How to configure and use SysTick Timer Interrupt in PSoC5?

ShVy_264716 · ‎Jul 17, 2021

Hi All.

I want to configure a SysTick Timer in such a way that the SysTick Timer Interrupt should invoke every 1 ms. I am using

CY8CKIT-059 PSoC® 5LP Prototyping Kit.

In PSoC 4, I did this same functionality by using the following code :

#define NO_OF_TICKS 24000u
int *tick_CM0_ENABLE = (int *) CYREG_CM0_SYST_CSR;
uint32  SysTick_value;
CY_ISR_PROTO(MySysTickHandler);
void SysTick_Timer_Enable(void);     //Enabling SysTick Timer
void SysTick_Timer_Disable(void);    //Disabling SysTick Timer

void SysTick_Timer_Enable(void){
    *tick_CM0_ENABLE |= 1; // For Enabling the Tick Counter
    /* Enable SysTick timer with desired period/number of ticks */
    SysTick_Config(NO_OF_TICKS);
}    

void SysTick_Timer_Disable(void){
    
    *tick_CM0_ENABLE &= (~1); // For Disabling the Tick Counter    
}    
void Initialize(void)
{
    CyGlobalIntEnable;                                              
    CyIntSetSysVector((SysTick_IRQn + 16u), MySysTickHandler);
    SysTick_value = 0;
}
void main(void)
{
    Initialize();
}
CY_ISR(MySysTickHandler)
{
    SysTick_value++;
    if(SysTick_value >= 1000u)
    {
        SysTick_value = 0;
        SysTick_Timer_Disable(); // Stop after 1000 ms
    }    
}

I do not know why but this method does not work for PSoC5.

Len_CONSULTRON · ‎Jul 17, 2021

ShVy,

I haven't verified your code listed in your first post. However, using the SysTick is fairly easy.

Here is working SysTick code I use ALL the time on my PSo5LP projects:

uint32_t systick = 0;
uint32_t systick_prev = 0;
CY_ISR(isr_systick)
{
	systick++;
}
/* Your Application here vvvv */
main(void)
{
...
/* SysTick init */
  CySysTickStart();  /* Start the systick */
  CySysTickSetCallback(0, isr_systick);  /* Add the Systick callback */
      /* to the standard SysTick Int Vector */
/*****/
...   /* other stuff you need to init */
/* SysTick use in the Application */
  for(;;)
  {
/* Wait for the previous SysTick event plus a set delay */
    if(systick >= (systick_prev + 1000)) 
    {    /* SysTick event occurred.  Process SysTick event in the App. */
      systick_prev = systick;    /* Set the new previous SysTick count */
      ...
      /* go do something within the systick event */
      ...
    }
}

Len
"Engineering is an Art. The Art of Compromise."

View solution in original post

How to configure and use SysTick Timer Interrupt in PSoC5?

How to configure and use SysTick Timer Interrupt in PSoC5?

Re: How to configure and use SysTick Timer Interrupt in PSoC5?