Weird LPUART interrupt behaviour

[XKeto.1]

Hi,

i write code in bare metal so every time i initialize a project in STM32CubeIDE i do it as an empty project. I made a project for STM32L011K4 and try to initialize the LPUART, in the startup file i can find that the handler for the LPUART1 name is AES_RNG_LPUART1_IRQHandler. I try to write my code for this handler but when i debug the code hang in loopforever at the default handler. Next step i proceed it was to make the same project as STM32Cube and not as empty. The startup file there was different the handler's name is LPUART1_IRQHandler, i copy and paste the code from the startup file of STM32Cube in my empty project, write code for LPUART1_IRQHandler and it worked. So did i miss something or it is a bug?

OS: Arch Linux

IDE: STM32CubeIDE 1.7.0

Steps to reproduce:

1. Create empty project for STM32L011K4
2. Create STM32Cube project for STM32L011K4
3. Startup files (In Startup folder) are different

[TDK]

In order for the appropriate IRQ handler to be called, the function name in your code needs to match the function name given in the vector table (typically in startup_*.s). It doesn't really matter what they're called.

They should probably be the same name here for consistency, but it's weird how creating an "empty project" creates code at all.

[XKeto.1]

Yes i know that and i name my function AES_RNG_LPUART1_IRQHandler because that was the only handler that has LPUART at its name, i enable the AES_RNG_LPUART1_IRQ interrupt and when i run it it just go to default handler, which it mean that an interrupt has occur (LPUART) that cannot find its handler. After creating an CubeIDE project i just copy the code from the startup file(which is older) and change the name to LPUART1_IRQHandler and LPUART1_IRQ respectively and everything run fine. To me it seems like a bug.

Reproduce:

1. Make an empty project for STM32L0x1
2. Make an STM32Cube project for STM32L0x1
3. Compare startup files

[VBobr.1]

Hello.

I have the same situation. The RXNEIE interrupt for LPUART did not work until I replaced the startup_stm32l031f6px.s file with the same one from the STM32Cube project.

Thanks to @XKeto.1 for this workaround.

MCU: STM32L031F6.

IDE: STM32CubeIDE 1.8.0

LPUART_init.c

...

// Enable transmitter, receiver and receive-interrupt of LPUART1

LPUART1->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE | USART_CR1_UE;

...