66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*
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* wait.h
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*
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* Author: mfro
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*
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* This file is part of BaS_gcc.
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*
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* BaS_gcc 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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* BaS_gcc 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 BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 - 2012 F. Aschwanden
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* Copyright 2011 - 2012 V. Riviere
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* Copyright 2012 M. Froeschle
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*
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*/
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#ifndef _WAIT_H_
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#define _WAIT_H_
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#include <bas_types.h>
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#include <stdint.h>
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#include "MCF5475.h"
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typedef bool (*checker_func)(void);
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extern __inline__ void wait(uint32_t) __attribute__((always_inline));
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extern __inline__ bool waitfor(uint32_t us, checker_func condition) __attribute__((always_inline));
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/*
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* wait for the specified number of us on slice timer 0. Replaces the original routines that had
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* the number of useconds to wait for hardcoded in their name.
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*/
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extern __inline__ void wait(uint32_t us)
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{
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uint32_t target = MCF_SLT_SCNT(0) - (us * 132);
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while (MCF_SLT_SCNT(0) > target);
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}
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/*
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* the same as above, with a checker function which gets called while
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* busy waiting and allows for an early return if it returns true
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*/
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extern __inline__ bool waitfor(uint32_t us, checker_func condition)
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{
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uint32_t target = MCF_SLT_SCNT(0) - (us * 132);
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uint32_t res;
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do
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{
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if ((res = (*condition)()))
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return res;
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} while (MCF_SLT_SCNT(0) > target);
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return false;
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}
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#endif /* _WAIT_H_ */
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