ESP32 Forum

Hi,

I purchased and received 3k ESP32-D2WD and 3k ESP-PSRAM64 chips.

I'm designing a board with the ESP32-D2WD and with the ESP-PSRAM64.

At page 9 of the 2.5 version of the datasheet I'm reading this:

"ESP32-D2WD’s pins GPIO16, GPIO17, SD_CMD, SD_CLK, SD_DATA_0 and SD_DATA_1 are used for connecting
the embedded flash, and are not recommended for other uses."

source: https://www.espressif.com/sites/default ... eet_en.pdf


QUESTION 1
Can I use the ESP-PSRAM64 with the ESP32-D2WD?
if yes, how can I glue them?

QUESTION 2
Did you address the internal flash memory in the address space of the PSRAM??????

Best regards,
Enrico Migliore

1. Use sd_data_2 and sd_data_3, but it is not supported yet so you have to modify idf code
2. No

Dear WiFive,

thank you for your reply.

I'll wait for the IDF to support the ESP-PSRAM64.

Thanks,
Enrico Migliore

Hi,

Any update on this PSRAM64 support in idf?

There's an update waiting to be integrated in master. Note that the upper 4MiB are only supported using a bankswitching scheme, they're not accessible using normal malloc()/free() like the lower 4MiB are.

So If we use those pins for the PSRAM, we won't be able to use the SDcard in 4-bit interface mode anymore, right?

No, sd card uses hs2 pins