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DMA interrupt in STM32F407

Question asked by v.parthiban on Jun 8, 2015
Latest reply on Jun 8, 2015 by Clive One
Am trying Quadrature sampling in STM32F407 controller. DMA interrupt is happening in every 1.5ms, after filtering the values, 256 bits of data(one packet) will get ready in every 480ms. This was working fine. But when i enable the USART NVIC, the timing of the packet increases, that is its happening now in every 760ms. Moreover am not transmitting or receiving any data via USART. But still the timing get increased just by enabling the NVIC of USART. Am not sure what could be the issue. Am i missing something in the USART initialization. Please help me on this. Thank you in advance.