i.MX Processors中的主题 IM8MM: Need help for GPIO control

IM8MM: Need help for GPIO control

Suraj714 — Thu, 02 Nov 2023 15:49:32 GMT

Hi Expert!

We are using IMX8-mini device.

We are dealing with GPIO pins control.

On IMX8mini has gpio's that gpio5-8 and gpio5-9 pins.

We are trying to control that pins using command input. When we do gpioset -c gpiochip5 8=0 then status was not changing for that. Observed on gpioinfo status was not changed.

Used commands:

gpioset -c gpiochip5 8=0

gpioset -c gpiochip5 9=0

gpioset -c gpiochip5 9=1

gpioset -c gpiochip5 8=1

this above commands are used for gpio testing. also did activelow option using -l

When we observed on multimeter that value of supply voltage not changing. Supply voltage not changing means state are not working properly right?
Is there any option is there for to control gpio ? or anything we missed in process to test control ?

When we used below command it was changed status.

gpioset -c gpiochip5 -l 8=0

above command was terminated automatically we need to terminate is that right behavior?
Please share exact procedure for nxp chipset mini8mp gpio control test.

Thanks,

Suraj.

Re: IM8MM: Need help for GPIO control

JosephAtNXP — Fri, 03 Nov 2023 21:27:33 GMT

Hi,

Thank you for your interest in NXP Semiconductor products,

Did you add the GPIOs to the device tree and recompiled again? Could you share your device tree?

Regards

Re: IM8MM: Need help for GPIO control

ddbug — Sat, 04 Nov 2023 23:49:53 GMT

Use --mode=wait with gpioset commands. Because, gpioset allocates the gpio line and drives it only until it exits. Then the line is deallocated an returns to its defalt state.

Re: IM8MM: Need help for GPIO control

JosephAtNXP — Tue, 07 Nov 2023 18:00:35 GMT

Hi,

I don't see any DTS attached, you have to change it because they are UART3 flow control.

Which are used in EVK as UART flow control signals mapped to J1003.

In dtsi, they are used as UART 3 pins.

pinctrl_uart3: uart3grp { fsl,pins = < MX8MM_IOMUXC_ECSPI1_SCLK_UART3_DCE_RX 0x140 MX8MM_IOMUXC_ECSPI1_MOSI_UART3_DCE_TX 0x140 MX8MM_IOMUXC_ECSPI1_SS0_UART3_DCE_RTS_B 0x140 MX8MM_IOMUXC_ECSPI1_MISO_UART3_DCE_CTS_B 0x140 >; }; &uart3 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart3>; assigned-clocks = <&clk IMX8MM_CLK_UART3>; assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>; fsl,uart-has-rtscts; status = "okay"; };

If you made the changes properly, you should be able to set and clear the GPIO signals with these commands:

#command to turn off the led root@imx8mnevk:~# echo 0 >> /sys/class/leds/yellow\:status/brightness #command to turn on the led root@imx8mnevk:~# echo 1 >> /sys/class/leds/yellow\:status/brightness

Regards,