QUESTION - ESP32-D2WD + External ESP-PSRAM64

wwwenrico
Posts: 22
Joined: Thu Apr 26, 2018 9:29 am
Location: Italy

QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby wwwenrico » Wed Aug 29, 2018 1:25 pm

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
Posts: 2066
Joined: Tue Dec 01, 2015 7:35 am

Re: QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby WiFive » Wed Aug 29, 2018 3:24 pm

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
Posts: 22
Joined: Thu Apr 26, 2018 9:29 am
Location: Italy

Re: QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby wwwenrico » Fri Aug 31, 2018 4:38 am

Dear WiFive,

thank you for your reply.

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

Thanks,
Enrico Migliore

kmakhil90
Posts: 6
Joined: Tue Sep 06, 2016 8:14 am

Re: QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby kmakhil90 » Thu Sep 06, 2018 11:16 am

Hi,

Any update on this PSRAM64 support in idf?

ESP_Sprite
Posts: 2007
Joined: Thu Nov 26, 2015 4:08 am

Re: QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby ESP_Sprite » Fri Sep 07, 2018 2:04 am

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
Posts: 31
Joined: Thu Mar 01, 2018 1:26 am

Re: QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby thethinker » Sat Sep 08, 2018 10:06 pm

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
Posts: 2066
Joined: Tue Dec 01, 2015 7:35 am

Re: QUESTION - ESP32-D2WD + External ESP-PSRAM64

Postby WiFive » Sat Sep 08, 2018 10:13 pm

No, sd card uses hs2 pins

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