QUESTION - ESP32-D2WD + External ESP-PSRAM64

[wwwenrico]

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

[WiFive]

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

[wwwenrico]

Dear WiFive,

thank you for your reply.

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

Thanks,
Enrico Migliore

[kmakhil90]

Hi,

Any update on this PSRAM64 support in idf?

[ESP_Sprite]

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.

[thethinker]

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?

[WiFive]

No, sd card uses hs2 pins