Search found 91 matches

by chuckbook
Fri Aug 24, 2018 11:10 am
Forum: General Discussion and Questions
Topic: Calculation benchmark of micropython in different hardware
Replies: 14
Views: 1450

Re: Calculation benchmark of micropython in different hardware

pythoncoder wrote:
Fri Aug 24, 2018 7:40 am
Interesting and informative information. It will be interesting to see how the forthcoming Pyboard D-series compares.
without warranty: 216M, 1.547, 1.721, 2.839, 4.116 :-)
by chuckbook
Wed Jul 25, 2018 8:03 am
Forum: General Discussion and Questions
Topic: Pyboard + SSD1306
Replies: 26
Views: 2859

Re: Pyboard + SSD1306

Just use:

Code: Select all

i2c.writeto(0x70, b'\x01')
instead of:

Code: Select all

i2c.writeto(0x70, 0x01)
by chuckbook
Tue Jul 17, 2018 4:44 pm
Forum: Newsletter archive
Topic: MicroPython Newsletter Issue 3
Replies: 3
Views: 1713

Re: MicroPython Newsletter Issue 3

Thanks for sharing this information. I finally figured out why we chose MicroPython!
Take my respect!
by chuckbook
Tue Jul 03, 2018 11:42 am
Forum: Other Boards
Topic: [pyb.ADCAll()] strange results
Replies: 3
Views: 511

Re: [pyb.ADCAll()] strange results

Self calibration for F4 & F7 means evaluation of Vref by means of factory calibration parameters for temp sensor and internal band-gap reference. It has nothing to do with ADC calibration.
by chuckbook
Mon Jul 02, 2018 4:46 pm
Forum: Other Boards
Topic: [pyb.ADCAll()] strange results
Replies: 3
Views: 511

Re: [pyb.ADCAll()] strange results

Be aware of the fact that so far only a limited number of MCUs (F405, F411, F7xx) are supported when it comes to internal voltage readout and self calibration.
by chuckbook
Mon Jun 18, 2018 8:00 am
Forum: General Discussion and Questions
Topic: uctypes and spi
Replies: 5
Views: 539

Re: uctypes and spi

CCM RAM is not accessible via DMA.
DocID018909 Rev 10, 2.1, pp 59
by chuckbook
Tue May 22, 2018 3:28 pm
Forum: General Discussion and Questions
Topic: RTC (Clock) is too slow on PyBoard Lite v1.0 with accelrometer
Replies: 6
Views: 712

Re: RTC (Clock) is too slow on PyBoard Lite v1.0 with accelrometer

It should be mentioned that PYBLITE doesn't use a crystal for the RTC but an RC oscillator. However, it is pretty easy to solder in a TH crystal.
by chuckbook
Tue Apr 10, 2018 9:22 am
Forum: General Discussion and Questions
Topic: CPython/MicroPython returns different result of time.localtime()
Replies: 2
Views: 487

Re: CPython/MicroPython returns different result of time.localtime()

MPY epoch is 2000-01-01 instead of unix epoch, which is 1970-01-01.

Code: Select all

>>> time.localtime(1523338307-time.UNIX_TIME)
(2018, 4, 10, 6, 31, 47, 1, 100)
Note:
I'm not sure if time.UNIX_TIME is defined in the master repository. It is just a constant

Code: Select all

>>> time.UNIX_TIME
946681200
by chuckbook
Fri Apr 06, 2018 11:00 am
Forum: MicroPython pyboard
Topic: Controlling Slew Rate of GPIO
Replies: 13
Views: 2007

Re: Controlling Slew Rate of GPIO

If I remember correctly the (usually unwanted) parasitic capacity from overlapping gate and drain is indeed called Miller capacity.
by chuckbook
Thu Apr 05, 2018 8:04 am
Forum: MicroPython pyboard
Topic: Controlling Slew Rate of GPIO
Replies: 13
Views: 2007

Re: Controlling Slew Rate of GPIO

BTW, it is interesting that Rds seems to be constant. So I guess it is just a variation of the gate area or using multiple gates.