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PIC18F2550 to communicate with an RTC3231

 
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polofemilimc46



Joined: 06 Jul 2021
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PIC18F2550 to communicate with an RTC3231
PostPosted: Tue Jul 06, 2021 3:49 am     Reply with quote

I will use the PIC18F2550 to communicate with an RTC3231, but I need to use RC0 and RC1 in the communication.

Code:
#define EEPROM_SDA PIN_C0
#define EEPROM_SCL PIN_C1

#use i2c (master, sda = EEPROM_SDA, scl = EEPROM_SCL, FAST = 400000)


Is this the correct configuration setting or do I need to change something?
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temtronic



Joined: 01 Jul 2010
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PostPosted: Tue Jul 06, 2021 4:48 am     Reply with quote

Assuming that the 'RTC3231' is actually a PCB that uses the Dallas Semi DS3231, I'd code similar to this...

#define DS3231_SDA PIN_C0 // data pin for RTC
#define DS3231_SCL PIN_C1 //clock pin for RTC

#use i2c (master, sda = DS3231_SDA, scl = DS3231_SCL, FAST = 400000)

notice
I've named (defined) the I/O pins for the device, the RealTimeClock
also I've added comments at the end of the lines ,to tell me late WHAT they're for.

I do use a PCB module with the DS3231 and it ALSO has a small EEPROM on it. While they 'share' the same 2 I/O pins they have separate device addresses.
If your device has both RTC and EEP then a better define would be.
#define RTCEEP_SDA PIN_C0 //data pin for both RTC and EEP

Jay
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