Search found 45 matches

by PaulFreund
Mon Nov 09, 2020 12:35 pm
Forum: General Discussion
Topic: ESP32-PICO-D4 Chip revision and pSRAM limitations
Replies: 16
Views: 2264

ESP32-PICO-D4 Chip revision and pSRAM limitations

I have a project that migrated from ESP32-WROOM to ESP32-PICO-D4 + external pSRAM recently and am experiencing some spurious random crashes without meaningfull traces since that. Because of that I investigated a little bit and came up with some questions. 1. Which "ECO" revision is the PICO-D4? With...
by PaulFreund
Tue Jul 07, 2020 4:19 pm
Forum: ESP-IDF
Topic: ESP32 PICO D4 psram: VDDSDIO is not 3.3V
Replies: 0
Views: 585

ESP32 PICO D4 psram: VDDSDIO is not 3.3V

Hi, I have a new board with PICO D4 processor and external pSRAM. VDD_SDIO is connected to external 3.3V (measured 3.15 at runtime, the other working board measures 3.18) and IO12 is floating. ESP-IDF is at tags/v4.1-beta2. I have worked with the board the whole day and everything was fine. RAM was ...
by PaulFreund
Tue Jul 23, 2019 6:12 pm
Forum: General Discussion
Topic: Availability of ESP-PSRAM64H
Replies: 3
Views: 2353

Re: Availability of ESP-PSRAM64H

Is this the same product with a different packaging? My primary reasoning for going with the espressif chip was the hope to get the best tested chip PSRAM chip.
by PaulFreund
Tue Jul 23, 2019 2:07 pm
Forum: General Discussion
Topic: Availability of ESP-PSRAM64H
Replies: 3
Views: 2353

Availability of ESP-PSRAM64H

Hi,

I have been searching the usual suspects like Digikey, Farnell, etc. and also our supplier in Germany Mouser which has most of your products but I was unable to find a supplier that sells the ESP-PSRAM64H to be used together with the PICO-D4.

Did I overlook something?

Best regards,

Paul
by PaulFreund
Thu Jul 18, 2019 12:27 pm
Forum: General Discussion
Topic: Missing Pin descriptions in esp32-pico-d4_datasheet_en.pdf (v1.5)
Replies: 0
Views: 728

Missing Pin descriptions in esp32-pico-d4_datasheet_en.pdf (v1.5)

I am currently cross referencing pins from a D0WD design to a PICO-D4 design and noticed that a lot of the I/O pin descriptions like IO0, IO4 are missing GPIO0, GPIO4 in the function list compared to the D0WD.As GPIO0 for example is also a strapping pin on PICO-D4 I assume that I can still use IO0 w...
by PaulFreund
Tue Jul 09, 2019 1:31 pm
Forum: General Discussion
Topic: Usage of input only pins as Rx lines
Replies: 1
Views: 1206

Usage of input only pins as Rx lines

Hi, before working on a new design I wanted to make sure that the following is possible. The pins GPIO36, GPIO37, GPIO38, GPIO39, GPIO34 and GPIO35 are marked as input only in the IO_MUX documentation of the ESP32 specification on page 49. Can those pins be used as UART Rx and SPI MISO for example w...
by PaulFreund
Tue Jul 02, 2019 6:34 pm
Forum: General Discussion
Topic: Asynchronous webserver with websockets
Replies: 4
Views: 3876

Re: Asynchronous webserver with websockets

I would suggest using https://github.com/chmorgan/libesphttpd which is a continuation of Spritetm's libesphttpd. By default it is processing in a FreeRTOS task and can handle multiple connections simultaneously. It is async to the degree that in every cycle polling for data all client sockets are pr...
by PaulFreund
Tue Feb 05, 2019 7:09 am
Forum: General Discussion
Topic: MicroSD hangup
Replies: 19
Views: 8191

Re: MicroSD hangup

Unfortunately I am only now getting to work on this again. I noticed one thing and am wondering where it came from. I could not find something in the simplified SD spec but the example notes here https://github.com/espressif/esp-idf/tree/master/examples/storage/sd_card state: "10k pullup in SD mode"...
by PaulFreund
Wed Nov 21, 2018 10:40 pm
Forum: General Discussion
Topic: MicroSD hangup
Replies: 19
Views: 8191

Re: MicroSD hangup

For completenes I attached some scope shots of the signal. The series resistors are not optimal for 20MHz, better with 10MHz or lower but even then the issue persists.
MicroSD_Scope.zip
(318.96 KiB) Downloaded 192 times
by PaulFreund
Fri Nov 16, 2018 9:39 pm
Forum: General Discussion
Topic: MicroSD hangup
Replies: 19
Views: 8191

Re: MicroSD hangup

Unfortunately lowering the speed also did not help :( I'm also trying to find simple reproduction code or procedure but so far it only happens in the field after some hours and my test device that was able to reproduce sometimes was accidentially sent to another plant :lol: Next thing I will do is c...

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