Define many constant in Assembly

**Ayne** · 2nd January 2007 06:34 AM

Code:

'   6x8 Font Table 
const font1 as byte[230] = 
(0x00, 0x00, 0x00, 0x00, 0x00 ,   '   space 
 0x00, 0x00, 0x2f, 0x00, 0x00 ,   '   ! 
 0x00, 0x07, 0x00, 0x07, 0x00 ,   '   " 
 0x14, 0x7f, 0x14, 0x7f, 0x14 ,   '   # 
 0x24, 0x2a, 0x7f, 0x2a, 0x12 ,   '   $ 
 0x62, 0x64, 0x08, 0x13, 0x23 ,   '   % 
 0x36, 0x49, 0x55, 0x22, 0x50 ,   '   & 
 0x00, 0x05, 0x03, 0x00, 0x00 ,   '   ' 
 0x00, 0x1c, 0x22, 0x41, 0x00 ,   '   ( 
 0x00, 0x41, 0x22, 0x1c, 0x00 ,   '   ) 
 0x14, 0x08, 0x3E, 0x08, 0x14 ,   '   * 
 0x08, 0x08, 0x3E, 0x08, 0x08 ,   '   + 
 0x00, 0x00, 0xA0, 0x60, 0x00 ,   '   , 
 0x08, 0x08, 0x08, 0x08, 0x08 ,   '   - 
 0x00, 0x60, 0x60, 0x00, 0x00 ,   '   . 
 0x20, 0x10, 0x08, 0x04, 0x02 ,   '   / 
 0x3E, 0x51, 0x49, 0x45, 0x3E ,   '   0 
 0x00, 0x42, 0x7F, 0x40, 0x00 ,   '   1 
 0x42, 0x61, 0x51, 0x49, 0x46 ,   '   2 
 0x21, 0x41, 0x45, 0x4B, 0x31 ,   '   3 
 0x18, 0x14, 0x12, 0x7F, 0x10 ,   '   4 
 0x27, 0x45, 0x45, 0x45, 0x39 ,   '   5 
 0x3C, 0x4A, 0x49, 0x49, 0x30 ,   '   6 
 0x01, 0x71, 0x09, 0x05, 0x03 ,   '   7 
 0x36, 0x49, 0x49, 0x49, 0x36 ,   '   8 
 0x06, 0x49, 0x49, 0x29, 0x1E ,   '   9 
 0x00, 0x36, 0x36, 0x00, 0x00 ,   '   : 
 0x00, 0x56, 0x36, 0x00, 0x00 , 
 0x08, 0x14, 0x22, 0x41, 0x00 ,   '   < 
 0x14, 0x14, 0x14, 0x14, 0x14 ,   '   = 
 0x00, 0x41, 0x22, 0x14, 0x08 ,   '   > 
 0x02, 0x01, 0x51, 0x09, 0x06 ,   '   ? 
 0x32, 0x49, 0x59, 0x51, 0x3E ,   '   @ 
 0x7C, 0x12, 0x11, 0x12, 0x7C ,   '   A 
 0x7F, 0x49, 0x49, 0x49, 0x36 ,   '   B 
 0x3E, 0x41, 0x41, 0x41, 0x22 ,   '   C 
 0x7F, 0x41, 0x41, 0x22, 0x1C ,   '   D 
 0x7F, 0x49, 0x49, 0x49, 0x41 ,   '   E 
 0x7F, 0x09, 0x09, 0x09, 0x01 ,   '   F 
 0x3E, 0x41, 0x49, 0x49, 0x7A ,   '   G 
 0x7F, 0x08, 0x08, 0x08, 0x7F ,   '   H 
 0x00, 0x41, 0x7F, 0x41, 0x00 ,   '   I 
 0x20, 0x40, 0x41, 0x3F, 0x01 ,   '   J 
 0x7F, 0x08, 0x14, 0x22, 0x41 ,   '   K 
 0x7F, 0x40, 0x40, 0x40, 0x40 ,   '   L 
 0x7F, 0x02, 0x0C, 0x02, 0x7F)    '   M 
  
