About kein

kein · 2024-11-13

Hello everyone,I'm working on a project using STM32U031, and using RTC with LSI(32kHz) to calculate elapsed time, and everything working fine, the waveform of LSI output also looks great.And I need to switching power supply in sometimes, and there co...

kein · 2024-10-01

Hello everyone,I'm using Board NUCLEO-U031R8 for testing now, and I started with cubeMX and initial component below:System Clock configure to HSI (16MHz)FreeRTOS with USE_TICKLESS_IDLE as 1 (built in functionality enabled), and auto generated two fun...

kein · 2024-09-15

Hello everyone:I'm working with board NUCLEO-U031R8, and need to wake up when LPUART receive data which using LSE with 32768Hz.MCU would send back the receive data which end with '\n', and it works fine in running mode, and a special command 'S' let ...

kein · 2024-09-12

Hello everyone,I'm using Board NUCLEO-U031R8 for testing now.I have an old FreeRTOS project designed for a power-saving application, and I am preparing to migrate it to a new IC STM32U031 series MCU.In the old project, setting configUSE_TICKLESS_IDLE...

kein · 2024-08-09

Hi everyone,I am working on a power-saving application using the STM32G030 series IC, and I need to configure the UART to work at a baud rate of 9600 with an external low-frequency oscillator (32.768 kHz).My goal is to ensure that the UART baud rate ...

kein · 2024-10-28

I found the problem, here is the situation:// FreeRTOSConfig.h #define configPRE_SLEEP_PROCESSING(__x__) \ do { \ PreSle...

kein · 2024-10-28

Reply to myself with final solution:using RTC to replace LPTIM because LPTIM take too long time 2~3ms to set CCR1 wait CMP1OK, in my case if other peripherals need interrupt like uart receive at same time would occur overrun and lost received data.Th...

kein · 2024-10-09

Hi Sarra:Now I'm using RTC to repleace LPTIM, but there's a little problem, when i start wakeUp timer of RTC and reset RTC time to 00:00:00, it would occur HardFault_Handler() when i call LL_RTC_EnableWriteProtection().And here is the RTC code which ...

kein · 2024-10-04

i think i found the problem, the time to set CCR1 and wait CMP1OK of LPTIM is too long (2~3ms), it makes in the waiting time not trigger the interrupt until whole function finish, just like this:my next step is to found out if there is any peripheral...

kein · 2024-09-20

I found another solution is using HSI instead LSE, it makes everything goes fine, and current consumption is even lower than using an active LSE. So I decided to use HSI as the clock source for LPUART for now.And I would like to clarify a few questio...

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LSI frequency not stable when switching power

LPUART interrupt occur not immediately cause overrun with FreeRTOS tickless.

LPUART receive data broken in STOP mode with LSE

How to implement low-power support with tickless mode in FreeRTOS

How to calculate baud rate error with an external low-frequency oscillator

Re: How to implement low-power support with tickless mode in FreeRTOS

Re: LPUART interrupt occur not immediately cause overrun with FreeRTOS tickless.

Re: LPUART interrupt occur not immediately cause overrun with FreeRTOS tickless.

Re: LPUART interrupt occur not immediately cause overrun with FreeRTOS tickless.

Re: LPUART receive data broken in STOP mode with LSE