Sending Info from one Pin to another

Palastine

Is there a command that take the output from one·pin in the propeller chip·and send to another pin in the propeller chip·to act as an output

for example i want to·take the·input from pin #1 and send it to pin 7 to produce the output.

Please help, thanks

stevenmess2004

There isn't a single command to do this. In spin you could do something like this

OUTA[noparse][[/noparse]outputPin]:=INA[noparse][[/noparse]inputPin]

In assembler you would so something like this

test inMask,INA wz
muxnz OUTA,outMask

inMask long |<inputPin
outMask long |<outputPin

Palastine

I will try that.

Thanks

Beau Schwabe

Palastine,

If you wanted to get tricky and you can work with the signal being inverted, you could do something using one of the Counters.

    DIRA[noparse][[/noparse]Bpin]~~                                        'Make BPin an Output
    CTRA :=  %01001 <<26 | Bpin <<9 | Apin              'Setup counter for POS detector with Feedback mode
    FRQA := 1                                           'Start Counter

All you have to do is run this once, and as long as the COG is kept alive doing other "stuff" the Apin will read the input value of the pin you assign, while the Bpin will reflect the INVERTED result of the value read·by the Apin.

·

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Palastine

Thank you, it really helped

Ken Peterson

Palastine: Is this just an exercise in Prop programming, or are you trying to solve a real problem by doing this? Because it seems you are essentially programming the Prop to act as a piece of wire. Why wouldn't you connect whatever is on output pin to the input pin instead?

I like·Beau's suggestion for another·reason:· This would really be useful if I needed an inverter or two and didn't want to add an inverter·chip or transistors to my design just for one or two inverters.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔


The more I know, the more I know I don't know.· Is this what they call Wisdom?

Post Edited (Ken Peterson) : 4/21/2008 1:55:19 PM GMT

hippy

I had to build an InPin -> map -> OutPin router and the Propeller could do that brilliantly; 16 pins could be routed at over a 4M samples per second rate at 80MHz ( as could other fast micros ) but a single Cog can do the same at 600ksps leaving 'seven full-speed micros free for other purposes'. This Propeller thing never ceases to impress me.