[Microbit-Python] UART Pins

Mon May 16 05:02:05 EDT 2016

Thanks Jonathan!

If as you say there is nothing on the SPI pins when I need an external UART I will probably use P14 MISO as UART Rx, P15 MOSI as UART Tx.

As far as a convention for using the 'major' GPIO pins for the UART my suggestion would be to use P1 & P2 as P0 is the default for generating audio.

Nevil

From: Jonathan.Austin at arm.com
To: microbit at python.org
Date: Sun, 15 May 2016 18:50:05 +0000
Subject: Re: [Microbit-Python] UART Pins

On 15 May 2016, at 17:22, Nevil Hunt <nevil.hunt at hotmail.co.uk> wrote:

Thanks David!

I take it using P3,4,5,6,7,9,10 or 11 would interfere with the LEDs & Switches on the micro:bit.

That’s correct - from the ‘DAL’ there’s a way to turn off the display to use these, if you really need them :)

Looking at https://microbit-micropython.readthedocs.io/en/latest/display.html I don’t see an equivalent from MicroPython - can anyone comment on whether there’s a
 way to do this?

What about using the SPI or I2C pins? Is there anything on the micro:bit hanging off any of these pins that would conflict with the UART?

The on-board accelerometer and magnetometer are hanging off I2C, but nothing on-board is using SPI, so you shouldn’t have any trouble using those :)

Do you think there’s value in a convention for tx/rx on the edge connector? Joe and I had previously discussed suggesting this is P0 and P1 (the first two big rings) which would allow two micro:bits to be turned face-to-face and connected through those
 rings and then talk to each other!

Jonny

Nevil

Date: Sun, 15 May 2016 11:44:18 +0100

From: david at thinkingbinaries.com

To: microbit at python.org

Subject: Re: [Microbit-Python] UART Pins

Read the docs ;-)

http://microbit-micropython.readthedocs.io/en/latest/uart.html

You can specify any
 other pins you want by passing the desired pin objects to the tx and rxparameters.

David

___________________________________________________________

David Whale, B.Sc (Hons), MIET

Software Engineer and IET Schools Liaison Officer, Essex

On 15 May 2016 at 11:09, Nevil Hunt <nevil.hunt at hotmail.co.uk> wrote:

Hi David,

My micro:bit diagram shows the I2C and SPI pins on the edge connector. Which are the UART Tx & Rx pins?

Nevil

Date: Sat, 14 May 2016 16:05:57 +0100

From: david at thinkingbinaries.com

To: microbit at python.org

Subject: Re: [Microbit-Python] Introducing myself

How about a BBC micro talking to a BBC micro:bit over serial? The RS422 interface at the back of the original beeb is just a UART. Need a level shifter, then bring into UART pins on the expansion pads at the bottom of the micro:bit and
 use MicroPython UART object.

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