🚀 go-pugleaf

McKool wrote:

>How can i make the port work sinchronous? which api function exist f�r send 
>a byte and get a return when the byte was received?

Don't open the port with FILE_FLAG_OVERLAPPED.
Use WriteFile() with lpOverlapped = NULL.

>> I could see with an osciloscope that the Low-Hight state which i want, i 
>> can make ik sending a 0x0 using as baudrate of 360. That is something ;-) 
>> . When i send the 0x0 i get a Low signal for exact 25 ml.  The problem is 
>> to calculate the time after that happens.

Is this what you need to happen?
 25 ms low,
 25ms high,
 then commands at 10400 baud?

>> The duration of send a 0x0 is (if i understud well)      (1/360)*1000 = 
>> 2,7777 ml . so, in order to send something in the next 25 ml shall the 
>> program wait theoretic

Huh?
There is no 360 setting. Docs say 300 or 600.
The duration of a character at 360 baud would be 1/36 second. The
duration of the 8 zero bits would be 1/45 second.
But, you are looking for a zero duration of 1/40 second (25 ms)
OTOH, if you set Parity to Even instead of None, then you would get a
Zero-Time of 1/40 second.
But, that makes it hard to get 25 ms of high.

>> This hardware is a standard device to communicate to a Car.  The name is 
>> K-Line and in order to start a comunication must be sent a 25 ml low, 25 
>> ml hight and some start bytes after that.  But it must be just 25ml, if it 
>> is not exact (+/- 1 ml) don't work.  I find a sample program mad in Delphi 
>> (only the Exe file) and i see in the osciloscope that it make just that 
>> what i want, so must to be a simple way.

Try this sequence:

CreateFile();
SetBaud(10400);
SetThreadPriority(Higher)
starttime=GetTime();
SetCommBreak();
while( (GetTime()-starttime) < 25ms );
ClearCommBreak();
SetThreadPriority(Normal)
/*Now for 25ms high.*/
WriteFile( 26 times 0xff )	/* (10400/10)/40 == 26 */
WriteFile(Commands)