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/*
*
* Copyright (C) Patryk Jaworski <regalis@regalis.com.pl>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stm32f4xx.h>
#include "delay.h"
static inline void systick_stop() {
SysTick->CTRL &= ~(SysTick_CTRL_ENABLE_Msk);
}
static inline void systick_start() {
SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
}
void delay_init() {
SysTick->CTRL &= ~(SysTick_CTRL_CLKSOURCE_Msk); // AHB / 8 = 10.5MHz
SysTick->LOAD = 10; // Tick every 1.047us
}
void _delay_us(uint32_t us) {
systick_start();
while (us != 0) {
while ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == 0) {}
--us;
}
systick_stop();
}
inline void _delay_ms(uint32_t ms) {
_delay_us(ms * 1000);
}