Serial TX on a pin required

brian4 · ‎2007-04-02

Posted on April 03, 2007 at 08:34

brian4 · ‎2007-04-02

Posted on April 02, 2007 at 12:07

Hi

Looking for some Assembly code for an ST7 29 Lite to transmit a few ASCII characters out an a single pin at 2400 Baud.

I have looked at the one in the application notes but that ones enables and disables the interrupts, I would like to keep the interrupts going as I have some timing routines going that are called every 2mS

I donâ€™t mind generating an interrupt but I donâ€™t want to disable them.

Any pointers would be helpful.

Re Brian

fggnrc · ‎2007-04-02

Posted on April 02, 2007 at 13:05

Brian,

have a look at Application Note 1753 (http://www.st.com/stonline/books/pdf/docs/9986.pdf)

brian4 · ‎2007-04-02

Posted on April 02, 2007 at 13:18

Hi

I Have looked at this app but this is the code that turns the interrupt on and then off (RIM SIM).

Looking for an alternative?

fggnrc · ‎2007-04-02

Posted on April 03, 2007 at 08:00

Brian, some time ago I posted in this forum (see message: ''I must reload IMMEDIATELY LTCSR2: can I?'') the code for a software UART that sends and receives characters at 9600 baud in half-duplex style.

Even if this code is somewhat outdated (I made some improvements), I think it is a base to start from.

Regards

EtaPhi

brian4 · ‎2007-04-02

Posted on April 03, 2007 at 08:34

Thanks, I will have a look