Hard Fault Handler

TEMCEFF — Mon, 27 Apr 2020 14:02:15 GMT

I just disable the systic interrupt in systic handler. code is given below:

void SysTick_Handler(void)
{
NVIC_DisableIRQ(SysTick_IRQn);

}

after executing the above instruction processor goes to hard fault handler.

But like the same thing I have done it for timer interrupt as given below.

void TIMER0_IRQHandler()
{
NVIC_DisableIRQ(TIMER0_IRQn);

}

it didn't go to hard fault handler.

What is the reason for this? is anyone experienced this type of issue.

Regards,

Muralidhar.

Re: Hard Fault Handler

Omar_Anguiano — Tue, 28 Apr 2020 17:58:54 GMT

Hello Avinash G

Most of the NVIC_IRQ functions only support Interruptions. The Systick is a system exception, so the Systick is not allowed in the function NVIC_DisableIRQ(SysTick_IRQn).

In order to disable the exception, you need to set the TICKINT bit in the SYST_CSR register to 0.

if you want to disable all IRQ and system exception (apart from NMI and hardfault), you can use "__disable_irq()" and reenable all IRQ and system exception using "__enable_irq()"

Let me know if this is helpful, if you have more questions do not hesitate to ask me.

Best regards,

Omar

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