Re: [Gumstix-users] Enabling UART GPSstix -Verdex

[Juan M. O. <jma...@ci...>]

   Hi Dave.

   Thank you very much for your help, I had not paid attention to 3.3V
levels, and the difference between name on pins. Is more clear now.

   Best regards.

> Hi Juan,
>
>> BTUART and STUART should both be available on the GPSstix, although
>> STUART will be connected to the GPS module.
>>
>> The pins on the GPSstix are 3.3v logic level pins, not RS-232 level,
>> so you may need a voltage converter depending on your application.
>
> To further complicate things, the pins don't match up with the
> descriptions.
>
> The PXA270 only has 3 UARTs, FFUART, STUART and BTUART. There is no
> HWUART.
>
> Now, if you look at the 60-pin connector for the verdex:
> <http://docwiki.gumstix.org/index.php/Verdex_60pin_connector_chart>
> you'll notice that pins 35 and 33 are BT_TxD and BT_RxD.
>
> If you then look at the schematics for the Audiostix (the audiostix
> and gpsstix are the same, just that the audiostix doesn't have the GPS
> module installed), you'll see that pin 35 and 33 on the 60 pin
> connector are called X_HW_TXD and X_HW_RXD.
>
> What all this means is that the BTUART on the verdex is brought out on
> the pins labelled HW on the gpsstix.
>
> --
> Dave Hylands
> Shuswap, BC, Canada
> http://www.DaveHylands.com/
>
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Juan F. Martinez Osuna
Electronic Design Engineer.