Search found 168 matches

by rhubarbdog
Fri Mar 29, 2019 8:37 am
Forum: MicroPython pyboard
Topic: File io at a lower irq
Replies: 0
Views: 1913

File io at a lower irq

I have a proposed program which will perform some point to point comms between 2 pyboards running an a callback say on the rising edge of a pin. One of the boards writes data to disc. I'd like this file io to be interrupted and my callback serviced. What are the issues in having lower irq file io sa...
by rhubarbdog
Fri Mar 29, 2019 1:36 am
Forum: micro:bit boards
Topic: Neopixel RGBW
Replies: 21
Views: 16257

Re: Neopixel RGBW

The only way you can interface these led with micropython on microbit it arm thumb2 assembly or
Possibly using the spi bus in a similar way
to this . The code is for the pyboard but isn't too difficult to translate. Notice the colours are specified in gbr not rgb.
by rhubarbdog
Thu Mar 28, 2019 12:20 am
Forum: MicroPython pyboard
Topic: logging data on SD at constant frequency
Replies: 13
Views: 14122

Re: logging data on SD at constant frequency

I've done some work with 2 pyboard 1.1 communicating via uart. I have acheived speeds of 2.6kHz with good consistency of period. The programs an classes can be found in the high-frequency-data-logger repository on GitHub
by rhubarbdog
Wed Mar 27, 2019 10:24 am
Forum: MicroPython pyboard
Topic: Why does my REPL session always have this output
Replies: 7
Views: 5393

Why does my REPL session always have this output

When a program terminates and I have a serial terminal open why do I always have this output. I have other micropython devices they just print Micropython version details and the >>> prompt. Type "help()" for more information. >>> AT^SQPORT? Traceback (most recent call last): File "<stdin>", line 1 ...
by rhubarbdog
Wed Mar 27, 2019 8:35 am
Forum: micro:bit boards
Topic: Neopixel RGBW
Replies: 21
Views: 16257

Re: Neopixel RGBW

The neopixel module is written in arm thumb2 assembly i think
by rhubarbdog
Tue Mar 26, 2019 9:36 am
Forum: micro:bit boards
Topic: Neopixel RGBW
Replies: 21
Views: 16257

Re: Neopixel RGBW

Ask about upcoming functionality by logging an issue on github
by rhubarbdog
Mon Mar 25, 2019 5:59 pm
Forum: MicroPython pyboard
Topic: Why is my timer erratic?
Replies: 10
Views: 5809

Re: Why is my timer erratic?

Setting the frequency to 800Hz . 25% are at the short time af 1000 micro seconds 200 rather than 1250.
by rhubarbdog
Mon Mar 25, 2019 5:15 pm
Forum: micro:bit boards
Topic: Neopixel RGBW
Replies: 21
Views: 16257

Re: Neopixel RGBW

What's the part number of your rgbw LED?
by rhubarbdog
Mon Mar 25, 2019 5:11 pm
Forum: micro:bit boards
Topic: Neopixel RGBW
Replies: 21
Views: 16257

Re: Neopixel RGBW

Regarding you looking for an IDE have you thought of Mu editor.
It has been written for microbit and other python environments.
There's a button to start REPL (read-eval-print-loop) and one to facilitate file transfer between host computer and microbit
by rhubarbdog
Mon Mar 25, 2019 7:59 am
Forum: MicroPython pyboard
Topic: Speed of uart
Replies: 8
Views: 6310

Re: Speed of uart

I found spi prone to dropping packets. I wrote a little dummy program passing data between SPI(2) and SPI(1) on one pyboard.
What I'm doing the reciever is busy writing data to SD card i have a big buffer on my uart (16kb)