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