7a9457bb07
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5145 42af7a65-404d-4744-a932-0658087f49c3
148 lines
4.6 KiB
C
148 lines
4.6 KiB
C
/************************************************************************
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* up_timerisr.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************/
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/************************************************************************
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* Included Files
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************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <8052.h>
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#include "clock_internal.h"
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#include "up_internal.h"
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/************************************************************************
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* Definitions
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************************************************************************/
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/************************************************************************
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* Private Types
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************************************************************************/
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/************************************************************************
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* Private Function Prototypes
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************************************************************************/
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/************************************************************************
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* Global Functions
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************************************************************************/
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/************************************************************************
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* Function: up_timerisr
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*
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* Description:
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* The timer ISR will perform a variety of services for
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* various portions of the systems.
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*
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************************************************************************/
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int up_timerisr(int irq, FAR uint8_t *frame)
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{
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/* Process timer interrupt */
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sched_process_timer();
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return 0;
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}
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/************************************************************************
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* Function: up_timerinit
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*
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* Description:
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* This function is called during start-up to initialize
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* the timer interrupt.
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*
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************************************************************************/
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void up_timerinit(void)
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{
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#ifdef CONFIG_8052_TIMER2
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up_disable_irq(TIMER2_IRQ);
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/* Set up timer 2 -- See pjrc.h for details */
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T2MOD = 0;
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/* Set up the capture count to generate 100Hz system
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* interrupts.
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*/
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RCAP2L = TIMER2_CAPTURE_LOW;
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RCAP2H = TIMER2_CAPTURE_HIGH;
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TL2 = TIMER2_CAPTURE_LOW;
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TH2 = TIMER2_CAPTURE_HIGH;
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/* Configure for interrupts */
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T2CON = 0x04;
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/* Attach and enable the timer interrupt */
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irq_attach(TIMER2_IRQ, (xcpt_t)up_timerisr);
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up_enable_irq(TIMER2_IRQ);
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#else
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/* Timer 0, mode 0 can be used as a system timer. In that mode, the
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* 1.8432 MHz clock is divided by 32. A single 8-bit value is incremented
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* at 57600 Hz, which results in 225 Timer 0 overflow interrupts per
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* second.
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*/
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up_disable_irq(TIMER0_IRQ);
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/* Initialize timer 0 */
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TR0 = 0; /* Make sure timer 0 is stopped */
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TF0 = 0; /* Clear the overflow flag */
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TMOD &= 0xF0; /* Set to mode 0 (without changing timer1) */
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TL0 = 0; /* Clear timer 0 value */
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TH0 = 0;
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/* Attach and enable the timer interrupt */
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irq_attach(TIMER0_IRQ, (xcpt_t)up_timerisr);
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TR0 = 1; /* Start the timer */
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up_enable_irq(TIMER0_IRQ);
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#endif
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}
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