Cytron Technical Forum

by **pingubrow2** » Fri Dec 30, 2011 12:31 am

how can I combined two project files in one , one of them is .c and the other .asm so I can have the final file works with both .asm and .c. to tell you the truth I am doing a project, temp sensor using lm35 and lcd 16*2 HD447082 . i have the temp sensor done with c and the lcd with assembly now I want to make them together so the final piece will work.

I am using hi tech for c(c18 compiler) and the microchip is pic18f4455 but that doesn't matter. I done some research on this I found something on linker but i have no idea of using this because there wasn't any instruction just some details about what is a linker anyway if someone had this problem and he/she fixed it can you help me by tell me what to do.

thx.

if you want more information tell me and I will post it .

by **ABSF** » Fri Dec 30, 2011 9:14 am

Wow! if that is possible, I would implement it on my PicBasic Pro programs with the smaller programs written in asm. :mrgreen:

The simpler solution is to embed your asm program into your C18 program using the #asm/#endasm pseudo in C compiler.

Once the C program is compiled into asm/obj codes. Not sure if it is compitible with the asm program you wrote. Besides, how does the c program talk to the LCD in asm? Do they share same common global strings and variables for communication? The asm programs are normally not relocatable meaing that it would occupy a rigid program location and all the labels are related to the ORG of the program. Once it is combined with C obj codes, the jump addresses would be wrong.

I'll wait for the C experts to come in to discuss on this interestig subject.

Allen

by **shahrul** » Fri Dec 30, 2011 9:30 am

I'm also don't know. That is possible?

by **Brian Griffin** » Fri Dec 30, 2011 11:32 am

ABSF WROTE:Wow! if that is possible, I would implement it on my PicBasic Pro programs with the smaller programs written in asm.

The simpler solution is to embed your asm program into your C18 program using the #asm/#endasm pseudo in C compiler.

Once the C program is compiled into asm/obj codes. Not sure if it is compitible with the asm program you wrote. Besides, how does the c program talk to the LCD in asm? Do they share same common global strings and variables for communication? The asm programs are normally not relocatable meaing that it would occupy a rigid program location and all the labels are related to the ORG of the program. Once it is combined with C obj codes, the jump addresses would be wrong.

I'll wait for the C experts to come in to discuss on this interestig subject.

Allen

Actually I read that in PICBasic Pro, it is possible to do inline assembly - the paid versions apparently allows you to do that. (I can't verify this!)

But, be very, very careful when you have to do inline assembly - make sure the "W" (working register) in those PIC is saved and preserved before going through the low level language. (That is not just only for the inline assembler, but in interrupts, you have to save more than just "W"!)

Here's the link if you need a guide in PicBasic pro: http://melabs.com/resources/pbpmanual/8_0.htm

by **ABSF** » Fri Dec 30, 2011 9:42 pm

Brian Griffin WROTE:Actually I read that in PICBasic Pro, it is possible to do inline assembly - the paid versions apparently allows you to do that. (I can't verify this!)

But, be very, very careful when you have to do inline assembly - make sure the "W" (working register) in those PIC is saved and preserved before going through the low level language. (That is not just only for the inline assembler, but in interrupts, you have to save more than just "W"!)

Here's the link if you need a guide in PicBasic pro: http://melabs.com/resources/pbpmanual/8_0.htm

Yes, the PBP does support inline asm using "@" - for single line instruction and "asm/endasm" for group of instrictions. The version that I am having can do that and I have tried it.

From what I understand what the OP wants is 2 separate programs, one written in HTC with file ext .C and one with assembler with file ext .asm to be linked by the linker to become one executable file. That's what make me think if it is possible to do.

Allen

by **Brian Griffin** » Fri Dec 30, 2011 10:20 pm

ABSF WROTE:
Brian Griffin WROTE:Actually I read that in PICBasic Pro, it is possible to do inline assembly - the paid versions apparently allows you to do that. (I can't verify this!)

But, be very, very careful when you have to do inline assembly - make sure the "W" (working register) in those PIC is saved and preserved before going through the low level language. (That is not just only for the inline assembler, but in interrupts, you have to save more than just "W"!)

Here's the link if you need a guide in PicBasic pro: http://melabs.com/resources/pbpmanual/8_0.htm

Yes, the PBP does support inline asm using "@" - for single line instruction and "asm/endasm" for group of instrictions. The version that I am having can do that and I have tried it.

From what I understand what the OP wants is 2 separate programs, one written in HTC with file ext .C and one with assembler with file ext .asm to be linked by the linker to become one executable file. That's what make me think if it is possible to do.

