PropBasic using 2 cogs

camelot2

hi, I am trying to use 2 cogs.In·cog0 I transmit some text to the terminal
and in cog1 I also transmitt some text to the terminal. The text sent in
cog0 gets displayed but the text sent in cog1 does not ! Can someone
show me what I am doing wrong. See my attached file. thanks - Dave

Bean

You need to release the serial pin in cog0 by making it an input.

Something like this:

SEROUT 30, BAUD, "in coq0"
TX_BYTE CR
INPUT 30
COGSTART Send_Data

Bean

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Use BASIC on the Propeller with the speed of assembly language.
PropBASIC thread http://forums.parallax.com/showthread.php?p=867134

March 2010 Nuts and Volts article·http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/prop/col/nvp5.pdf
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
There are two rules in life:
· 1) Never divulge all information

JonnyMac

One of the problems you will face is arbitration between the two cogs -- if both are writing to the same pin at the same time then your serial data will get trashed. You should set up a global flag so that a cog won't transmit while the other is in process.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Jon McPhalen
Hollywood, CA

Chuck Thomas

Bean,

I just tried this and got an invaild parameter error. Is this suppose to be coq0 or cog0? Or something eles. I've tried the cog vs coq and still received the same error.



Chuck

Bean

Chuck,
· Here is the modifed file.

Bean


▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Use BASIC on the Propeller with the speed of assembly language.
PropBASIC thread http://forums.parallax.com/showthread.php?p=867134

March 2010 Nuts and Volts article·http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/prop/col/nvp5.pdf
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
There are two rules in life:
· 1) Never divulge all information