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phoenix-rtos / phoenix-rtos-project

Sample project using Phoenix-RTOS
https://phoenix-rtos.com
BSD 3-Clause "New" or "Revised" License
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Soft reset occasionally not triggering #1047

Open adamdebek opened 5 months ago

adamdebek commented 5 months ago

On imx6ull occasionally appeared problem with lack of soft restart caused due to too short time of holding nRST pin down during test campaigns.

Example run: https://github.com/phoenix-rtos/phoenix-rtos-project/actions/runs/8445210403/job/23132189522

For now previous time (0.1s) is changed to 0.2s, which seemed sufficient but it should be checked more in-depth.

damianloew commented 4 months ago

To be checked using oscilloscope or firstly by logic analyzer - to see how this signal looks like - maybe rpi started to set this pin more slowly (?)

It seems that the nrst_pin has to be down for ~6.2ms so much less. From imx6ull reference manual:

As soon as SRC_POR_B occurs, all resets are asserted and the entire chip is reset by
SRC. The SRC_POR_B is stretched for 2 XTALI cycles and the stretching sequence
takes place after 2 XTALI clocks of POR_B pin deassertion.

XTAL is 32kHz

damianloew commented 4 months ago

Please underline that it's only needed on imx6ull target - prefix would be a good idea

damianloew commented 4 months ago

Also please always put the phrtos-project revision in issues - I see that you placed a link from CI, but it's active only for some time.