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Add timer initialization and interrupt control

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@693 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-02-16 13:47:29 +00:00
parent aace60d986
commit 6ab50706bb
5 changed files with 330 additions and 4 deletions
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9
arch/z16/src/z16f/z16f_irq.c
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@ -40,8 +40,10 @@
#include <nuttx/config.h>
#include <sys/types.h>
#include <nuttx/irq.h>
#include <arch/irq.h>
#include <ez8.h>
#include "chip/chip.h"
#include "os_internal.h"
@ -109,7 +111,8 @@ void up_disable_irq(int irq)
if (irq >= Z16F_IRQ_IRQ0)
{
/* Disable the interrupt by clearing the corresponding bit in the
* appropriate IRQ enable register.
* appropriate IRQ enable high register. The enable low
* register is assumed to be zero, resulting interrupt disabled.
*/
if (irq < Z16F_IRQ_IRQ1)
@ -142,7 +145,9 @@ void up_enable_irq(int irq)
if (irq >= Z16F_IRQ_IRQ0)
{
/* Enable the interrupt by setting the corresponding bit in the
* appropriate IRQ enable register.
* appropriate IRQ enable register. The enable low
* register is assumed to be zero, resulting in "nomimal" interrupt
* priority.
*/
if (irq < Z16F_IRQ_IRQ1)

28
arch/z80/include/z8/irq.h
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@ -72,7 +72,7 @@
# endif
#endif
/* ez8 Interrupt Numbers */
/* ez8 Interrupt Numbers ****************************************************/
#if defined(ENCORE_VECTORS)
@ -198,7 +198,31 @@
#define Z8_IRQ_SYSTIMER Z8_TIMER0_IRQ
/* IRQ State Save Formatt
/* IRQ Management Macros ****************************************************/
/* These macros map IRQ numbers to IRQ registers and bits.
* WARNING: These have only been verified for the Z8F640X family!
*/
#if defined(_Z8ENCORE_F640X) || defined(_Z8ENCORE_640_FAMILY)
# define Z8_IRQ0_MIN Z8_TIMER2_IRQ
# define Z8_IRQ0_BIT(irq) (Z8_ADC_IRQ - (irq))
# define Z8_IRQ0_MAX Z8_ADC_IRQ
# define Z8_IRQ1_MIN Z8_P7AD_IRQ
# define Z8_IRQ1_BIT(irq) (Z8_P0AD_IRQ - (irq))
# define Z8_IRQ1_MAX Z8_P0AD_IRQ
# define Z8_IRQ2_MIN Z8_TIMER3_IRQ
# define Z8_IRQ3_BIT(irq) (Z8_C0_IRQ - (irq))
# define Z8_IRQ2_MAX Z8_C0_IRQ
#else
# error "Add IRQ support for Z8F family"
#endif
/* IRQ State Save Format ****************************************************
*
* These indices describe how the ez8 context is save in the state save array
*

23
arch/z80/src/z8/chip.h
View File

@ -74,6 +74,29 @@
* ZDS-II header file, ez8.h, to provide the correct addresses for each register.
*/
/* Timer Register Bit Definitions ***************************************************/
/* Timer control register */
#define Z8_TIMERCTL1_TEN _HX(80) /* Bit 7: Timer enabled */
#define Z8_TIMERCTL1_TPOL _HX(40) /* Bit 6: Timer input/output polarity */
#define Z8_TIMERSCTL_DIV1 _HX(00) /* Bits 3-5: Pre-scale divisor */
#define Z8_TIMERSCTL_DIV2 _HX(08)
#define Z8_TIMERSCTL_DIV4 _HX(10)
#define Z8_TIMERSCTL_DIV8 _HX(18)
#define Z8_TIMERSCTL_DIV16 _HX(20)
#define Z8_TIMERSCTL_DIV32 _HX(28)
#define Z8_TIMERSCTL_DIV64 _HX(30)
#define Z8_TIMERSCTL_DIV128 _HX(38)
#define Z8_TIMERSCTL_ONESHOT _HX(00) /* Bits 0-2: Timer mode */
#define Z8_TIMERSCTL_CONT _HX(01)
#define Z8_TIMERSCTL_COUNTER _HX(02)
#define Z8_TIMERSCTL_PWM _HX(03)
#define Z8_TIMERSCTL_CAPTURE _HX(04)
#define Z8_TIMERSCTL_COMPARE _HX(05)
#define Z8_TIMERSCTL_GATED _HX(06)
#define Z8_TIMERSCTL_CAPCMP _HX(07)
/* Register access macros ***********************************************************
*
* The register access mechanism provided in ez8.h differs from the useful in other

