Stm32f407 uart

[ASSAAD.ASSAAD]

Posted on January 16, 2015 at 17:13

hello Every one

I need 6 usart communications  ; in stm32f407 we have only 4 usart and 2 uart

Infact I still dont know the main diffirence between usart and uart ; so can I use  uart as usart here ?

Thank you in advanced

[waclawek.jan]

Posted on January 16, 2015 at 17:28

USART means Univarsal Synchronous [and] Asynchronous Receiver-Transmitter, i.e. an interface you can put either in synchronous mode (inputting/outputting clock explicitly on an additional pin), or asynchronous mode (which - after level shifting - is the good old RS232).

UART is a simplified interface which does not work in the synchronous mode.

JW

[Tesla DeLorean]

Posted on January 16, 2015 at 18:21

The SYNCHRONOUS feature you're almost certainly NOT using.

[ASSAAD.ASSAAD]

Posted on January 20, 2015 at 15:51

Thank you all for help ;

So I understand the SYNCHRONOUS is a feature ; so I can use uart in usart ; right ?

[Tesla DeLorean]

Posted on January 20, 2015 at 17:20

You're using the serial ports in an ASYNCHRONOUS mode, so yes ALL the U(S)ART support that.

SYNCHRONOUS mode would use a clock signal. If you're not sure, you probably aren't using it, it's a specialized mode.