nested interrupts

sorry for previous one .

#define I_Bit                   0x80
#define F_Bit                   0x40
#define SYS32Mode               0x1F
#define IRQ32Mode               0x12
#define FIQ32Mode               0x11
static DWORD sysreg;            /* used as LR register */

//#define IENABLE __asm { MRS sysreg, SPSR; MSR CPSR_c, #SYS32Mode }
//#define IDISABLE __asm { MSR CPSR_c, #(IRQ32Mode|I_Bit); MSR SPSR_cxsf, sysreg }

the above results in hanging.

sorry for previous one .

#define I_Bit                   0x80
#define F_Bit                   0x40
#define SYS32Mode               0x1F
#define IRQ32Mode               0x12
#define FIQ32Mode               0x11
static DWORD sysreg;            /* used as LR register */

//#define IENABLE __asm { MRS sysreg, SPSR; MSR CPSR_c, #SYS32Mode }
//#define IDISABLE __asm { MSR CPSR_c, #(IRQ32Mode|I_Bit); MSR SPSR_cxsf, sysreg }

the above results in hanging.

sorry for previous one

#define I_Bit                   0x80
#define F_Bit                   0x40
#define SYS32Mode               0x1F
#define IRQ32Mode               0x12
#define FIQ32Mode               0x11
static DWORD sysreg;            /* used as LR register */

#define IENABLE __asm { MRS sysreg, SPSR; MSR CPSR_c, #SYS32Mode }
#define IDISABLE __asm { MSR CPSR_c, #(IRQ32Mode|I_Bit); MSR SPSR_cxsf, sysreg }

this results in hanging

keshan,
how can anybody help you when you consistently fail to provide full details! now you posted commented code. post the implementation - how you USED there macros and where.

#define I_Bit                   0x80
#define F_Bit                   0x40
#define SYS32Mode               0x1F
#define IRQ32Mode               0x12
#define FIQ32Mode               0x11
static DWORD sysreg;            /* used as LR register */

#define IENABLE __asm { MRS sysreg, SPSR; MSR CPSR_c, #SYS32Mode }
#define IDISABLE __asm { MSR CPSR_c, #(IRQ32Mode|I_Bit); MSR SPSR_cxsf, sysreg }

void PWMHandler (void) __irq
{
  DWORD regVal;

  IENABLE;                              /* handles nested interrupt */
  regVal = PWM0IR;
  if ( regVal & MR0_INT )
  {
        match_counter0++;
  }
  PWM0IR |= regVal;             /* clear interrupt flag on match 0 */

  regVal = PWM1IR;
  if ( regVal & MR0_INT )
  {
        match_counter1++;
  }
  PWM1IR |= regVal;             /* clear interrupt flag on match 0 */
  IDISABLE;
  VICVectAddr = 0;              /* Acknowledge Interrupt */
  return;
}

Hi Keshan,

the macros you are trying to use to get nested interrupts don't really work. ARM provides a document called "Exception_Handling.ppt" which explains in detail how to handle nested interrupts.
I can tell you that you can not use the compiler provided interrupt interface "__irq" to fulfill the ARM requirements. You may have to implement your own assembly interface for nested interrupts and write your high-level handlers in C or C++.

Frank