Reading ROM

DF

I am trying to read the values in the sine table located in memory location $E000..$F001 in spin and output them to a serial terminal. I've monkeyed around with this for awhile, but am still very green to the prop. Can you set a variable to a specific memory location and not the hex value of E000..F001 in spin?
thAnks In AdvAncE

Mike Green

You can refer to a memory location by using LONG[], WORD[], and BYTE[] depending on the size of the value you want to access. For a long (32-bit) value at location $E000, use LONG[$E000]. I think the sine table consists of 16-bit words, so you'd use WORD[$E000] for those.

max72

Check this object:

http://obex.parallax.com/objects/627/

Massimo

DF

Mike Green wrote: »

You can refer to a memory location by using LONG[], WORD[], and BYTE[] depending on the size of the value you want to access. For a long (32-bit) value at location $E000, use LONG[$E000]. I think the sine table consists of 16-bit words, so you'd use WORD[$E000] for those.

How do you set a variable to these memory locations? I tried x=:word[$E000] but just got the decimal value of $E000 instead of the first sine value in the sine table.

DF

max72 wrote: »

Check this object:

http://obex.parallax.com/objects/627/

Massimo

I had already found this object and it helped quite a bit thanks

Mike Green

VAR word x

x := word[$E000]

This works. The first value is 0.

DF

PERFECT!! Thanks so much for your help