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Forum Index : Microcontroller and PC projects : MM - default serial port buffer size.

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Greg Fordyce
Senior Member

Joined: 16/09/2011
Location: United Kingdom
Posts: 153
Posted: 11:42am 02 Jul 2013
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According to the MMBasic language manual, page 43, the default buffer size is 256 bytes. Unless I am mistaken it appears that the default size in Ver 4.3A is 128 bytes. Can someone confirm my suspicions, and if I am correct the Language Manual for the soon to be released 4.4 (which I am looking forward to ) should be updated to reflect this.

Cheers,

Greg.
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3272
Posted: 06:21pm 02 Jul 2013
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Thanks Greg, You are right, the default is 128 bytes and I need to change the manual.

Geoff
Geoff Graham - http://geoffg.net
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3272
Posted: 09:48pm 02 Jul 2013
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An update on this... because the minimum memory allocation is 256 bytes it makes sense to set the default buffer size in MMBasic to 256 bytes. And leave the documentation unchanged (stating 256 bytes).

Geoff
Geoff Graham - http://geoffg.net
 
Greg Fordyce
Senior Member

Joined: 16/09/2011
Location: United Kingdom
Posts: 153
Posted: 12:39am 03 Jul 2013
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Thanks for clarifying this Geoff. Does this mean that the buffers will always use 256 byte blocks of memory? So if I set the buffer size to say 200 bytes I won't save any actual memory space in the MM?

Greg
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3272
Posted: 03:38am 03 Jul 2013
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Yes, that is right. And because the memory allocation works in blocks of 256 bytes, if you set the buffer size to 1000 bytes (for example) then actually 1024 bytes of memory will be used.

Geoff
Geoff Graham - http://geoffg.net
 
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