129
arch/z80/src/z8/z8_irq.c
View File

@ -73,6 +73,29 @@ struct z8_irqstate_s g_z8irqstate;
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_irqinitialize
****************************************************************************/
void up_irqinitialize(void)
{
/* Clear and disable all interrupts. Set all to priority 0. */
putreg8(0xff, Z8_IRQ0);
putreg8(0xff, Z8_IRQ1);
putreg8(0xff, Z8_IRQ2);
putreg16(0x0000, Z8_IRQ0_EN);
putreg16(0x0000, Z8_IRQ1_EN);
putreg16(0x0000, Z8_IRQ2_EN);
/* And finally, enable interrupts */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
EI();
#endif
}
/****************************************************************************
* Name: irqsave
*
@ -119,3 +142,109 @@ void irqrestore(irqstate_t flags)
EI();
}
}
/****************************************************************************
* Name: up_disable_irq
*
* Description:
* Disable the IRQ specified by 'irq'
*
****************************************************************************/
void up_disable_irq(int irq)
{
/* System exceptions cannot be disabled */
if (irq >= Z8_IRQ0_MIN)
{
/* Disable the interrupt by clearing the corresponding bit in the
* appropriate IRQ enable high register. The enable low
* register is assumed to be zero, resulting interrupt disabled.
*/
if (irq < Z8_IRQ0_MAX)
{
putreg8((getreg8(Z8_IRQ0_ENH) & ~Z8_IRQ0_BIT(irq)), Z8_IRQ0_ENH);
}
else if (irq < Z8_IRQ1_MAX)
{
putreg8((getreg8(Z8_IRQ1_ENH) & ~Z8_IRQ1_BIT(irq)), Z8_IRQ1_ENH);
}
else if (irq < NR_IRQS)
{
putreg8((getreg8(Z8_IRQ2_ENH) & ~Z8_IRQ2_BIT(irq)), Z8_IRQ2_ENH);
}
}
}
/****************************************************************************
* Name: up_enable_irq
*
* Description:
* Enable the IRQ specified by 'irq'
*
****************************************************************************/
void up_enable_irq(int irq)
{
/* System exceptions cannot be disabled */
if (irq >= Z8_IRQ0_MIN)
{
/* Enable the interrupt by setting the corresponding bit in the
* appropriate IRQ enable high register. The enable low
* register is assumed to be zero, resulting in "nomimal" interrupt
* priority.
*/
if (irq < Z8_IRQ0_MAX)
{
putreg8((getreg8(Z8_IRQ0_ENH) | Z8_IRQ0_BIT(irq)), Z8_IRQ0_ENH);
}
else if (irq < Z8_IRQ1_MAX)
{
putreg8((getreg8(Z8_IRQ1_ENH) | Z8_IRQ1_BIT(irq)), Z8_IRQ1_ENH);
}
else if (irq < NR_IRQS)
{
putreg8((getreg8(Z8_IRQ2_ENH) | Z8_IRQ2_BIT(irq)), Z8_IRQ2_ENH);
}
}
}
/****************************************************************************
* Name: up_maskack_irq
*
* Description:
* Mask the IRQ and acknowledge it
*
****************************************************************************/
void up_maskack_irq(int irq)
{
/* System exceptions cannot be disabled or acknowledged */
if (irq >= Z8_IRQ0_MIN)
{
/* Disable the interrupt by clearing the corresponding bit in the
* appropriate IRQ enable register and acknowledge it by setting the
* corresponding bit in the IRQ status register.
*/
if (irq < Z8_IRQ0_MAX)
{
putreg8((getreg8(Z8_IRQ0_ENH) & ~Z8_IRQ0_BIT(irq)), Z8_IRQ0_ENH);
putreg8(Z8_IRQ0_BIT(irq), Z8_IRQ0);
}
else if (irq < Z8_IRQ1_MAX)
{
putreg8((getreg8(Z8_IRQ1_ENH) & ~Z8_IRQ1_BIT(irq)), Z8_IRQ1_ENH);
putreg8(Z8_IRQ1_BIT(irq), Z8_IRQ2);
}
else if (irq < NR_IRQS)
{
putreg8((getreg8(Z8_IRQ2_ENH) & ~Z8_IRQ2_BIT(irq)), Z8_IRQ2_ENH);
putreg8(Z8_IRQ2_BIT(irq), Z8_IRQ2);
}
}
}

145
arch/z80/src/z8/z8_timerisr.c Normal file
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@ -0,0 +1,145 @@
/***************************************************************************
* arch/z80/src/z8/z8_timerisr.c
*
* Copyright (C) 2008 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 NuttX 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 <ez8.h>
#include "chip/chip.h"
#include "clock_internal.h"
#include "up_internal.h"
/***************************************************************************
* Definitions
***************************************************************************/
/* System clock frequency value from ZDS target settings */
extern ROM uint32 __user_frequency;
#define _DEFCLK ((uint32)&__user_frequency)
/***************************************************************************
* Private Types
***************************************************************************/
/***************************************************************************
* Private Functions
***************************************************************************/
/***************************************************************************
* Public Functions
***************************************************************************/
/***************************************************************************
* Function: up_timerisr
*
* Description:
* The timer ISR will perform a variety of services for various portions
* of the system.
*
***************************************************************************/
int up_timerisr(int irq, uint32 *regs)
{
/* 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)
{
up_disable_irq(Z8_IRQ_SYSTIMER);
/* Write to the timer control register to disable the timer, configure
* the timer for continuous mode, and set up the pre-scale value for
* divide by 4.
*/
putreg8( Z8_TIMERSCTL_DIV4 | Z8_TIMERSCTL_CONT, Z8_TIMER0_CTL);
/* Write to the timer high and low byte registers to set a starting
* count value (this effects only the first pass in continuous mode)
*/
putreg16(0x0001, Z8_TIMER0_HL);
/* Write to the timer reload register to set the reload value.
*
* In continuous mode:
*
* timer_period = reload_value x prescale / system_clock_frequency
* or
* reload_value = (timer_period * system_clock_frequency) / prescale
*
* For system_clock_frequency=18.432MHz, timer_period=10mS, and prescale=4,
* then reload_value=46,080 - OR:
*
* reload_value = system_clock_frequency / 400
*/
putreg16(((uint32)_DEFCLK / 400), Z8_TIMER0_R);
/* Write to the timer control register to enable the timer and to
* initiate counting
*/
putreg8((getreg8(Z8_TIMER0_CTL) | Z8_TIMERCTL_TEN), Z8_TIMER0_CTL);
/* Set the timer priority */
/* Attach and enable the timer interrupt (leaving at priority 0 */
irq_attach(Z8_IRQ_SYSTIMER, (xcpt_t)up_timerisr);
up_enable_irq(Z8_IRQ_SYSTIMER);
}