ESP32 Bluetooth use SPIRAM.

[zhang-wenchao]

@sylvioalves

Is it possible? Is there any plan at present, like WIFI?

CONFIG_ESP32_WIFI_NET_ALLOC_SPIRAM=y
CONFIG_ESP_WIFI_HEAP_SPIRAM=y

[sylvioalves]

@zhang-wenchao It might be possible but there is no plan to do so, even in esp-idf. We might support running BLE stuff from Flash though, which will decrease DRAM/IRAM usage. If you don't mind me asking, what is the main limitation you have in there?

[zhang-wenchao]

#93004

I am currently mainly using ESP32C3, which cannot turn on BT and WIFI at the same time, which forced me to switch to the more expensive ESP32S3. Then I found that the situation was not improved and there was still very little remaining DRAM.

When compiling, dram0 overflow will appear. I found that WIFI can use PSRAM, which saves me 80K. If Bluetooth can use PSRAM, it can let me do more.

[sylvioalves]

Check this clean up: #92795
It frees some dram/iram as well. That might help you.

[zhang-wenchao]

Very good, thanks. Now you can use WiFi and BT at the same time.

This modification saved me 85KB of DRAM of ESP32C3.