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Measurement of Software Execution Time in Traveo II Family – KBA230552

ChaitanyaV_61
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Measurement of Software Execution Time in Traveo II Family – KBA230552

Author: ShusakuS_56           Version: **

Question:

I want to know the execution time of some software. Is there a method to measure the execution time without using a debugger?

Answer:

You can measure the approximate software execution time using the hardware timer (TCPWM). Here is the code snippet for "Hello World".

Code 1. Original “Hello World”

#include <stdio.h>

int main() {

    printf("Hello World");

    return 0;

}

To measure software execution time, make the following modifications to the “Hello World” code:

1. Add the TCPWM timer start command and the TCPWM timer stop command before and after printf ("Hello World"); to the ”.

Code 2. Adding TCPWM Timer Start and Timer Stop Commands

#include <stdio.h>

int main() {

// Initialize Clock Divider and TCPWM (For more details, please see Technical Reference Manual)

  :

// If you need, please Enter Critical section to avoid any interrupt during measurement.

    uint32_t saveIntrEnabled = Cy_SysLib_EnterCriticalSection();    // Interrupt Disable & Save Current Status

  :

// Timer Stop/Clear/Start (Please use INLINE function to reduce software offset like below)

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1STOP = 0x01;        // Timer Stop Command (If Timer is Starting)

TCPWM0_GRPx_CNTx_COUNTER->unCOUNTER.u32Register = 0UL;                // Timer Counter Clear Command

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1START = 0x01;      // Timer Start Command

    printf("Hello World");

// Timer Stop (Please use INLINE function to reduce software offset like below)

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1STOP = 0x01;        // Timer Stop Command

// Read and Save the counter value

    uint32_t TimerCount = Cy_Tcpwm_Counter_GetCounter(TCPWM0_GRPx_CNTx_COUNTER);

  :

// If you need, restore interrupt status

Cy_SysLib_ExitCriticalSection(saveIntrEnabled);                  // Interrupt Restore Previous Status

    return 0;

}

2. Then, add a command to read the timer value of the corresponding TCPWM. This timer value counts the number of clocks. Therefore, the software execution time can be calculated as:

     [Example] Clock Frequency = 20 MHz, Value of TimerCount = 0xF000 (0d61440)

To make the measurement time more accurate, take the following measures.

  1. Increase clock speed.
  2. Measure the time from starting the counter to stopping it. Then, subtract from the count value. Here is an example:

#include <stdio.h>

int main() {

  :

// Timer Stop/Clear/Start (Please use INLINE function to reduce software offset like below)

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1STOP = 0x01;        // Timer Stop Command (If Timer is Starting)

TCPWM0_GRPx_CNTx_COUNTER->unCOUNTER.u32Register = 0UL;                // Timer Counter Clear Command

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1START = 0x01;      // Timer Start Command

    printf("Hello World");

// Timer Stop (Please use INLINE function to reduce software offset like below)

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1STOP = 0x01;        // Timer Stop Command

// Read and Save the counter value

    uint32_t TimerCount = Cy_Tcpwm_Counter_GetCounter(TCPWM0_GRPx_CNTx_COUNTER);

  :

// Measure the time from starting the counter to stopping

TCPWM0_GRPx_CNTx_COUNTER->unCOUNTER.u32Register = 0UL;                // Timer Counter Clear Command

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1START = 0x01;      // Timer Start Command

TCPWM0_GRPx_CNTx_COUNTER->unTR_CMD.stcField.u1STOP = 0x01;    // Timer Stop Command

    uint32_t SwOffsetCount = Cy_Tcpwm_Counter_GetCounter(TCPWM0_GRPx_CNTx_COUNTER);

    uint32_t TimerCountDuringHelloWorld = TimerCount – SwOffsetCount;

    return 0;

}

Note: This KBA applies to the following series of Traveo II MCUs:

  • CYT2B Series
  • CYT4B Series
  • CYT4D Series

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Last update:
‎Dec 23, 2020 09:06 PM
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