Software interrupts

algernonarbuthn — Sun, 30 Jul 2017 13:22:52 GMT

Using the MCUXpresso SDK with i.MX6UL, I need to implement software interrupt handlers.

i.MX6UL implements the ARM GIC. My attempt at using Software0_IRQn is:

Install handler for Software interrupt 0:

SystemInstallIrqHandler( Software0_IRQn, <handler>, 0 );
GIC_SetPriority( Software0_IRQn, <priority>);
GIC_EnableIRQ( Software0_IRQn );

Invoke handler by calling this function:

static void GIC_software_interrupt( IRQn_Type IRQn )
{
GIC_Type *gic = ( GIC_Type* )( __get_CBAR() & 0xFFFF0000UL );

// Invoke IRQn on this processor.

gic->D_SGIR = ( 2 << 24 ) | ( uint32_t )IRQn;

}

This doesn't work. The handler is never called. Anyone know what I'm doing wrong?

Re: Software interrupts

algernonarbuthn — Mon, 31 Jul 2017 01:16:17 GMT

Actually, this does work. I had an interrupt priority issue.