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i2c 24c256 ex_extee.c setup_spi(FALSE)

 
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javabear



Joined: 22 Feb 2004
Posts: 1

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i2c 24c256 ex_extee.c setup_spi(FALSE)
PostPosted: Sun Feb 22, 2004 11:13 pm     Reply with quote

Hi,

[frank@picard frank]$ ccsc +v
PCM compiler version 3.168 (linux, RH9)

I was running some test code from PCM programmer 24lc256.c
on a pic16f876 and 24c256 eeprom via i2c.

All is well, thanks for the example code.

Now the strange part (or maybe I am tired).

if i run ex_extee.c, reads and writes do not work
reads return 0xff and writes hang.

however if I add 1 extra line after init_ext_eeprom

init_ext_eeprom(); <-- existing line, no change

setup_spi(FALSE); // added by me - program now works ... aaarrgh !!!!!!

then it all works.

I have read some discussions about using setup_spi(FALSE); so
now I am confused.

Has anyone else seen this ??

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 23, 2004 12:34 am     Reply with quote

Quote:
if i run ex_extee.c, reads and writes do not work
reads return 0xff and writes hang.

I'm not familiar with the Linux version, but here are my thoughts:

I assume that you have edited the EX_EXTEE.C file, to #include
the CCS driver file, 24256.C.

I assume that you are using pins C4 and C3 for SDA and SCL.

So, in the EX_EXTEE.C file, place the following lines above the
line for #include <24256.c>

#define EEPROM_SDA PIN_C4
#define EEPROM_SCL PIN_C3

Example:
Code:
#define EEPROM_SDA  PIN_C4
#define EEPROM_SCL  PIN_C3
#include <24256.c>


See if that makes a difference.
Guest








PostPosted: Mon Feb 23, 2004 9:22 pm     Reply with quote

PCM programmer wrote:
Quote:
if i run ex_extee.c, reads and writes do not work
reads return 0xff and writes hang.

I'm not familiar with the Linux version, but here are my thoughts:

I assume that you have edited the EX_EXTEE.C file, to #include
the CCS driver file, 24256.C.

I assume that you are using pins C4 and C3 for SDA and SCL.

So, in the EX_EXTEE.C file, place the following lines above the
line for #include <24256.c>

#define EEPROM_SDA PIN_C4
#define EEPROM_SCL PIN_C3

Example:
Code:
#define EEPROM_SDA  PIN_C4
#define EEPROM_SCL  PIN_C3
#include <24256.c>


See if that makes a difference.


Yep, I had previously tried as you have mentioned. I know the pins are ok as
the code works once I add setup_spi(FALSE); Hmm thanks anyway.

The only thing I can think of is that perhaps the latest Linux CCSC release is
3.168 while the latest windows version is 3.185 and maybe there are some
bug fixes I am missing. I have enquired about the difference to CCS but no
answer thus far.

Cheers / Frank Very Happy
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