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3,603 Views 4 Replies Last post: Nov 19, 2009 4:39 AM by CraigG RSS
felix Contributor
felix
7 posts since
Jun 17, 2009
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Jul 15, 2009 12:52 PM

VDK: how to redirect printf to UART with minimal code footprint

VDK: how to redirect printf to UART with minimal code footprint instead of debug-console? I don't need scanf only printf.

CraigG Analog Employee
CraigG
444 posts since
Jan 29, 2009
Currently Being Moderated
1. Jul 16, 2009 5:39 AM in response to: Felix Lazarev
Re: VDK: how to redirect printf to UART with minimal code footprint

felix wrote:

 

VDK: how to redirect printf to UART with minimal code footprint instead of debug-console? I don't need scanf only printf.

 

Hi,

 

The Blackfin Compiler and Run-Time Library Manual details how to extend I/O support to new devices, using an extensible device driver mechanism. I believe it would require a larger footprint to selectively redirect some parts of the STDIO, than it would to redirect al I/O.

 

Please take a look at the Compiler and Run-Time Library Manual, which is available via the link below. From page 3-43 it discusses the extension of the I/O support to a new device.

http://www.analog.com/blackfin/manuals

rkarthik Analog Employee
rkarthik
13 posts since
Apr 14, 2009
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2. Jul 16, 2009 10:54 AM in response to: Felix Lazarev
Re: VDK: how to redirect printf to UART with minimal code footprint

The VDK Shell Browser Example in VDSP implements this. You could use the code there as a reference –

C:\Program Files\Analog Devices\VisualDSP 5.0\Blackfin\Examples\ADSP-BF527 EZ-KIT Lite\Services\File System\VDK\shell_browser


The relevant files are the ones with ConsoleIO in the file name. The ConsoleIO thread is initialized in CommandThread.c file.


Hope this helps!

 

 

felix Contributor
felix
7 posts since
Jun 17, 2009
Currently Being Moderated
3. Jul 16, 2009 11:05 AM in response to: Felix Lazarev
Re: VDK: how to redirect printf to UART with minimal code footprint

I was looking for more compact way of doing it. Right now if i'm adding whole I/O driver for simple putc replacement it increases my code by 27kbytes. if i'm just compiling printf from FreeRTOS distribution and using direct register access to UART -- it compiles to just 3kbytes of code. I was looking to stay with stdio library but replacing putc only, as most other compilers/libraries allows (weak definition). Is there such way?

CraigG Analog Employee
CraigG
444 posts since
Jan 29, 2009
Currently Being Moderated
4. Nov 19, 2009 4:39 AM in response to: Felix Lazarev
Re: VDK: how to redirect printf to UART with minimal code footprint

Hi,

 

Is this still a problem for you? In order to offer advice we would need to request further information about your current setup. For that reason, we would recommend that, if this is still a problem, you should contact us directly via the link below:

http://www.analog.com/processors/support

 

regards,

Craig.

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