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RTC_IRQHandler never entered

Hi everybody,

I want to use the the RTC (Real Time Counter) interrupt in my code. To do it, I need to program the associated RTC_IRQHandler function which is declared in the startup-ARMC0plus.s file.

;/**************************************************************************//**
; * @file     startup_ARMCM0plus.s
; * @brief    CMSIS Core Device Startup File for
; *           ARMCM0plus Device Series
; * @author    S.Wright
; * @version   v1.1.0
; * @date      2018/06/19
; * @attention changes from original startup_ARMCM0plus.s are copyright: 2016..2018, Cobham AES
; *
; * @note
; *
; ******************************************************************************/
;/* Copyright (c) 2012 ARM LIMITED
;
;   All rights reserved.
;   Redistribution and use in source and binary forms, with or without
;   modification, are permitted provided that the following conditions are met:
;   - Redistributions of source code must retain the above copyright
;     notice, this list of conditions and the following disclaimer.
;   - Redistributions in binary form must reproduce the above copyright
;     notice, this list of conditions and the following disclaimer in the
;     documentation and/or other materials provided with the distribution.
;   - Neither the name of ARM nor the names of its contributors may be used
;     to endorse or promote products derived from this software without
;     specific prior written permission.
;   *
;   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
;   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;   ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
;   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
;   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
;   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
;   POSSIBILITY OF SUCH DAMAGE.
;   ---------------------------------------------------------------------------*/
;/*
;//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
;*/


; <h> Stack Configuration
;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

; Stack_Size      EQU     0x00000400   #### TEST ONLY -- S.Wright, 2017/10/12
Stack_Size      EQU     0x00000800

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem       SPACE   Stack_Size
__initial_sp


; <h> Heap Configuration
;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

; Heap_Size       EQU     0x00000C00
Heap_Size       EQU     0x00001000                 ; #### TEST ONLY -- S.Wright, 2017/07/06

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit


                PRESERVE8
                THUMB


; Vector Table Mapped to Address 0 at Reset

                AREA    RESET, DATA, READONLY
                EXPORT  __Vectors
                EXPORT  __Vectors_End
                EXPORT  __Vectors_Size

__Vectors      ; Reset SP/vector

                DCD     __initial_sp              ; -16: Top of Stack
                DCD     Reset_Handler             ; -15: Reset Handler

                ; Internal Interrupts

                DCD     NMI_Handler               ; -14: NMI Handler
                DCD     HardFault_Handler         ; -13: Hard Fault Handler
                DCD     0                         ; -12: reserved
                DCD     0                         ; -11: reserved
                DCD     0                         ; -10: reserved
                DCD     0                         ;  -9: reserved
                DCD     0                         ;  -8: reserved
                DCD     0                         ;  -7: reserved
                DCD     0                         ;  -6: reserved
                DCD     SVC_Handler               ;  -5: SVCall Handler
                DCD     0                         ;  -4: reserved
                DCD     0                         ;  -3: reserved
                DCD     PendSV_Handler            ;  -2: PendSV Handler
                DCD     SysTick_Handler           ;  -1: SysTick Handler

                ; External Interrupts: UT32M0R500-specific

                DCD     MBEA_IRQHandler           ;   0: MBEA
                DCD     DUALTIMER0_IRQHandler     ;   1: DualTimer0
                DCD     DUALTIMER1_IRQHandler     ;   2: DualTimer1
                DCD     PWM_IRQHandler            ;   3: PWM
                DCD     RTC_IRQHandler            ;   4: RTC
                DCD     GPIO0_16_IRQHandler       ;   5: GPIO16 [GPIO1, Pin 0]
                DCD     GPIO0_17_IRQHandler       ;   6: GPIO17 [GPIO1, Pin 1]
                DCD     GPIO0_18_IRQHandler       ;   7: GPIO18 [GPIO1, Pin 2]
                DCD     GPIO0_19_IRQHandler       ;   8: GPIO19 [GPIO1, Pin 3]
                DCD     GPIO0_20_IRQHandler       ;   9: GPIO20 [GPIO1, Pin 4]
                DCD     GPIO0_21_IRQHandler       ;  10: GPIO21 [GPIO1, Pin 5]
                DCD     GPIO0_22_IRQHandler       ;  11: GPIO22 [GPIO1, Pin 6]
                DCD     GPIO0_23_IRQHandler       ;  12: GPIO23 [GPIO1, Pin 7]
                DCD     Default_Handler           ;  13: reserved
                DCD     UART0_IRQHandler          ;  14: UART0
                DCD     UART1_IRQHandler          ;  15: UART1
                DCD     CAN0_IRQHandler           ;  16: CAN0
                DCD     CAN1_IRQHandler           ;  17: CAN1
                DCD     I2C0_IRQHandler           ;  18: I2C0
                DCD     I2C1_IRQHandler           ;  19: I2C1
                DCD     SPI_IRQHandler            ;  20: SPI
                DCD     ADC_IRQHandler            ;  21: ADC
                DCD     GPIO0_ALL_IRQHandler      ;  22: GPIO0 combined
                DCD     GPIO1_ALL_IRQHandler      ;  23: GPIO1 combined
                DCD     GPIO2_ALL_IRQHandler      ;  24: GPIO2 combined
                DCD     Default_Handler           ;  25: reserved
                DCD     Default_Handler           ;  26: reserved
                DCD     Default_Handler           ;  27: reserved
                DCD     Default_Handler           ;  28: reserved
                DCD     Default_Handler           ;  29: reserved
                DCD     Default_Handler           ;  30: reserved
                DCD     Default_Handler           ;  31: reserved
__Vectors_End

