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Connect RN2483 RST to uC #13

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dbrgn opened this issue Mar 29, 2018 · 5 comments
Closed

Connect RN2483 RST to uC #13

dbrgn opened this issue Mar 29, 2018 · 5 comments
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@rnestler
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PCB v2.0

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@dbrgn
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dbrgn commented Mar 29, 2018

Make it possible to reset RN2483 from microcontroller.
@rnestler rnestler transferred this issue from gfroerli/hardware Jun 15, 2019
@dbrgn dbrgn self-assigned this Oct 19, 2019
dbrgn added a commit that referenced this issue Oct 19, 2019
@dbrgn
Connect RN reset pin to PA4
a106bb9 
The NRST pin is pulled up using the pull-up resistor R1. It's also
connected to the PA4 pin of the microcontroller.

By default, after reset, the GPIO pins of the uC are configured as
floating inputs (see datasheet table 14). If we enable the pull-down
resistor on PA4, we should be able to reset the RN module.

Refs #13
@dbrgn
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dbrgn commented Oct 19, 2019

Connected the RN NRST pin to PA4 of the uC in a106bb9.

TODO:

  • @rnestler can you confirm that this should work? (See commit message)
  • We should test this using the nucleo devboard.

dbrgn added a commit that referenced this issue Dec 2, 2019
@dbrgn
Place USB connector and R1 resistor (#13)
7f02eae
@dbrgn dbrgn assigned rnestler and dbrgn and unassigned dbrgn and rnestler Dec 2, 2019
@dbrgn dbrgn added this to the PCB v2.0 milestone Dec 7, 2019
@rnestler
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rnestler commented Dec 7, 2019

From the commit message:

By default, after reset, the GPIO pins of the uC are configured as
floating inputs (see datasheet table 14). If we enable the pull-down
resistor on PA4, we should be able to reset the RN module.

Uhm what? If you have a pull up and a pull-down it will be a voltage in between the logic levels which may not work or even break stuff.
Why not do the obvious thing and configure it as an open drain output and set it to 0 to reset?

@rnestler
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rnestler commented Dec 7, 2019

We should test this using the nucleo devboard.

That's probably a smart thing to do anyways :)

@dbrgn
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dbrgn commented Dec 7, 2019

Why not do the obvious thing and configure it as an open drain output and set it to 0 to reset?

Uhh, that's what I meant to write 😅

@dbrgn
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dbrgn commented Dec 10, 2019

We don't have the Nucleo board at hand, so we'll trust that it works 🙂

@dbrgn dbrgn closed this as completed Dec 10, 2019
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