<![CDATA[ARM pins on OpenIMU330BI]]>Is there any documentation on which ARM M4 pins are connected to which IMU330BI module BGA pins? Specifically, I'd like to add an SPI master to the firmware. It looks like SPI1 is used internally for sensors and SPI2 is the user SPI interface, so is SPI3 available and accessible (ARM PC10-12 or PB3-5)?

]]>https://forum.aceinna.com//topic/102/arm-pins-on-openimu330biRSS for NodeMon, 09 Mar 2026 11:48:03 GMTSat, 16 Nov 2019 03:29:49 GMT60<![CDATA[Reply to ARM pins on OpenIMU330BI on Sat, 16 Nov 2019 03:29:49 GMT]]>Is there any documentation on which ARM M4 pins are connected to which IMU330BI module BGA pins? Specifically, I'd like to add an SPI master to the firmware. It looks like SPI1 is used internally for sensors and SPI2 is the user SPI interface, so is SPI3 available and accessible (ARM PC10-12 or PB3-5)?

]]>https://forum.aceinna.com//post/411https://forum.aceinna.com//post/411Sat, 16 Nov 2019 03:29:49 GMT<![CDATA[Reply to ARM pins on OpenIMU330BI on Mon, 18 Nov 2019 00:25:35 GMT]]>Yes, SPI2 is the user SPI interface. SPI3 is not accessible. You could choose Uart interface instead.

]]>https://forum.aceinna.com//post/413https://forum.aceinna.com//post/413Mon, 18 Nov 2019 00:25:35 GMT<![CDATA[Reply to ARM pins on OpenIMU330BI on Mon, 18 Nov 2019 16:00:26 GMT]]>@Jack-Morrison OpenIMU300BI pinout documentation updated to reflect MCU pins routed to external BGA contacts. Please check it here (excel file):

https://openimu.readthedocs.io/en/latest/330BI/pinout.html

]]>https://forum.aceinna.com//post/415https://forum.aceinna.com//post/415Mon, 18 Nov 2019 16:00:26 GMT<![CDATA[Reply to ARM pins on OpenIMU330BI on Mon, 18 Nov 2019 18:03:38 GMT]]>Excellent, thank you. Is G3 connected to PB12?

Yes, my plan now is to use the UART interface for the host, and modify the firmware to rejigger SPI2 as a master.

]]>https://forum.aceinna.com//post/416https://forum.aceinna.com//post/416Mon, 18 Nov 2019 18:03:38 GMT<![CDATA[Reply to ARM pins on OpenIMU330BI on Wed, 20 Nov 2019 07:26:39 GMT]]>PB12 used as SPI2_NSS function

]]>https://forum.aceinna.com//post/433https://forum.aceinna.com//post/433Wed, 20 Nov 2019 07:26:39 GMT