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by PeterR
Sat Jan 23, 2021 1:43 am
Forum: General Discussion
Topic: Dual Core Synchronization
Replies: 2
Views: 165

Re: Dual Core Synchronization

Guessing: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/intr_alloc.html the interrupt they generate is hard-wired to their associated core; it’s not possible to have e.g. an internal timer comparator of one core generate an interrupt on another core. That is why th...
by PeterR
Mon Jan 18, 2021 11:57 pm
Forum: General Discussion
Topic: SDS011 particle sensor
Replies: 1
Views: 313

Re: SDS011 particle sensor

What do you have connected to 5V vin i.e. what power source? The device needs around 70mA & so should be good with most power supplies. ESP gets a little dodgy on USB power when running hot and with peripherals. An external PSU is recommended. Is the device 5V or 3.3V logic? You might need level shi...
by PeterR
Sun Jan 10, 2021 10:43 pm
Forum: General Discussion
Topic: How to use SPI of esp32 to read ADC samples periodically with fixed sample rate?
Replies: 5
Views: 1860

Re: How to use SPI of esp32 to read ADC samples periodically with fixed sample rate?

You will find this hard to impossible with an ESP depending on exactly what other I/O etc you use. The ESP has bus contension issues. Now the above does depend on if you can tolerate occasional (say) 2mS drop outs. 400 KHz ->25 uS. AFAIR it takes 10 uS+ to set up a SPI DMA. You could pre-allocate th...
by PeterR
Sun Jan 10, 2021 10:22 pm
Forum: General Discussion
Topic: SD card with SPI adapter
Replies: 6
Views: 1992

Re: SD card with SPI adapter

20 Mhz seems a lot. 10 Mhz might be pushing it. Unfortunately there are a lot of clone cards. I developed a product with an SD card & during reasearch bought many cards from a variety of suppliers from Amazon, ebay etc. Each supposed OEM card bought either at different times or from different suppli...
by PeterR
Sun Jan 10, 2021 10:10 pm
Forum: General Discussion
Topic: ESP32: Guru Meditation Error: Core 1 panic'ed (StoreProhibited)
Replies: 1
Views: 183

Re: ESP32: Guru Meditation Error: Core 1 panic'ed (StoreProhibited)

All the line numbers are posted, so post the source files! On a 30 second scan I could not see any pointer use, no mallocs etc & 9 out of 10 exceptions are stack related. Bump your stack. If that still sucks then post the source files, like C:\Users\Tom\Documents\Arduino\libraries\FastLED-3.4.0\src\...
by PeterR
Wed Jan 06, 2021 6:27 pm
Forum: General Discussion
Topic: New user issues with ESP32 and a SD Card Reader
Replies: 9
Views: 549

Re: New user issues with ESP32 and a SD Card Reader

Some code might help! I have used an SD card on ESP32 (using a hacked Ardunio driver) without issue - and I test hard. My only 'quick win' thought is that you should wind SPI clock speed back to say 1 MHz and then work up. ESP32 peripherals are slower than you might expect & GPIO muxing does not hel...
by PeterR
Thu Dec 31, 2020 11:32 pm
Forum: General Discussion
Topic: ESP32 GPIO Input Hysteresis (Schmitt Trigger)?
Replies: 4
Views: 443

Re: ESP32 GPIO Input Hysteresis (Schmitt Trigger)?

Not tried TWI on ESP before. SPI should do it. You can figure the mode. Some edge cases on hard wiring CS to figure but doable. Trouble is you have 4-6 asynchronous sources & you do not have 6 SPI devices on the ESP. 25MHz is also probably too fast if you use the ESP GPIO mux (use non native SPI pin...
by PeterR
Tue Dec 29, 2020 10:29 pm
Forum: General Discussion
Topic: ESP32 GPIO Input Hysteresis (Schmitt Trigger)?
Replies: 4
Views: 443

Re: ESP32 GPIO Input Hysteresis (Schmitt Trigger)?

You should really describe your original problem along with question.
No schmitt but a software latch, counter, RMT might work just as well (depending on you're actual problem).
by PeterR
Wed Dec 23, 2020 4:32 pm
Forum: ESP-IDF
Topic: Issues when using SPI SD card
Replies: 10
Views: 1222

Re: Issues when using SPI SD card

Well the datasheet says that it has a level convertor but does not show you how to use 3.3V.
I would hunt for a tutorial.

If you run 5V into an ESP pin then the ESP won't love you for long.
by PeterR
Mon Dec 21, 2020 1:30 am
Forum: General Discussion
Topic: MQTT connection fails when using static IP
Replies: 1
Views: 253

Re: MQTT connection fails when using static IP

The MQTT over web socket assumes that everything is in a single ethernet packet as I recall. If you are using websockets then check my posts, there is a patch in there somewhere. Perhaps the same issue exists with other transports? There is not enougth in your log for me to work with. Why the first ...

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