Portenta LED Pattern Decoder Ring

[jwestmoreland]

Hello,

I was wondering if we could get definitions of the LED patterns on the new Portenta M7 - e.g.:

*) Red LED - 4 Longs, 4 Shorts - what does that mean? (Something isn't right, but what's the meaning...)

I suppose this is in the code somewhere - but would be nice to have LED blink guide/decode sheet.

Thanks! John W.

[per1234]

Hi @jwestmoreland. It is explained here: https://github.com/arduino/ArduinoCore-nRF528x-mbedos/issues/90#issuecomment-654062552

if the board starts emitting the "morse-like" blinking pattern it means that something has gone very wrong (memory corruption or similar). Double clicking the reset button will bring the board in bootloader mode so you can always use that method as a failsafe. To discover which bug caused the hang you can hook a serial-to-usb converter to pin TX1 (serial configured as 115200@8n1) and the system will report where the crash happened and what was the root cause.

That issue was from a Nano 33 BLE user, but the same information also applies to the Portenta. On the Portenta, the debug information is output on pin 14.

[jwestmoreland]

Hello @per1234 ,

OK - I've been connected to D14 (aka TX) - and here's what it dumped: (didn't know it had debug info there...that was tied to LED blinks anyway.)

............ ++ MbedOS Fault Handler ++

FaultType: HardFault

Context: R0 : 00000000 R1 : 0805B260 R2 : 00000001 R3 : 00000000 R4 : 00000000 R5 : 0000000C R6 : 00000001 R7 : 00000000 R8 : 00000000 R9 : 00000000 R10 : 00000000 R11 : 00000000 R12 : FFFFFFFF SP : 2400CFC0 LR : 080427FB PC : 00000000 xPSR : 200F0000 PSP : 2400CFA0 MSP : 2407FF78 CPUID: 411FC271 HFSR : 40000000 MMFSR: 00000000 BFSR : 00000000 UFSR : 00000002 DFSR : 00000000 AFSR : 00000000 Mode : Thread Priv : Privileged Stack: PSP

-- MbedOS Fault Handler --

++ MbedOS Error Info ++ Error Status: 0x80FF013D Code: 317 Module: 255 Error Message: Fault exception Location: 0x0 Error Value: 0x24004A70 Current Thread: main Id: 0x2400D024 Entry: 0x8047F69 StackSize: 0x8000 StackMem: 0x24005000 SP: 0x2400CFC0 For more info, visit: https://mbed.com/s/error?error=0x80FF013D&tgt=PORTENTA_H7_M7 -- MbedOS Error Info --

Would still be nice to have a guide maybe.

Thanks, John W.

[per1234]

Would still be nice to have a guide maybe.

I agree 1000%. I think it would be helpful for this behavior and the recovery procedure to be documented for all Arduino boards that run Mbed OS.

I didn't at all intend to imply that I considered my previous reply to be sufficient to resolve your request. I started to add that to my previous reply but it's not there so I must have forgotten to click the "Update Comment" button after I wrote the edit.

[jwestmoreland]

Hello @per1234 ,

No problem - we can start one here I suppose - above decodes to HardFault exception - maybe an enhancement is to add some of the error handling discussed in the Mbed docs to make it more human readable and to be able to read the area in RAM that's dedicated to recording errors on the next reboot; could be handy.

Thanks, John W.