Software - Geometrics Forum

Using UART4 to stream data to a Rpi4

Ana Teresa Falcão — Thu, 02 Jul 2026 04:25:11 +0000

Hello,

I saw in a previous post that the current firmware only supports MFAM streaming via Ethernet, and that UART5 isn't supported. I'm modifying the Dev Kit firmware to add TX output on UART4 instead, by adding a parallel Mailbox_post in spiTaskFxns.c to a new UART4 TX task/mailbox, at 460800 bps.

Before going further, I wanted to ask:

Is there any hardware-level reason UART4 wouldn't work here, beyond it just not being implemented in the stock firmware?
Does the existing SPI→Ethernet pipeline assume a single consumer, in a way that could cause timing issues if I add a second parallel mailbox post for UART4?
Has anyone tried UART-based streaming from the Dev Kit before, and if so, any known pitfalls?

Thanks in advance!

MFAM Dev Kit TIVA example code

Rui Zhang — Thu, 28 May 2026 21:47:28 +0000

We will provide the example source code for MFAM Dev Kit 'as-is' for your reference and review. Please note that we do not provide any technical support, maintenance, debugging, or updates for this code.

Click below to download:

154

How to measure with 2 MFAM systems in sync?

Martin Voelker — Wed, 20 Dec 2023 11:59:14 +0000

Hello,

we have 2 MFAM systems with 2 OPMs each, and would like to measure in sync. We saw that we can add a 1 PPS pulse as sync trigger when GPS is not available.

But on Software side, MagView can only read from one system, and we could not figure out how to open 2 MagView instances on the same computer. (We would not like to use 2 computers...).

Is there an easy way how we can achieve this?

Thanks in advance.

Is there a way to change the WIFI SSID of Dev Kit?

Rui Zhang — Sat, 09 Dec 2023 01:43:38 +0000

If you have multiple MFAM Dev Kits and wish to assign different SSIDs, you can download the following program to generate a customized SSID. The instruction is also included.

How to parse the MFAM SPI packet?

Rui Zhang — Thu, 30 Nov 2023 16:32:00 +0000

The detailed MFAM SPI Packet Structure can be found in the MFAM module user guide (in the USB drive shipped with the product).

The detailed Dev Kit Ethernet Packet Structure is shown in Appendix B of the Dev Kit user guide (in the same USB drive).

If you plan to develop your own code to parse the MFAM data, an example code in both c and MatLab can be downloaded below:

Why can't I change the sample rate of MFAM through MagViewMFAM?

Rui Zhang — Fri, 15 Sep 2023 18:57:57 +0000

The MFAM sample rate is fixed at 1 kHz.

The sample rate in MagViewMFAM is only applied to the processed data (reading display and saved ASCII data). The binary data is always at 1 kHz.

The sample rate in WIFI firmware is fixed at 1 kHz.

Please remember to low pass filter the 1 kHz readings first before down sampling.