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82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
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/**
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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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* \author Francesco Sacchi <batt@develer.com>
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*
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* \brief Low-level timer module for LPC2xxx (implementation).
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*
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* notest:arm
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*/
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#include "cfg/cfg_timer.h"
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#include <cfg/macros.h> // BV()
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#include <cfg/debug.h> // BV()
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#include <drv/vic_lpc2.h>
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#include <io/lpc23xx.h>
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#include "timer_lpc2.h"
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/** HW dependent timer initialization */
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#if (CONFIG_TIMER == TIMER0_COMPARE0)
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#define TIMER0_ID 4
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void timer_hw_init(void)
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{
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/* Power on timer0 */
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PCONP |= BV(1);
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/* Set TIMER0 clk to CPU_FREQ */
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PCLKSEL0 &= ~0x0C;
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PCLKSEL0 |= 0x04;
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/* reset prescaler counter */
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T0PR = 0;
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/* Set match register 0 */
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T0MR0 = TIMER_HW_CNT;
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/* IRQ and reset counter on compare match 0 */
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T0MCR &= ~0x03;
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T0MCR |= 0x03;
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/* Reset timer0 counter and prescaler */
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T0TCR = 0x02;
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vic_setVector(TIMER0_ID, timer_handler);
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vic_enable(TIMER0_ID);
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/* Start timer0 */
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T0TCR = 0x01;
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}
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#else
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#error Unimplemented value for CONFIG_TIMER
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#endif /* CONFIG_TIMER */
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