trezor-firmware/timer.h

/*
 * This file is part of the TREZOR project.
 *
 * Copyright (C) 2016 Saleem Rashid <trezor@saleemrashid.com>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */


#include <stdint.h>

/* 1 tick = 1 ms */
extern volatile uint32_t system_millis;

/* Screen timeout */
extern uint32_t system_millis_lock_start;

void timer_init(void);

void sys_tick_handler(void);
timer: Use Cortex-M3 SysTick timers Removed `usbDelay(uint32_t cycles)`, added `usbSleep(uint32_t millis)` The same method signature could cause silent code breakage at runtime, as opposed to noisy code breakage at compile time which is the better kind. 2016-11-17 19:07:41 +00:00			`/*`
			`* This file is part of the TREZOR project.`
			`*`
			`* Copyright (C) 2016 Saleem Rashid <trezor@saleemrashid.com>`
			`*`
			`* This library is free software: you can redistribute it and/or modify`
			`* it under the terms of the GNU Lesser General Public License as published by`
			`* the Free Software Foundation, either version 3 of the License, or`
			`* (at your option) any later version.`
			`*`
			`* This library 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 Lesser General Public License for more details.`
			`*`
			`* You should have received a copy of the GNU Lesser General Public License`
			`* along with this library. If not, see <http://www.gnu.org/licenses/>.`
			`*/`


			`#include <stdint.h>`

			`/* 1 tick = 1 ms */`
			`extern volatile uint32_t system_millis;`

timer: Replace screen timeout with SysTick This provides an incredibly accurate screen timeout and removes the superfluous screen timeout counter 2016-11-17 19:10:57 +00:00			`/* Screen timeout */`
timer: Fix non-critical integer overflow (#129) Every 4294967295 milliseconds (2 ^ 32 - 1), system_millis will overflow. This means that every 49.71 days, system_millis will reset to zero. Comparisons like `system_millis < (system_millis + 1)` would fail if the latter had overflown and the former had not. This is non-critical because the worst case is that one second could be skipped or the screen could lock early. This poses no threat to the exponential backoff used for protection against brute force. 2016-11-23 19:22:28 +00:00			`extern uint32_t system_millis_lock_start;`
timer: Replace screen timeout with SysTick This provides an incredibly accurate screen timeout and removes the superfluous screen timeout counter 2016-11-17 19:10:57 +00:00
timer: Use Cortex-M3 SysTick timers Removed `usbDelay(uint32_t cycles)`, added `usbSleep(uint32_t millis)` The same method signature could cause silent code breakage at runtime, as opposed to noisy code breakage at compile time which is the better kind. 2016-11-17 19:07:41 +00:00			`void timer_init(void);`

			`void sys_tick_handler(void);`