My prochip never works?

olivertog

why this will not work? I cant get any thing to follow th repeat command either?

con
_clkmode = Xtal1
_clkfreq = 5_000_000

var
long stack[noparse][[/noparse]9]

pub main
cognew(inverter, @stack)


PUB Inverter
dira ~
dira[noparse][[/noparse]6..7]~~
waitpeq(%10, %10, 0)
outa[noparse][[/noparse]6]~~
waitcnt(4_000_000 + cnt)
outa[noparse][[/noparse]6]~
waitcnt(4_000_000 + cnt)
outa[noparse][[/noparse]7]~~
waitcnt(4_000_000 + cnt)
outa[noparse][[/noparse]7]~
waitpeq(%00, %10, 0)
inverter

P!-Ro

If I counted right, you need more stack space than you are allowing.

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PG

Mike Green

1) The system clock is running at 5MHz, not 80MHz which is what is normally used. You need "_clkmode = xtal1 + pll16x" to make it 80MHz. At 5MHz, the WAITCNTs will be slower by a factor of 16.

2) At the end of Inverter, you have a recursive call to Inverter. This will very quickly use up the limited stack space and eventually start to fill up memory with stack frames from these calls without returns. A good initial stack space for simple routines without calls to other routines is 20 levels.

3) You didn't explain what happened or what you expected to happen.

olivertog

dira~
dira[noparse][[/noparse]6..7]~~
waitpeq(%10, %10, 0)

this is what my original code looks like, I want it to wait for me to make pin 1 high, then continue

Mike Green

That's what it should do, set pins 6 and 7 as outputs, wait for pin 1 to become high, then continue.

Notice that the main cog will quit after the COGNEW, but leave the 2nd cog running. This is because the implicit return from the PUB main goes to a cogstop.

olivertog

My problem is the waitpeq dosnt wait, Will it wait for ever? IF I have pin 1 high and run the program it works fine, if I have pin 1 low run program it hould be waiting for pin 1 to go high, correct? if I then make pin 1 high i get nothing like the program terminated. What could be my simple problem? If I also try and make repeat loops that are very simple they only reapeat 4 times then quit??

Mike Green

REPEAT loops normally work. The WAITPEQ/PNE should work. There must be something else going on, perhaps unrelated to your program. Post a schematic of your setup and a copy of the program that you're testing (after you fix the stack size and _clkmode statement)

StefanL38

Hello Oliver,

in your thread-headline you suspected the propeller-CHIP not to work
this could be easily checked by loading one of the example-codes

one more or less obvoius thing:

the numbers of the IO-Pin start at ZERO so Pin 1 is the SECOND Pin .


There are two errors inside the code that you posted

first error: stacksize

you defined

var
  long stack[noparse][[/noparse]9]

a stacksize of 9 is not enough in most cases
if the stack is too small your program can crash immediatly

take a size of 20 longs and sometimes it will be nescessary to take 200 longs

var
  long stack[noparse][[/noparse]20]

second:

if you call the method Inverter INSIDE itself this is RECURSIVE
This will eat up ALL THE 32kB of RAM after some time and then your program crashes down

if the code inside the method Inverter should be repeated you MUST use a repeat-loop

this code works properly

con
_clkmode = Xtal1
_clkfreq = 5_000_000

var
  long stack[noparse][[/noparse]20]
  
pub main
  cognew(inverter, @stack)

PUB Inverter
  repeat
    
    dira[noparse][[/noparse]6..7]~~
    waitpeq(%10, %10, 0)
    outa[noparse][[/noparse]6]~~
    waitcnt(4_000_000 + cnt)

    outa[noparse][[/noparse]6]~
    waitcnt(4_000_000 + cnt)

    outa[noparse][[/noparse]7]~~
    waitcnt(4_000_000 + cnt)

    outa[noparse][[/noparse]7]~
    waitpeq(%00, %10, 0)
    

some more hints:

use a clock of 80 MHz

CON    
  _clkmode = xtal1 + pll16x    'instead of  " _clkmode = xtal1"
  _xinfreq = 5_000_000

use ClkFreq instead of harcoded numbers in waitcnt

"ClkFreq + cnt" means a delay of 1 second

"ClkFreq / 10 + cnt" means a delay of 0,1 second

"ClkFreq * 5 + cnt" means a delay of 5 seconds

    waitcnt(ClkFreq / 4 + cnt) ' wait for 0.25 seconds

best regards

Stefan