STM32F030R8-Nucleo I2C_TwoBoards_ComPolling example - COUNTOF macro

[Franksterb92]

im looking in the main.h file for this example and wondering where __BUFFER__ is defined thats used in this line 

#define COUNTOF(__BUFFER__) (sizeof(__BUFFER__) / sizeof(*(__BUFFER__)))

thanks for the help

[Andrew Neil · Accepted solution]

It's just the parameter of the COUNTOF() macro

When you "call" the macro, you replace it with the name of  whatever actual buffer you want; eg,

uint8_t my_buffer[123];
size_t  buffer_length;

buffer_length = COUNTOF( my_buffer );

This is just standard C syntax - nothing specific to STM32.

[Franksterb92]

oh ok that's kind of what i was thinking wen i used it in a different program and it didn't throw any errors