UART Overrun error

[Kim.Andy]

Hello,

I transfer data by uart interrupt(Uart_RX_IT_Start()).

Now UART overrun error is occurred continuously.

Should I have checked any point?

I want to use the uart interrupt, not DMA.

Thanks.

[KnarfB]

If overrun occurs, your interrupt handling is too slow or the transmission speed to high. Remedies:

• move stuff (like data processing) out of the interrupt handler into a queue+task
• use Release instead of Debug config for compiler options, use heavier compiler optimization
• avoid using HAL (overhead)
• do not use single char interrupts but cyclic DMA as a FIFO, maybe in conjunction with idle interrupt to detect idle conditions
• some MCUs have UARTS with hardware FIFOs which you may use

hth

KnarfB