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stm32f4 usart max speed

Question asked by Roberto Fortunato on Apr 2, 2014
Latest reply on Apr 10, 2014 by Roberto Fortunato
I'm using stm32f407 combined with ftdi232h usb-serial converter.
Every byte I call an interrupt and send back the same byte to check.
This works fine with baud rate to 115200.
I have tried to force best baud rate (theoretically I can force to 9Mbaud).
I have tried 1Mbaud, 3Mbaud and others but the interrupt read correctly only first byte, second is totally corrupt (for example I send value 3 and read 191).
Does someone have experience how much I can force baud rate with a similar system?
If I use DMA I improve the situation? How much?
Is there some working example with high baud rate?