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/*******************************************************************//**
*
* \file Interrupts.c
*
* \author Xavier Del Campo
*
* \brief Implementation of Interrupts module.
*
************************************************************************/
/* *************************************
* Includes
* *************************************/
#include "Interrupts.h"
#include <psx.h>
#include <stdint.h>
#include <stddef.h>
/* *************************************
* Defines
* *************************************/
#ifndef I_MASK
/*******************************************************************//**
*
* \brief Interrupt mask register.
*
* According to NoCash specifications, I_MASK bits are
* structured as follows:
*
* \arg Bit 0 IRQ0 VBLANK (PAL=50Hz, NTSC=60Hz)
* \arg Bit 1 IRQ1 GPU
* \arg Bit 2 IRQ2 CDROM
* \arg Bit 3 IRQ3 DMA
* \arg Bit 4 IRQ4 TMR0 Timer 0 aka Root Counter 0
* \arg Bit 5 IRQ5 TMR1 Timer 1 aka Root Counter 1
* \arg Bit 6 IRQ6 TMR2 Timer 2 aka Root Counter 2
* \arg Bit 7 IRQ7 Controller and Memory Card
* \arg Bit 8 IRQ8 SIO
* \arg Bit 9 IRQ9 SPU
* \arg Bit 10 IRQ10 Controller - Lightpen Interrupt
* \arg Bits 11-15 Not used (always zero)
* \arg Bits 16-31 Garbage
*
************************************************************************/
#define I_MASK (*(volatile unsigned int*)0x1F801074)
#endif /* I_MASK */
/* *************************************
* Types definition
* *************************************/
/* *************************************
* Global variables definition
* *************************************/
/* *************************************
* Local variables definition
* *************************************/
/* *************************************
* Local prototypes declaration
* *************************************/
/* *************************************
* Functions definition
* *************************************/
/*******************************************************************//**
*
* \brief Enables an interrupt source given by intSource.
*
* \param intSource
* HW interrupt source.
*
* \see \ref InterruptSource for a list of possible HW interrupt causes.
*
************************************************************************/
void InterruptsEnableInt(const enum InterruptSource intSource)
{
if (intSource < MAX_INTERRUPT_SOURCES)
{
/* Disable interrupts while I_MASK is modified. */
EnterCriticalSection();
/* Set bit for selected interrupt source. */
I_MASK |= 1 << intSource;
/* Re-enable interrupts. */
ExitCriticalSection();
}
else
{
/* Invalid selected InterruptSource instance. Exit. */
}
}
/*******************************************************************//**
*
* \brief Disables an interrupt source given by intSource.
*
* \param intSource
* HW interrupt source.
*
* \see \ref InterruptSource for a list of possible HW interrupt causes.
*
************************************************************************/
void InterruptsDisableInt(const enum InterruptSource intSource)
{
if (intSource < MAX_INTERRUPT_SOURCES)
{
/* Disable interrupts while I_MASK is modified. */
EnterCriticalSection();
/* Remove bit for selected interrupt source. */
I_MASK &= ~(1 << intSource);
/* Re-enable interrupts while I_MASK is modified. */
ExitCriticalSection();
}
else
{
/* Invalid selected InterruptSource instance. Exit. */
}
}
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