execution time in milliseconds

Hi Mir,

there is an other way: just start your timer/counter, execute code and stop it again. That's it, that's all. I give you an example for the MSP430FRAM, using Timer_B registers.

/* ********* Timer_B Init (can also be done by Grace tool)  *********************** */

TB0EX0 = 0x7;
TB0CTL = CNTL_0 + TBSSEL_1 + ID_3 + MC_2 + TBIE;

/* *********** in your main ***************** */

TB0CTL &= ~(0x0030); //stop counter
TB0R = 0;  //set counter 0
TB0CTL |= MC_2; //start counter

   /* ************  your code to be measured **************** */

{}

TB0CTL &= ~(0x0030); //stop counter

Counter_B0_value = *(unsigned int *)0x03D0; //write counter value to variable

/* ******** end example ********* */

Do the Math: 

time = Counter_B0_value * 1/(frequency) * prescaler

Be sure that you mind ALL prescaler! e.g. ACLK, Timer Input divider, TB0EX0, etc...

Hi,

You can turn on a digital output when your code start and turn it off at the end. The time can be measured with an oscilloscope.

Best regards,
AES

Thanks a lot for your answer but actually and don't have an oscilloscope

Mir Dali said:

actually and don't have an oscilloscope

The problem is: teh MSP doesn't know about time. It only know clock cycles. You can count clock cycles, but you don't know how long a clock cycle is.
YOu ma yuse a quartz crystal and derive the MCU clockcycles from it, then you know how long a clock cycle is and can multiply it with the amount of clock cycles passed.
For counting clock cycles (up to 65535) you can use a timer, as suggested.

For a microcontroller, time really is relative.

Jens-Michael Gross said:

one really shuldn't start developing on a microcontroller without a scope

Absolutely!

It's like taking up carpentry without a saw!

Andy Neil said:

It's like taking up carpentry without a saw!

Well, I like this picture. Fits better than mine with the PC.