Ritesh wrote:Now, we want to connect 16 MB external flash into that kit. So do you have pin configuration idea to connect external SPI Flash Memory along with 4 MB Flash memory.? How it can be accessed it? Can it be accessed like total 20 MB Flash memory or in different way?
I don't think it can be easily done, not without modifying the esp-idf flash driver.
Of course, you can connect the external flash to the spi interface, write your own low level driver and use it as spiffs file system.
You could also replace the 4MB flash chip with the 16MB one (1.8V type), it is not easy, but it can be done.
Or, you could probably order ESP32-WROVER with 16MB Flash.
I think AnalogLamb is also preparing the module with psRAM & 16MB Flash.