[Arm-netbook] IC for analog and digital buttons (EOMA-68)

[Miguel Garcia]

2014-08-07 10:13 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
>  blegh - and you need 2 of them _and_ 2 analog ICs as well. that's
> starting to make the STM32F103 (64-pin variant) look attractive.  and
> i know you can get that at around the $2.50 mark in 10k volumes.
>
>  *sigh* ok do you really need that USB Flash thing?  because of a) the
> cost (at least $4.50) b) the number of ICs (4) it's starting to tip in
> favour of the STM32F again, i get the feeling you'd be better off
> wiring up the STM32F as a USB 1.1 device.  you'll also need to wire up
> the UART to the EOMA68 interface and a couple of other pins to put it
> into "firmware upload" mode, but that's ok.
>
>  the advantage there is that i have some GPL'd KiCAD designs with
> STM32F already in them (or have found some out there when i last
> checked).

Yes, the USB flash drive can be removed.

I think Daniel also prefers a microcontroller.

2014-08-06 14:18 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
>  * one GPIO IC IN pin is needed for MicroSD "detect"
>  * digital GPIO IC OUT pin needed for power-up of LCD
>  * accelerometer IRQ goes to digital GPIO IC IN
>  * digital GPIO IC IN pin connects to IRQ-OUT of AXP209
>  * digital GPIO IC IN pin connects to Headphone-detect (in case you
> want to alter volume on headphone-out)

So, do we connect all this to STM32F? Or do we have to add the STM32F
and the digital GPIO IC?

Thanks.