I don't have any ideas specific to Timer 1 and SDCC. But I do have a suggestion.
Are your ISRs being run? You need to make sure that your ISRs are defined when your main() routine is compiled, otherwise null, stand-in ISRs will be used instead. I have my ISRs defined in various, device specific files, but I make sure that they have declarations in header files that can be #included in main.c. Do you get any output when you print something with printf() or putchar()? --Mark Dennis Muhlestein wrote: > Hi all, > > I've been experimenting around with serial io on an 8051 development > board. I've run into the following situation. > > The board is a Cypress FX2LP. The Cypress kit comes with Keil trial > c51 compiler. The included keil examples for serial IO all use Timer > 1. Also, the 8051.com tutorials for serial IO/baud rate use Timer 1. > SDCCs examples (at least clock.c for the mcs51) also use timer 1 for > the baud rate. > > My problem is that all these examples work correctly with Timer 1 when > I compile them with Keil C51. When I use sdcc however, the baud rate > does not work. The 8051 won't receive any bytes (RI is never set) and > when transmitting, the client side just gets 0 bits (I used gtkterm to > monitor the incoming hex bytes.) > > Because the fx2lp has an additional timer, I tried that out with sdcc > and found that it does work. I compiled the keil examples as well as > the sdcc examples with the baud rate being generated from T2 instead > of T1 and the programs begin to function correctly. > > Does anyone know of a reason why T1 wouldn't work when I compile with > sdcc? > > Using sdcc 2.8.0 on Fedora core 8. I'd be happy to provide additional > code if anyone is interested. I have this exact problem simply using > the clock example in <sdcc>/device/examples/mcs51/clock though. > > > Thanks > Dennis > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Sdcc-user mailing list > Sdcc-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sdcc-user > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
