In SX Microcontrollers, SX/B Compiler and SX-Key Tool, javalin wrote:

PJ,

I notice you're using shadow registers in the ISR to modify the pins.  Is this for a particular reason?  

Relevant code below:

                  mov w,Port                 ;get current state of port bits
                  and w,#%1111_1100     ;clear burst output bits
                  or w,BurstBits               ;merge in the current state of the burst bits
                  mov Port,w                  ;transfer the pre-calculated value for the port to the port
                  mov w,#IntConst          ;load w to interrupt again in 125 clocks..... 2.5 uSec


The reason I ask is that I am having issues with an SX application that reads two 115k serial inputs, buffers it and sends them out.  Essentially a serial relay app.  Periodically I have (i.e. half way through a relay of a CMU2CAM picture) a load of line errors.

I am using currently setb and clrb (based on the dualuart.src senix example) to manipulate the pins.

Cheers for any thoughts!

James

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=109670#m111053

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)