mirror of
https://github.com/markqvist/OpenModem
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74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos 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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief Low-level timer driver (SysTick) for LM3S1968.
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*
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* \author Andrea Righi <arighi@develer.com>
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*/
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#include "timer_cm3.h"
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#include <cfg/debug.h>
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#include <cpu/irq.h>
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#include <drv/irq_cm3.h>
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INLINE void timer_hw_setPeriod(unsigned long period)
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{
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ASSERT(period < (1 << 24));
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NVIC_ST_RELOAD_R = period - 1;
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}
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static void timer_hw_enable(void)
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{
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NVIC_ST_CTRL_R |=
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NVIC_ST_CTRL_CLK_SRC | NVIC_ST_CTRL_ENABLE | NVIC_ST_CTRL_INTEN;
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}
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static void timer_hw_disable(void)
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{
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NVIC_ST_CTRL_R &= ~(NVIC_ST_CTRL_ENABLE | NVIC_ST_CTRL_INTEN);
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}
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void timer_hw_init(void)
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{
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timer_hw_setPeriod(CPU_FREQ / TIMER_TICKS_PER_SEC);
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sysirq_setHandler(FAULT_SYSTICK, timer_handler);
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timer_hw_enable();
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}
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void timer_hw_exit(void)
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{
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timer_hw_disable();
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sysirq_freeHandler(FAULT_SYSTICK);
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}
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