Allen

It is actually possible - FreeRTOS has been doing that on the MPLAB IDE where there is a .S file inside the includes.

However, it isn't easy to combine the ASM and the C together during compilation.

Are these ASM and the C files working together or independently in the system? Do the functions in C file calls the assembly routines in the ASM file?

by **pingubrow2** » Sun Jan 01, 2012 8:47 pm

First of all thx for posting.
Secondly yes both of them the .asm and .c works together , I have done the lcd with assembly because I tried with the microchip xlcd.h libary and it didn't work or I was doing the program wrong but when I was doing the lcd with c language I had some problems such as some commands weren't working and so on. If it isn't possible to combined the assembly and c to have one file works can some one show me what I am doing wrong with the lcd using c.

Someone said how I did the lcd with assembly here I am posting my lcd using assembly.
On my next post I will posting the program with c and please some one tell me what I am doing wrong ty all.

HERE IS LCD PROGRAM WITH ASSEMBLY ::

CODE: SELECT_ALL_CODE: MAIN ;WAIT FOR LCD TO TURN ON COMPLETELY 15ms NEEDED TO STABILIZE BSF PORTE,0 ;R/S THESE TWO BITS ARE SET HIGH SO THAT THE LCD WOULD TAKE BSF PORTE,1 ;R/W INTO CONSIDERATION WHEN THEY ARE CLEARED BSF PORTE,2 ;ENABLE BIT HIGH AS WELL CALL DELAY ;DELAYS TO GIVE TIME THE LCD TO INITIALIZE COMPLETELY CALL DELAY ;BOTH DELAYS ARE NEEDED ;CONVERTING TO 4 BIT MODE BCF PORTE,0 ;R/S INPUT LOW INDICATING THAT DATA FOLLOWING IS A COMMAND CALL SMALL_DELAY BCF PORTE,1 ;R/W LOW = WRITE COMMAND TO MODULE ;CALL SMALL_DELAY ; WAIT FOR SIGNAL TO STABILIZE NOP NOP MOVLW B'00100000' ;SETTING THE LCD INTO 4 BIT MODE USING BY CLEARING BIT4 MOVWF PORTD NOP ;******************************************************************* NOP ;* FIRST WE HAVE TO CONFIGURE THE LCD TO ACCEPT 4 BIT DATA TRANSFER* CALL CLOCK ;******************************************************************* NOP NOP CALL DELAY ;FUNCTION SET THIS HAS TO BE RE-SENT AGAIN AS FIRST WE NEED TO PUT THE LCD IN 4 BIT MODE MOVLW B'00100000' MOVWF PORTD ;4 BIT INTERFACE, 2 LINE MODE, 5*7 FORMAT NOP CALL CLOCK NOP MOVLW B'10000000' MOVWF PORTD NOP CALL CLOCK NOP NOP CALL DELAY ;CLEAR DISPLAY BCF PORTE,0 ;R/S INPUT LOW INDICATING THAT DATA FOLLOWING IS A COMMAND CALL SMALL_DELAY BCF PORTE,1 ;R/W LOW = WRITE COMMAND TO MODULE CALL SMALL_DELAY ; WAIT FOR SIGNAL TO STABILIZE MOVLW B'00000000' ;01H IS THE COMMAND TO CLEAR THE LCD MOVWF PORTD NOP NOP CALL CLOCK ;ENABLE COMMAND TO ENTER LCD MOVLW B'00010000' MOVWF PORTD NOP NOP CALL CLOCK ;ENABLE COMMAND TO ENTER LCD ;DISPLAY ON, CURSOR BLINKING, CURSOR UNDERLINE ON BCF PORTE,0 ;R/S INPUT LOW INDICATING THAT DATA FOLLOWING IS A COMMAND CALL SMALL_DELAY BCF PORTE,1 ;R/W LOW = WRITE COMMAND TO MODULE CALL SMALL_DELAY ; WAIT FOR SIGNAL TO STABILIZE MOVLW B'00000000' ;0CH MOVWF PORTD NOP NOP CALL CLOCK ;ENABLE COMMAND TO ENTER LCD MOVLW B'11000000' ;D3 = 1 (DEFAULT) MOVWF PORTD ;D2 = DISPLAY ON NOP ;D1 = CURSOR UNDERLINE OFF NOP ;D0 = BLINKING OFF CALL CLOCK ;ENABLE COMMAND TO ENTER LCD ;REMARK: EVEN THOUGH WE ARE TRANSFERRING DATA IN 4 BITS MODE, WE STILL NEED TO ;WRITE IN 8 BITS MODE THE ONLY DIFFERENCE IS THAT WE HAVE TO PUT THE NIBBLE THAT WE WANT TO ;TRANSFER IN THE MOST SIGNIFICANT BYTE. ; DETERMINING THE LOCATION OF THE WORD BCF PORTE,0 ;R/S INPUT LOW INDICATING THAT DATA FOLLOWING IS A COMMAND CALL SMALL_DELAY BCF PORTE,1 ;R/W LOW = WRITE COMMAND TO MODULE ;CALL SMALL_DELAY ; WAIT FOR SIGNAL TO STABILIZE NOP NOP MOVLW B'10000000' ;SET ADDRESS COMMAND STARTING WITH 1 THEN ENTER THE ADDRESS(B'1AAAAAAA') MOVWF PORTD NOP NOP CALL CLOCK ;ENABLE COMMAND TO ENTER