Reading Array values into variables

[Tom Gonser]

The 4th post includes this:

SSD4= (ssmax[34]>>4)
SSD3= (ssmax[34] & $f)
SSD2= (ssmax[23]>>4)
SSD1= (ssmax[23] & $f)

It appears that somehow this is reading the digits out of the bytes, but I have never seen the notation before.

>>

& $f

Do these somehow mean first digit and second digit?

TG

[mister_e]

>>4 => shift byte 4 position to the right. so you keep only the 4 high bits
& $F => Bitwise and with hex F. so you keep only the 4 low bits

everything is in the PBP manual section 4.17

[Bruce]

It's no more difficult than copying data from a single variable to another.

X VAR BYTE
Y VAR BYTE

X = 3
Y = X

You can state X = SSMAX(23), Y = SSMAX(34), etc,,.

Since the resulting value will be a word, then use something like this;

SSMAX(23) contains 83h
SSMAX(34) contains 03h

Result VAR WORD

Result.LowByte = SSMAX(23) ' Place 83h into lowbyte
Result.HighByte = SSMAX(34) ' Place 03h into highbyte
HSEROUT [DEC Result] ' Print decimal value of 0383h = 899

[Tom Gonser]

Seems like I should be able to figure this out, but I can't ...

I have an array that contains 24 bits which equate to an altitude in tenths of meters.

alt[1]
alt[2]
alt[3]


I need to 1) display this, and 2) convert from meters to feet, so I need to stuff all these into a single variable which represents actual meters as opposed to tenths of meters, then convert to feet....

Any ideas out there? They way I am doing it now is not working. I am just reading these into alt1, alt2, alt2, and showing them as #alt1, #alt2, #alt3... I get 13130 which may be 131.30 meters,(which would be about right) but I am not sure. I am also not sure how to make this a single variable ..

Thanks !

Tom

[Demon]

I have no answer, but I do see an immediate problem.

A byte contains 8 bits, a word contains 2 bytes; that's a total of 16 bits.

There is a way to do 32 bit math, I saw a section in the manual. You work with 2 separate words or something, I didn't pay much attention.

Robert

[Demon]

Page 33, 4.17.1 - Multiplication.

Using * and **, / and //.

Good luck!

Robert

[Tom Gonser]

Exactly the problem.. I have 3 bytes that need to be put into one variable.. this is a 24 bit container that relates a number - the altitude in tenths of meters..

How to get this into ONE variable I can work with is the first issue..

Tom