RTOS/CC2650: How to use functions or macros in the sensor controller?

Tool/software: TI-RTOS

Hello,

My code below crashes sensor controller studio. It only happens when I try to use a macro. Am I using macros correctly? Also I tried using a function but that not seem to work and the documentation was not really clear on how to use them.

Video of application crashing:

https://streamable.com/4a3yn

My code:

macro write_to_buffer(data, size) {
    
    //    U16 data = 5;
    //    U16 size = 4;
    
    // variable declarations
    U16 element;
    U16 shift_by;
    
    // let's us know how much space we have left in current row
    U16 space_left = ARRAYSIZE - state.bitpt;
    
    // special variable to access array
    U16 n = state.elempt;
    
    if (size <= space_left) {
        
        // enough for one array
        
        shift_by = space_left - size;
        element = output.BUFFER[n];
        element = element | (data << shift_by);
        output.BUFFER[n] = element;
        state.bitpt += size;
        
        if (state.bitpt == ARRAYSIZE) {
            state.bitpt = 0;
            n += 1;
            if (n == BUF_ARR_LEN) {
                n = 0;
                // we are looping over in the ring buffer
            }
        }
        
    } else {
        
        // have to split into two arrays
        
        shift_by = size - space_left;
        element = output.BUFFER[n];
        element = element | (data >> shift_by);
        output.BUFFER[n] = element;
        
        n += 1;
        
        if (n == BUF_ARR_LEN) {
            n = 0;
            // we are looping over in the ring buffer
        }
        
        shift_by = (ARRAYSIZE - size) - space_left;
        element = output.BUFFER[n];
        element = element | (data << shift_by);
        output.BUFFER[n] = element;
        state.bitpt = size - space_left;
        
    }
    
    state.elempt = n;
    
}



write_to_buffer(15, 4);