Post by thread:MPASM macro

Hi When I write a program for the PIC (or any other destination) I define 2 symbols and 1 definition for bit variables: b_redled equ 3 ;It's bit position in the file reg. m_redled equ 1 << b_redled ;It's mask value. #define f_redled port_a.,b_redled ;It's flag definition This way I can do the following: bsf f_redled ;Direct bit access with flagdefinition movlw (m_redled | ....) ;Byte manipulation with mask symbol tris port_a btfss temp,b_redled ;Bit access on a copy of the original file register. Instead of the 3 definitions above I would like to do it with one macro, something like: bitdef redled,3,port_a I havn't found a way to do this with mpasm's macro functions. The problem here is that I can't create new symbolnames based on a macro argument with a prefix added to it (b_, m_ and f_). Is there any way of doing this with mpasm ? (Of course I could do a preprocessor program that substituted the bitdef... with the 3 definitions above. This would, however, change the number of lines in the assembled source which in turn would mess up the line numbers from mpasm's error file.) ------------------------------------ Ruben Joensson AB Liros Elektronik Box 9124 200 39 Malmoe Sweden Tel +46 40 14 20 80 Mail: spam_OUTrubenTakeThisOuTsbbs.se ------------------------------------

Ruben Joensson wrote: <SNIP> >Instead of the 3 definitions above I would like to do it >with one macro, something like: > bitdef redled,3,port_a > >I havn't found a way to do this with mpasm's macro >functions. The problem here is that I can't create new >symbolnames based on a macro argument with a >prefix added to it (b_, m_ and f_). > >Is there any way of doing this with mpasm ? No. >(Of course I could do a preprocessor program that >substituted the bitdef... with the 3 definitions above. >This would, however, change the number of lines >in the assembled source which in turn would mess >up the line numbers from mpasm's error file.) I wish there was. I *once* worked with a language that had a macro processor that could do this - it really was as powerful as the language it was coupled with. It made stuff like you're proposing great to create and really easy. Unfortunately, such power is occasionally used for evil - I was responsible for maintaining an RTOS that was written *completely* with these types of macro functions (absolutely *no* code in the source) The first time I had to fix something, I had to go through each macro source file and turn on the listing function. It was hell. The original authors were all PhDs, which should explain why it was done this way. If you do come up with a preprocessor that has this type of function, I would be interested in seeing it. I think there are a lot of advantages to macro system like you are proposing. Good Luck! myke "Some people say that foreign cars handle best, while others say domestic. For my money, nothing handles as well as a rental car." - P.J. O'Rourke

Ciao at all of you, I'm 3 week old novice of PIC and have became an entusiastic of 16C84. As a case study I have decided to buid a RPM bar LED indicator for the motorcycle (like copy in progress indicator). Up to now I have encountered the tipical problems of the new processor that can be solved trying and testing, but now I have a sensation of frustration and impotence. Now I'm in trouble because I need to compose a routine like "case" or the tipical; " IF TMR0 >= 196 GOTO AnyLabel ELSE GOTO OtherLabel". From my local MICROCHIP distributor I have obtained the last CD ROM "1997 TECHNICAL LIBRARY SECOND EDITION", and I have printed out the 156 pages of "MPASM USER'S GUIDE" and under chapter 6, on page 75 I have found all instruction that seems very useful for me. (multiply, divide, less than, etc), but no words about the use of it. (Probably my bad english contribute in missing understanding). Looking on all routine that i have the opportunity to see, no macro one use of this operators. Why? I would like understand how build a macro using the aritmetic operators. I think this list shoul be the better place to discuss about this argument. Can someone illuminate my darkness. Thank in advance at all of you Saluti .....leo.depaloKILLspam@spam@telesys.it

