kopia lustrzana https://github.com/Qyon/STM32_RTTY
49 wiersze
1.3 KiB
C
49 wiersze
1.3 KiB
C
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/*
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*
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* Copyright (C) Patryk Jaworski <regalis@regalis.com.pl>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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 program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stm32f10x.h>
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#include "delay.h"
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static inline void systick_stop() {
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SysTick->CTRL &= ~(SysTick_CTRL_ENABLE_Msk);
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}
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static inline void systick_start() {
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
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}
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void delay_init() {
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SysTick->CTRL &= ~(SysTick_CTRL_CLKSOURCE_Msk); // AHB / 8 = 10.5MHz
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SysTick->LOAD = 1; // Tick every 1.047us
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}
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void _delay_us(uint32_t us) {
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systick_start();
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while (us != 0) {
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while ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == 0) {}
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--us;
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}
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systick_stop();
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}
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inline void _delay_ms(uint32_t ms) {
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_delay_us(ms * 1000);
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}
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