LPC55S69: precondition for PowerDown API

[EugeneHiihtaja]

Hello !

I try to add PowerDown mode to tickless implementation of RTOS in SDK and all calculation located in this macro:

configPOST_SLEEP_PROCESSING(xExpectedIdleTime);

Enter_PowerDown() is called there. Looks like it enter to PowerDown mode but it is not possible to wakeup it back by any source.

But freertos handler disable all interrupts and enable those back after.

__disable_irq();

...

POWER_EnterPowerDown(
(kPDRUNCFG_PD_LDOMEM | kPDRUNCFG_PD_FRO32K),
0x7FFF,
WAKEUP_GPIO_GLOBALINT0 | WAKEUP_GPIO_GLOBALINT1 |
WAKEUP_RTC_LITE_ALARM_WAKEUP
| WAKEUP_FLEXCOMM3 | WAKEUP_OS_EVENT_TIMER,
1);

....

_enable_irg()

Can wakeup works with disabled interrupts ?

What are other preconditions ?

Regards,

Eugene

[soledad]

Hi,

Please check the following document:

Tickless Low power features in FreeRTOS 

I hope this helps, have a great day,
Sol

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[EugeneHiihtaja]

Hi soledad‌ !

I know how ticklessrtos working, but problem with Power management library . It is a library and no clear why it is not possible to wakeup from PowerDown mode when TZ is enabled. Looks like it should have access to all peripherals what is need but no way to check what exactly it is doing.

So what exact library variant and what precondition need for library ?

Regards,

Eugene

[soledad]

If you use the Power Down Library you should be able to return from an Interrupt but if you secure the complete memory you are blocking the MCU to access the registers and the Interrupts never  goes on.

Remove the TZ after sending the MCU into Power Donw and once you clear the power mode, then you should send back to secure mode. this way you are in a way to wakeup.

Happy Holidays!