Get Tick Count From ISR

RE: Get Tick Count From ISR

Susheel Nuguru — Fri, 05 Jun 2020 13:14:57 GMT

It disables the application-specific interrupts without touch the softdevice reserved interrupts

RE: Get Tick Count From ISR

Roei — Thu, 04 Jun 2020 10:17:53 GMT

Thanks!

Can you please explain how portSET_INTERRUPT_MASK_FROM_ISR helps us with critical sections?

RE: Get Tick Count From ISR

Susheel Nuguru — Thu, 04 Jun 2020 10:15:55 GMT

All FromISR based functions that push the context to a queue does not need any critical sections while pushing onto the queue. The rest of the FromISR functions that are synchronous do use critical sections using portSET_INTERRUPT_MASK_FROM_ISR

RE: Get Tick Count From ISR

Roei — Wed, 03 Jun 2020 13:18:41 GMT

I've noticed that FromISR functions don't use critical sections.

Isn't that problematic?

RE: Get Tick Count From ISR

Susheel Nuguru — Wed, 03 Jun 2020 11:57:26 GMT

You should do something like below in your app

if (__get_IPSR() != 0)
{
    xTaskGetTickCountFromISR()
} else 
{
    xTaskGetTickCount();
}

RE: Get Tick Count From ISR

Roei — Wed, 03 Jun 2020 07:07:13 GMT

Sure.

We are talking about event which triggers NFC_T2T_EVENT_FIELD_ON.

After that, my application writes an event, stops current advertising, perform some checks and start new advertising.

One of the checks is that xTaskGetTickCount is under a specific value.

In that case, I think I need to use xTaskGetTickCountFromISR().

RE: Get Tick Count From ISR

Susheel Nuguru — Wed, 03 Jun 2020 06:29:45 GMT

Can you please give me more context of the callstack that calls xTaskGetTickCount inside an interrupt? Is this Nordic SDK code or application specific code?