I2C Reads Stuck

RE: I2C Reads Stuck

Kenneth — Mon, 19 Mar 2018 13:04:50 GMT

Maybe you are closing in to the real problem here, I think it is slightly undefined what happens if you try to unint() the twi module during a transaction, and could explain you issue. However, have you tried to Power OFF and ON again the twi peripheral between uninit() and init()? This can be done writing 0 and 1 to register 0xFFC in the twi peripheral instance you are using.

RE: I2C Reads Stuck

Jason Hendrix — Wed, 14 Mar 2018 16:09:26 GMT

Hi Kenneth,

One issue is that my timeout (the callback function provided to TWI_Perform) is short. When the timer expires, I uninit and re-init the TWI module. It would be nice if the TWI module would finish the byte in progress before stopping, but maybe its clock is being taken away? I plan to look at this a little more in a few days - I think I saw this issue without the timer expire previously.

RE: I2C Reads Stuck

Kenneth — Wed, 14 Mar 2018 13:37:48 GMT

I can recreate what you are experiencing here, but I am not sure what is happening. It seems to be an issue with the twi manager, so it may be that you will need to use the twi driver directly and/or re-init the twi manager between transacations. I think it may have something to do with twi que overflow, because suddenly the twi configuration is corrupt (e.g. scl pin# is invalid causing hardfault).

RE: I2C Reads Stuck

Jason Hendrix — Tue, 06 Mar 2018 16:35:36 GMT

Hi Kenneth,

Attached is a picture of my DK/MPU setup. I installed the right-angle header provided with the MPU and carefully bent the VCC pin out. I then installed the MPU into connector P16 and jumpered over VCC from connector P13.

RE: I2C Reads Stuck

Kenneth — Tue, 27 Feb 2018 09:15:56 GMT

Hi, I have ordered the same module just to ensure we have the same hardware. Eta next week.

RE: I2C Reads Stuck

Jason Hendrix — Wed, 21 Feb 2018 15:33:08 GMT

Hi Kenneth, I'm uploading a project that can be used to recreate the issue. The README provides more detailsdevzone.nordicsemi.com/.../1881.Debug_5F00_Test.zip

RE: I2C Reads Stuck

Jason Hendrix — Wed, 14 Feb 2018 23:40:43 GMT

Hi Kenneth,

I've been delayed slightly - will get back to this in about a week.

RE: I2C Reads Stuck

Kenneth — Tue, 06 Feb 2018 17:32:53 GMT

Maybe you have an I2C EEPROM you can use for test? Or you may emulate an I2C EEPROM using the SDK example:
\nRF5_SDK_14.2.0_17b948a\examples\peripheral\twi_master_with_twis_slave

RE: I2C Reads Stuck

Jason Hendrix — Tue, 06 Feb 2018 16:37:32 GMT

Hi Kenneth, I ordered a mpu6050 module like this one. I won't have HW until this weekend, so I'll upload a project next week. It will probably be based on "twi_master_using_twi_mngr".

RE: I2C Reads Stuck

Jason Hendrix — Tue, 06 Feb 2018 04:37:05 GMT

Kenneth, I was hoping that the dev kit would have an I2C peripheral onboard, but it doesn't appear to. Do you have any suggestions for adding an I2C peripheral to the dev kit? Or some other simple test setup?

RE: I2C Reads Stuck

Jason Hendrix — Mon, 05 Feb 2018 17:31:22 GMT

Hi Kenneth. I should have a dev kit in the next couple of days. In the meantime I'll try to prepare an example to recreate the issue. I think I can recreate it by mixing twim_schedule with twim_perform, as described here: https://devzone.nordicsemi.com/f/nordic-q-a/30169/nrf_twi_mngr_perform-blocking. Obviously I shouldn't be providing bad transfer descriptors, but the question remains - why didn't the transaction finish?

RE: I2C Reads Stuck

Kenneth — Mon, 05 Feb 2018 17:26:29 GMT

Hi,

Typically our list of known issues for each SDK release are updated with issues that are not fixed:
https://devzone.nordicsemi.com/f/nordic-q-a/29796/what-are-sdk-14-x-0-known-issues

The issue here seems to be new for this SDK release.

Do you experience the same when using either twi manager or twi driver directly, as reference:
\nRF5_SDK_14.2.0_17b948a\examples\peripheral\twi_master_using_nrf_twi_mngr
\nRF5_SDK_14.2.0_17b948a\examples\peripheral\twi_sensor

Can you modify the \twi_sensor example so I may recreate it here?

Kenneth