Jason: What happens when you reading the device with the i2cdump utility? This has a mode setting to control whether it reads bytes (8 bits) or words (16 bits) at a time. For example:
i2cdump -y 2 0x67 b Should dump the entire contents of the MCP9600 registers as bytes. There’s a man page that gives all the options. I found this command useful when troubleshooting my own i2c devices. If i2cdump works properly, that would seem to indicate a driver issue. If it doesn’t work, then it’s something else. -Steve > On Jan 17, 2021, at 12:09 PM, Jason Kridner <jkrid...@beagleboard.org> wrote: > > > > On Wednesday, June 19, 2019 at 12:12:05 PM UTC-4 maden...@gmail.com wrote: > Dear friends, I'm trying to use the mikro-e Thermo K Click > <https://www.mikroe.com/thermo-k-click>, a break out board with Microchip's > MCP9600 > <http://ww1.microchip.com/downloads/en/DeviceDoc/MCP9600-Data-Sheet-DS20005426D.pdf> > thermocouple convertor, with the BeagleBone Black. It is connected by I2C > and supports a clock frequency of up to 100 kHz. > In order to read a measurement from the MCP9600 (at the I2C address 0x67), > six bytes of data have to be read from its register 0x00 on: > <BBB_Query_20190618_GutfallMitStretching.png> > > As specified in the MCP9600's data sheet, clock stretching occurs after each > transmitted byte. > > More than 90% of all queries yield non-sense values because clock stretching > after some bytes is missed and the previous one seems to be repeated then, > which looks like this: > <BBB_Query_20190618_SchlechtfallTlwOhneStretching.png> > > Do you have any idea what is going wrong there? I believed the BBB to support > clock stretching, and now I'm wondering if that is really the problem. > > Thank you for your help in advance. > > > Did you ever get any resolution on this? The hardware/driver should support > clock stretching, but I've started running into an issue where it doesn't > seem to be reporting the support properly--though I could be dealing with an > issue with a incompletely back-ported driver. It made me curious if you ever > found your issue. > > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/2d0c6fb6-7f05-4be8-892c-c0e52601c96fn%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/2d0c6fb6-7f05-4be8-892c-c0e52601c96fn%40googlegroups.com?utm_medium=email&utm_source=footer>. > <BBB_Query_20190618_GutfallMitStretching.png><BBB_Query_20190618_SchlechtfallTlwOhneStretching.png> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/27B199CF-8A6A-4747-8FD6-F46BCB1467AE%40gmail.com.
