What you guess about the SDA/SCL lines is correct.
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I'm just wondering why so many people avoid using the I2C(TWI) interface as designed.
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I'm trying to learn how the Atmel I2C/TWI interface actually works.
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But right now I am trying to repair my ENGINEERING computer. Several hard drives have died (from age I think) and I need to buy more modern drives.
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Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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----- Original Message -----
Sent: Monday, July 16, 2018 1:15 PM
Subject: Re: [QRPLabs] Si5351A VFO/SigGen I2C Hardware question #vfo
It looks like Hans needed PC5 (normally used for SCL) for the IPPS interface to the GPS module.
Maybe he can comment on why the hardware wiring ended up as it did. I am sure he had a very good reason for this.?
Also i noticed the PD2 (physical PIN4) on the ATmega328 is connected to both D6 on the LCD (which is not using I2C)
as well as SDA on the Si5351a. This is also confusing.?
I am guessing that maybe the?Si5351a ignores anything on the SDA line without?
the clock (SCL) signal being present so that allows PD2 to serve a dual purpose ?
Cheers
Michael VE3WMB?
