General Coding Questions

rcm14

For my project, I am using the Full Duplex Serial object for three aspects: 1) control an LCD, 2) control a line-of-sight infrared emitter/receiver pair, and 3) pass information to and from the computer screen. This is using 3 separate cogs, and (including these 3) am using all of the Propeller's 8 cogs. Is there anyway to consolidate the Full Duplex Serial so I'm not using so much space?

Also, I have had some trouble getting my 8th cog to start. I've scanned my code over and over and have only counted 8 cogs including cog 0 which is used to call the objects which contain the other cog calls. As of now my code is split into 3 sections: 1) Top Level File to control the setup of my system, 2) an LCD file to control my LCD operations, and 3) a serial communication file for the operation of the emitter/receiver pair. Again, is there anything I can do with my code to maybe help consolidate some space and possibly avoid problems with my cogs not starting?

Thank you for any help.

turbosupra

Are you counting PUB Main, which uses cog 0, or are you using another cog to manage cog calls?

Also, what type of timing updates/requirements do you need for the 3 full duplex serial cogs? I've never had the need to use more than 1 full duplex serial object and I'm not a very efficient coder.

Can you post your code to give us a better understand of what you are dealing with? You can go into File --> Archive --> Project and create a compressed file of your project and upload it/attach it to a forum post.

rcm14

I am counting PUB Main as cog 0.

I thought I would need three separate full duplex serial cogs since I had 3 separate tx/rx pin combinations that I needed to manage. But then again, that's why I'm asking this question.

I tried to upload an archived version, but for some reason the attachment manager couldn't find the file. Sorry. LaserTag.spin is the top file, and the other two are the main two objects other than the Full Duplex Serial.

gun_vest.spin
gunLCD.spin
LaserTag.spin

Mike Green

There is an object in the ObEx that provides up to 4 serial ports using just a single cog. It's lately gone through some revisions in this forum. You might look at the object and look back through the last week or so of Propeller forum threads.

rcm14

I do have one more quick question to add. For the "repeat while/until" type commands, when does the loop actually terminate once the condition is met?

For instance, here is some code:

PUB Main[INDENT]dira[0]~
dira[1]~~
repeat while ina[0] == 1[/INDENT]
[INDENT=2]!outa[1]
waitcnt(clkfreq + cnt)[/INDENT]

Let's say pin[0] is equal to 1, and the code is currently executing the waitcnt() command. Then while still executing the waitcnt() command, pin[0] goes to 0. Will the waitcnt() command finish before the repeat loop terminates?

JLocke

I believe this is the object you're looking for; see post #10 in the thread. I've just implemented it into a project using 2 ports, and it's working well so far.

http://forums.parallax.com/showthread.php?137349-yet-another-variant-fullDuplexSerial4portplus

rcm14

Awesome! Thank you all for the help!

kuroneko

rcm14 wrote: »

Let's say pin[0] is equal to 1, and the code is currently executing the waitcnt() command. Then while still executing the waitcnt() command, pin[0] goes to 0. Will the waitcnt() command finish before the repeat loop terminates?

waitcnt runs to completion. Only then (i.e. after about a sec) is the exit condition checked again. IOW, if you set a rather long delay said pin can change several times without having an effect.

Duane Degn

rcm14 wrote: »

I tried to upload an archived version, but for some reason the attachment manager couldn't find the file.

Windows 7 doesn't like programs using the "Program Files" folder to store data. The OS then "hides" these data files (at least it seems like hiding to me) in the "VirtualStore".

On my computer, files often end up in "C:\Users\Duane\AppData\Local\VirtualStore\Program Files (x86)\Parallax Inc\".