ms(void) { return systick_ms(); }
|
|
static inline void hal_delay(uint32_t ms) { systick_delay_ms(ms); }
|
|
static inline void hal_delay_us(uint64_t us) { systick_delay_us(us); }
|
|
|
|
#endif // TREZORHAL_SYSTICK_H
|