Hello Dave, an afterthought:
before you try and implement a protocol with multiple configuration bytes and answer-response traffic, you may want to make sure that a one-byte message does get through to the I2C device. You could use a PCF8574 (or PCF8574A with the alternate address) and simple led-resistor loads on the totem-pole (20mA source and sink) outputs to check the physical bus. Jean-Paul Le Jeudi 3 Juillet 2008 07:54, dave jones a écrit : > Hi Dave, > > I want to read/set RTC date and time with 8051 via the i2c protocol. > I2C implementation protocol I used is > http://sdccokr.dl9sec.de/dld/top03_pac01.zip > Also, I found out there are no ouput voltage with the SDA pin, I > should set SDA = 0. > I guess that i2c implementation I got is wrong? Thanks. -- Tu mangeras quand tu seras compétitif, Mamadou ! -- Never jump into a loop! ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
