stm32c0 enableIT i2c1 and usart1

[Hollis_K]

Hi, here I am facing the problem on I2C interrupt if USART enabled IT, my I2C IT does not work but it work correct if USART does not enable it interrupt. Any setting i missed out?

[TDK · Accepted solution]

USART and I2C are independent peripherals and can have interrupts enabled at the same time. Perhaps debug your code and look for issues as to why it's not working.

[Hollis_K]

Hi @TDK, I noticed that interrupt when LL_USART_EnableIT_RXNE and LL_USART_EnableIT_TXE, it will cause I2C unable trigger its interrupt although I tried send data to I2C. May I know why it happen? 

But, I have solved my issues because I only require Transmit complete in my program, just wondering why enable TXE and RXNE will lead these problems. 

Anyway, thanks.

[TDK]

> Hi @TDK, I noticed that interrupt when LL_USART_EnableIT_RXNE and LL_USART_EnableIT_TXE, it will cause I2C unable trigger its interrupt although I tried send data to I2C. May I know why it happen? 

Probably your code has a bug.