Hi Leonardo >Question one: > >For easily the example I have change the TMR0 in Count >I do not have fully understand the meaning of the instructions > >SUBWF COUNT,W >BTFSC STATUS,0 > >first assumption: >assuming that the current value of Count is 200 >subtract from Count the value of 196 >The result is 4 and is stored back to Count >the carry should be on (is correct?) Yes CARRY is on. It is only CLEARED when there is a BORROW. The result 4 is stored in W,not in COUNT. To store in COUNT if the command is: SUBWF COUNT,F ;note the F at the end, meaning result is ;stored in the File register or COUNT. >Second assumption: >assuming that the current value of Count is 196 >subtract from Count the value of 196 >The result is 0 and is stored back to Count >the carry should be on (is correct?) As before, result is stored in W and CARRY on. >Third assumption: >assuming that the current value of Count is 190 >subtract from Count the value of 196 >The result is 249 (is correct?) and is stored back to Count >the carry should be off (is correct?) The result is 250 or 0xFA and stored in W not if COUNT. CARRY is OFF (correct). Subtraction works like this: 190 - 196 = 190 + 2'scomplement (196) 190 + 60 = 250 ; Note no overflow/carry 2's complement is done by negating and then add 1. 196 = 0xC4 = 0b11000100 negating: 0b11000100 -> 0b00111011 = 0x3B = 59 add 1 : 59 + 1 = 60 >Looking at the manual DS30430B on page 15 fig. 4-5, bit 0 is set ADDWF and >ADDLW and for me is not clear (probably for my bad english). >Could you please explain. Sorry I don't have the manual at this moment, but what register for bit 0 are you refering? {Quote hidden}>Question two: >Referring to the RPM pulse meter, I would like build a LED BAR METER like >"copy in progress". >This means, having ten LED to set on each LED at 1.000 RPM increase with >accuracy of 1.000 RPM (I know it is not a good instrument, but only >appearance light) > >I have build a grossolabe table like the following: > >Count =20 RPM=10.000 bit set on RB1, RB2, RB3 ,RB4, RB5, RB6, RB7, RA0, >RA1, RA2 >Count =28 RPM=9.000 bit set on RB1, RB2, RB3 ,RB4, RB5, RB6, RB7, RA0, >RA1 >Count =36 RPM=8.000 bit set on RB1, RB2, RB3 ,RB4, RB5, RB6, RB7, RA0 >Count =44 RPM=7000 bit set on RB1, RB2, RB3 ,RB4, RB5, RB6, RB7 >Count =54 RPM=6000 bit set on RB1, RB2, RB3 ,RB4, RB5, RB6 >Count =66 RPM=5000 bit set on RB1, RB2, RB3 ,RB4, RB5 >Count =72 RPM=4000 bit set on RB1, RB2, RB3 ,RB4 >Count =105 RPM=3000 bit set on RB1, RB2, RB3 >Count =144 RPM=2.000 bit set on RB1, RB2 >Count =240 RPM=1.000 bit set on RB1 > >I would like build a series of IF to test il the value of Count meet right >range. I'll try (untested): COUNT < 240, RB1 COUNT <144, RB1,RB2 . . . COUNT <20, .... ----- START: CLRF LIGHTS1 CLRF LIGHTS2 MOVLW 240 SUBWF COUNT,W BTFSC STATUS,0 GOTO LAST BSF STATUS,0 RLC LIGHTS1 MOVLW 144 SUBWF COUNT,W BTFSC STATUS,0 GOTO LAST BSF STATUS,0 RLC LIGHTS1 MOVLW 105 SUBWF COUNT,W BTFSC STATUS,0 GOTO LAST BSF STATUS,0 RLC LIGHTS1 . . . MOVLW 36 SUBWF COUNT,W BTFSC STATUS,0 GOTO LAST BSF STATUS,0 RLC LIGHTS1 MOVLW 28 SUBWF COUNT,W BTFSC STATUS,0 GOTO LAST BSF STATUS,0 RLC LIGHTS1 RLC LIGHTS2 MOVLW 20 SUBWF COUNT,W BTFSC STATUS,0 GOTO LAST BSF STATUS,0 RLC LIGHTS1 RLC LIGHTS2 LAST: RLC LIGHTS1 RLC LIGHTS2 MOVF LIGHTS1,W MOVWF PORTB MOVF LIGHTS2,W MOVWF PORTA Reggie