 const font2 as byte[230] = 
(0x7F, 0x04, 0x08, 0x10, 0x7F ,   '   N 
 0x3E, 0x41, 0x41, 0x41, 0x3E ,   '   O 
 0x7F, 0x09, 0x09, 0x09, 0x06 ,   '   P 
 0x3E, 0x41, 0x51, 0x21, 0x5E ,   '   Q 
 0x7F, 0x09, 0x19, 0x29, 0x46 ,   '   R 
 0x46, 0x49, 0x49, 0x49, 0x31 ,   '   S 
 0x01, 0x01, 0x7F, 0x01, 0x01 ,   '   T 
 0x3F, 0x40, 0x40, 0x40, 0x3F ,   '   U 
 0x1F, 0x20, 0x40, 0x20, 0x1F ,   '   V 
 0x3F, 0x40, 0x38, 0x40, 0x3F ,   '   W 
 0x63, 0x14, 0x08, 0x14, 0x63 ,   '   X 
 0x07, 0x08, 0x70, 0x08, 0x07 ,   '   Y 
 0x61, 0x51, 0x49, 0x45, 0x43 ,   '   Z 
 0x00, 0x7F, 0x41, 0x41, 0x00 ,   '   [ 
 0x55, 0x2A, 0x55, 0x2A, 0x55 ,   '   / 
 0x00, 0x41, 0x41, 0x7F, 0x00 ,   '   ] 
 0x04, 0x02, 0x01, 0x02, 0x04 ,   '   ^ 
 0x40, 0x40, 0x40, 0x40, 0x40 ,   '   _ 
 0x00, 0x01, 0x02, 0x04, 0x00 ,   '   ' 
 0x20, 0x54, 0x54, 0x54, 0x78 ,   '   a 
 0x7F, 0x48, 0x44, 0x44, 0x38 ,   '   b 
 0x38, 0x44, 0x44, 0x44, 0x20 ,   '   c 
 0x38, 0x44, 0x44, 0x48, 0x7F ,   '   d 
 0x38, 0x54, 0x54, 0x54, 0x18 ,   '   e 
 0x08, 0x7E, 0x09, 0x01, 0x02 ,   '   f 
 0x18, 0xA4, 0xA4, 0xA4, 0x7C ,   '   g 
 0x7F, 0x08, 0x04, 0x04, 0x78 ,   '   h 
 0x00, 0x44, 0x7D, 0x40, 0x00 ,   '   i 
 0x40, 0x80, 0x84, 0x7D, 0x00 ,   '   j 
 0x7F, 0x10, 0x28, 0x44, 0x00 ,   '   k 
 0x00, 0x41, 0x7F, 0x40, 0x00 ,   '   l 
 0x7C, 0x04, 0x18, 0x04, 0x78 ,   '   m 
 0x7C, 0x08, 0x04, 0x04, 0x78 ,   '   n 
 0x38, 0x44, 0x44, 0x44, 0x38 ,   '   o 
 0xFC, 0x24, 0x24, 0x24, 0x18 ,   '   p 
 0x18, 0x24, 0x24, 0x18, 0xFC ,   '   q 
 0x7C, 0x08, 0x04, 0x04, 0x08 ,   '   r 
 0x48, 0x54, 0x54, 0x54, 0x20 ,   '   s 
 0x04, 0x3F, 0x44, 0x40, 0x20 ,   '   t 
 0x3C, 0x40, 0x40, 0x20, 0x7C ,   '   u 
 0x1C, 0x20, 0x40, 0x20, 0x1C ,   '   v 
 0x3C, 0x40, 0x30, 0x40, 0x3C ,   '   w 
 0x44, 0x28, 0x10, 0x28, 0x44 ,   '   x 
 0x1C, 0xA0, 0xA0, 0xA0, 0x7C ,   '   y 
 0x44, 0x64, 0x54, 0x4C, 0x44 ,   '   z 
 0x14, 0x14, 0x14, 0x14, 0x14)    '   horiz lines

How we define many constants in assembly

**Nigel Goodwin** · 2nd January 2007 06:46 AM

Using what processor?.

**Ayne** · 2nd January 2007 06:53 AM

Code:

sub procedure NOK_Write (dim data as byte, dim mode as byte) 
dim i as short 
         for i = 0 to 7 step 1 
     '   Pull DC high for DATA or low for COMMAND 
     if TestBit(mode,0) = 1 then 
       SetBit(PortC,5) 
     end if 
     if TestBit(mode,0) = 0 then 
       ClearBit(PortC,5) 
     end if
next i 
End Sub

How we define a local variable in Macro in assembly. As we define local variable (i as byte) in above code.

One thing more, if some one already have a prebuilt macro file for Nokia3310 LCD then plz share or any link???

**Ayne** · 2nd January 2007 06:58 AM

Pic16f877a

**Nigel Goodwin** · 2nd January 2007 07:56 AM

The only way on a PIC is to use RETLW tables. The MPASM helpfile shows you how to define them as data statements - or you could check my LED matrix tutorial, which defines fonts for display.

**Ayne** · 2nd January 2007 08:43 AM

dt - Define Table (PIC12/16 MCUs)
Syntax
[label] dt expr [, expr, ..., expr]
Description
dt - Data Table.

Generates a series of RETLW instructions, one instruction for each expr. Each expr must be an 8-bit value. Each character in a string is stored in its own RETLW instruction.

Usage
This directive is used in the following types of code: absolute or relocatable. For information on types of code, see Assembler Operation.

This directive is used when generating a table of data for the PIC12/16 device family. If you are using a PIC18 device, it is recommended that you use the table read/write (TBLRD/TBLWT) features. See the device data sheet for more information.

