No power_usi_disable() on Arduino Uno

Question

we have an error after compiling the code in arduinouno that is displayed as
error: 'power_usi_disable' was not declared in this scope in Board: "Arduino/Genuino Uno".how to rectify this error. please reply us fast

Answer 1

The Arduino Uno does not have a USI peripheral. Thus, you cannot disable the power of the (non-existent) USI, and there is no power_usi_disable() function.

Solution: remove the call to power_usi_disable() from your code.

Update: To answer your new question in the comment, WDTCR is the Watchdog Timer Control Register on some AVR chips. On the Uno it is called WDTCSR, because it is a control and status register.

Looks to me like you have downloaded from somewhere a program you do not understand. That program was written for an ATtiny chip and you are trying to compile it as-is for an Arduino Uno, which is based on an (incompatible) ATmega328P. That's not the way to do it: you have to understand the program and rewrite all the ATtiny specific stuff to fit the Uno.