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
