Re: [Paparazzi-devel] Logomatic with 2 UART?

[Martin Mueller]

Hi Jamie,

the two serial ports are completely symmetrical and can both log xbee or 
paparazzi frames.

The big issue with the current code is that the serial buffer only has 
teh standard 128 bytes size. The (micro) SD card can take up to 400ms 
(200ms usually for a 2GB card) for internal processes. If more than 128 
bytes are received in that time the buffer overruns and you lose data 
(think that was what Cedric saw some time ago).

We need the serial port processing to be done in interrupt code and the 
SD card code to run in the normal while() loop to have it independently.

Martin

On 06/19/2012 12:35 AM, Christophe De Wagter wrote:
> The logger actually already logs both serial ports. The idea is to use
> port 1 to read the data from autopilot -> ground and the other port for
> logging the data from ground -> autopilot.
>
> There is even code to log an extra external analog sensor I believe.
>
> For now, the logger tries to decode paparazzi messages. So you either
> need to send your data using the paparazzi header and footer or need to
> change that bit of the logger code and do your own decoding. Obviously
> you will not be able to log the uplink telemetry anymore if you use one
> of the 2 serials for another purpose.
>
> -Christophe
>
>
>
> On Tue, Jun 19, 2012 at 12:09 AM, Jamie Yuen <address@hidden
> <mailto:address@hidden>> wrote:
>
>     Hello,
>
>     I don't have much experience with embedded programming and have a
>     general question about the logomatic code. After looking through it
>     a little, I am not sure how much effort would be involved in using
>     the logomatic board to log data from 2 UART simultaneously. One
>     would be to log the paparazzi telemetry messages, and the other to
>     log data from an independent onboard sensor (spectrometer). It looks
>     like there is support for multiple UART interfaces, but I am not
>     sure about running two at once. Would this require a lot of new
>     development (once I understand the code)?
>
>     Thanks,
>     Jamie
>
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