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systick.h
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/
systick.h
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/* Copyright 2023, Darran A Lofthouse
*
* This file is part of pico-util.
*
* pico-sha-test 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.
*
* pico-util 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 pico-util.
* If not, see <https://www.gnu.org/licenses/>.
*/
/*
* Start the SYST count using the processor clock source.
*
* If the counter is already running reset it so it starts again.
*/
extern void start_syst_counter();
/*
* Stop the SYST counter and return number of elapsed ticks.
*
* Return -1 if the timer was not running, -2 if a complete cycle has elapsed.
*/
extern uint32_t stop_syst_counter();