Program loading but not running

kylekenj · 2012-09-16 22:18

I created a program that would run on the quick start board so I build a PCB for to run it using a minimum board like http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/PropellerHardwareConnections.pdf. I was able to get the first board I built to read the chip and program after fixing my connections but it fried because I wasn't filtering my power supply. I fixed that on my next board and the propeller will read off the prop plug and I can program the ram and the eeprom but the program won't work I then tried to take a simpler program and used this code from ganster gadget.

CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000

OBJ
pst :"Parallax Serial Terminal"
PUB main
pst.Start(115200)
dira[0] :=1
repeat
outa[0] :=1
pst.str(string("LED ON",13))
waitcnt(clkfreq+cnt)
outa[0] :=0
pst.str(string("LED OFF",13))
waitcnt(clkfreq + cnt)

I checked everything with a voltmeter and everything looks good coming in. It loaded but doesn't seem to work. I am not sure what is wrong.

JonnyMac · 2012-09-16 22:57

You have a hardware problem because the code runs fine. I'm running this on a QuckStart. Note, too, that you should use the [ code ] and [ /code ] tags (remove spaces).

con

  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000
  

obj

  pst : "Parallax Serial Terminal"

  
pub  main

  pst.Start(115200)
  dira[16] :=1
  
  repeat
    outa[16] :=1
    pst.str(string("LED ON", 13))
    waitcnt(clkfreq+cnt)
    outa[16] :=0
    pst.str(string("LED OFF", 13))
    waitcnt(clkfreq + cnt)

average joe · 2012-09-17 02:40

Sounds like a fried PLL. Try

on

  _clkmode = xtal1
  _xinfreq = 5_000_000
  

obj

  pst : "Parallax Serial Terminal"

  
pub  main

  pst.Start(115200)
  dira[16] :=1
  
  repeat
    outa[16] :=1
    pst.str(string("LED ON", 13))
    waitcnt(clkfreq+cnt)
    outa[16] :=0
    pst.str(string("LED OFF", 13))
    waitcnt(clkfreq + cnt)

If that runs, it's confirmed fried PLL

Note to the guys @Parallax.... Please get rid of these examples that do not show bypass caps!!! I've seen several posts about this issue recently. Might help the "Beginner Friendly" image

MagIO2 · 2012-09-17 02:43

Try to run it with internal clock (maybe using a smaller baudrate). If this works there is probably something wrong with the crystal. You can also try out other xtal - settings.

Dave Hein · 2012-09-17 08:07

Post your schematic and pictures of your board. You may still have a problem with the power voltage going to the Prop. The power may be clean enough to run one cog, but when the program runs it starts up a second cog, which increases the current usage. You might need a few bypass caps, or there may be something else wrong with the power conditioning.

kylekenj · 2012-09-17 21:23

Thanks a ton guys. It was the lack of bypass caps. I used the tips to check. Sample program worked and my other program works great now.

Program loading but not running

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