86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
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* wait.c
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*
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* Created on: 10.12.2012
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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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#include <stdint.h>
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#include <MCF5475.h>
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#include <wait.h>
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uint32_t get_timer(void)
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{
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return MCF_SLT_SCNT(0);
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}
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static uint32_t timer_value;
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void start_timeout(void)
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{
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timer_value = get_timer();
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}
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bool end_timeout(uint32_t msec)
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{
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msec *= SYSCLK;
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return (get_timer() - timer_value) < msec ? false : true;
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}
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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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void wait(uint32_t us)
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{
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int32_t target = MCF_SLT_SCNT(0) - (us * (SYSCLK / 1000));
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while (MCF_SLT_SCNT(0) - target > 0);
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}
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void wait_us() __attribute__ ((weak, alias("wait")));
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/*
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* same as above, but with milliseconds wait time
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*/
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void wait_ms(uint32_t ms)
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{
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wait(ms * 1000);
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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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bool waitfor(uint32_t us, checker_func condition)
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{
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int32_t target = MCF_SLT_SCNT(0) - (us * (SYSCLK / 1000));
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bool 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 > 0);
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return false;
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}
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