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I2C using PIC16C5X

 
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edbfmi1



Joined: 18 Jul 2006
Posts: 103

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I2C using PIC16C5X
PostPosted: Mon Jul 31, 2006 2:16 pm     Reply with quote
I have poored over everything I can find pertaining to I2C. I have not found (or maybe overlooked) any information on using 2 Pins from a 16C5X series to communicate with a Serial EEPROM.

More to the point. I am using a PIC16C57 and 24LC16B EEPROM for storage. Does anyone know of a routine to use - say - PORTB.6 and PORTB.7 as the SCL and SCD pins?

Thanks for any help.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jul 31, 2006 2:30 pm     Reply with quote
Quote:
Does anyone know of a routine to use - say - PORTB.6 and PORTB.7 as the SCL and SCD pins?

CCS has examples for this. Look at the EX_EXTEE.c example file
and the 2416.c driver file. In the example file, you'll have to change
the PIC from a 16C56 to a 16C57.

Also, to change the default pins used by the 2416.c file, you need to
add the following lines shown in bold below:
Quote:

#define EEPROM_SCL PIN_B6
#define EEPROM_SDA PIN_B7
#include <2416.c>


The example file is in this folder: c:\Program Files\Picc\Examples
The driver file is here: c:\Program Files\Picc\Drivers
Ttelmah
Guest
PostPosted: Tue Aug 01, 2006 4:01 am     Reply with quote
As one further comment, if the supplied drivers are not working. The commonest 'mistake' with I2C, is forgetting the pull-up resistors needed on each wire. This happens about once a month here on average. The internal port_b pull-ups, are not enough for I2C to work properly.

Best Wishes
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