Hi,
I'm using Sysconfig to setup for a GPIO interrupt. I'm seeing latency in the microseconds. I need sub-microsecond instructions to set the state of a different pin. Do I need to bypass HwiPMSP432E4_nortos.c?
Regards,
-Mike
Hi Mike,
Not sure if you had a chance to try out the zero-latency interrupt. Below is what I tried on a TM4C123 device.
In the .cfg file for this example, I change the interrupt priority to 0.
For the ISR ledToggle, I add the keyword interrupt.
//---------------------------------------------------------------------------
// ledToggle()
//
// toggles LED on Tiva-C LaunchPad
//---------------------------------------------------------------------------
void interrupt ledToggle(void)
{
TimerIntClear(TIMER2_BASE, TIMER_TIMA_TIMEOUT); // must clear timer flag FROM timer
// LED values - 2=RED, 4=BLUE, 8=GREEN
if(GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_2))
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, 0);
}
else
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 4);
}
i16ToggleCount += 1; // keep track of #toggles
Log_info1("LED TOGGLED [%u] TIMES",i16ToggleCount); // send toggle count to UIA
}
