> I once debugged my I2C routines with LEDs. But note that some conditions > (start?) require 'simultaneous' transitions, which can not be verified > in this way. No they don't. A start is a falling edge on SDA while SCL is high. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads