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STM32F205 USART idle interrupt fires for no reason

Question asked by Burger.Niklaus on Apr 12, 2017
Latest reply on Apr 13, 2017 by Burger.Niklaus



I am implementing a USART driver and would like to use DMA for reception. In order to detect a timeout on the RX line, I use the USART idle interrupt.


The DMA works and I receive the expected characters. However once the line is idle, the IDLE interrupt is fired again and again. I have only enabled the IDLE interrupt, RXNE interrupt is disabled.


Based on the reference manual, I expect the IDLE interrupt to be fired only once after a reception, however this is not the case.


What could be the issue?