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/************************************************************
* up_timerisr.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <8052.h>
#include "clock_internal.h"
#include "up_internal.h"
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Private Types
************************************************************/
/************************************************************
* Private Function Prototypes
************************************************************/
/************************************************************
* Global Functions
************************************************************/
/************************************************************
* Function: up_timerisr
*
* Description:
* The timer ISR will perform a variety of services for
* various portions of the systems.
*
************************************************************/
int up_timerisr(int irq, FAR ubyte *frame)
{
/* Process timer interrupt */
sched_process_timer();
return 0;
}
/************************************************************
* Function: up_timerinit
*
* Description:
* This function is called during start-up to initialize
* the timer interrupt.
*
************************************************************/
void up_timerinit(void)
{
#ifdef CONFIG_80C52_TIMER2
up_disable_irq(TIMER2_IRQ);
/* Set up timer 2 -- See up_internal.h for details */
T2MOD = 0;
/* Set up the capture count to generate 100Hz system
* interrupts.
*/
RCAP2L = TIMER2_CAPTURE_LOW;
RCAP2H = TIMER2_CAPTURE_HIGH;
TL2 = TIMER2_CAPTURE_LOW;
TH2 = TIMER2_CAPTURE_HIGH;
/* Configure for interrupts */
T2CON = 0x40;
/* Attach and enable the timer interrupt */
irq_attach(TIMER2_IRQ, (xcpt_t)up_timerisr);
up_enable_irq(TIMER2_IRQ);
#else
# warning "No support for timer 0 as the system timer"
#endif
}
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