Sferalabs Iono Pi Max v2 3+ Lite User Manual page 59

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Firmware upload and MCU programming

WARNING

The microcontroller ﬁrmware implements critical logic and checks to ensure safe and

reliable operations of Iono Pi Max including, but not limited to, fan control for heat

dissipation, the battery charger logic, the VSO regulator control, watchdog, µSD switch

matrix control, power distribution voltages, currents and internal temperature monitoring.

You can download the latest version of the standard ﬁrmware here:

https://www.sferalabs.cc/ﬁles/ionopimax/fw/latest/ionopimax-fw.bin

In order to develop a safe and reliable custom ﬁrmware, you should be fully aware of the

internal hardware architecture of Iono Pi Max, and of all safety and control requirements

needed for your application and installation constraints.

The Iono Pi Max SAME54E microcontroller's SWD and support lines used to ﬂash

ﬁrmware and debug are connected via a high speed switch to the Raspberry Pi's

GPIO41-45 pins, as you can see in the circuit block diagram detail below.

SWD LINES AND ENABLE SWITCH

The BU31 is a high speed digital switch that prevents unintentional use of these lines, and

can be used to disable, at hardware level, access to the SWD and MCU reset lines.

Installing jumper JP2 effectively disconnects these lines and prevents the Compute

Module from enabling them raising GPIO41. JP2 is not factory installed, so that MCU

programming is not blocked in Iono Pi Max as shipped.

Iono Pi Max User Guide

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