Please update the stand-alone code examples for v2.1 of Apollo3

[joseangeljimenez]

Hello,

First, I must thank you for having created a great piece of hardware (SparkFun OpenLog Artemis) and firmware (OpenLog for Artemis). We have purchased about 10 boards and all of them work flawlessly.

Context

• I have developed a small prototype with an OpenLog Artemis board connected with a Qwiic cable to a small circular board (custom made) which includes two sensors: pressure (MS5837) and orientation (ICM-20948).

I have been looking into the source code and documentation of the ICM-20948. So far the prototype is working great using the OpenLog Artemis on board ICM-20948. However, I excepted to use the external ICM-20948 via I2C (instead SPI). Is this actually supported? Can you hint me on how to modify the source code to change from SPI to I2C for the ICM-20948?

Thanks for your great support,
Jose

[PaulZC]

Hi José (@joseangeljimenez ),

Changing the OpenLog Artemis firmware to log data from an ICM-20948 via I2C would be difficult. The OLA firmware talks to the on-board ICM over SPI. There is completely different, complex code which builds up a linked-list of all of the devices connected to the Qwiic port so their data can be read. Adding the ICM to that list is feasible, but would be a lot of work. There would be many things to add, including a whole new configuration menu. Adding in the DMP would make things even more complicated. So, what you are asking for is feasible but is difficult and not something I can do soon. I will be concentrating on adding BLE support on the OLA next.

You may be able to write your own logging code using the ICM-20948 example for the OpenLog Artemis. However it looks like that code might be out-of-date and may not work correctly with v2.1 of the Apollo3 core. I will also need to update the SD example so it will run on v2.1 of the core. Adding the MS5837 will be straight forward, the library for that contains its own examples.

I will take an action to update all the examples so they work correctly on v2.1 of the core. I would hope to be able to do that within 1-2 weeks (I have a lot of other projects going on at the moment!). Apologies, but that's the best I can do.

Very best wishes,
Paul

[PaulZC]

Hi José (@joseangeljimenez ),

I have updated the stand-alone examples so they will work with v2.1 of the Apollo3 (Artemis) core. One of the examples - Sensor_Autodetect \ AutoDetectWithMux - contains code which will detect an ICM20948 on I2C and print the accel, gyro, mag and temperature to the serial console. It does not log to SD card; the TIM_TM2_Data_Logging example contains SD-logging code which you could re-use.

This is not a complete solution for you, but at least you now have a good starting point for writing your own code.

Very best wishes,
Paul