MPASM 18F4550 getting started
Hi All,
Can someone please get me started by posting the first one or two pages of a working program using MCSP 3.0.0.0 with PBP 2.47 and MPASM together with a PIC18F4550. I am having great trouble getting the syntax right and I keep getting crazy errors when converting a satisfactorily working 16F877A program over to MPASM and the 18F4550.
I need to see how to get the first few define, include and device statements to work. Yes I have the MPASM manual, all 270 pages, and I am reading up on this as best I can, but it can be all a bit subtle as to where to use __ or _ and what goes in the first column or later.
I have installed MPASM in c:\mpasm and PBP in c:\pbp and my code in c:\testcode to get the path lengths to a minimum but I still get errors such as processor not defined, syntax errors and illegal declarations.
Any help gratefully received.
Cheers
Brian
Example will not compile for me - almost there.
Hello Darrel namesake.
I had a hard drive crash last week and had to replace the disk. I thought I had properly backed it up BUT a quick check this morning showed my MCS+ had reverted to 2.2.x.x. I reloaded MCS+ 3.0.0.0 and now I am nearly getting the 18F4550 to work. Not quite there though.
Sorry to appear ungrateful but the USB example does not do it for me.
a/ Surely we can stay within PBP and not need an ASM ..... ENDASM block at the start to configure the processor? No big deal, but a surprise to me.
b/ The USB example does not properly compile for me. I have unzipped all the files in the USB example and placed them in a directory c:\testcode. I have loaded the USBDemo.pbp into MCS+ (3.0.0.0) with PBP (2.47) and I have selected the 18F4550 in the MCS+ processor selection drop down. I have selected MPASM (freshly downloaded last week) as the assembler.
MPASM threw up many errors so I changed _FCMEN_OFF_1H to _FCMEM_OFF_1H which brought the errors down to ten lines of errors, all of the form:-
Error [118] c:\pbp\USBdemo.asm 128: Overwriting previous address contents (0000)
Error [118] c:\pbp\USBdemo.asm 134: Overwriting previous address contents (0000)
During the assembly, MPASM buts up a green box that flashes past then a red box and then MCS+ gives the error lines above. Page 159 of the MPASM User's Guide was not helpful.
What is the signifigance of the 'overwriting' errors? Is this a bug in the supplied example?
Cheers
Brian
