www.infor-link.com NRF52832 with Espruino

[espruino-discuss]

Posted at 2017-12-01 by vb

Hello!
I'm able to flash Espruino to this www.infor-link.com NRF52832. Board very simular to MDBT42Q from Puck.js - just chip and several passive components on pcb.
I try espruino_1v94_nrf52832.hex and espruino_1v94_puckjs.hex from resent travis build.
BLE part working - nRF Connect able to connect to board.

But i'm unable to connect to board using UART - no any output at 9600 or any other speed.
Do i need any external components like pull-up resistors or anything else?

[espruino-discuss]

Posted at 2017-12-01 by @gfwilliams

That's interesting - the UART should work fine for you. However see: http://www.espruino.com/Puck.js#serial-console

You need to have the UART RX pin pulled high (the idle state) when the firmware boots up. Enabling the UART uses lots of power (the chip can't sleep properly), so it's not done automatically.

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Posted at 2017-12-01 by vb

Is it same for NRF52832DK?

And there is error somewhere:
from site:
When power is first applied, Puck.js checks if pin D28 is at 3.3v (which will be the case if it is connected to a Serial port's transmit line)
forom PUCKJS.py
'D29' : "If pulled up to 1 on startup, D28 and D29 become Serial1",

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Posted at 2017-12-01 by @gfwilliams

Thanks - just updated that.

NRF52832DK is the same I think, but the pins are different - check the BOARD.py file for which ones.

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Posted at 2017-12-01 by vb

For NRF52832DK there is no note in NRF52832DK.py.
Can you suggest where to look in sources for UART initialization in such way?

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Posted at 2017-12-01 by @gfwilliams

https://github.com/espruino/Espruino/blob/master/boards/NRF52832DK.py#L23 ?

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Posted at 2017-12-01 by vb

No :) I'm not about Pin definitions. I'm about high level on RX for UART enabling.

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Posted at 2017-12-01 by vb

OK. All works well. On bare NRF52832 board with espruino_1v94_nrf52832.hex RX must be high at boot.