Make PIC C use all available memory banks

[Virchanza]

I have some C code that nearly uses all of the first memory bank. When I
compile it, I get the following:

Data space:
    BANK0                used    5Ch (    92) of    60h bytes   ( 95.8%)
    BANK1                used     0h (     0) of    50h bytes   (  0.0%)
    BANK2                used     0h (     0) of    60h bytes   (  0.0%)
    BANK3                used     0h (     0) of    60h bytes   (  0.0%)
    COMBANK              used     0h (     0) of    10h bytes   (  0.0%)

If I add a few more global variables, I get the following compiler error:

Error   [491] ; . can't find 0x5B words for psect "rbss_0" in segment
"BANK0"
Error   [491] ; . can't find 0x3 words for psect "rdata_0" in segment
"BANK0"
Error   [593] ; . can't find 0x2 words (0x2 withtotal) for psect
"code_ptr" in segment "BANK0"

Does anyone know how I tell PIC C to use all available memory banks? My
microcontroller is 16F887.

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[John Temples-2]

On Sun, 13 Jul 2008, Tomás Ó hÉilidhe wrote:

> Does anyone know how I tell PIC C to use all available memory banks? My
> microcontroller is 16F887.

The manual and the FAQ discuss this.

http://www.htsoft.com/support/faqs.php#faq42

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[Olin Lathrop]

Tomás Ó hÉilidhe wrote:
> Error   [491] ; . can't find 0x5B words for psect "rbss_0" in segment
> "BANK0"
> Error   [491] ; . can't find 0x3 words for psect "rdata_0" in segment
> "BANK0"
> Error   [593] ; . can't find 0x2 words (0x2 withtotal) for psect
> "code_ptr" in segment "BANK0"
>
> Does anyone know how I tell PIC C to use all available memory banks?
> My microcontroller is 16F887.

Split up your variables into multiple sections so the linker can place them
independently.


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[Michael Rigby-Jones]

> -----Original Message-----
> From: piclist-bounces@... [mailto:piclist-bounces@...] On Behalf
> Of Tomás Ó hÉilidhe
> Sent: 13 July 2008 02:25
> To: Microcontroller discussion list - Public.
> Subject: [PIC] Make PIC C use all available memory banks
>
>
> I have some C code that nearly uses all of the first memory bank. When I
> compile it, I get the following:
>
> Data space:
>     BANK0                used    5Ch (    92) of    60h bytes   ( 95.8%)
>     BANK1                used     0h (     0) of    50h bytes   (  0.0%)
>     BANK2                used     0h (     0) of    60h bytes   (  0.0%)
>     BANK3                used     0h (     0) of    60h bytes   (  0.0%)
>     COMBANK              used     0h (     0) of    10h bytes   (  0.0%)
>
> If I add a few more global variables, I get the following compiler error:
>
> Error   [491] ; . can't find 0x5B words for psect "rbss_0" in segment
> "BANK0"
> Error   [491] ; . can't find 0x3 words for psect "rdata_0" in segment
> "BANK0"
> Error   [593] ; . can't find 0x2 words (0x2 withtotal) for psect
> "code_ptr" in segment "BANK0"
>
> Does anyone know how I tell PIC C to use all available memory banks? My
> microcontroller is 16F887.

Which version of the compiler are you using, i.e. full commercial version or the free 'lite' version?  The later is limited to the first two banks.

Irrespective, the bank# modifier used to locate objects within a specific bank is clearly described in the compiler manual.  Being such an advocate of correctly written C I'm somewhat surprised you haven't read the manual to check for compiler/target specific features and deviations from ANSI compliance.

Regards

Mike

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