LPC MicrocontrollersのトピックRe: SC-TIMER Handler problem

SC-TIMER Handler problem

VIGNESH_BABU — Wed, 31 Jul 2024 10:18:27 GMT

Hi,

In LPC55S16 Microcontroller ,where using Sc-timer to generate the PWM pluses with the certain intervals.But in Handler it react differently.For example if I give 3 count it generate the 3 Pluses but it generate one pluses.References here I below attached image for the references.Thank you.

Re: SC-TIMER Handler problem

Alice_Yang — Thu, 01 Aug 2024 01:39:41 GMT

Hello @VIGNESH_BABU

Could you please describe your project and requirement more detail?

" I give 3 count it generate the 3 Pluses but it generate one pluses."

->> Please give more description about this, thanks.

Also there is PWM demo under SDK, you can firstly refer to it.

And you can use configuration tool to configure.

Alice

Re: SC-TIMER Handler problem

VIGNESH_BABU — Thu, 01 Aug 2024 07:26:15 GMT

Hi,

" I give 3 count it generate the 3 Pluses but it generate one pluses."

Detailed description:

Hi,

Here we working on SC Timer to generate the pulses in various duty cycle with the pulse period of 1200 ns. We verified the SDK example which generate proper duty cycle as the requirement.

Here i need some clarification on Handler call back. For one pulse(ON&OFF) generation using SC-Timer, how many times the Handler will call?

Why because, while we look on this, Handler is called for 3 times for a single pulse(ON&OFF) generation.

Here is the configuration we done for the pulse generation using SC-Timer is attached.

Is any EVENT/STATE configuration need to be done for single Handler callback for every pulse generation? (or) It is a standard handler callback?

Re: SC-TIMER Handler problem

Alice_Yang — Sun, 04 Aug 2024 09:31:19 GMT

Hello @VIGNESH_BABU

Thanks for your reply.

Handler should be called 1 time for a single pulse(ON&OFF) generation. How about first testing the SDK demo "lpcxpresso55s16_sctimer_pwm_with_dutycyle_change" on your side. See how many interrupts handler be called for each PWM pulse.

On demo code, enable SCTIMER PWM interrupt code:

/* Enable interrupt flag for event associated with out 4, we use the interrupt to update dutycycle */
 SCTIMER_EnableInterrupts(SCT0, (1 << eventNumberOutput));
 
/* Receive notification when event is triggered */
 SCTIMER_SetCallback(SCT0, SCTIMER_LED_HANDLER, eventNumberOutput);
 
/* Enable at the NVIC */
 EnableIRQ(SCT0_IRQn);
 
 
 
If this demo works well on your board. Please refer to the code development yours.
 
BR
Alice