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...

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 ...

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.

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

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...

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...

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...

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"...

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.

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...