IIC on H8S/2633?

Jul 09, 2004 1 Replies
D

Greetings all:



I'm having difficulty getting the I2C module on the Renesas/Hitachi HD64F2633RTE28 to work properly for reads. (Bus Master only, single byte reads)



Writes work great.



Reads work mostly, but half the time I get an extra



9 clocks for a single byte read. It only works if I insert a delay after the clearing IRIC after the first reading of ICDR. Sometimes the controller freezes with SCL held low. The target (slave) is an FM24C256.

What I need to see is some correct non-interrupt C code (single byte write) that works. The application notes from Renesas are no help at all, with errors and poor descriptions.



(Note: to reply, delete the last character before .com)



regards, DArcy Roberts H T Watt and Associates Ltd.



Vote
Twitter Facebook LinkedIn
P

Which suggests you have not got the acknowledge bit setting correct and/or a timing error on setting registers.

The newest application note that covers that module is

Using The Tiny IýC Interface In Master Mode H8/3664N

Which includes commented C listings available from the European Renesas site. The same IIC module is used in the H8/Tiny series as the H8S/2633, Some functions may be disabled, but there is enough there to get you going.

Try the following app notes

Or the general IIC page

My experiences with IIC and H8/H8S is mainly with adding the Philips PCF8584 controller to a processor that did not have the IIC controller due to the fact of design change after hardware and code for first stage was almost complete.

Paul Carpenter | paul@pcserv.demon.co.uk Main Site GNU H8 & mailing list info. For those web sites you hate.
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required