How to design and implement simple interface ?

[jani12]

// Some_Filename.c - This file already exists
/* This function fetches two bytes from Non-Volatile Memory(NVM) and returns to the calling library.
signed short GetDeltaMin ( void ) */
{
signed short param;
NVM_Read ( ( unsigned char * ) &param );
return (signed short) param;
}

// New File - Activate_Deactive_I.c

void Enable_Disable ( Boolean State)
{
/* user will pass 1 or 0 to this function. */
/* If State =1, there is no change to GetDeltaMin ( ). It'll still pass two byte value from NVRAM to calling library. */
/* If State = 0, GetDeltaMin ( ) needs to pass 0 to calling library instead of two byte value from
from NVRAM. */
/* Please write this function and modify GetDeltaMin ( ). */
}

// New File - Activate_Deactivate.h

extern void Enable_Disable ( Boolean State); /* This header file must be included in file from where Enable_Disable ( ) will be called. */
/* I don't think Activate_Deactive_I.c needs to include this header file ? */

 

[jani12]

// Some_Filename.c - This file already exists
/* This function fetches two bytes from Non-Volatile Memory(NVM) and returns to the calling library.
signed short GetDeltaMin ( void ) */
{
signed short param;
NVM_Read ( ( unsigned char * ) &param );
return (signed short) param;
}

// New File - Activate_Deactive_I.c

void Enable_Disable ( Boolean State)
{
/* user will pass 1 or 0 to this function. */
/* If State =1, there is no change to GetDeltaMin ( ). It'll still pass two byte value from NVRAM to calling library. */
/* If State = 0, GetDeltaMin ( ) needs to pass 0 to calling library instead of two byte value from
from NVRAM. */
/* Please write this function and modify GetDeltaMin ( ). */
}

// New File - Activate_Deactivate.h

extern void Enable_Disable ( Boolean State); /* This header file must be included in file from where Enable_Disable ( ) will be called. */
/* I don't think Activate_Deactive_I.c needs to include this header file ? */

When Enable_Disable( ) is called, I can assign value of state to a global variable. Then, in GetDeltaMin( ), I can use the value of global variable to decide whether to return value from NVM or 0 to the calling library.

I'm asking for a better solution than a global variable.

- - - Updated - - -

When Enable_Disable( ) is called, I can assign value of state to a global variable. Then, in GetDeltaMin( ), I can use the value of global variable to decide whether to return value from NVM or 0 to the calling library.

I'm asking for a better solution than a global variable.