undefined reference to GET_GPIO_VALUE

This error message typically indicates that the linker cannot find the definition of the function GET_GPIO_VALUE that is being used in your code.

Possible causes for this error include:

The function is not defined in any of your source or header files. Make sure that you have defined the function and that it is in a file that is being compiled and linked with your program.
The function is defined, but it is not being included in the linking process. Check that the file containing the function is included in your makefile or build script.
The function is defined with a different name or signature than the one you are using in your code. Double-check that the function name and parameter types match what you are using in your code.
The function is defined in a library that is not being linked with your program. Make sure that the library containing the function is included in your linker command line.

To resolve this error, you may need to review your code and build settings to ensure that the function is properly defined and included in the linking process