RTOS: Sleep mode (Is there aany Way to use SLEEP MODE in STM32F411CEU6)?

[Kai_Satone]

Helllo Frends,

I am workin on FreeRTOS with STM32f411CEU6 Blackpill. 

In this I am facing issue with using sleep mode because there is no pin LPTIM1 in the section of TIMERS.
I tryed bothe of them CMSIS_V1 and CMSIS_V2. 

Is there aany Way to use SLEEP MODE

[Andrew Neil]

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@Kai_Satone wrote:

 STM32f411CEU6 ... there is no pin LPTIM1 in the section of TIMERS.

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That chip doesn't have an LPTIM1 timer:

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@Kai_Satone wrote:

 Blackpill. 

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Beware that many of the "pill" boards have fake STM32s

[Kai_Satone]

Im hopin that there is any other way to usee sleep mode in RTOS

[Andrew Neil · Accepted solution]

Use one of the timers which is available!

RTC might be an option?

The FreeRTOS documentation should cover this...

[Sarra.S]

Hello @Kai_Satonen 

To reach stop modes you can use LPTIM or RTC clocked by LSE... typically, the RTC has a resolution of 1 sec, which is inappropriate for most cases. it is mostly used in deeper sleep modes and not in sleep mode.  

I would as well suggest upgrading to another STM32 as @Andrew Neil said the blackpills are mostly fake!

There are quite range of affordable Nucleo boards with LPTIM, for instance you can choose a NucleoL0 or L4 

[Andrew Neil]

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@Sarra.S wrote:

typically, the RTC has a resolution of 1 sec, which is inappropriate for most cases.

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The "sub-seconds" might be usable ...

[Andrew Neil]

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@Andrew Neil wrote:

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@Kai_Satone wrote:

 STM32f411CEU6 ... there is no pin LPTIM1 in the section of TIMERS.

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That chip doesn't have an LPTIM1 timer:

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Chips which do have LPTIM:

So an L4 would be the closest to  what you have ...

[Andrew Neil]

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@Kai_Satone wrote:

 FreeRTOS with STM32f411

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https://www.google.com/search?q=freertos+with+stm32f411+sleep+mode