Enabling UART Idle line interrupt causes program to hang

[Ash G]

I'm using STM32L062K08 MCU with HAL library. I found out setting idle line interrupt causes program to hang. It worked when I used for UART2.

__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE);  // enable idle line interrupt

What could be the possible reason for this issue?

[Tesla DeLorean]

Probably some pending status isn't getting properly cleared and it is re-entering the IRQ Handler repeatedly.

Look at framing, parity, overrun, noise, etc errors being flagged.