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Use a logic analyzer and flip a port. If it is a lengthy program part use a timer/counter component as a clock and read the values at begin and end.
creative, You can yse SysTick counter to measure amount of CPU cycles taken by a function or operation as shown below. You will be limited by 2^24 CPU ticks only (about 0.25sec @24MHz CPU speed), as SysTick counter on Cortex M0 and M3 can not go beyond SYSTICK_MAXVAL. odissey1 #define SYSTICK_MAXVAL 0x00FFFFFF //max allowed SysTick counter value for 24bit uint32 SysCntVal; // The value of SysTick counter you are trying to retrieve SysTick_Config(SYSTICK_MAXVAL); //reset counter set to max value, 1-time, will not reload TCPWM_WritePeriod(); // your function is here... SysCntVal = SYSTICK_MAXVAL - (SysTick->VAL); //get elapsed ticks (min offset 3 ticks) sprintf(strMsg1, "%d, %f\r\n", SysCntVal, x); //report result UART_PutString(strMsg1);