Search found 400 matches

by mcauser
Wed Sep 18, 2019 10:37 am
Forum: Other Boards
Topic: VCC-GND STM32F407VET6 dev board
Replies: 24
Views: 17076

Re: VCC-GND STM32F407VET6 dev board

You could try requesting it from the seller on AliExpress. Alternatively, try to find the product on Taobao.com. Sometimes they have pan.baidu.com links to zips loaded with useful into, schematics, datasheets, etc, however sometimes only in Chinese, so you need to wash through a Google Translate. Th...
by mcauser
Fri Sep 06, 2019 5:02 am
Forum: Other Boards
Topic: [STM32F407VGT6] Board HELP!
Replies: 3
Views: 546

Re: [STM32F407VGT6] Board HELP!

I don't have one of these VGT6 boards. I do have a few VET6 ones. This might be a good starting point for creating your own board def: https://github.com/mcauser/BLACK_F407VE The VE has 512 Kbytes and the VG has 1 Mbyte flash. Other than that, pretty similar. See if you can grab a schematics pdf fro...
by mcauser
Tue Sep 03, 2019 3:14 pm
Forum: Pyboard D-series
Topic: PYBD missing from docs
Replies: 1
Views: 209

PYBD missing from docs

No mention of the Pyboard D-series on: http://docs.micropython.org
Anyone working on that?
by mcauser
Tue Sep 03, 2019 6:27 am
Forum: General Discussion and Questions
Topic: Recommendation of MCU for industrial device
Replies: 5
Views: 347

Re: Recommendation of MCU for industrial device

The ST docs list the pyboard's STM32F405RGT6 temperature range as -40 to 85 deg C. https://www.st.com/content/st_com/en/products/microcontrollers-microprocessors/stm32-32-bit-arm-cortex-mcus/stm32-high-performance-mcus/stm32f4-series/stm32f405-415/stm32f405rg.html The 3 new Pyboard D-series, SF2W (S...
by mcauser
Mon Sep 02, 2019 11:32 am
Forum: Other Boards
Topic: [DS-D6] build for cheap DS-D6 nrf52 fitness tracker
Replies: 18
Views: 1022

Re: [DS-D6] build for cheap DS-D6 nrf52 fitness tracker

I’m guessing because it’s a 128x32, there is a different init command to set the row offset. Most other 128x32s are positioned half way down in the 128x64 buffer.
by mcauser
Fri Aug 23, 2019 9:59 am
Forum: Drivers for External Components
Topic: Displays with driver subclassed from framebuf
Replies: 30
Views: 2640

Re: Displays with driver subclassed from framebuf

With all this talk of creating display drivers in C...
Can one written in C subclass the Framebuf?
by mcauser
Thu Aug 22, 2019 3:11 pm
Forum: Drivers for External Components
Topic: HX1230 96x68 Mono LCD - Nokia 5110 killer
Replies: 6
Views: 254

Re: HX1230 96x68 Mono LCD - Nokia 5110 killer

Updated to pack 8 data bytes into 9 bytes, with a byte of DC bits.

On ESP8266, full screen writes (864 bytes) are now more than 2x faster, without writing all of those padding bits.

CPU running at 80mhz
Before: 241,105 us
After: 114,265 us

CPU running at 160mhz
Before: 168,606 us
After: 63,752 us
by mcauser
Wed Aug 21, 2019 2:42 am
Forum: Other Boards
Topic: [DS-D6] build for cheap DS-D6 nrf52 fitness tracker
Replies: 18
Views: 1022

Re: [DS-D6] build for cheap DS-D6 nrf52 fitness tracker

Nice work @fanoush!
I ordered 2x from GearBest. That promo code "MPOWDS-D6" saved me a few extra bucks. Thanks for that!
by mcauser
Tue Aug 20, 2019 7:28 am
Forum: Drivers for External Components
Topic: HX1230 96x68 Mono LCD - Nokia 5110 killer
Replies: 6
Views: 254

Re: HX1230 96x68 Mono LCD - Nokia 5110 killer

@Roberthh I tried squishing it like that, but couldn't get it working.

Edit: Tried again tonight and it worked this time!
Now I just need to figure out how to pack 1 extra bit before every 8th bit, efficiently.
by mcauser
Tue Aug 20, 2019 5:49 am
Forum: Drivers for External Components
Topic: HX1230 96x68 Mono LCD - Nokia 5110 killer
Replies: 6
Views: 254

Re: HX1230 96x68 Mono LCD - Nokia 5110 killer

I've been mucking around with this display and found the Nokia 5110 display to be significantly faster. Having to send the 9-bit SPI as 16 bytes means tons of wasted bytes being sent. 96 * 72 / 8 * 7 = 6048 extra padding bits for a full screen refresh. If I can figure out how to send multiple sequen...