seandeg
Member
Hi All,
when using Maple IDE I have changed in my sketch the recieve buffer size from default 64 by using the
#define USART_RX_BUFFER_SIZE 128
However it looks like the receive buffer still has never more than 64 bytes in it. May well be an issue not related to Maple at all at the sending side.
My question --- is it valid to use the above #define to override the setting from usart.h when building with the IDE ?
Thanks, Seán
seandeg
Member
Hi ala42,
thanks for your reply.
When you say "at the place where it is originally defined" that would be in the usart.h file. Is that where you mean?
I don't know if I can get at that file using the IDE,at least I did not find that file or any of the library source files under the IDE directory. Thats why I hope that putting a #define line in the application program to override the definition from the usart.h file will work.
Thanks, Seán
gbulmer
Moderator
seandeg - I think you have a couple of obstacles to overcome.
First, the macro name is USART_RX_BUF_SIZE and not USART_RX_BUFFER_SIZE.
Second, the usart_dev struct, which contains the USART_RX_BUF_SIZE buffer for each USART, are statically defined in usart.c. So you might be able to persuade the code to use a smaller part of that buffer, but the buffer can't be increased in size unless usart.c is recompiled and linked to your program.
The value of USART_RX_BUF_SIZE could be redefined by defining it, e.g.
#define USART_RX_BUF_SIZE 128
before including uasrt.h. However, if it is to take effect, usart.c needs to be compiled too, with this change. So either usart.h needs to be edited to change the 64 to 128, or usart.c needs the #define added before including usart.h.
I'd probably make a copy of usart.h and usart.c, into the project's directory, edit (at least) one of them, and add usart.c as a tab in the IDE. WARNING: I haven't checked this, it might be that the include path doesn't include the current directory. So you might want to change the #include <...> to #include "..." to ensure the project's copy is the one used.
(Edit: removed error about libmaple)
(Full disclosure: I am not a member of LeafLabs staff)
mlundinse
Member
The exact place is a bit dependent on what OS you use, but look for
something like "hardware/leaflabs/core/maple/usart.h"
Just make a copy of this file and rename it to someting like usart.h.original
and then edit the usart.h
The reason why a redefinition of USART_RX_BUF_SIZE in your main file before including
usart.h doesnt work is that this redefinition will not be valid when the usart.c is compiled, separatly from your main sketch.
The usart.c will be recompiled every time you recompile your project, if you
are working inside the IDE.
seandeg
Member
Thanks to all who helped out - mlundinse,gbulmer and ala42.
Got it done!
In windows XP found usart.h in MapleIDE_toplevel_directory\hardware\leaflabs\cores\maple
commented out the default and added my own line, saved, and went back to my sketch. Compiled, uploaded and executed --- new buffer size has taken effect
Seán
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