Need help to start PSRAM support into ESP32 IDF 3.1

[Ritesh]

Hi Espressif SDK Developees,

We are working on ESP32 IDF 3.1 and now we need to add support for PSRAM as per our project requirements.

So, Would you please let me know steps to include with example for that?

[fly135]

make menuconfig
component config
esp32-specific
Enable "support for ext connected spi ram"

[Ritesh]

make menuconfig
component config
esp32-specific
Enable "support for ext connected spi ram"

Yes. But would you please let me know few more details like what I need means which toolchain i need to PSRAM support with examples as well?

[ESP_Angus]

Same toolchain. If the build system gives you no warnings about "unsupported toolchain version", you're good to go.

[Ritesh]

Same toolchain. If the build system gives you no warnings about "unsupported toolchain version", you're good to go.

Thanks for providing updates regarding same. Apart from that toolchain, Do we need to take care any other stuffs while starting to work for PSRAM?

[fly135]

Same toolchain. If the build system gives you no warnings about "unsupported toolchain version", you're good to go.

Thanks for providing updates regarding same. Apart from that toolchain, Do we need to take care any other stuffs while starting to work for PSRAM?

Nope, just enable it. Print the heap size before and after enabling to see that you have the increased ram. The PSRAM appears as storage available on the heap. See the docs on the heap.

https://docs.espressif.com/projects/esp ... alloc.html

[Ritesh]

Same toolchain. If the build system gives you no warnings about "unsupported toolchain version", you're good to go.

Thanks for providing updates regarding same. Apart from that toolchain, Do we need to take care any other stuffs while starting to work for PSRAM?

Nope, just enable it. Print the heap size before and after enabling to see that you have the increased ram. The PSRAM appears as storage available on the heap. See the docs on the heap.

https://docs.espressif.com/projects/esp ... alloc.html

Thanks for providing details for that. So, Heap will be increased with 4 MB after enabling support for that. Correct?

[fly135]

Thanks for providing details for that. So, Heap will be increased with 4 MB after enabling support for that. Correct?

Yes

[Ritesh]

Thanks for providing details for that. So, Heap will be increased with 4 MB after enabling support for that. Correct?

Yes

Thanks a lot for providing support for that.

[Ritesh]

Hi,

There are some conditions mentioned into hardware section to use PARAM like below.

The ESP-PSRAM32 chip is an 1.8V device, and can only be used in parallel with an 1.8V flash part. Make sure to either set the MTDI pin to a high signal level on bootup, or program the fuses in the ESP32 to always use a VDD_SIO level of 1.8V. Not doing this risks damaging the PSRAM and/or flash chip.

So, Would you please let me know what I need to take while using PSRAM along with flash memory?

Do I need to configure anything into EFUSE or any registers for that?