CC2642R: Usage of Hwi_disable()

Mehul Dalal

Part Number: CC2642R

In certain condition, I want to disable global interrupts by calling Hwi_disable() and restore it only when a specific GPIO line changes its state. Is following code correct?

hwiKey = Hwi_disable();

// Only allow interrupt for GPIO line 14

PIN_setInterrupt(gpioPinHandle, (PIN_Config)(IOID_14 | PIN_IRQ_BOTHEDGES);

Whether SYS/BIOS execution stops once Hwi_disable() is called and no other thread can execute?

On GPIO interrupt:

Hwi_restore(hwiKey);

// Restore previous state and allow SYS/BIOS to run

Whether the MCU can go to the standby case when Hwi_disable() is called? Whether TI RTOS Power Manager works in order to go to the standby mode and the MCU gets out of standby mode when GPIO interrupt occurs?

over 6 years ago

0 Mehul Dalal over 6 years ago

Expert 2180 points

Also, I assume that when Hwi_disable() is called, since the SY/BIOS scheduler itself is disabled, all other threads in the system as well cannot execute. Right?

0 Mehul Dalal over 6 years ago in reply to Mehul Dalal

Expert 2180 points

Can someone provide me answers to above?

0 ToddMullanix over 6 years ago in reply to Mehul Dalal

TI__Guru* 96960 points

Hi Mehul,

It's not clear what you are trying to do. Once you disable interrupts, no interrupts will run, so only the active thread runs. You generally only use Hwi_disable/Hwi_restore for short periods where you need mutual exclusion.

Todd

0 Mehul Dalal over 6 years ago in reply to ToddMullanix

Expert 2180 points

I have a use case to implement here that if one of the GPIO is LOW, the code has to disable all interrupts and threads except this GPIO to detect HIGH condition. By doing that, the logic is is save power and allows MCUs to go in sleep.

Once the GPIO HIGH is detected, I want to restore the state of HWI, SWI and threads.

0 ToddMullanix over 6 years ago in reply to Mehul Dalal

TI__Guru* 96960 points

Hi Mehul,

Your approach is not recommended. The power module was designed along with the kernel and drivers to go into the lowest power level when the Idle task runs. You can register the GPIO so that when it is asserted, you'll be take out of low power mode.

Todd

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CC2642R: Usage of Hwi_disable()