Access SMB/I2C on mPCIe interface

Hello,

We have a LoRa gateway application that requires access to the I2C (SMB) port on X100/mPCIe (pins 30/32).  With the module installed, we would expect to be able to find its address (0x42) via i2cdetect appearing on one of the /dev/i2c-* devices (0 through 6).  The Operating Instructions manual identifies these pins as SMB_CLK (30) and SMB_DATA (32) which matches the I2C pins on our wireless module.  Appreciate any help in getting these to appear under Debian and if we need to enable anything specifically to make it happen.

Thanks, Rob

Hello,

We have updated the IOT2050 to be the latest firmware and Example Image 1.2.1.  What we have found is that we still cannot see the i2c GPS device on the RAK5146 USB/LBT/GPS we have here, but when we insert an older RAK2287 (which also has the same UBlox i2c GPS device) we see it correctly (address 0x42 in /dev/i2c-3).  For completeness, when the i2c is activated in the Arduino module/shield using iot2050setup, it appears to the OS in /dev/i2c-4.  The /dev/i2c-3 appearance from the mPCIe slot does not require any additional configuration to make it visible.

We are putting the suspect RAK5146 into another development platform today where we can exercise all interface types on the mPCIe and will post again here after that.  We have also ordered another identical device from a local distributor in case it is this one module that is not working correctly, or whether there is some other hardware incompatibility.

Hope this helps, Rob