rtt-f030/bsp/x1000/driver/drv_ost.c

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2016-04-24 19:34:41 +08:00
/*
* File : board_timer.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2015-11-19 Urey the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <stdint.h>
#include "board.h"
#include "drv_clock.h"
#include "drv_ost.h"
/**
* This is the OST timer interrupt service routine.
*/
void rt_hw_ost_handler(void)
{
/* increase a OS tick */
rt_tick_increase();
/* clear flag */
REG_OSTFR = 0;
}
void rt_hw_ost_init(void)
{
rt_uint32_t cnt, div;
struct clk *clk;
div = OST_DIV16;
cnt = BOARD_EXTAL_CLK / 16;
/* enable OST clock */
clk = clk_get("sys_ost");
clk_enable(clk);
/* Disable OST (channel 1/2) */
REG_OSTECR = 0x3;
/* clear counter */
REG_OSTCR = 0x01;
REG_OST1CNT = 0;
/* set timer data (channel 1) */
REG_OST1DFR = (cnt / RT_TICK_PER_SECOND - 1);
/* set prescale ext clk */
REG_OSTCCR = div;
/* unmask interrupt */
REG_OSTMR = 0;
/* enable OST (channel 1) */
REG_OSTESR = 0x01;
clk_put(clk);
}