Hi Dan On Thursday 21 June 2007 12:56:42 Dan Ellis wrote: > Gudjon I. Gudjonsson wrote: > > Hi > > I made the following c-code: > > > > // Initialize Module 0 in capture mode > > CCAPM0=0x21; // Capture positive edge first > > // for measuring pulse width > > flag_0=0; > > n=1; > > AUXR1=0x01; > > meas_end=res_dph_addr[n]; > > _asm > > mov dph, _meas_end > > mov dpl, #0 > > _endasm; > > AUXR1=0; > > meas_end=res_dph_addr[n+1]; > > [snip] > > > The variable meas_end is not set until after the _asm block but I need it > > before the block. Can anyone explain this behaviour? > > Have you tried declaring meas_end as volatile? Thanks, sorry I should have figured that out. > > > The other question > > > > I have spent the last two days on making a function that enables > > interrupts > > from PCA to make measurements. It should then wait for a keyboard input > > to finish the measurement. > > EC = 1; > > EA = 1; // Enable global interrupt > > CR = 1; > > ggetchar(); > > CR = 0; // Turn PCA timer off > > IE = 0x0; // Disable all interrupt > > where the functions are defined below. The problem is that the program > > always > > jumps over the ggetchar() function without waiting and even if I only > > put a > > while(1) statement instead of the ggetchar() function. > > I guess this means tedious debugging but if it is some simple > > misunderstanding > > I would be very happy :) > > Can you provide the asm output? > Sorry for that too. Another silly mistake. I did reti in the middle of the interrupt routine and the registers were not popped. For some reason it worked in a test code. But I wasted two days before disturbing you :)
Cheers Gudjon ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
