Hi Barry, Thanks for the information. After reading much about PMBUS it seems that it should be straight forward. I still have some confusion about PEC. Documents say it is not mandatory. Also lot of people make a lookup table for PEC instead of calculating it. I have my i2c code working in PIC. Thanks for the helpful hints. Chetan Bhargava http://microz.blogspot.com On Wed, Aug 8, 2012 at 12:59 PM, Barry Gershenfeld wro= te: > I did an implementation which talked to a power supply that claimed to us= e > the PMBUS protocol. I first did some reading about PMBUS, and it appeare= d > to be fairly straight-forward i2c, with some added message formats. > Namely, things like a byte count being sent (well, read out), followed b= y > the bytes themselves. When I actually did the interface, I didn't have t= o > change my i2c code. Registers were still just registers. What I did hav= e > to do was work out some of the formats they used to represent their data; > in particular, there is a 2-byte floating point format that provided some > entertainment. > > On Wed, Aug 1, 2012 at 8:55 PM, Chetan Bhargava wro= te: > >> Hello all, >> >> >> I have searched various forums and haven't come across any PMBUS >> implementations on PIC. Is any one of you aware of any PMBUS >> implementations on PIC as PMBUS master? >> My application has to interface with LT2979 power controller that >> talks on PMBUS. >> >> Any pointers would be appreciated. >> >> Thanks. >> >> >> Chetan Bhargava > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .