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  • Case ID: 341907
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CONFIG_NET_L2_OPENTHREAD=y leads to failure in gpio pins.

Allan-led

Hi,

I noticed an issue with CONFIG_NET_L2_OPENTHREAD=y in my project, and I prepared a newer, simpler project to investigate in the issue.

The new program simply sets pins to high and low. After flashing it onto an external module and plugging the external module onto a baseboard, all of the LEDs on the base board should be flashing one by one in a cycle..

As I slowly add more configurations to prj.conf, I realize that adding CONFIG_NET_L2_OPENTHREAD=y when CONFIG_NETWORKING=y will lead to all the external module pins behaving unexpectedly. None of the LEDs on the base board will turn on. What does CONFIG_NET_L2_OPENTHREAD do exactly? How does it interfere with the gpio pins? 

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  • +1

    Hi Allan, 

    Sorry for the code snippet that I mistakenly had nRF52 in my mind while writing it. But yes You should have TASKS_XOSTART like you already figured out and waiting for the same event.

    Based on the logs it looks like the hardware is not starting the XO. Since the same code runs fine on the DK, I am almost certain that this is XO clock related on your module. 
    There are certain things that you need to check on your module

    • 32 MHz Crystal Mounted
       Heavy check mark Confirm that a 32 MHz crystal is actually mounted on the custom board.

    • Load Capacitors Matched
       Heavy check mark Check that the two load capacitors connected to the crystal are correctly sized according to the crystal’s datasheet (usually 8–12 pF) and match what's used on the DK.

    • Routing to XC1 and XC2
       Heavy check mark Verify that the crystal is connected to the correct pins (XC1 and XC2) on the chip and there are no routing errors.

    • No Series Resistors in the Oscillator Path
       Heavy check mark Ensure there are no resistors or other components in series between the chip and the crystal pins that could interfere with the oscillator function.

    • Proper Grounding Under Crystal
       Heavy check mark Check if there is a solid ground plane under the crystal area to ensure low impedance and reduce noise, similar to the DK layout.

    • Crystal Parameters (CL, ESR)
       Heavy check mark Confirm that the crystal used meets the Nordic recommendations — specifically check for the correct load capacitance (CL), equivalent series resistance (ESR), and drive level.

Reply
  • +1

    Hi Allan, 

    Sorry for the code snippet that I mistakenly had nRF52 in my mind while writing it. But yes You should have TASKS_XOSTART like you already figured out and waiting for the same event.

    Based on the logs it looks like the hardware is not starting the XO. Since the same code runs fine on the DK, I am almost certain that this is XO clock related on your module. 
    There are certain things that you need to check on your module

    • 32 MHz Crystal Mounted
       Heavy check mark Confirm that a 32 MHz crystal is actually mounted on the custom board.

    • Load Capacitors Matched
       Heavy check mark Check that the two load capacitors connected to the crystal are correctly sized according to the crystal’s datasheet (usually 8–12 pF) and match what's used on the DK.

    • Routing to XC1 and XC2
       Heavy check mark Verify that the crystal is connected to the correct pins (XC1 and XC2) on the chip and there are no routing errors.

    • No Series Resistors in the Oscillator Path
       Heavy check mark Ensure there are no resistors or other components in series between the chip and the crystal pins that could interfere with the oscillator function.

    • Proper Grounding Under Crystal
       Heavy check mark Check if there is a solid ground plane under the crystal area to ensure low impedance and reduce noise, similar to the DK layout.

    • Crystal Parameters (CL, ESR)
       Heavy check mark Confirm that the crystal used meets the Nordic recommendations — specifically check for the correct load capacitance (CL), equivalent series resistance (ESR), and drive level.

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