sysirq_at91.c File Reference

System IRQ handler for Atmel AT91 ARM7 processors. More...

#include "sysirq_at91.h"
#include <io/arm.h>
#include <cpu/irq.h>
#include <cpu/types.h>
#include <cfg/module.h>
#include <cfg/macros.h>

Go to the source code of this file.

Defines
#define	SYSIRQ_PRIORITY   0
	default priority for system irqs.
Functions
void	pit_setEnable (bool enable)
	Enable/disable the Periodic Interrupt Timer interrupt.
static void	sysirq_dispatcher (void)
	System IRQ dispatcher.
void	sysirq_init (void)
	Init system IRQ handling.
void	sysirq_setHandler (sysirq_t irq, sysirq_handler_t handler)
	Helper function used to set handler for system IRQ irq.
void	sysirq_setEnable (sysirq_t irq, bool enable)
	Helper function used to enable/disable system IRQ irq.
bool	sysirq_enabled (sysirq_t irq)
	Helper function used to get system IRQ irq state.
Variables
static SysIrq	sysirq_tab []
	Table containing all system irqs.

---

Detailed Description

System IRQ handler for Atmel AT91 ARM7 processors.

Version:

Id

sysirq_at91.c 1761 2008-08-29 20:37:03Z bernie

Author:

Francesco Sacchi <batt@develer.com>

In Atmel AT91 ARM7TDMI processors, there are various peripheral interrupt sources. In general, every source has its own interrupt vector, so it is possible to assign a specific handler for each interrupt independently. However, there are a few sources called "system sources" that share a common IRQ line and vector, called "system IRQ". So a unique system IRQ dispatcher is implemented here. This module also contains an interface to manage every source independently. It is possible to assign to every system IRQ a specific IRQ handler.

See also:

sysirq_setHandler

sysirq_setEnable

Definition in file sysirq_at91.c.

---

Function Documentation

static void sysirq_dispatcher

(

void

)

[static]

System IRQ dispatcher.

This is the entry point for all system IRQs in AT91. This function checks for interrupt enable state of various sources (system timer, etc..) and calls the corresponding handler.

Definition at line 97 of file sysirq_at91.c.

void sysirq_init

(

void

)

Init system IRQ handling.

Note:

all system interrupts are disabled.

Definition at line 120 of file sysirq_at91.c.