ESP8266 Community Forum

- Fri Apr 17, 2015 9:50 am #14825

Code: Select all// we need to include these to be able to use the spi_flash_get_id() function
extern "C" {
#include "c_types.h"
#include "ets_sys.h"
#include "os_type.h"
#include "osapi.h"
#include "spi_flash.h"
}

size_t fs_size() { // returns the flash chip's size, in BYTES
  uint32_t id = spi_flash_get_id(); 
  uint8_t mfgr_id = id & 0xff;
  uint8_t type_id = (id >> 8) & 0xff; // not relevant for size calculation
  uint8_t size_id = (id >> 16) & 0xff; // lucky for us, WinBond ID's their chips as a form that lets us calculate the size
  if(mfgr_id != 0xEF) // 0xEF is WinBond; that's all we care about (for now)
    return 0;
  return 1 << size_id;
}


On my ESP-12, this returns 4194304 bytes, which is 4 megabytes.

- Sat Jun 27, 2015 3:35 am #21852 EspressIf flash download tool v1.2 shows the installed flash size. I guess it uses the same logic as yours. Connect the board to USB, set to flash mode and the program detects the chip, flash size and clock speed.

- Thu Sep 24, 2015 4:58 pm #29815 In a NodeMCU unit, if you have a terminal session running you can manually get the flash size with the following:

> majorVer, minorVer, devVer, chipid, flashid, flashsize, flashmode, flashspeed = node.info();
> print(flashsize)
4096 -- This is what my Adafruit Huzzah running NodeMCU 0.9.5 returned

- Mon Oct 19, 2015 7:31 pm #31787 Using esptool to read the flash_id information, I find that my NodeMCU dev kit returns:

Manufacturer: e0
Device: 4016

I am not sure how to interpret this. I am thinking that based on the manufacturer, the device code can then be looked up ... but where would one find a list of codes for decoding purposes?

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