profiler.h

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#ifndef PROFILER_H
#define PROFILER_H
 
#include "main.h" // Or wherever DWT and CoreDebug are defined
 
// --- Configuration ---
// Comment this line out to disable all profiling code from the build
#define ENABLE_PROFILING
 
// --- DWT Initialization (from your previous example) ---
#ifdef ENABLE_PROFILING
void initDWT(void){
    CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk; // Enable trace
    DWT->CYCCNT = 0; // Reset the counter
    DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk; // Enable cycle counter
}
#else
// If profiling is disabled, the init function does nothing.
#define initDWT()
#endif
 
 
// --- Profiling Macros ---
#ifdef ENABLE_PROFILING
 
    // A structure to hold profiling results
    typedef struct {
        uint32_t start_time;        
        uint32_t elapsed_cycles;    
        float    elapsed_ns;        
        float    elapsed_us;        
        float    elapsed_ms;        
    } ProfileResult;
 
    // Starts the profiler. Pass a ProfileResult variable by address.
    #define PROFILER_START(p_result) (p_result)->start_time = DWT->CYCCNT
 
    // Stops the profiler, calculates elapsed time, and stores it.
    #define PROFILER_STOP(p_result) \
        do { \
            (p_result)->elapsed_cycles = DWT->CYCCNT - (p_result)->start_time; \
            float clock_period_ns = 1000000000.0f / SystemCoreClock; \
            (p_result)->elapsed_ns = (float)(p_result)->elapsed_cycles * clock_period_ns; \
            (p_result)->elapsed_us = (p_result)->elapsed_ns / 1000.0f; \
            (p_result)->elapsed_ms = (p_result)->elapsed_us / 1000.0f; \
        } while(0)
 
#else
    // If profiling is disabled, all macros compile to nothing.
    // We still need a dummy struct to prevent "undeclared" errors.
    typedef struct { uint32_t dummy; } ProfileResult;
    #define PROFILER_START(p_result)
    #define PROFILER_STOP(p_result)
 
#endif // ENABLE_PROFILING
 
#endif // PROFILER_H