Disable EFM8UB1 Timer4

03/77/2021 | 08:41 PM

Hello,

I have a rather dumb problem. For my application I need to enable/disable Timer 4 at the EFM8UB1 via firmware.

The code for contorlling the timer is rather simple, as shown below.

void set_timer(bool enable)
{
	uint8_t TMR4CN0_TR4_save;
	SFRPAGE = 0x10;
	TMR4CN0_TR4_save = TMR4CN0 & TMR4CN0_TR4__BMASK;
	if(enable==true) TMR4CN0 |= TMR4CN0_TR4__RUN;
	else TMR4CN0 |= TMR4CN0_TR4__STOP;
	TMR4CN0 |= TMR4CN0_TR4_save;
}

However, I am able to start the timer. This can be confirmed as the Timer4 ISR is hit. But I can't stop the timer. If I call my function with enable=false the Timer 4 ISR is still getting triggered.

Am I missing a dedicated procedure for disabling a timer?

Best regards,

Todor

Answered

neuhaus

Replied 36 days ago

Hi,

Keep it simple:

TMR4CN0 &= ~TMR4CN0_TR4__RUN;

TMR4CN0_TR4__STOP is defines as 0x00.

You cannot "or" with a "0", nothing will happen, you have to "and" it. then you can turn the bit to "0".

regards Karl

Correct Answer

0

Replied 36 days ago

How about this?

void set_timer(bool enable)
{
	uint8_t TMR4CN0_TR4_save;
	TMR4CN0_TR4_save = TMR4CN0;

	SFRPAGE = 0x10;

	if(enable==true) 
		TMR4CN0_TR4_save |= TMR4CN0_TR4__RUN;
	else 
		TMR4CN0_TR4_save &= ~TMR4CN0_TR4__RUN;

	TMR4CN0 |= TMR4CN0_TR4_save;
}

Todor Krastev

Replied 35 days ago

Thank you ver much!

Sometimes I wonder how I got my masters degree...

0
delu

Employee

Replied 25 days ago

You are welcome, please let us know if you have other question.

0

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Disable EFM8UB1 Timer4