8000 ESP32-S2 SPI speed varies during development · Issue #3690 · adafruit/circuitpython · GitHub
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emard opened this issue Nov 13, 2020 · 2 comments
Open

ESP32-S2 SPI speed varies during development #3690

emard opened this issue Nov 13, 2020 · 2 comments
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espressif applies to multiple Espressif chips performance
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Long term

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@emard
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emard commented Nov 13, 2020 •
edited by dhalbert
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Fast performer is this:

adafruit-circuitpython-espressif_saola_1_wrover-en_US-20201027-563a893.bin
>>> import ecp5f;ecp5f.flash("sdbridge25f.bit",0x200000)
102400 bytes uploaded in 1701 ms (60 kB/s)
4K blocks: 25 total, 0 erased, 0 written.
True
>>> import ecp5f;ecp5f.flash("sdbridge25f.bit",0x201000)
102400 bytes uploaded in 8098 ms (12 kB/s)
4K blocks: 25 total, 24 erased, 24 written.
True

This one is 2-3x slower:
adafruit-circuitpython-espressif_saola_1_wrover-en_US-20201113-8d3a878.bin
@tannewt
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tannewt commented Nov 13, 2020

Can you please be more specific? Were these examples run one after another? Please provide a test case that uses busio.SPI directly.

Running a python library will have a lot of variation in timing. We make no promises that the timing of python is consistent.

@tannewt tannewt added this to the Long term milestone Nov 13, 2020
@tannewt tannewt added espressif applies to multiple Espressif chips performance labels Nov 13, 2020
@emard
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emard commented Nov 13, 2020 via email

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