Search found 23 matches

by RobH
Thu Aug 06, 2020 10:04 am
Forum: Other Boards
Topic: WeAct STM32F411CEU6 black pill
Replies: 19
Views: 7031

Re: WeAct STM32F411CEU6 black pill

rcolistete wrote:
Wed Aug 05, 2020 3:49 pm
'gc.mem_free()' shows the free RAM, not the free space in file system on flash memory.
Ah, I wasn't aware of that! And indeed, when I examine the 'disk' space I see 17MB free!
Thanks!
Rob.
by RobH
Wed Aug 05, 2020 11:48 am
Forum: Other Boards
Topic: WeAct STM32F411CEU6 black pill
Replies: 19
Views: 7031

Re: WeAct STM32F411CEU6 black pill

The SPI flash pins are exposed on the side pins, so you have the option of experimenting with a few flash sizes, until you are happy to solder one on. I have followed the instructions to build the firmware (1.12-662) with additional 16MB flash and connected an external board with W25Q128. After upl...
by RobH
Sat Aug 01, 2020 8:30 am
Forum: Other Boards
Topic: [WEACT_STM32F411CEU6] unable to re-flash firmware
Replies: 0
Views: 482

[WEACT_STM32F411CEU6] unable to re-flash firmware

A few days ago I received my black-pill and I succeeded to build and flash Micropython V1.12-623 (without any extra flash), mem_free() shows 97600. I mounted external flash (on a separate board with M25Q128 connected as described in Readme.md), modified the mpconfigboard.h file as indicated and re-b...
by RobH
Fri Jun 05, 2020 12:00 pm
Forum: General Discussion and Questions
Topic: 'P2' through 'P5' missing in machine.Pin.board
Replies: 1
Views: 208

'P2' through 'P5' missing in machine.Pin.board

I wondered what could be the reason that the names P2 to P5 are not present in machine.Pin.board and pyb.Pin.board.
This seems an exception: all other orange coloured pins (on the PYBv1.1 picture) are defined.
Rob.
by RobH
Mon May 11, 2020 11:51 am
Forum: MicroPython pyboard
Topic: Consistent bitflips when using pyboard as SPI slave and other SPI weirdnesses
Replies: 14
Views: 5130

Re: Consistent bitflips when using pyboard as SPI slave and other SPI weirdnesses

Thank you Peter for your suggestion! Interesting I2C implementation! I didn't mention in my post that my coupling of 2 pyboards with SPI had as primary purpose to learn how to build an SPI-slave. My experiences so far and the comments in the forums are not encouraging! And since persevering might re...
by RobH
Sat May 09, 2020 7:31 pm
Forum: MicroPython pyboard
Topic: Consistent bitflips when using pyboard as SPI slave and other SPI weirdnesses
Replies: 14
Views: 5130

Re: Consistent bitflips when using pyboard as SPI slave and other SPI weirdnesses

Hi, I'm trying to use two PyBoards as SPI master-slave combo and have a similar problem as mentioned by the OP. When the master sends "01234567", the slave receives "`bdfhjln". When looking at the bit pattern the received data is shifted 1 bit left. Look for example the last character: ord('7') = 55...
by RobH
Tue Apr 21, 2020 8:01 am
Forum: Other Boards
Topic: Teensy 4.0 & 4.1
Replies: 21
Views: 7991

Re: Teensy 4.0

I'm curious about any progress of MicroPython for the Teensy 4.0..... Did a performance comparison with MicroPython on an ESP32 and CircuitPython on a Teensy 4.0 with (to me) surprising results. pystone_lowmem.py: ESP32 1057 pystones/sec pystone_lowmem_monotonic.py: Teensy 4.0 1087 pystones/sec So w...
by RobH
Sun Jun 09, 2019 5:27 pm
Forum: General Discussion and Questions
Topic: connecting to hidden WLAN
Replies: 3
Views: 1021

Re: connecting to hidden WLAN

@ Iepi
I'm sorry, no solution yet (and I myself didn't experiment further...)
Regards
by RobH
Fri Feb 15, 2019 1:49 pm
Forum: Drivers for External Components
Topic: Anyone working on a MAX7219 8x8 LED matrix display library?
Replies: 37
Views: 15069

Re: Anyone working on a MAX7219 8x8 LED matrix display library?

@mcauser, suggestion for enhancement. I have a couple of PCBs with a single monochrome 8x8 matrix and a max7219 'outside' of the PCB, probably the same as you show in a picture you posted in this forum (1 Oct 2017). With 3 of these I would like to build a 24(hor.) x 8(vert.) matrix by mounting these...
by RobH
Sun Nov 18, 2018 7:40 pm
Forum: ESP8266 boards
Topic: ESP8266 configuring AP channel
Replies: 2
Views: 759

Re: ESP8266 configuring AP channel

Aha! I wasn't aware of this restriction. Thanks! It explains what I experienced. Apart from the AP I have also a STA active. And when there can be only 1 WLAN channel it will be dictated by the AP to which the STA is connected. Some more experimenting showed that deactivating or even only disconnect...