Propeller Backpack Video Overlay

bunkerush5 · 2013-12-19 21:04

Hello,

Has anyone had success in displaying a variables value on the video overlay. I loaded the PropBP_overlay_demo from parallax with no problems but it seems as though you can only display strings. Just to test I tried to increment a value by 1 every second and display the result. Something online said to use the fullduplexserial but I am not sure how that would work properly. A little guidance would be greatly appreciated.

Thanks.

erco · 2013-12-19 21:20

If you post your code, people can spot problems faster.

Duane Degn · 2013-12-19 22:10

That's right, the overlay demo doesn't include a "dec" method.

I wrote a little demo which includes a "dec" method.

CON

  _clkmode      = xtal1 + pll8x
  _xinfreq      = 10_000_000


  BUF_SIZE      = 16384


OBJ


  pr : "prop_backpack_tv_overlay"
 ' io : "basic_sio"


VAR


  byte  buffer[BUF_SIZE]


PUB start | i


  pr.start(@buffer, BUF_SIZE)
 ' io.start
  i := 0
  repeat
    dec(i++)
    pr.out(pr#CR) ' carriage return
    waitcnt(clkfreq + cnt)
    
PUB dec(value) | i, nz
{
  This method taken from localroger's StrFmt object.
  add a signed random width decimal number as found
  in many output objects  
}
  if value < 0
    -value
    pr.out( "-")


  i := 1_000_000_000
  nz~


  repeat 10
    if value => i
      pr.out(value / i + "0")
      value //= i
      nz~~
    elseif nz or i == 1
      pr.out("0")
    i /= 10

I didn't connect my Backpack to a TV to test the program so let me know if it doesn't work.

Phil Pilgrim (PhiPi) · 2013-12-19 22:22

Simple_Numbers.spin in the Propeller library has a dec method that can be used with the overlay object's str method. My own extension, Simple_Numbers_Plus.spin (attached) offers additional functionality.

-Phil

bunkerush5 · 2013-12-20 10:16

Duane,

Thanks for your help. I was not able to get the variable to display using your code. The video image comes through but nothing else. Any idea what could be wrong?

bunkerush5 · 2013-12-20 10:26

Phil,

How do you go about using the dec method with the overlay str method? This is where I am stuck. I tried to do it with fullduplexserial like this and it did not work.

OBJ

pr : "prop_backpack_tv_overlay2"
serial:"FullDuplexSerial"

VAR

byte buffer[BUF_SIZE]
long x

PUB start | i

pr.start(@buffer, BUF_SIZE)

pause(2000)
serial.start(31, 30, 0, 9600)
'num.init
x:=1
repeat
x:=x+1

pr.str(string(DEFWIN, 10, 40, DBL|2, CHGCLR, $f, _0, 8|TPT, 1, APNDSP, 10, SHO|10, _0, 20, SHODSP, 10, WDWRAP, 1))
pr.str(string(serial.str(x, dec)))
pause(2000)

Phil Pilgrim (PhiPi) · 2013-12-20 10:38

You need to use the Simple_Numbers object that I pointed out above:

OBJ

  num : "Simple_Numbers"
  pr: "prop_backpack_tv_overlay2"

PUB start

  ...
  pr.str(num.dec(value))

-Phil

Duane Degn · 2013-12-20 10:40

FullDuplexSerial isn't going to help.

If you use the Simple_Numbers.spin in the OBJ section as:

num : "Simple_Numbers"

You should be able to display a number with:

pr.str(num.dec(x))"

I only looked at the numbers object in the Prop Tool library, I haven't looked at Phil's "plus" version but I bet it works the same.

Edit: Phil bet me to it but I see we pretty much say the same thing.

Duane Degn · 2013-12-20 10:47

To post code in the forum you really need to use code tags. In order for the tags to show up, I'm using a zero instead of an "O" in the word "code".

Start with a code tag.

[c0de]

' paste code between tags
x := 1

[/c0de]

If I change the "0" to "o" in the above lines, I get:

' paste code between tags
  x := 1

This way the indentation shows up correctly in the posted code.

skylight · 2013-12-20 12:43

you can also highlight all the code and then click the Hash(code) button in the editor to automatically wrap the tags around the code block.

Propeller Backpack Video Overlay

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