See Also
data db de dw
Simple Example
dt "A Message", 0
dt FirstValue, SecondValue, EndOfValues

i found this, i think this can help me.

But my second post???? < not answered

**Nigel Goodwin** · 2nd January 2007 09:22 AM

Originally Posted by Ayne

i found this, i think this can help me.

But my second post???? < not answered

Again, read the helpfile - it explains all about macros.

**Ayne** · 2nd January 2007 09:40 AM

can we countinu our program to next line in assembly(MPLAB). as in the following code

0x00, 0x2f, 0x00, 0x00 , ' !
0x00, 0x07, 0x00, 0x07, 0x00 ,

**Ayne** · 2nd January 2007 06:54 PM

Code:

		; PROGRAM CODE
START
		MOVLW	B'10101010'
		MOVWF	PORTB
		NOP
		MOVLW	B'01010101'
		MOVWF	PORTB
		NOP

		A DT 0x00, 0x00, 0x00, 0x00, 0x00 ,0x00, 0x07, 0x00, 0x07, 0x00 , 0x14, 0x7f, 0x14, 0x7f, 0x14 , 0x24, 0x2a, 0x7f, 0x2a, 0x12 

		End

As we can see there is a long data after "A DT". How can we put this data into two or three line???

**Nigel Goodwin** · 2nd January 2007 06:59 PM

Why not just write the table out?, it's hardly any different - here's a section of mine that I advised you to check earlier!. Notice I used binary as it makes it easy to see what's happening. Also please note, the fonts are upside down!.

Code:

Table		
		RETLW	b'00000000'		;SPACE
            	RETLW   b'00000000'
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00000000'

		RETLW	b'00000000'		;!
            	RETLW   b'00010000'
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00010000'		
            	RETLW   b'00010000'		
            	RETLW   b'00010000'		
            	RETLW   b'00010000'

		RETLW	b'00000000'		;"
            	RETLW   b'00000000'
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00000000'		
            	RETLW   b'00101000'		
            	RETLW   b'00101000'		
            	RETLW   b'00101000'

**Ayne** · 2nd January 2007 07:07 PM

yes u r right Nigel Goodwin, and DT command do the same job.
But it saves the time, there is no need of writing RETLW on each byte if i use DT command.
And i am learner i want to learn how to put long data into two or three lines??

**Ayne** · 2nd January 2007 07:12 PM

Have u any prebuilt library for nokia 3310 LCD

**Nigel Goodwin** · 2nd January 2007 08:59 PM

Originally Posted by Ayne

But it saves the time, there is no need of writing RETLW on each byte if i use DT command.

Have you never heard of 'copy and paste'?.

**Ayne** · 3rd January 2007 12:28 PM

Code:

sub procedure NOK_Write (dim data as byte, dim mode as byte) 
dim i as short 
     '   Pull DC high for DATA or low for COMMAND 
     if TestBit(mode,0) = 1 then 
       SetBit(PortC,5) 
     end if 
     if TestBit(mode,0) = 0 then 
       ClearBit(PortC,5) 
     end if 

     ClearBit(PortC,0)                                    '   CS = low 

     '   Clock in 8 bits of data - Highst bit first 
     for i = 7 to 0 step -1 
          ClearBit(PortC,4)                               '   SCLK = low 
          if TestBit(Data,i) = 0 then 
            ClearBit(PortC,6)                             '   SDA = low 
          else 
            SetBit(PortC,6)                               '   SDA = high 
          end if 
          SetBit(PortC,4)                                 '   SCLK = high 
     next i 
    SetBit(PortC,0)                                       '   CS = high 
end sub

I wrote the above program i assembly, i use dataa instead data cuz data is the reserve word of MPLAB.
Plz check the code............ it is write or worng???

Code:

;---------------------------------------------------------------------------------------------------
;		
;
;		NOK_Write	Macro
;---------------------------------------------------------------------------------------------------

NOK_Write	Macro	dataa, mode
		local		I

		if mode,0 == .1			;if mode = 1 then pull DC high
		bsf		DC
		endif

		if mode,0 == .0			;if mode = 0 for command pull DC low
		bcf		DC
		endif

		bcf		CS				;CS(Chip enable) low << because it active on low

    ;*************Clock in 8 bits of data - Highst bit first *************
		I 	equ		7

		bcf			SCLK		;SCLK - Serial Clock Input = low
		BTFSS		dataa,I
		bcf			SDA			;SDA  - Serial Data Input = low
		bsf			SDA			;SDA  - Serial Data Input = high
		bsf			SCLK		;SCLK - Serial Clock Input = high

		DECFSZ		I, F
		Goto		$ - 6
		bsf			CS			;CS   - Chip Enable = high
		
		Endm

I am in learning process, plz tell me if there is any thing wrong or how can i improve it.

**Nigel Goodwin** · 3rd January 2007 01:21 PM

Why are you trying to write a macro?.

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Define many constant in Assembly

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