LCD MOVLW B'00000000' ;SET ADDRESS COMMAND STARTING WITH 1 THEN ENTER THE ADDRESS(B'1AAAAAAA') MOVWF PORTD ;THIS IS ADDRESS 00H HOWEVER THE MSB MUST BE EQUAL TO 1 TO INDICATE THAT NOP ;THIS DATA IS AN ADDRESS NOP CALL CLOCK ;ENABLE COMMAND TO ENTER LCD ;CHARACTER ENTRY BSF PORTE,0 ;R/S LINE IN DATA TRANSFER MODE NOP NOP BCF PORTE,1 ;R/W LINE ON WRITE MODE CALL SMALL_DELAY NOP NOP MOVLW 'T'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'H'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'E'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW ' '; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'T'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'E'; MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK MOVLW 'M'; MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK MOVLW 'P'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'E'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'R'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'A'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'T'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'U'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'R'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'E'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW ' '; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'I'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'S'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW ':'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW ' '; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK ;============== MOVLW MOVWF TEMPRY MOVWF TEMPRY,PORTD NOP NOP CALL CLOCK NOP NOP SWAPF TEMPRY SWAPF TEMPRY,PORTD NOP NOP CALL CLOCK MOVLW B'11011111'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK MOVLW 'C'; ;SEND UPPER NIBBLE FIRST MOVWF TEMPRY MOVFF TEMPRY,PORTD NOP NOP CALL CLOCK ;ENABLE DATA TO ENTER LCD NOP NOP SWAPF TEMPRY ;HERE WE HAVE TO CHANGE THE LOWER NIBBLE MOVFF TEMPRY,PORTD ;WITH THE UPPER NIBBLE AND THEN SEND THE NIBBLE NOP NOP CALL CLOCK GOTO SEND ;THIS WILL END THE PROGRAM CLOCK BSF PORTE,2 ; ENABLE LCD CALL SMALL_DELAY BCF PORTE,2 ;DISABLES LCD CALL SMALL_DELAY RETURN DELAY MOVLW .2 MOVWF COUNT1 CLRF COUNT2 LINE2 CLRF COUNT3 LINE1 DECFSZ COUNT3,F GOTO LINE1 DECFSZ COUNT2,F GOTO LINE2 DECFSZ COUNT1,F GOTO LINE2 RETURN SMALL_DELAY MOVLW .10 MOVWF TIMER2 LABEL2 CLRF TIMER1 LABEL1 DECFSZ TIMER1 GOTO LABEL1 DECFSZ TIMER2 GOTO LABEL2 RETURN SEND GOTO $ ; THIS WILL STOP THE MICRO FROM STARTING TO EXECUTRE THE PROGRAME AGAIN EVEN AFTER ; SENDING IT TO THE END DIRECTIVE END

by **Brian Griffin** » Mon Jan 02, 2012 12:50 pm

Is there a reason why you have to write the LCD routines in ASM? The 44780 LCD routine isn't that fast or time-critical and you can safely do it using C, especially in PIC18F microcontrollers.

It would be simpler if you write both of these routines in C altogether.

by **pingubrow2** » Tue Jan 03, 2012 12:01 am

@ Brian Griffin
so first I tried to do the lcd with c but I had some problems with the xlcd , can you help me please anyway then I went on asm because I have some experience on assembly. I will post you my program to see it ( the lcd with c language ).

by **Brian Griffin** » Tue Jan 03, 2012 12:11 am

pingubrow2 WROTE:@ Brian Griffin
so first I tried to do the lcd with c but I had some problems with the xlcd , can you help me please anyway then I went on asm because I have some experience on assembly. I will post you my program to see it ( the lcd with c language ).

Pardon my ignorance but what's the Xlcd? Is it a specialized HD44780 serial LCD?

The LCD routines for C language is very straightforward. You can post it here.

Ah, and be sure to

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