Any advice for i2c?

Peek

I have been trying to get a DS3231 RTC to respond over i2c and I'm not having much luck. Trying to just read a register on the chip. It's odd formatting, but it wants me to give the register as string representation of a hex number or else it throws Type Mismatch errors. (I think?!?)

10 A$=I2CR(104,"0x03",1)
20 PRINT A$

This runs, but prints a blank line. When I check RET(0) it returns 3

I am not sure what I'm doing wrong here, but it's likely something I'm missing. If anyone has worked with i2c on the BASIC Engine I'd appreciate any insight you have!

Peek

I figured it out, I needed to do a little learning about what data the chip expects - packed BCD. To read a register I have to first use I2CW and write the register number (in BCD) that I want to read from, then use I2CR() with no out_data to get the byte of data from the register. I wrote DEC2BCD & BCD2DEC functions to easily convert between the two. My end goal is to have an AUTOEXEC.BAS file run on boot which queries the RTC and updates the system clock on the B.E. I'm looking forward to having accurate timestamps on my files. Anyway, once I get it finished I'll post a little how-to and the code.