New cog to run serial comms

realolman · 2009-01-22 21:23

I am using the following code to communicate serially with the propeller.· It, of course, includes Extended_FD_Serial

Is it OK to include only the portions of FD_Serial and Extended_FD_Serial that are used in the application?

And finally, to the question I originally wanted to know...· I want the serial communication to occur in a new cog so that I can use a different cog to do something else .· How do I figure how much stack space to allot to the new cog?·

I know there was a portion of one of the manuals that addressed that, but I didn't really understand it, and this seems to be much more complicated than the examples.

I just arbitrarily set it at 40, which seems to work. If I were to just keep decreasing it to just above the point that the serial comms didn't work, would that be sufficient?

OBJ 
SER : "Extended_FDSerial" 

VAR 
'place to put recieved transmission 
long MyVariable 
 
' to run new cog
long Stack[noparse][[/noparse]40] 

CON 
' spin stamp 
'_CLKMODE = XTAL1 + PLL4X ' clock speed too low = 1X=10Mhz 
'_XINFREQ = 10_000_000 
' non-spin stamp 
_CLKMODE = XTAL1 + PLL8X ' clock speed too high = 80Mhz 
_XINFREQ = 5_000_000 

PUB Main 
cognew (Serial, @Stack) 

Pub Serial 
'handle serial transmissions 

dira[noparse][[/noparse]17..21]:=%111111 

ser.start(31,30,0,38400) 

ser.str(string("Communication with propeller", $0D)) 
ser.dec(MyVariable) 

waitcnt(10_000 + cnt) 

ser.tx(13) 
ser.tx(10) 

outa[noparse][[/noparse]15] := 0 
repeat 
MyVariable :=ser.rxDec 
outa[noparse][[/noparse]17..21] :=MyVariable

Paul Baker · 2009-01-22 21:55

You can safely remove methods which are not used directly or by called methods. The compiler with throw an error if there is still a reference to a removed method which will indicate a dependency, replace the referenced method to get it functional again.

The stack question was asked (and answered) a couple days ago, check page 2, thread titled "Stack (Spin & PASM)" started by ImmNek.

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Paul Baker

Post Edited (Paul Baker) : 1/22/2009 10:00:32 PM GMT

New cog to run serial comms

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