Hi, Ma XiaoJun told you to RTFM. Please do so.
> I tried > 1) > #include <reg51.h> > > sbit Beep = P1_5 ; > > > which is wrong Of course it is wrong. > 2) > #include <reg51.h> > sbit Beep; > .... > Beep=~Beep; Somewhere Beep needs to be defined. Preferably in an included header file or at the top of your C file in which it is used. > 3) > #include <reg51.h> Why are you still including a header file of which sdcc tells you not to ? Again I am assuming you are using a recent sdcc version because you still did not show us what version you are using. > // sbit Beep = P1_5 ; > > ... > P1_5=~P1_5; > > > which is still wrong P1_5 is in the reg51.h file and also in the 8051.h file. You might want to try "p1_5 = !p1_5;". But the reg51.h is old and should not be used anymore as sdcc tells you with a warning. roelof ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. A cloud service to automate IT design, transition and operations 2. Dashboards that offer high-level views of enterprise services 3. A single system of record for all IT processes http://p.sf.net/sfu/servicenow-d2d-j _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
