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How could I use UART IDLE interrupt

Question asked by on Apr 28, 2013
        I want to use UART + DMA to receive unknown length packet. So I tried to use IDLE interrupt to monitor the end of the packet. On the other hand, I use a PC tools to send several bytes data and delay a while, send several bytes to generate the IDLE line condition. But unfortunately, I cannot receive IDLE interrupt. Could anyone can give some advise to how to generate the IDLE interrupt and deal with my case. The MCU I used is STM32L152.