Search found 614 matches

by PeterR
Thu Apr 08, 2021 5:46 pm
Forum: General Discussion
Topic: SPI DMA in ESP32-S2-WROOM
Replies: 4
Views: 230

Re: SPI DMA in ESP32-S2-WROOM

Keep in mind that DMA can be counter productive for small transfers. One of my SPI channels is a cheap MPC2515 and that is a very chatty device with between 3 and 8 byte transfers. Latency & setup really kill that through put. On the short transfers I measured that no DMA was faster. Basically the S...
by PeterR
Tue Apr 06, 2021 11:29 pm
Forum: General Discussion
Topic: The future of ESP32 hardware revision(fixing annoying hardware issues?)
Replies: 7
Views: 440

Re: The future of ESP32 hardware revision(fixing annoying hardware issues?)

Qualcomm and NXP seem to offer solutions (but still below Espressif in terms in functionality and cost) Exactly, 'you pays your money....' So (basically) finding a silicon sweet spot is very tricky! Also very tricky for anyone else to review that trade without knowing your ram/flash etc requirement...
by PeterR
Thu Apr 01, 2021 5:49 pm
Forum: General Discussion
Topic: Prefered Communication Form (Protocol) for Data exchange between Android App and ESP32
Replies: 3
Views: 265

Re: Prefered Communication Form (Protocol) for Data exchange between Android App and ESP32

I think my earlier posts will just repeat what I said. SPP is an ESP BT example I think. There is not a BLE SPP profile. There are plenty of examples about emulating SPP over BLE however. I seem to remember that I copied an STM32 application guide. This coupled with the ESP examples gave me the mean...
by PeterR
Wed Mar 31, 2021 11:23 pm
Forum: General Discussion
Topic: How to compile sqlite3 for esp32?
Replies: 2
Views: 215

Re: How to compile sqlite3 for esp32?

Search for ioctrl.h in the ESP folder. If it does not exists download and add somewhere (but eventually this might cause other issues which you then have to resolve). Next & also if IDF has icotrl.h you need to update your search path. In your 'component.mk' add something like: COMPONENT_ADD_INCLUDE...
by PeterR
Wed Mar 31, 2021 10:55 pm
Forum: General Discussion
Topic: Gripes on ESP32/ESP-IDF
Replies: 51
Views: 24949

Re: Gripes on ESP32/ESP-IDF

'The chip and firmware may be "fine"' Maybe but are not. CAN silicon is especially an issue for me. Have acceptable IDF patches (thank you ESP) on my IDF revision but then ESP refactor between versions with huge changes & my patches no longer works & I do not have a clear/easy route forward. So the...
by PeterR
Wed Mar 31, 2021 10:22 pm
Forum: General Discussion
Topic: Prefered Communication Form (Protocol) for Data exchange between Android App and ESP32
Replies: 3
Views: 265

Re: Prefered Communication Form (Protocol) for Data exchange between Android App and ESP32

Well it depends on your bandwidth needs/requirements. BLE/BT would be a good starter using SPP if linking to a phone. Look at this way, how may Phone periperals use Wifi? Why do you think Wifi? If point to point then BLE/BT might be better. Regardless of transport link you need to be clear about lat...
by PeterR
Mon Mar 22, 2021 11:03 pm
Forum: ESP-IDF
Topic: ESP32 and ethernet controller DM9051 stop working
Replies: 2
Views: 533

Re: ESP32 and ethernet controller DM9051 stop working

As I read this; it does not work at volume on your board. I did not hear you say that it works at volume on an EVB.
Plz clarify. A simple trueth table would help.
When I read 'custom' its a fair bet to ask OP to post the 'custom' code or schematics. Post your schematics.
by PeterR
Fri Mar 19, 2021 6:34 pm
Forum: General Discussion
Topic: Multiple ESP32 through ethernet with ENC28J60 RJ45
Replies: 3
Views: 715

Re: Multiple ESP32 through ethernet with ENC28J60 RJ45

10Hz few bytes is not a problem. Thats like 1KB (forget minimum packet size). Go with your original idea IF you have a driver/transport layer which works with the ESP32 IDF. UDP or TCP? Well that depends (again). If you want all the data (only lose data in unacceptable long term hung scenarios) then...
by PeterR
Wed Mar 17, 2021 10:51 pm
Forum: General Discussion
Topic: SPIFFS clarification please
Replies: 2
Views: 185

Re: SPIFFS clarification please

I suspect that a little seeding on your part would be quicker than any one else unraveling your question.
You can fstat a partition and so work out how your config relates to the FS etc.
Or just a whole set of fopens working through the possible paths strings and printing the return code.....
by PeterR
Mon Mar 15, 2021 7:09 pm
Forum: General Discussion
Topic: LilyGO/LilyGO-T-SIM7000G + HX711 or ADS1232 wiring
Replies: 5
Views: 505

Re: LilyGO/LilyGO-T-SIM7000G + HX711 or ADS1232 wiring

Its not clear what you are asking. I had a quick look at the HX711 reference manual (not the biggest manual!) & there is no mention of calibration parameters or indeed soft configuration. What exactly stops you waking from sleep, wake and reading a value? Perhaps you need to use a GPIO to hold the H...

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