dose atmel micro hase buge?

perhaps you can find some little error in our program but none of them doesn't about our problem!!

perhaps you can find some little error in our program but none of them doesn't about our problem!!

and some important part of our start up:

UND_Stack_Size      EQU     0x00000000
SVC_Stack_Size      EQU     0x00000100
ABT_Stack_Size      EQU     0x00000000
FIQ_Stack_Size      EQU     0x00000000
IRQ_Stack_Size      EQU     0x00000080
USR_Stack_Size      EQU     0x00000400


IRQ_Handler
     ldr r14, =AT91C_BASE_AIC
    ; ldr r0, [r14, #AIC_IVR]
     ;bx r0

         ;sub r14, r14, #4
     ;stmfd sp!, {r0-r3, r12, r14}
     ;ldr r14, =AT91C_BASE_AIC
     ;ldr r0, [r14, #AIC_IVR]
     ;bx        r0

        ; ldr r14, =AT91C_BASE_AIC
    ; str r14, [r14, #AIC_EOICR]
    ; ldmfd sp!, {r0-r3, r12, pc}^
      ;Save interrupt context on the stack to allow nesting */
      SUB     lr, lr, #4
      STMFD   sp!, {lr}
      MRS     lr, SPSR
      STMFD   sp!, {r0,r1,lr}

     ; Write in the IVR to support Protect Mode */
      LDR     lr, =AT91C_BASE_AIC
      LDR     r0, [r14, #AIC_IVR]
      STR     lr, [r14, #AIC_IVR]

        ; Branch to interrupt handler in Supervisor mode */
       MSR     CPSR_c, #ARM_MODE_SVC
       STMFD   sp!, {r1-r4, r12, lr}
       MOV     lr, pc
       BX      r0
       LDMIA   sp!, {r1-r4, r12, lr}
       MSR     CPSR_c, #ARM_MODE_IRQ | I_BIT

        ; Acknowledge interrupt */
        LDR     lr, =AT91C_BASE_AIC
        STR     lr, [r14, #AIC_EOICR]

        ; Restore interrupt context and branch back to calling code
        LDMIA   sp!, {r0,r1,lr}
        MSR     SPSR_cxsf, lr
        LDMIA   sp!, {pc}^

; Reset Handler

                EXPORT  Reset_Handler