e0f377fec0
Batch replaced to use new api. User code doesn't need this, but examples should be up to date, and this avoids deprecation warnings.
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
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* Copyright (C) 2012 Daniel Serpell <daniel.serpell@gmail.com>
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* Copyright (C) 2015 Piotr Esden-Tempski <piotr@esden.net>
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* Copyright (C) 2015 Chuck McManis <cmcmanis@mcmanis.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencm3/cm3/nvic.h>
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#include "clock.h"
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void clock_setup(void)
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{
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rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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/* set up the SysTick function (1mS interrupts) */
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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STK_CVR = 0;
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systick_set_reload(rcc_ahb_frequency / 1000);
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systick_counter_enable();
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systick_interrupt_enable();
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}
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/* simple millisecond counter */
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static volatile uint32_t system_millis;
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static volatile uint32_t delay_timer;
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/*
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* Simple systick handler
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*
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* Increments a 32 bit value once per millesecond
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* which rolls over every 49 days.
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*/
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void sys_tick_handler(void)
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{
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system_millis++;
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if (delay_timer > 0) {
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delay_timer--;
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}
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}
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/*
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* Simple spin loop waiting for time to pass
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*
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* A couple of things to note:
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* First, you can't just compare to
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* system_millis because doing so will mean
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* you delay forever if you happen to hit a
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* time where it is rolling over.
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* Second, accuracy is "at best" 1mS as you
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* may call this "just before" the systick hits
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* with a value of '1' and it would return
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* nearly immediately. So if you need really
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* precise delays, use one of the timers.
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*/
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void
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msleep(uint32_t delay)
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{
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delay_timer = delay;
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while (delay_timer);
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}
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uint32_t
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mtime(void)
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{
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return system_millis;
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}
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