SYSTICK_HANDLER DEFINITION

Question

Good morning 
 
 I would use the SysTick to generate an interrupt every 1ms, to toggle a pin. If I have understood well I could use the following line of code to configure the systick SysTick_Config(SystemCoreClock / 1000); Is it correct? Besides in a startup.c file ( under the ra folder) the SysTick_Handler() is week reference to the default handler :- 
 
 #define WEAK_REF_ATTRIBUTE __attribute__((weak, alias("Default_Handler"))) 
 void SysTick_Handler(void) WEAK_REF_ATTRIBUTE; How and where in my application can I redefine the SysTick_Handler function? Thabnks in advance

IK_Renesas · Accepted Answer

Hello, 
 
 Thanks for reaching out Renesas Engineering Community! 
 
 In order to use SysTick to toggle a pin every x ms for example you should, provide in your code your own version of the SysTick handler to override the default weakly referenced default version. 
 
 You can use as mentioned the CMSIS SysTick_Config() API to set the SysTick timer period and enable the SysTick timer. 
 
 The ARM CMSIS Core Software is documented here: 
 https://arm-software.github.io/CMSIS_5/Core/html/group__SysTick__gr.html 
 
 By doing an FSP search for "SysTick_Config" gives: 
 
 By using #include "hal_data.h" will include the correct CMSIS core_XXX.h header file for the device being used in the project. 
 You would have to provide your own version of the SysTick interrupt handler. 
 To override the default weakly referenced version in startup.c file.

I will attach for you an example for RA4M2 which is blinking a led on EK-RA4M2 every 500 ms by configuring SysTick. This example could be used as a reference for each RA MCU. the process is the same. 
 As you can see here the output on the led is toggling every 500 ms.

5633.RA4M2SysTick.zip 
 The example is ported in FSP version 5.0.0. 
 
 Hope it helps. 
 Regards, 
 IK

IK_Renesas · Answer

We are glad that we helped you! We would appreciate it, if you could please verify the answer you received, since this will also help in the search process and other people in the Forum Community who face similar issues with you. 
 
 Thank you! 
 Regards, 
 IK

DAV_94 · Answer

Thank you. It was helpful

SYSTICK_HANDLER DEFINITION

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