__Vectors_Size  EQU     __Vectors_End - __Vectors

                AREA    |.text|, CODE, READONLY


; Reset Handler

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  SystemInit
                IMPORT  __main
                LDR     R0, =SystemInit
                BLX     R0
                LDR     R0, =__main
                BX      R0
                ENDP


; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler     PROC
                EXPORT  NMI_Handler               [WEAK]
                B       .
                ENDP
HardFault_Handler\
                PROC
                EXPORT  HardFault_Handler         [WEAK]
                B       .
                ENDP
SVC_Handler     PROC
                EXPORT  SVC_Handler               [WEAK]
                B       .
                ENDP
PendSV_Handler  PROC
                EXPORT  PendSV_Handler            [WEAK]
                B       .
                ENDP
SysTick_Handler PROC
                EXPORT  SysTick_Handler           [WEAK]
                B       .
                ENDP

Default_Handler PROC

                EXPORT MBEA_IRQHandler           [WEAK]
                EXPORT DUALTIMER0_IRQHandler     [WEAK]
                EXPORT DUALTIMER1_IRQHandler     [WEAK]
                EXPORT PWM_IRQHandler            [WEAK]
                EXPORT RTC_IRQHandler            [WEAK]
                EXPORT GPIO0_16_IRQHandler       [WEAK]
                EXPORT GPIO0_17_IRQHandler       [WEAK]
                EXPORT GPIO0_18_IRQHandler       [WEAK]
                EXPORT GPIO0_19_IRQHandler       [WEAK]
                EXPORT GPIO0_20_IRQHandler       [WEAK]
                EXPORT GPIO0_21_IRQHandler       [WEAK]
                EXPORT GPIO0_22_IRQHandler       [WEAK]
                EXPORT GPIO0_23_IRQHandler       [WEAK]
                EXPORT UART0_IRQHandler          [WEAK]
                EXPORT UART1_IRQHandler          [WEAK]
                EXPORT CAN0_IRQHandler           [WEAK]
                EXPORT CAN1_IRQHandler           [WEAK]
                EXPORT I2C0_IRQHandler           [WEAK]
                EXPORT I2C1_IRQHandler           [WEAK]
                EXPORT SPI_IRQHandler            [WEAK]
                EXPORT ADC_IRQHandler            [WEAK]
                EXPORT GPIO0_ALL_IRQHandler      [WEAK]
                EXPORT GPIO1_ALL_IRQHandler      [WEAK]
                EXPORT GPIO2_ALL_IRQHandler      [WEAK]

MBEA_IRQHandler
DUALTIMER0_IRQHandler
DUALTIMER1_IRQHandler
PWM_IRQHandler
RTC_IRQHandler
GPIO0_16_IRQHandler
GPIO0_17_IRQHandler
GPIO0_18_IRQHandler
GPIO0_19_IRQHandler
GPIO0_20_IRQHandler
GPIO0_21_IRQHandler
GPIO0_22_IRQHandler
GPIO0_23_IRQHandler
UART0_IRQHandler
UART1_IRQHandler
CAN0_IRQHandler
CAN1_IRQHandler
I2C0_IRQHandler
I2C1_IRQHandler
SPI_IRQHandler
ADC_IRQHandler
GPIO0_ALL_IRQHandler
GPIO1_ALL_IRQHandler
GPIO2_ALL_IRQHandler

                B       .

                ENDP


                ALIGN


; User Initial Stack & Heap

                IF      :DEF:__MICROLIB

                EXPORT  __initial_sp
                EXPORT  __heap_base
                EXPORT  __heap_limit

                ELSE

                IMPORT  __use_two_region_memory
                EXPORT  __user_initial_stackheap

__user_initial_stackheap PROC
                LDR     R0, =  Heap_Mem
                LDR     R1, =(Stack_Mem + Stack_Size)
                LDR     R2, = (Heap_Mem +  Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR
                ENDP

                ALIGN

                ENDIF


                END

First, I initialized the RTC in a counter.c file as follow. It wrap when it reaches 0x1FFFFFFF and the interruption must be risen.

#define C_RTC_PLACE_BIT_3                     3
#define C_RTC_PLACE_BIT_2                     2
#define C_RTC_PLACE_BIT_1                     1
#define C_RTC_PLACE_BIT_0                     0
													                    
													                    
#define C_INIT_RTC_WEN                        1 // RTC wrap enable
#define C_INIT_RTC_EN                         1 // Start RTC
#define C_INIT_RTC_MASK                       0 // no mask on interrupts
#define C_INIT_RTC_IEN                        1 // interrupts enable



#define C_INIT_COUNTER_CONTROL_MASK           ((C_INIT_RTC_WEN<<C_RTC_PLACE_BIT_3) | (C_INIT_RTC_EN<< C_RTC_PLACE_BIT_2) | (C_INIT_RTC_MASK<<C_RTC_PLACE_BIT_1)  | (C_INIT_RTC_IEN<<C_RTC_PLACE_BIT_0) )


void counterInit(void)
{
	NVIC_SetPriority (RTC_IRQn, 0);
	NVIC_EnableIRQ(RTC_IRQn);
	
	s_counter->counterMatchRegister = 0x1FFFFFFF;
	s_counter->counterControlRegister = C_INIT_COUNTER_CONTROL_MASK;

}

I also programmed the RTC_IRQHandler in the same file

void RTC_IRQHandler(void);
void RTC_IRQHandler(void)  
{
	volatile t_int32u l_readEOIRegister;
	
	s_extraBitsCounter++;                                  // increment a counter
	l_readEOIRegister = s_counter->endOfInterruptRegister; // read EOI register to clear it
	
	NVIC_ClearPendingIRQ(RTC_IRQn);
}

However, when the counter wraps, the interrupts is risen but the program never enter the RTC_IRQHandler function.

What could be wrong ?

Thank you for your help.

Best regards.

Rémi G.