samisr.c

S64和VS1003的MP3播放实现的源代码/

#ifdef AT91SAM7S32
#include "AT91SAM7S32.h"
#include "lib_AT91SAM7S32.h"
#endif

#ifdef AT91SAM7S64
#include "AT91SAM7S64.h"
#include "lib_AT91SAM7S64.h"
#endif

volatile unsigned int Spurious_IRQ_cnt = 0;

typedef void (*SAM_ISR)(void);

void OS_CPU_IRQ_ISR_Handler(void)
{
    SAM_ISR SAM_irq = (void(*)(void))(AT91C_BASE_AIC->AIC_IVR);
    AT91C_BASE_AIC->AIC_IVR = 0;                        /* Debug variant of IVR (protect mode is used)*/

    SAM_irq();
  
    AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC); /* end of IRQ */
}

void OS_CPU_FIQ_ISR_Handler(void)
{
    SAM_ISR SAM_fiq = (void(*)(void))(AT91C_BASE_AIC->AIC_FVR);
    AT91C_BASE_AIC->AIC_IVR = 0;                        /* Debug variant of IVR (protect mode is used)*/

    SAM_fiq();

    AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC); /* end of FIQ */
}

void SAMdefaultISR(void)
{
    AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
}

void SAMspuriousISR(void)
{
    Spurious_IRQ_cnt ++;
    AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
}

//*----------------------------------------------------------------------------
//* \fn    SAM_AIC_IVR_Init
//* \brief disable all interrupt, install default ISR & SPU_ISR
//*----------------------------------------------------------------------------
void SAM_AIC_IVR_Init(void)
{
    signed int vect = 32;

    for (; vect; vect--)
    {
        AT91F_AIC_DisableIt(AT91C_BASE_AIC, vect);
        /* 
        AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, vect, AT91C_AIC_PRIOR_LOWEST, 
                              AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE, 
                              SAMdefaultISR);
        */
        AT91C_BASE_AIC->AIC_SVR[vect] = (unsigned int)SAMdefaultISR;
    }
   
    AT91C_BASE_AIC->AIC_SPU = (unsigned int)SAMspuriousISR;
    AT91C_BASE_AIC->AIC_DCR = AT91C_AIC_DCR_PROT; /* AIC protect mode */
}