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STM32L073RZ unable to enter sleep mode with STM32CubeIDE, but works in Keil.

kevin192291
Associate II

‎2025-07-25 1:40 AM - last edited on ‎2025-07-25 1:47 AM by

Hello All,
I am very worried about this as time is short.
I am attempting to get my STM32L073RZ into low power mode using STM32CubeIDE version 19, and it wakes as soon as it sleeps. I am wondering if this is a problem with my code, or possibly an issue with the STM32CubeIDE?

I am attempting sleep mode like so:

void Enter_Stop_Mode(void)
{
	ConsolePrintf("Preparing to enter Stop mode\r\n");

    // Clear Wake-Up flag
    __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);
    ConsolePrintf("RTC Wake-Up flag cleared\r\n");

    // Enter Stop mode (low-power mode)
    ConsolePrintf("Entering Stop mode\r\n");
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
    ConsolePrintf("Exited Stop mode\r\n");
}

 

And this fails. Am I the only one experiancing this, how have others got this working?
Are there any examples I could go off of?

For more context, here is my repo: https://github.com/CropWatchDevelopment/tempSensorx2
If anyone could help, I would be very greatful.
-Kevin

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3 REPLIES 3
Andrew Neil
Super User

‎2025-07-25 1:48 AM

@kevin192291 wrote:

 it wakes as soon as it sleeps.

How do you determine that?

Do you have 'Debug in low power modes' enabled in CubeIDE, but not Keil?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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kevin192291
Associate II
In response to Andrew Neil

‎2025-07-25 2:00 AM

so, when waking from sleep, it initializes my usart1, then sends data over the serial line to my pc.
Then, I disable to usart, and all other periferals, and wait for my RTC to wake it up again. Sadly it wakes up immediately, I know because I get the instant response on the computer.

I have tried re-configuring the lpuart to a normal usart as it shouldn't wake my board, and I should be safe from any data coming back to wake the mcu up, but that also doesn't prevent the instant wake.

I am sure I am missing something, but the real problem is, where.... Any ideas where I am going wrong?

kevin192291
Associate II
In response to Andrew Neil

‎2025-07-25 2:01 AM

Quick followup!
I posted code & repo, here is my log ed output from the USART to my computer:

[2000-01-01 00:05:41] Going to sleep...
[2000-01-01 00:05:41] USART1 (DBG) Cnfigured
[2000-01-01 00:05:41] UART reinitialized
[2000-01-01 00:05:41] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:41] RTC Wake-Up Timer disabled
[2000-01-01 00:05:41] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:41] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:42] USART1 (DBG) Cnfigured
[2000-01-01 00:05:42] UART reinitialized
[2000-01-01 00:05:42] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:42] RTC Wake-Up Timer disabled
[2000-01-01 00:05:42] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:42] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:42] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:42] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:43] USART1 (DBG) Cnfigured
[2000-01-01 00:05:43] UART reinitialized
[2000-01-01 00:05:43] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:43] RTC Wake-Up Timer disabled
[2000-01-01 00:05:43] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:43] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:43] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:43] Going to sleep...
[2000-01-01 00:05:44] USART1 (DBG) Cnfigured
[2000-01-01 00:05:44] UART reinitialized
[2000-01-01 00:05:44] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:44] RTC Wake-Up Timer disabled
[2000-01-01 00:05:44] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:44] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:44] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:44] Going to sleep...
[2000-01-01 00:05:44] USART1 (DBG) Cnfigured
[2000-01-01 00:05:44] UART reinitialized
[2000-01-01 00:05:44] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:44] RTC Wake-Up Timer disabled
[2000-01-01 00:05:44] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:44] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:44] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:44] Going to sleep...
[2000-01-01 00:05:44] USART1 (DBG) Cnfigured
[2000-01-01 00:05:44] UART reinitialized
[2000-01-01 00:05:44] Starting RTC Wake-Up Timer configuration
[2000-01-01 00:05:44] RTC Wake-Up Timer disabled
[2000-01-01 00:05:44] RTC Wake-Up Timer Initialized for ~60 seconds
[2000-01-01 00:05:44] RTC Wake-Up interrupt enabled in NVIC
[2000-01-01 00:05:44] RTC Wake-Up Timer reinitialized
[2000-01-01 00:05:44] Going to sleep...
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