Using Break Signal - Serial Manager

[vianna . mauricio]

Unfortunately the duration is too critical (I have to get a 25mS of high 
signal and 25mS of low signal before I can transmit) with less than 2%  
variation. 

I tried to eliminate the Int32 problem which SysTaskDelay takes, and I put a 
dumb loop instead (just to check): 

if (blnBreak) {
	
	error = SrmControl(gPortID, srmCtlStartBreak, 0,&flagsSize);
		
	//Temporarily
	while (timeSecond < 1) {
		while (timeStamp < 9750) {
		   timeStamp++;
		}
		timeSecond++;
	}
		
	//SysTaskDelay(25*SysTicksPerSecond()/1000);
		
	error = SrmControl(gPortID, srmCtlStopBreak, 0,&flagsSize);
	
	timeSecond=0;
	timeStamp = 0;
	
      //Temporarily
	while (timeSecond < 1) {
	      while (timeStamp < 10050) {
		  timeStamp++;
	      }
	      timeSecond++;
	}
	//SysTaskDelay(27*SysTicksPerSecond()/1000);
		
} 

It gets a tiny low signal (almost a bit time) in the midle of high signal 
(3ms before high signal goes down). 

The problem persists. Do You think a 25mS high break signal is too short to 
srmCtlStopBreak? 

I'm using Palm Vx (dragonball 20MHz) which returns SysTicksPerSecond() = 
100, so the math 30*100/1000 = 3 Ticks or 30mS? 

[] 

Dave Lippincott writes: 

Here's one possible problem:
> SysTaskDelay(30*SysTicksPerSecond()/1000);
on most SysTicksPerSecond = 60
SysTaskDelay takes an Int32
Thus 30*60/1000 = 1 not 1.8 or 2  so your delay will always be too short.
If your break signal duration is not critical, try normalizing the value you
pass to SysTaskDelay to the next whole integer value. 

----- Original Message ----- 
From: "Alessandro Zummo" <[EMAIL PROTECTED]>
To: "Palm Developer Forum" <[EMAIL PROTECTED]>
Sent: Friday, September 19, 2003 9:15 AM
Subject: Re: Using Break Signal - Serial Manager 


On Fri, 19 Sep 2003 08:41:28 -0300
[EMAIL PROTECTED] wrote: 

> I'm using the srmControl with srmCtlStartBreak and srmCtlStopBreak,
> unfortunately, I didn't get a consistent break signal with it.
>
> Here is my code :
>
> if (blnBreak) {
>
> error = SrmControl(gPortID, srmCtlStartBreak, 0,&flagsSize);
>
> SysTaskDelay(30*SysTicksPerSecond()/1000);
>
> error = SrmControl(gPortID, srmCtlStopBreak, 0,&flagsSize);
>
> } 

 We had problems on the m125. Check the value your are passing to
SysTaskDelay()
and maybe increase it a little bit. 

 Which Palm(s) are you targeting? 

--  

 Best regards, 

 Alessandro Zummo,
  Tower Technologies - Turin, Italy 

  http://www.towertech.it 

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