Thanks Robert :) I'll keep also this mail which help me for my server coding (on a PC under Linux).
But my concern is using this PIC as a slave. Any code for that ? Thanks Laurent PS: when it's working, I'll put some workable example code on my own site because I don't think I'm the only one with such question ;D --- The misspelling master is on the Web. _________ 100 % Dictionnary Free ! / /( / Dico / / Pleins d'autres fautes sur /________/ / (#######( / http://destroyedlolo.homeunix.org Quoi, des fautes d'orthographe! Pas possible ;-D. A voir aussi : http://sillingy.clubphotos.fr , le site du photo club de ... Sillingy. --- En date de : Ven 9.7.10, Robert Bergfors <s...@rofa.penti.org> a écrit : > De: Robert Bergfors <s...@rofa.penti.org> > Objet: Re: [Sdcc-user] Example or tutorial for I2C usage with PIC > À: sdcc-user@lists.sourceforge.net > Date: Vendredi 9 juillet 2010, 14h19 > Quoting "Laurent FAILLIE" <l_fail...@yahoo.com>: > > > Thanks Robert for your mail : I'll certainly use you > code for my > > PICs haven't I2C hardware. > > > > Pic 16F88 have the needed hardware and I did notice > those function > > in libio lib. > > But my question is more having a full example, from 0 > to a workable > > tiny application : > > - initialization to do, > > - choregraphy > > - checks > > > > Thanks > > > > Laurent > > Hello Laurent, > > It's a long long time since I programmed all of this, but > the > I2C-specific initialation that I used (for running a > PIC16F886 as I2C > master) looks like this, some of it may be unnecessary, but > I added > them to be on the safe side. I now regret not commenting > the code more > thorougly... I do not, however, have any experience with > the 16F88, > but as I understand it, it should be almost the same as > 16F88X > series...? At least the registers seem to have the same > names. > > { > TRISC3=1; > TRISC4=1; > SMP=1; > WCOL=0; > SSPOV=0; > SSPEN=1; > CKP=1; > SSPCON=SSPCON&0xf0; > SSPCON=SSPCON|0x08; > GCEN=0; > ACKSTAT=0; > ACKDT=0; > ACKEN=0; > RCEN=0; > PEN=0; > RSEN=0; > SEN=0; > SSPADD=15; > } > > > Basicly what I did was just read the PIC datasheet really > carefylly > and set all the relevant registers I could find, I never > used any > library functions for anything. > For the 16F886: > SSPSTAT contains the various flags to check. > SSPCON contains the registers to set, and most stuff that > follows > SSPCON in the above code are part of the SSPCON2 register. > > > Then I just sit and wait for an external interrupt that > makes the > program read out one byte from the slave, in this case a > 1Hz square > wave output from the RTC DS1337 which triggers the PIC to > read out the > clocktime from the RTC. > > void RTCputc(unsigned char addr, unsigned char c_data) > > { > unsigned char c; > c=(RTC_ADDR<<1)&0xfe;; // > recalculate the I2C address & write bit > I2Cstart(); > I2Cwrite(c); // send > the RTC address to the bus > I2Cwrite(addr); // send > the RTC internal memory location > I2Cwrite(c_data); // send the data to > that location > I2Cstop(); > } > > > unsigned char RTCgetc(unsigned char addr) > { > unsigned char c; > c=(RTC_ADDR<<1)&0xfe; // > recalculate the I2C address & write bit > I2Cstart(); > I2Cwrite(c); > // Send the RTC's I2C address > I2Cwrite(addr); > // RTC internal memory location to be > read > I2Crestart(); > c=c|0x01; > // swap the Read/write bit > I2Cwrite(c); > // resend the address > c=I2Cread(0); > // read one byte, passing the ACK/NAK bit > I2Cstop(); > return(c); > } > > I hope I answered the right question this time :o) > If you want, I could send the entire project as a .tar.gz, > it's a > school project and contains no secrets, only perhaps bad > ideas :o) > > Best Regards, Robert > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > Sdcc-user mailing list > Sdcc-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sdcc-user > ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
