Strange tim4 interrupts?

[hpare]

The chip is stm8s103f3p6, and I wanna use lsi as clk and tim4 to make a timer, there are two strange things happened.

​

1. when I set prescaler to TIM4_PRESCALER_4 and ARR to 32, I thought it should interrupt every 1ms (128k/4/32=1kHz), but it seems break every 2ms.
2. when I set prescaler to TIM4_PRESCALER_4 and ARR to 16, it always freezes at enableInterrupts() ...

​

I have already set LSI_EN to enable, can anyone help find what happened?

Thx

​

the code:

unsigned long elapseTime = 0;
 
 
void DelayMS(unsigned int ms) {
 unsigned long lmttime = elapseTime + ms;
 while(lmttime >= elapseTime);
 return;
}
 
int main( void )
{
 CLK_DeInit();
 
 CLK_LSICmd(ENABLE);
 CLK_ClockSwitchConfig(CLK_SWITCHMODE_MANUAL, CLK_SOURCE_LSI, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE);
 while(CLK_GetFlagStatus(CLK_FLAG_LSIRDY)==RESET);
 CLK_ClockSwitchCmd(ENABLE); 
 while(CLK_GetSYSCLKSource() != CLK_SOURCE_LSI){
 }
 
 TIM4_DeInit();
 TIM4_TimeBaseInit(TIM4_PRESCALER_4, 32);
 TIM4_ITConfig(TIM4_IT_UPDATE, ENABLE);
 TIM4_SetCounter(0x00);
 TIM4_Cmd(ENABLE);
 
 
 GPIO_DeInit(GPIOB);
 GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_LOW_SLOW);
 
 GPIO_WriteReverse(GPIOB, GPIO_PIN_5);
 
 enableInterrupts();
 
 while (1) {
 DelayMS(2000);
 GPIO_WriteReverse(GPIOB, GPIO_PIN_5);
 }
 
 return 0;
}
 
 INTERRUPT_HANDLER(TIM4_UPD_OVF_IRQHandler, 23)
 {
 elapseTime++;
 TIM4_ClearITPendingBit(TIM4_IT_UPDATE);
 }

​

​

[AAntu.1781]

Hello, I have the same problem. Managed to solve?