ESP32 Forum

Hi,
I am currently working in the ESP32 WROOM-32U development kit. I need to write and read the data on an external flash chip using the SPI interface. I took the sample code from esp-idf storage example code -> "ext_flash_fatfs". I flashed the code directly on the esp32 board and observed the below error response,

I (328) spi_flash: detected chip: generic
I (331) spi_flash: flash io: dio
W (335) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (349) app_start: Starting scheduler on CPU0
I (353) app_start: Starting scheduler on CPU1
I (353) main_task: Started on CPU0
I (363) main_task: Calling app_main()
I (363) example: Initializing external SPI Flash
I (363) example: Pin assignments:
I (373) example: MOSI: 23 MISO: 19 SCLK: 18 CS: 5
I (373) example: DMA CHANNEL: 3
E (383) memspi: no response

E (383) example: Failed to initialize external Flash: ESP_ERR_INVALID_RESPONSE (0x108)
I (393) main_task: Returned from app_main()

Need support to overcome this issue.

So, 'external' SPI flash in this context means a SPI flash chip other than the main flash that contains the program itself. Is that what you intended? If so, did you actually hook up an external flash chip?

In ESP32 WROOM-32U development kit, i thought the external flash chip is already mounted within the kit. Correct me if am wrong.

That would be the main flash; you can look at the examples/storage/spiffs example to store data there.

I got it, Thanks for your reply.