topic Re: GPIO Pin Up-Down in i.MX Processors

GPIO Pin Up-Down

Nirjul_Patel — Fri, 25 Mar 2022 06:48:39 GMT

Hello,

We Want A GPIO Pin Up-down time is nanosecond As Per our Application Requirement . But Now We Create a GPIO Driver module and use this module throughout GPIO pin up-down take 8 millisecond, So Can You Explain how to we achieve GPIO Pin up-down time in 8 millisecond to 1-5 nanosecound.

And we try to Add Clock-frequency in .dts file then time take also 8 millisecond,

Change in .dts File

gpioctr_device {
compatible = "myir,gpioctr";
clock-frequency = <1000000000>;
status = "okay";
gpioctr-gpios = <&gpio3 21 0>;
};

Re: GPIO Pin Up-Down

josephzhou1 — Sat, 26 Mar 2022 08:51:24 GMT

Nirjul_Patel

: r u a pure software engineer or have some triple E backgrd?

1-5 nanosecound?

i not heard that faster in a MCU GPIO , it is impossible ：1 machine clock also need 3--12 timer clocks right? hardware also cannot support right?

i.MX 8 series

Name Clock speed CPU cores

i.MX 8 QuadMax	1.2 GHz + 1.6 GHz	4× Cortex-A53 + 2× Cortex-A72
i.MX 8 QuadPlus	1.2 GHz + 1.6 GHz	4× Cortex-A53 + 1× Cortex-A72
i.MX 8 DualMax	1.6 GHz	2× Cortex-A72

thanks

Re: GPIO Pin Up-Down

Nirjul_Patel — Mon, 28 Mar 2022 06:00:02 GMT

Hello@josephzhou1

I am pure Software Engineer

And I use i.mx8mm processor board I want to know minimum time of GPIO pin up-down?
And Which factor affect On GPIO pin Up-down time ?
I want know how to set clock-frequency on particular GPIO pin?

Re: GPIO Pin Up-Down

Aubineau_FAE — Mon, 28 Mar 2022 11:31:30 GMT

Hi,

Max GPIOs frequency is in the datasheet:

If you want to output a clock, you have CLKOUT1 & CLKOUT2 pins for this purpose, as described in the reference manual:

/BR

Vincent

Re: GPIO Pin Up-Down

Nirjul_Patel — Thu, 31 Mar 2022 05:00:18 GMT

Hello,

I changed a clock-frequency in dts file for particular pin, .dts file format is given below

gpioctr_device {
              compatible = "myir,gpioctr";
              status = "okay";
              clock-frequency = <4000000>;
              gpioctr-gpios = <&gpio3 21 0>;

}

if i change clock frequency then gpio pin up-down time will change or not???
and my second question is how to decrease a gpio toggle time???

GPIO Pin Up-Down

josephzhou1 — Sat, 09 Apr 2022 03:23:39 GMT

Nirjul_Patel

: r u a pure software engineer or have some triple E backgrd?

1-5 nanosecound?

i not heard that faster in a MCU GPIO , it is impossible ：1 machine clock also need 3--12 timer clocks right? hardware also cannot support right?

i.MX 8 series

Name Clock speed CPU cores

i.MX 8 QuadMax	1.2 GHz + 1.6 GHz	4× Cortex-A53 + 2× Cortex-A72
i.MX 8 QuadPlus	1.2 GHz + 1.6 GHz	4× Cortex-A53 + 1× Cortex-A72
i.MX 8 DualMax	1.6 GHz	2× Cortex-A72

thanks