frm.c

来自「基于ARM9TDMI的CMOS摄像头驱动源程序」· C语言 代码 · 共 81 行

/*
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Copyright (C) 2002, 2003 Motorola Semiconductors HK Ltd
 *
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/compatmac.h>
#include <linux/hdreg.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/blkpg.h>
#include <asm/irq.h>
#include <asm/arch/hardware.h>
#include <asm/arch/irqs.h>

extern int sensorFrameCount;

#define TIMER2_IRQ	58

#ifndef U32
typedef unsigned long U32;
#endif

#define MX1_TMR2_VA_VASE	(IO_ADDRESS(0x203000))
#define _reg_TMR_TCTL2     (*((volatile U32 *)(MX1_TMR2_VA_VASE+0x00)))
#define _reg_TMR_TPRER2    (*((volatile U32 *)(MX1_TMR2_VA_VASE+0x04)))
#define _reg_TMR_TCMP2     (*((volatile U32 *)(MX1_TMR2_VA_VASE+0x08)))
#define _reg_TMR_TSTAT2    (*((volatile U32 *)(MX1_TMR2_VA_VASE+0x14)))

static void timer2_intr_handler(int irq, void *dev_id, struct pt_regs *regs)
{
//	static int count=0;
	
	if (_reg_TMR_TSTAT2)
   	_reg_TMR_TSTAT2 = 0;    // clear interrupt	
	printk("Frame rate: %d\n", sensorFrameCount);
	sensorFrameCount = 0;	   	
//	printk("%d\n", count++);
}

int init_module()
{
	if (request_irq(TIMER2_IRQ, timer2_intr_handler, SA_INTERRUPT, "timer2", NULL))
		printk("request_irq for timer2 failed !\n");
	else
		printk("request_irq for timer2 suceed :-)\n");

   _reg_TMR_TPRER2 = 0;    	// divide by 1
   _reg_TMR_TCMP2 = 32768;   	// 1 Hz for 32768 Hz souce
   _reg_TMR_TCTL2 = 0x19;  	// compare intr, 32K source, enable timer

	
	return 0;
}

void cleanup_module()
{
		free_irq(TIMER2_IRQ, NULL);
}