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? > 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? Dan. ------------------------------------------------------------------------- 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
