976720c355
Be specifically careful with the usb examples. There is likely some breakage to be expected, not sure I updated all the drivers to the correct types for the respective chips.
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2013 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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/*
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* Now this is just the clock setup code from systick-blink as it is the
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* transferrable part.
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*/
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/systick.h>
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/* Common function descriptions */
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#include "clock.h"
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/* milliseconds since boot */
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static volatile uint32_t system_millis;
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/* Called when systick fires */
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void sys_tick_handler(void)
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{
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system_millis++;
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}
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/* simple sleep for delay milliseconds */
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void msleep(uint32_t delay)
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{
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uint32_t wake = system_millis + delay;
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while (wake > system_millis);
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}
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/* Getter function for the current time */
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uint32_t mtime(void)
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{
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return system_millis;
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}
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/*
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* clock_setup(void)
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*
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* This function sets up both the base board clock rate
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* and a 1khz "system tick" count. The SYSTICK counter is
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* a standard feature of the Cortex-M series.
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*/
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void clock_setup(void)
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{
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/* Base board frequency, set to 168Mhz */
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rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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/* clock rate / 168000 to get 1mS interrupt rate */
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systick_set_reload(168000);
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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systick_counter_enable();
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/* this done last */
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systick_interrupt_enable();
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}
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