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[aprssig] PIC : Store GPS on SD or USB or CF

Jim Wagner wagnerj at proaxis.com
Sun Mar 18 15:40:10 UTC 2012


> Date: Sun, 18 Mar 2012 10:48:48 +1000
> From: "Andrew Rich" <vk4tec at tech-software.net>
> Subject: Re: [aprssig] PIC : Store GPS on SD or USB or CF
> To: "Greg Clark" <k7rkt at bigredbee.com>,	"TAPR APRS Mailing List"
> 	<aprssig at tapr.org>
> Message-ID: <D4D996E6B8944A9684A06AB8B2DFE525 at MacBook>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Thanks
> 
> I have done quite a bit of work with GPS and PIC USART
> 
> The thing I am having probs working out is the way you talk to the storage devices.
> 
> - Andrew VK4TEC - 
> 
> 
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> 
> End of aprssig Digest, Vol 93, Issue 14
> ***************************************
> 
One of your problems is that USB memory devices need to be driven by a USB host or USB On-The-Go (OTG). Not all of the microcontroller USB devices can work as hosts or OTGs. The FTDI 232 family of interfaces don't either. 

SD devices can run from SPI. If it were on an AVR, there is a nice library for working with SD. There ought to be such a library for PICs.

Jim Wagner
KA7EHK


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