Re: [PHP] Serial Comm problem

[Matijn Woudt]

On Tue, Dec 25, 2012 at 8:36 PM, Ken Arck  wrote:

> I'm pretty much a php newbie but have been programming for years in other
> languages
>
> Anyway...
>
> Using /dev/ttyS0. I need to set the serial port to 9600, send one command
> to an embedded processor board, then change the baud rate to 57600 and wait
> for a response. My code is working up to (and including) sending the
> command (and is being received correctly and acted on by the other device)
> but hangs up while waiting for the device to ACK back.
> --**--**
> -
> //set ttyS0 speed to 9600 to send  command
>  exec('stty -F /dev/ttyS0 9600');
>
>  // first open comport if it exists
>  $fp = fopen ("/dev/ttyS0", "w+");
>  if (!$fp) {
>  die( "Uh-oh. Port not opened.");
>  } else {
>}
>
> //send command
>   $fw = fwrite($fp, "1*21\r\n");
>
>
> //set ttyS0 speed to 57600 to for bootloader
>exec('stty -F /dev/ttyS0 57600');
>
> // wait for bootloader to send "^" (does not send CR or LF)
>
>echo "Waiting for Bootloader Active Character.\n" ;
>
>
>// Were good to
> here***
>
>
>   Do {
>  $InData = fgets($fp,1);
> }
>   While ($InData != "^") ;
> --**--**-
>
> I have also tried both While ($InData !=="^") ;  and While ($InData <>
> "^") ; for the last line but it always hangs in this loop and times out
> after 30 seconds
>
> The ^ is sent by the remove device with \r\n so I assumed telling fgets to
> look for one character should be enough but apparently it isn't.
>
> Any help would be greatly appreciated
>
> Ken
>

You should probably use fgetc if you only need one character.
You could also try $InData = exec('head -c 1 /dev/ttyS0');

- Matijn

Re: [PHP] Serial Comm problem

[Ken Arck]

At 11:36 AM 12/25/2012, you wrote:

The ^ is sent by the remove device with \r\n so I assumed telling 
fgets to look for one character should be enough but apparently it isn't.


<---Sorry but the above is wrong.


The ^ is sent by the remove device WITHOUT \r\n



Ken



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[PHP] Serial Comm problem

[Ken Arck]

I'm pretty much a php newbie but have been programming for years in 
other languages


Anyway...

Using /dev/ttyS0. I need to set the serial port to 9600, send one 
command to an embedded processor board, then change the baud rate to 
57600 and wait for a response. My code is working up to (and 
including) sending the command (and is being received correctly and 
acted on by the other device) but hangs up while waiting for the 
device to ACK back.

-
//set ttyS0 speed to 9600 to send  command
 exec('stty -F /dev/ttyS0 9600');

 // first open comport if it exists
 $fp = fopen ("/dev/ttyS0", "w+");
 if (!$fp) {
 die( "Uh-oh. Port not opened.");
 } else {
   }

//send command
  $fw = fwrite($fp, "1*21\r\n");


//set ttyS0 speed to 57600 to for bootloader
   exec('stty -F /dev/ttyS0 57600');

// wait for bootloader to send "^" (does not send CR or LF)

   echo "Waiting for Bootloader Active Character.\n" ;


   // **Were good to 
here*



  Do {
 $InData = fgets($fp,1);
}
  While ($InData != "^") ;
-

I have also tried both While ($InData !=="^") ;  and While ($InData 
<> "^") ; for the last line but it always hangs in this loop and 
times out after 30 seconds


The ^ is sent by the remove device with \r\n so I assumed telling 
fgets to look for one character should be enough but apparently it isn't.


Any help would be greatly appreciated

Ken