EB024 / Bluetooth component buffer size

[RobinCordell]

Hi Guys,

I am using an EB024 (with a PIC 16F877A on an EB006) to connect to a Active Pilot Bluetooth GPS unit and am trying to retrieve the NMEA sentences from the device and display these on an EB005 display module. The issue that I am having is that when I use the Bluetooth StringRecieve function, the received string length seems to be limited to 64 characters (with the NMEA sentences from the ActivePilot being about 70 characters long). Is this a limitation of the Blu2i or the Flowcode component that I haven't found in the documentation? Or is there some configuration setting that I have missed? My suspicions are aroused because 64 is quite a nice 'round number'

Any one any clues on this?

Many thanks

Robin

[Sean]

Hello Robin,

The size of the Bluetooth string buffer is set to a default value of 32 bytes.

The buffer size can be adjusted from Flowcode by using the 'Custom Code' feature.

With the Bluetooth component selected in the Properties panel, click on the dots next to 'Custom Code'.
Select [Defines] and click on the 'Edit Code' button.

The line:

#define BLU_STRING_ARRAY_SIZE 32

is used to set the size of the Bluetooth string buffer (line 90 in my version).

You can experiment with different values for this array size - within the usual memory limits.

[RobinCordell]

Thanks Sean,

I did wonder whether there was a buffer size issue. I will have a play as you suggest. If I customise the code in one application, am I customising for all applications including the Bluetooth component or is it confined to that application?

Best regards

Robin

[Benj]

Hi Robin,

The change is confined to that program if you use the custom code feature. You can then export the updated component and import into other programs if needed. You can also revert back to the original code set at any time by looking for the customised functions, clicking edit and then clicking revert.

[Sean]

Customisation applies only to individual projects.

Any changes that are likely to be a common requirement can be made to the corresponding component C file in the Components folder of the Flowcode installation. The changes would then affect every program using the component (save a backup of the original file).

[Spanish_dude]

Hi,

If you need a NMEA parser you can check this article I made a while back when I received the GPS E-Block
http://www.matrixmultimedia.com/mmforum ... =26&t=7879

BR,

Nicolas L.