Break signals over uart

[szilu]

Is there any way to transmit a break signal over UART1? I have to wake-up a device which is connected to the UART1 of my Fastrack Xtend FXT001.
Thanks for the replies in advance!

[awneil]

@szilu

Is there any way to transmit a break signal over UART1?

Not directly using FCM.
However, there is a “trick” to send a NUL at a reduced baud rate - which will have the effect of a BREAK.

This is described in a Maxim/Dallas App Note about their UART-to-1-Wire bridge chips; it was mentioned in this thread wavecom.com/modules/movie/sc … reak#p8220 - but the forum seems to have lost that!

Or you could use the Direct UART access…

[awneil]

@awneil

This is described in a Maxim/Dallas App Note about their UART-to-1-Wire bridge chips

Found it: pdfserv.maxim-ic.com/en/an/AN192.pdf 8)

@AN192

The DS2480B is reset if it detects a space in the stop-bit position. The easiest way to generate this is with a serial break longer than a 9600 baud 8-bit word. If break is not available on the host UART then switching to a slower baud rate and sending a zero byte can simulate a break. Switching to space parity or changing to a 9-bit word length with a zero in the most significant bit can also simulate a break.