Janosch
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/*
|
|
* This file is part of the stm32-sine project.
|
|
*
|
|
* Copyright (C) 2021 David J. Fiddes <D.J@fiddes.net>
|
|
*
|
|
* 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/>.
|
|
*/
|
|
#ifndef DELAY_H
|
|
#define DELAY_H
|
|
|
|
/**
|
|
* \brief Blocking delay for a period
|
|
*
|
|
* \param[in] period Length of the delay in micro-seconds
|
|
*/
|
|
inline void uDelay(int period)
|
|
{
|
|
// Empirically determined constant by measurement of GPIO toggle
|
|
// of 1000 uS delay on a 72MHz STM32F103 processor
|
|
static const int CyclesPerMicroSecond = 12;
|
|
|
|
int iterations = period * CyclesPerMicroSecond;
|
|
|
|
for (int i = 0; i < iterations; i++)
|
|
{
|
|
__asm__("nop");
|
|
}
|
|
}
|
|
|
|
#endif // DELAY_H
|