Posted on September 16, 2016 at 08:42My STM32F411 controller always returns HAL busy while UART receive interrupt  occured,   is this relative to hardware? can any one give me a sugestion.

Posted on September 16, 2016 at 07:58HI all!   i am using STM32F411 Controller . it returns BUSY while UART interrupt handling. give me  some suggestion on this it also shows over run erroer