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Code Examples

MotooTanaka
Esteemed Contributor

Hi,

こんにちは、

I found a community question asking how to measure time taken for a particular function.

ある関数の実行時間を測定したいという質問を見かけました。

Although there is a very nice KBA, but it is assuming CapSense, may be adding another sample using a gpio (switch) won't harm.

下記の素晴らしい KBA が既にあるのですが、対象が CapSense になっているので、GPIO (スイッチ) 版も有っていいかなと。

Measuring Duration of CapSense Button Press Using SysTickTimer - KBA226863

And also there is a nice stopwatch implementation of /odissey1-san, but I could not find the URL, could you reply one or you master piece here, too? > Odissey1-san

また、/odissey-1 さんの高機能なストップウォッチもあるのですが、URL を見つけられませんでした。 URL か添付ファイルをお願いできますか? > Odissey1-san

At least, I hope that I can reference this later 😉

少なくとも後で自分用に見つけられますし・・・

So, I made samples for CY8CKIT-044 and CY8CKIT-059.

CY8CKIT-044 と CY8CKIT-059 用にサンプルを作成してみました。

=== CY8CKIT-059 ===

schematic

002-schematic.JPG

pins

003-pins.JPG

main.c

==============

#include "project.h"

#include "stdio.h"

#define STR_LEN 64

char str[STR_LEN+1] ;

void print(char *str)

{

    UART_PutString(str) ;

}

void cls(void)

{

    print("\033c") ; /* reset */

    CyDelay(100) ;

    print("\033[2J") ; /* clear screen */

    CyDelay(100) ;

}

void splash(char *title)

{

    cls() ;

    if (title && *title) {

        print(title) ;

        print(" ") ;

    }

    snprintf(str, STR_LEN, "(%s %s)\n\r", __DATE__, __TIME__) ;

    print(str) ;

}

volatile int sw_flag ;

volatile uint32_t tick_count = 0 ;

CY_ISR(sw_isr)

{

    SW1_ClearInterrupt() ;

    sw_flag = 1 ;

}

CY_ISR(tick_callback)

{

    tick_count++ ;

}

int find_empty_slot(void)

{

    int result = -1 ;

    uint32_t i ;

    for (i = 0 ; i < CY_SYS_SYST_NUM_OF_CALLBACKS ; i++ ) {

        if (CySysTickGetCallback(i) == NULL) {

            result = i ;

            break ;

        }

    }

    return(result) ;

}

       

void show_delta_time(void)

{

    static uint32_t prev_tick = 0 ;

    uint32_t new_tick = 0 ;

    uint32_t delta = 0 ;

   

    new_tick = tick_count ;

    delta = new_tick - prev_tick ;

    prev_tick = new_tick ;

    snprintf(str, STR_LEN, "Current: %d -> %d ms passed\n\r", new_tick, delta) ;

    print(str) ;

}

int main(void)

{  

    int sys_tick_slot = 0 ;

   

    CyGlobalIntEnable; /* Enable global interrupts. */

    UART_Start() ;

   

    isr_1_StartEx(sw_isr) ;

    sys_tick_slot = find_empty_slot() ;

    if (sys_tick_slot < 0) {

        print("Sorry No empty SysTick Slot available\n\r") ;

        while(1) { } /* halting here */

    } else {

        CySysTickStart() ;

        CySysTickSetCallback(sys_tick_slot, tick_callback) ;

    }

   

    splash("Timer test with SysTick") ;

    print("Measuring time between SW1 push\n\r") ;

   

    for(;;)

    {

        if (sw_flag) {

            show_delta_time() ;

            sw_flag = 0 ;   

        }

    }

}

==============

Tera Term log

001-teraterm-log.JPG

=== CY8CKIT-044 ===

schematic

011-Schematic.JPG

pins

012-pins.JPG

main.c

=================

#include "project.h"

#include "stdio.h"

#define STR_LEN 64

char str[STR_LEN+1] ;

void print(char *str)

{

    UART_UartPutString(str) ;

}

void cls(void)

{

    print("\033c") ; /* reset */

    CyDelay(100) ;

    print("\033[2J") ; /* clear screen */

    CyDelay(100) ;

}

void splash(char *title)

{

    cls() ;

    if (title && *title) {

        print(title) ;

        print(" ") ;

    }

    snprintf(str, STR_LEN, "(%s %s)\n\r", __DATE__, __TIME__) ;

    print(str) ;

}

volatile int sw_flag ;

volatile uint32_t tick_count = 0 ;

CY_ISR(sw_isr)

{

    SW2_ClearInterrupt() ;

    sw_flag = 1 ;

}

CY_ISR(tick_callback)

{

    tick_count++ ;

}

int find_empty_slot(void)

{

    int result = -1 ;

    uint32_t i ;

    for (i = 0 ; i < CY_SYS_SYST_NUM_OF_CALLBACKS ; i++ ) {

        if (CySysTickGetCallback(i) == NULL) {

            result = i ;

            break ;

        }

    }

    return(result) ;

}

       

void show_delta_time(void)

{

    static uint32_t prev_tick = 0 ;

    uint32_t new_tick = 0 ;

    uint32_t delta = 0 ;

   

    new_tick = tick_count ;

    delta = new_tick - prev_tick ;

    prev_tick = new_tick ;

    snprintf(str, STR_LEN, "Current: %d -> %d ms passed\n\r", new_tick, delta) ;

    print(str) ;

}

int main(void)

{  

    int sys_tick_slot = 0 ;

   

    CyGlobalIntEnable; /* Enable global interrupts. */

    UART_Start() ;

   

    isr_1_StartEx(sw_isr) ;

    sys_tick_slot = find_empty_slot() ;

    if (sys_tick_slot < 0) {

        print("Sorry No empty SysTick Slot available\n\r") ;

        while(1) { } /* halting here */

    } else {

        CySysTickStart() ;

        CySysTickSetCallback(sys_tick_slot, tick_callback) ;

    }

   

    splash("Timer test with SysTick") ;

    print("Measuring time between SW1 push\n\r") ;

   

    for(;;)

    {

        if (sw_flag) {

            show_delta_time() ;

            sw_flag = 0 ;   

        }

    }

}

=================

Tera Term log

010-TeraTerm-log.JPG

moto

1 Reply
TakashiM_61
Moderator
Moderator

Dear Moto-san,

We appreciate your contribution for this.

Best regards.