topic Re: How to set _nop() time in i.MX Processors

How to set _nop() time

ahhhhhhhhhhh — Wed, 20 Sep 2023 15:29:36 GMT

Hi Community,

I'm confused about the clock setting of RT1064. I want to use _nop() to have a delay, but I don't know how to calculate the delay time and what the clock the nop will use, and how to change the time of running one _nop() command?

I'm using the driver example program of GPT timer, and confused about the clock setting of this program.

Best Regards

Re: How to set _nop() time

Pavel_Hernandez — Wed, 20 Sep 2023 22:44:49 GMT

Hello, my name is Pavel, and I will be supporting your case, I suggest dot use the _nop() as delay, I recommend use a timer delay to get a better performance, in all the examples you can find the DOC file and documentation about the works of this.

Web: The simplest NOP statement in C is the null statement, which is just a semi-colon in a context requiring a statement.

Best regards,
Pavel

Re: How to set _nop() time

ahhhhhhhhhhh — Thu, 21 Sep 2023 01:14:23 GMT

Hi Pavel,

Thanks for your reply! I'm using a timer to get a interrupt for every 1s, and during the interrupt to have several nop for 100us, since I want to delay 100us for every 1s. When I use timer and count the interrupt number, it has some problems. So if do not use nop, Is there any solution to generate such signal?

Best regards

Iris

Re: How to set _nop() time

Pavel_Hernandez — Thu, 21 Sep 2023 21:49:51 GMT

Hello, sorry but that was not clear, could you elaborate further about what you want to do?

I understand the next: The interrupt is coming every 1s, but you want to delay 100us after that?

Best regards,
Pavel

Re: How to set _nop() time

ahhhhhhhhhhh — Fri, 22 Sep 2023 01:17:56 GMT

I want to generate a pulse train of 100us pulse width and 1Hz frequency using timer.

Best regards,

Iris

Re: How to set _nop() time

Pavel_Hernandez — Fri, 22 Sep 2023 22:55:58 GMT

Hello, I do not recommend using a timer, maybe the example of the PWM could help you, because the timer has a specific time, rather than the PWM you could be able to move the duty cycle on the same frequency.

Best regards,
Pavel

Re: How to set _nop() time

ahhhhhhhhhhh — Mon, 25 Sep 2023 13:19:07 GMT

Hello, actually I have already used the eFlexPWM to generate a pair of high frequency (250KHZ) complementary PWM, and I want to make this PWM signal as the burst output, it means that the complementary PWM signal will output for 100us and then output low level voltage for 1s. And I don't know how to use another low frequency PWM(1HZ with 100us positive pulse width) to trigger this pair of high frequency complementary PWM signal, so I use timer to make it enable and disable for every 100us and 1s.

Best regards,

Iris

Re: How to set _nop() time

Pavel_Hernandez — Thu, 05 Oct 2023 22:11:44 GMT

Hello,

Could please create a new question in the community as the information is different from the original post on this thread?

Best regards,
Pavel