GPIO latch in T1022

[hemwant]

I am having a T1022 processor based board, one of the gpio signal GPIO3_31 is by default configured as output , i wanted it to be configured as GPIO3_31 as input. I have made the changes via GPIO direction register. But on giving reset to processor the pin again gets configured as output. Is there some way i can latch the value of the respective pin or modify the default configuration of the pin so that after reboot/reset of the same , the port pin configuration remains same as done at time of reboot/reset.

[Bulat]

All GPIO direction registers of the T1022 are set to 0x0 at reset (default value), so all GPIO ports are set as inputs. If you see that GPIO3_31 is set as an output, it was configured somewhere in boot code or PBL.

Regards,

Bulat

[hemwant]

@Bulatyes the GPIO3_31 is configured as input by default when processor is given reset. I want it to be in output mode when it gets reset from linux. Is there some way to do that, so that i can retain the state of GPIO3_31 after reset?

[Bulat · Accepted solution]

As I wrote, all GPIO pins are configured as inputs at reset. This is a hardware feature and can not be changed. You can re-configure direction of GPIO pins in the boot code if you need.

Regards,

Bulat