OS_DisableInterrupts

Syntax

#include <nitro/os.h>

OSIntrMode OS_DisableInterrupts( void );

Arguments

None.

Return Values

Returns a value that indicates the state before this function was called.

The type of the return value is OSIntrMode (a u32 typedef), but the values that can be returned will be one of the OSIntrMode_Irq enumerated type values below.

Value Previous state
OS_INTRMODE_IRQ_DISABLE IRQ Disable (prohibited)
OS_INTRMODE_IRQ_ENABLE IRQ Enable (permitted)

Description

This function disables IRQ interrupts.

The master enable flag for all interrupts (the Interrupt Master Enable Flag) is what is disabled here. If IRQs are disabled with this function, no interrupts will occur even if IRQ interrupt causes are individually set to enable.

The return value indicates the state prior to calling the function.

Internal Operation

Sets (set is disabled) the CPSR (current program status register) IRQ interrupt control bit.

See Also

OS_EnableInterrupts, OS_RestoreInterrupts

Revision History

2005/03/08 Standardized the Japanese term for "interrupt."
2004/03/04 Changed so FIQ is not included in processing.
2004/01/14 Changed so FIQ is included in processing.
2003/12/01 Initial version.

CONFIDENTIAL