global variable block problem

Rimo · 2011-03-02 11:47

HI all!

I'm a newbie in spin language.
And have one question.I could not find it become.
For example:

VAR

byte time[7]

PUB clockSecond

return ?? how to return complete time block?

or how to accessing variable block in other object?

thanks to reply

Dave Hein · 2011-03-02 11:55

clockSecond could return a pointer to the time array, or you could use another method to return the pointer as follow:

PUB getTime
  return @time

Rimo · 2011-03-02 13:35

this is an pointer reference...

temp := long[ds1307.getTime]   'get pointer reference and load local variable long
      vga.dec(temp.byte[1])            '0...7 block

thanks but not working perfectly 0..3 index is ok but 4..7 so no good .. how to access next long ?

i reply:
vga.dec(byte[ds1307.getTime][1]) 'all block accessing

this is ok

Mike Green · 2011-03-02 13:48

temp := long[ds1307.getTime][1]
vga.dec(temp.byte[1])

It's much better to do:

temp := ds1307.getTime
vga.dec(byte[temp][1]) ' for byte 1 or you can do
vga.dec(long[temp][1]) ' for bytes 7..4 as a long

Dave Hein · 2011-03-02 13:57

Mike's suggestion is good, except that the time array only contains 7 bytes, and it may not be long aligned. It's better to access each element as a byte, such as byte[temp][0], byte[temp][1], ... byte[temp][6]. Technically, the index is not needed with the first byte, and you can access it as byte[temp].

Rimo · 2011-03-04 00:47

I like to read the per-byte value that then one i/o pins can convert martix controll.
This is "temp" variable i do no need.
I close my unit, so they:
vga.dec(byte[ds1307.getTime][N]) /where N is the requested block
But is it too will be so slow?
vga.dec only can use the debugging..
this is an matrix controll program proto version

repeat i from 0 to 7
      outa[i + iopincol[i]]~~                           'set colum pins high
      outa[iopinrow[((byte[timer.getfulltime][1]) / 10 + i)]]~~ 'set row pins high( / 10, one digit)
      waitcnt(clkfreq / 1000 * MartixMS + cnt
      'and set low etc.. etc...
dat
iopinrow   byte  0,1,2,3,4,5,6,7,8,9               'i/o pins directiva for rows
iopincol   byte  12,13,14,15,16,17                 'I/O pins directiva for colums

This is a nixie tube controller colums in anode(six tubes) rows in 0....9 digits katode...

RS_Jim · 2011-03-04 05:02

Rimo,
First of all welcome to this forum. I struggled for a long time with using global variables and Jonny Mac was very helpfull in extending my understanding of it. For a newbe, there are some great articles about the prop and the latest one is about passing global vars here http://http://www.parallax.com/Resources/NutsVoltsColumns/TheSpinZone/tabid/781/Default.aspxHere is a thread where he shows the passing of some vars to both a spin cog and a pasm cog: http://http://forums.parallax.com/showthread.php?128922-Passing-Memory-Address-I-am-stumped!
Hope this helps.
RS_Jim

global variable block problem

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