CALIBRE
THE MOST COMMONLY ASKED I2C QUESTIONS
6.1.General Questions
Question | Will my adapter run I2C clock speeds greater than 90KHz? |
Answer | At the moment your adapter is limited by the Bus Controller chip fitted, to a maximum |
| of 90KHz as a master and 100KHz as a slave. |
Question | Will my adapter work under Windows NT4* or Windows 95*? |
Answer | The adapter will work under both these systems without problems. If you need to |
| access the Windows NT and Windows 95 DLLs please contact our sales team for |
| further information. |
| * All trade marks acknowledged |
Question | I get corrupted transfers why is this? |
Answer | The most likely reason for corrupted transfers is either incorrect bus termination or |
| excessive capacitance - see the manual for details. |
Question | Do you have software to talk to my........? |
Answer | Unfortunately there are too many I2C devices for us to be able to offer complete |
| solutions - although we can supply a windows based application called WINI2C which |
| is designed for those just starting I2C or wishing to perform simple I2C tasks, please |
| contact our sales team or look on our web site, www.calibreuk.com for further |
| information. |
Question | I am trying to read from a device, the first time my software works fine but when |
| I try again I can't get anything what's wrong? |
Answer | Please check that you are changing the value of Setnack in accordance with the |
| manual, it is likely that you have not made Setnack 1 for the last AND last but one |
| bytes being read. |
6.2.DOS Software Questions
Question | My I2C adapter locks up with a constant status - why? |
Answer | If you are using either the 'C' or Basic library functions supplied with the adapter on a |
| fast PC it is possible that the PC is polling the status register too quickly, the simplest |
| way to prevent this is to add a small delay prior to reading the status in the getstatus |
| routine. Alternatively use the windows DLL supplied as these automatically allow for |
| speed of the PC at |
6.3.WINDOWS 95 and NT Questions
Question | My software cannot find the adapter. Your Windows software reports that it |
| cannot configure the adapter. Why is this? |
Answer | Have you registered the device driver as detailed in the software manual? If so check |
| that the address links (see adapter manual for details) are correct for the location at |
| which you registered the driver. |
Question | I think I have registered the driver how can I find out if I have? |
Answer | You need to inspect the registry as follows |
Issue 1.3 | Page 30 |
22/07/99
