Arm Assembly Timer İnterrupt

[Bicer]

Hi everyone

I'm trying to write the timer interrupt code I wrote in C (pa3 pin blinks at 10 ms intervals) with arm assembly language, but it doesn't work.I don't know exactly how to do the timer interrupt in assembly language.I tried to write my own code by looking at the disassembly feature from keil uvision. So where am I doing wrong? (I'm using stm32f103c8)

C code:

#include "stm32f10x.h"
 
void TIM2_IRQHandler()
{
	TIM2->SR =0x00;
	GPIOA->ODR ^=0x0008;//toggle pa3
}
 
int main(void)
{
	RCC->APB2ENR = 0x04; /// port a
	GPIOA->CRL   = 0x00003000; 
	__disable_irq();
	RCC->APB1ENR =0x1;// timer2 
	TIM2->ARR = 0xffff; 
	TIM2->PSC = 0x36;  // 10hz  
	TIM2->DIER = 0x1;// (OVERFLOW) 
	TIM2->CR1 = 0x1; // TIMx_CR1.CEN
	NVIC_EnableIRQ(TIM2_IRQn);
	__enable_irq();
	while(1)
	{
   		
	}
}

Assembly code

EXPORT Program
 
GPIOA_IDR	       EQU 0x40010808
 
GPIOA_CRL	       EQU 0x40010800
GPIOB_IDR	       EQU 0x40010C08
GPIOA_ODR	       EQU 0x4001080C
RCC_APB2ENR        EQU 0x40021000
RCC_APB1ENR        EQU 0x40021000
TIM2_ARR           EQU 0x4000002C
TIM2_PSC           EQU 0x40000028
TIM2_DIER          EQU 0x4000000C
TIM2_CR1           EQU 0x40000000
TIM2_SR            EQU 0x40000010
 
		           AREA start, CODE, READONLY			  
timer_             MOVS     r0,#0x00
8372               MOV      r1,#0x40000000
8376               STRH     r0,[r1,#0x10]
8378               LDR      r0,=GPIOA_ODR  
8371               LDR      r0,[r0,#0x00]
8372               EOR      r0,r0,#0x08
8380               LDR      r1,=GPIOA_ODR  
8382               STR      r0,[r1,#0x00] 
                   ADDS     R7,R7,#1		 ;counter for debugging    		   
8384               BX       LR
Program		       MOVS     r0,#0x04
8385               LDR      r1,=RCC_APB2ENR  
8390               STR      r0,[r1,#0x18]
     ; pa3 out
                   MOV      r0,#0x3000
                   LDR      r1,=GPIOA_CRL  
                   STR      r0,[r1,#0x00]
 
                   ADDS     R11,R11,#1  
                   CPSID    I 
                   MOVS     r0,#0x01
                   LDR      r1,=RCC_APB1ENR  
                   STR      r0,[r1,#0x1C]
    ;        TIM2->ARR = 0xffff;  
                   MOVW     r0,#0xFFFF
                   LSLS     r1,r1,#18
                   STRH     r0,[r1,#0x2C]
    ;         TIM2->PSC = 54;  
                   MOVS     r0,#0x36
                   STRH     r0,[r1,#0x28]
    ;        TIM2->DIER = 0x1; 
                   MOVS     r0,#0x01
                   STRH     r0,[r1,#0x0C]
    ;         TIM2->CR1 = 0x1;  
                   STRH     r0,[r1,#0x00]
                   MOVS     r0,#0x1C
 
                   BL       timer_
                   CMP      r0,#0x00
                   BLT      interrupt ;
     	           NOP
     	           NOP
                   AND      r2,r0,#0x1F
                   MOVS     r1,#0x01
                   LSLS     r1,r1,r2
                   LSRS     r2,r0,#5
                   LSLS     r2,r2,#2
                   ADD      r2,r2,#0xE000E000
                   STR      r1,[r2,#0x100]
                   ADDS     R8,R8,#1      ;counter for debugging     
    	           NOP
interrupt 	       NOP
                   ADDS     R5,R5,#1   ;counter for debugging                 
            	   MOVS     R6,#0x3    ;control 
                   CPSIE    I
    	           NOP
while              B        while	 
                   MOVS     R6,#0x7
			       ALIGN
	               END