PROCESSOR-SDK-AM62P: How to control GPIO in SDK10 (Kernel 6.6)

YuYuan Wang

Tool/software:

I got an error by controlling the GPIO by libgpiod
I can detect GPIO by gpiodetect

root@am62pxx-evm:~# gpiodetect
gpiochip0 [1-0023] (24 lines)
gpiochip1 [600000.gpio] (92 lines)
gpiochip2 [601000.gpio] (52 lines)
gpiochip3 [1-0022] (24 lines)

For example, if I want to set GPIO0_5 pin to high

I need to issue the command "gpioset gpiochip1 5=1"

but I got the following error

root@am62pxx-evm:~# gpioset gpiochip1 5=1
gpioset: invalid line value: 'gpiochip1'
root@am62pxx-evm:~# gpioinfo gpiochip1
gpioinfo: cannot find line 'gpiochip1'

My DTS has configured the pin.

&main_pmx0 {
	bootph-all;
	gpio_pins_default: gpio-default-pins {
		pinctrl-single,pins = <
			AM62PX_IOPAD(0x0014, PIN_OUTPUT, 7) /* (N25) OSPI0_D2.GPIO0_5 LCD_RGB_VLED_EN */
	};
};

&main_gpio0 {
	bootph-all;
};

Does somebody know how to control the GPIO?

over 1 year ago

+1 Anshu Madwesh over 1 year ago

TI__Mastermind 19385 points

Hello,

In SDK 10.0 using Linux Kernel 6.6, the community changed the gpiod userspace commands slightly. If you check gpioset --help, you'll see that you need -c flag to indicate which gpiochip will be used.

Thanks,

Anshu

0 YuYuan Wang over 1 year ago in reply to Anshu Madwesh

Prodigy 180 points

Hi Anshu,

Sorry, I found I still cannot change the output value

It will hang when I issue the command "gpioset -c gpiochip1 5=1"

0 Anshu Madwesh over 1 year ago in reply to YuYuan Wang

TI__Mastermind 19385 points

Hello,

Does sending an interrupt with 'ctrl + c' not end the hang?

Thanks,

Anshu

0 YuYuan Wang over 1 year ago in reply to Anshu Madwesh

Prodigy 180 points

Hi Anshu,

Yes, I can end the hang by "ctrl+c". It seems that gpioset not returning is normal behavior.

Thanks for your reply.

0 Anshu Madwesh over 1 year ago in reply to YuYuan Wang

TI__Mastermind 19385 points

Hello,

Does this GPIO have a line name defined in the device tree? If so, you can directly call the line name.

If not, you can try adding the --unquoted flag after gpioset command.

Thanks,
Anshu