Sending some data clears UART interrupt bit

[kb24]

I am using STM32F042K6TX. I set UART read data register not empty interrupt, I am sending and receiving data.

This is how RXNEIE bit before it is corrupted.

In this code when "i" is 2 it clears RXNEIE bit. I tried all numbers 0-255 and only 2 does this. I am calling a function in Timer interrupt and the code above is in that function. Timer interrupt priority is lower than UART interrupt.

After sending 2 in fourth byte of data RXNEIE bit is like that. What should I do to solve this? Thank you.

[TDK]

It's possible data is received, the receive transfer completes, and the RXNEIE bit is cleared within the IRQ handler.

Doesn't seem like the code you posted affects it.

[Tesla DeLorean]

Inspecting the UART peripheral registers in the debugger will change the state, looking at UART->TDR has secondary consequences..