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Hi, I was testing your library on the NRF52840 Feather and I got one compilation error:

D:\Documents\Arduino\libraries\SPIMemory\src/SPIMemory.h:114:12: fatal error: util/delay.h: No such file or directory
   #include <util/delay.h>
            ^~~~~~~~~~~~~~
compilation terminated.

This is the code that is giving that error:

#ifndef ARCH_STM32
  #if defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_STM32L0) || defined(__STM32F1__) || defined(STM32F1) || defined(STM32F3) || defined(STM32F4) || defined(STM32F0xx)
    #define ARCH_STM32
  #endif
#endif
#if defined (ARDUINO_ARCH_SAM) || defined (ARDUINO_ARCH_SAMD) || defined (ARDUINO_ARCH_ESP8266) || defined (SIMBLEE) || defined (ARDUINO_ARCH_ESP32) || defined (BOARD_RTL8195A) || defined(ARCH_STM32) || defined(ESP32) || defined(NRF52)
// RTL8195A included - @boseji <[email protected]> 02.03.17
  #define _delay_us(us) delayMicroseconds(us)
#else
  #include <util/delay.h>
#endif

This is because the NRF52 Core for new chips it doesn't have that NRF52 macro defined, instead it has now the macro NRF52_SERIES so basically by adding || defined(NRF52_SERIES) it will compile for all new devices.

Hope this helps anyone getting this error.

DO NOT DELETE OR EDIT anything below this

_{Note 1: Make sure to add all the information needed to understand the bug so that someone can help. If any essential information is missing we'll add the 'Needs more information' label and close the issue until there is enough information.}

_{Note 2: For support questions (for example, tutorials on how to use the library), please use the Arduino Forums. This repository's issues are reserved for feature requests and bug reports.}