MSP432E401Y: Issue a software interrupt with TI-RTOS API

Philip Baltz1

Part Number: MSP432E401Y
Other Parts Discussed in Thread: SYSBIOS

I would like to know how to trigger an ARM software interrupt using the TI-RTOS API. I am using a GPIO driven by a periodic signal to trigger a callback function. For testing I would prefer not to have to go through the process of generating the GPIO signal externally, but instead create a simple software loop which triggers the software interrupt.

I have found the driver function IntTrigger() which takes as its argument the number of the GPIO interrupt in the NVIC interrupt table. Using this I can generate the software interrupt when I configure the GPIO interrupt using the driverlib API (GPIOP#_IRQHandler(), IntEnable(), ..)

However the IntTrigger() function does not work if I configure the GPIO interrupt using the TI-RTOS API (GPIO_setConfig(), GPIO_setCallback(), GPIO_enableInt(), ...). I would like to use the TI-RTOS API for consistency with the rest of my application code. What is the TI-RTOS API method for triggering a GPIO interrupt via software?

-phil

over 5 years ago

0 Leonardo Estevez over 5 years ago

TI__Genius 12615 points

Hi Phil,

If you're wanting to do this for testing, another method might be to connect a wire from an output GPIO to your input GPIO and trigger your interrupt over that wire. Let me know if this isn't a viable way of testing.

BR,
Leo

0 Philip Baltz1 over 5 years ago in reply to Leonardo Estevez

Intellectual 820 points

Leo,

That is another method to trigger an interrupt, but unfortunately does not answer my question.

Regards,

-phil

0 Leonardo Estevez over 5 years ago in reply to Philip Baltz1

TI__Genius 12615 points

Hi Phil,

Documentation on how software interrupts work in TI RTOS can be found in the TI resource explorer:

https://dev.ti.com/tirex

You can find the documentation you are looking for under:

TI RTOS Kernel APIs in the Simplelink MSP432E4 SDK folder

https://dev.ti.com/tirex/explore/node?node=AJezjyepNCX1HVQNhBscig__J4.hfJy__LATEST

from there you can navigate to ti -> sysbios -> knl -> Swi for the documentation on software interrupt APIs.

BR,
Leo

0 Philip Baltz1 over 5 years ago in reply to Leonardo Estevez

Intellectual 820 points

Leo,

Please correct me if I'm wrong, but I believe the TI RTOS software interrupt API only work within the context of the RTOS tasks, i.e. it is a software-only solution and does not use the CPU's interrupt hardware. I'm looking for a RTOS API which uses the ARM Software Trigger Interrupt facilitated by the SWTRIG register in the ARM NVIC, as the driver IntEnable() function does. I appologize for not being clear in my request, it's unfortunate that TI means one thing by software interrupt and ARM another by the similarly named software trigger interrtupt.

-phil

0 Leonardo Estevez over 5 years ago in reply to Philip Baltz1

TI__Genius 12615 points

Hi Phil,

If you're wanting to post a hardware interrupt for test purposes, you should be able to use HWI_post. This is documented in the hal -> HWI directory.

BR,
Leo

0 Philip Baltz1 over 5 years ago in reply to Leonardo Estevez

Intellectual 820 points

Thanks Leo I'll check the HWI API out.

-phil

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MSP432E401Y: Issue a software interrupt with TI-RTOS API