About RobertK

RobertK · 2023-09-28

Hi all, I have a problem with a new version of an existing PCB using the STM32F334C8T6 microcontroller.Known working code is loaded onto the new PCB, power is applied and the MCU starts up the clock and then seems to sit idle. If the NRST pin is then...

RobertK · 2024-07-17

Trying a 5.0x3.2mm crystal is a nice idea BarryWhit I would love to try that however I have run out of time and will have to put the research/experimentational down and go with the old, known working, HC-49/U-S package crystal. An unsatisfactory end ...

RobertK · 2024-07-11

Hi Peter BENSCH,Again I'm extremely leery of claims my PCB layout is the source of my problems. While I've not slavishly followed AN2867 I feel I've got the gist of it and it's 100 times better than what was previously designed. Also to confirm this...

RobertK · 2024-07-11

X1 in your example layout from AN2867 is the LSE 32.768kHz crystal, I'm using the HSE crystal pins, which would be the X2 traces. My traces are 11.3 & 14.3mm long, which is 1/28,000 of the 8MHz wavelength so reflections shouldn't be an issue and it's...

RobertK · 2024-07-01

Hi BarryWhit,1. I don't really have much access to the firmware, my company has very little firmware resources.2. The 10kΩ and 100nF on NRST is from a previous version of this PCB (by my predecessor) with ~700 working boards out in the world. I alwa...

RobertK · 2024-06-25

It's been a while but I am still having issues!After testing a few PCBs with 6.8pF capacitors I thought this was the fix and ordered another 30x PCBs with 6.8pF capacitors.5x of these boards do not work, on power up they are non-responsive then once ...

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The MCU requires NRST to be toggled after power on

Re: The MCU requires NRST to be toggled after power on

Re: The MCU requires NRST to be toggled after power on

Re: The MCU requires NRST to be toggled after power on

Re: The MCU requires NRST to be toggled after power on

Re: The MCU requires NRST to be toggled after power on