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How to convert code for angle display using 8051 assembly?

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DrWhoF

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Code for angle display

I receive a string with coded angle from 0° to 360° (01h 68h). I would like to display this angle as -180° for 0° and +180° for 360°.
What will be the easiest way of converting these values using 8051 assembly?
Thanks.
DrWho
 

Re: Code for angle display

In pseudocode:
Code: 
subtract 180
if negative (carry set)
  display "-"
  make complement of value
else
  optionally display "+"
endif
divide value by 100
if result > 0 display it
divide remainder by 10
if result >0 display it
display remainder
display  °
done

All of this should convert to '51 asm quite straighforwardly.

wek
 

    D

    DrWhoF

    Points: 2
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Re: Code for angle display

Try this code:
; Bit NumBelow180 is set when NumberHNumberL<180 and cleared if NumberHNumberL>180

Angle_Display: CLR C ; 01h 68h = 360d
MOV A, NumberH
CJNE A, #01h, Not_1 ; #01h
NOP ; NumberH = 01h
SJMP Check_Cont3
Not_1: JC Check_Cont1 ; NumberH < 01h
LJMP Set_Number ; NumberH > 01h
Check_Cont1: CLR C
MOV A, NumberL
CJNE A, #68h, Not_68 ; #68h
CLR C ; Number = 68h
SJMP Check_Cont2
Not_68: JC Check_Cont2 ; NumberL < 68h
Check_180: CLR C ; NumberL > 68h
MOV A, NumberL
CJNE A, #0B4h, Not_B4
CLR C ; NumberL = 180d
SJMP Check_Cont3
Not_B4: JC Check_Cont2 ; NumberL < 180d
More_180: CLR NumBelow180 ; NumberL > 180d
SJMP Check_Cont3

Check_Cont2: SETB NumBelow180
MOV Tmp0, #0B4h ; Number=180-Number Sign=-
MOV Tmp1, #00h
MOV Op0, NumberL
MOV Op1, #00h
SJMP Check_Cont4

Set_Number: MOV NumberL, #68h
MOV NumberH, #01h

Check_Cont3: MOV Tmp0, NumberL ; Number=Number-180 Sign=+
MOV Tmp1, NumberH
MOV Op0, #0B4h
MOV Op1, #00h

Check_Cont4: CLR C
MOV A, Tmp0
SUBB A, Op0
MOV NumberL, A
MOV A, Tmp1
SUBB A, Op1
MOV NumberH, A
RET
Click to expand...
Regards,
IanP
 

    D

    DrWhoF

    Points: 2
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Re: Code for angle display

Thank you very much for the code.
If I needed to move "0" by +/- 5 numbers to the left or right - to set physical zero - how much will this complicate the code?
Thanks.
DrWho
 

Re: Code for angle display

Not very much ..
If Constant is the name of number you want to add or subtract from NumberHNumberl then you can do the following:

Sbtract_Number:
CLR C
MOV A, NumberL
SUBB A, Constant
MOV NumberL, A
MOV A, NumberH
SUBB A, #00h
MOV NumberH, A
RET

Add_Number:
CLR C
MOV A, NumberL
ADDC A, Constant
MOV NumberL, A
MOV A, NumberH
ADDC A, #00h
MOV NumberH, A
RET

But first you will need to check if NumberHNumberL is bigger then Constant or smaller than 360-Constant, so bot operations can be done ..
An example on chow to check these conditions you will find in the previous post ..

Regards,
IanP
 

    D

    DrWhoF

    Points: 2
    Helpful Answer Positive Rating
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