[Arm-netbook] Block Diagram EOMA-68 Handheld Games Console

[Miguel Garcia]

2014-09-05 13:48 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
> there are two EINT lines on EOMA68.  i suggest that one of them be
> connected to the AXP209, and the other to the STM32F072, although
> because there are only 2 this leaves some slight issue with the
> touchpanel to resolve (in linux kernel source, which will need
> modification).
>
> the problem is this: things like the touchpanel it is fairly essential
> (because you want to wake up the entire device based on an EINT) to
> have external interrupt.
>
> one alternative to modifying the linux kernel source is to have a NAND
> (NOR?) IC multiplexing multiple IRQ lines from various peripheral ICs
> onto the one EINT line.
>
> another alternative is to wire the AXP209 to the STM32F (on one of its
> GPIOs, then put that into EINT mode), then have the STM32F software
> generate a simple GPIO pull-up out to one of the EOMA68 EINTs.
>
> so instead of doing the multiplexing using a NAND (NOR) gate IC, you
> do it in software (firmware) instead.
>
> then you can do whatever you want, without modifying any linux kernel source.

Thanks.

And, what is your recommendation?

> * Headphone detect

What is the INT/IRQ pin here?

Thanks.