topic MCF5249C3  - Input Overrun in ColdFire/68K Microcontrollers and Processors https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5249C3-Input-Overrun/m-p/146274#M3241 <HTML><HEAD></HEAD><BODY><DIV> </DIV><SPAN>Hello Friends,</SPAN><BR /><BR /><SPAN>I am building an application with the Coldfire MCF5249C3 Development board from Freescale.</SPAN><BR /><SPAN>The application is to bridge Serial and Ethernet ports.&nbsp; We use uClinux with kernel 2.0 and 2.4.</SPAN><BR /><SPAN>I was able to write a user level program to make this bridge. But some how when I send data from the</SPAN><BR /><SPAN>Serial to Ethernet at baud rate greater than 38400 the data that comes on the Ethernet side is all</SPAN><BR /><SPAN>out of order and mixed up and I get a message from the kernel that "Input Overrun: ttyS1"</SPAN><BR /><BR /><SPAN>Can we do anything to avoid it.</SPAN><BR /><BR /><SPAN>Thanks</SPAN><BR /><SPAN>-Ajay Sharma</SPAN><BR /><SPAN>Newport Electronics</SPAN><BR /><BR /><SPAN>--<BR />Alban Edit: Please always include FSL Part Number in Message Subject line.</SPAN><BR /><DIV> </DIV><BR /><BR /><SPAN>Message Edited by Alban on </SPAN><SPAN class="date_text">2007-09-17</SPAN><SPAN> </SPAN><SPAN class="time_text">10:53 AM</SPAN></BODY></HTML> Sat, 15 Sep 2007 01:48:54 GMT ajaygnsharma 2007-09-15T01:48:54Z MCF5249C3  - Input Overrun https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5249C3-Input-Overrun/m-p/146274#M3241 <HTML><HEAD></HEAD><BODY><DIV> </DIV><SPAN>Hello Friends,</SPAN><BR /><BR /><SPAN>I am building an application with the Coldfire MCF5249C3 Development board from Freescale.</SPAN><BR /><SPAN>The application is to bridge Serial and Ethernet ports.&nbsp; We use uClinux with kernel 2.0 and 2.4.</SPAN><BR /><SPAN>I was able to write a user level program to make this bridge. But some how when I send data from the</SPAN><BR /><SPAN>Serial to Ethernet at baud rate greater than 38400 the data that comes on the Ethernet side is all</SPAN><BR /><SPAN>out of order and mixed up and I get a message from the kernel that "Input Overrun: ttyS1"</SPAN><BR /><BR /><SPAN>Can we do anything to avoid it.</SPAN><BR /><BR /><SPAN>Thanks</SPAN><BR /><SPAN>-Ajay Sharma</SPAN><BR /><SPAN>Newport Electronics</SPAN><BR /><BR /><SPAN>--<BR />Alban Edit: Please always include FSL Part Number in Message Subject line.</SPAN><BR /><DIV> </DIV><BR /><BR /><SPAN>Message Edited by Alban on </SPAN><SPAN class="date_text">2007-09-17</SPAN><SPAN> </SPAN><SPAN class="time_text">10:53 AM</SPAN></BODY></HTML> Sat, 15 Sep 2007 01:48:54 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5249C3-Input-Overrun/m-p/146274#M3241 ajaygnsharma 2007-09-15T01:48:54Z Re: MCF5249C3 - Input Overrun https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5249C3-Input-Overrun/m-p/146275#M3242 <HTML><HEAD></HEAD><BODY><DIV>Hi</DIV><DIV>&nbsp;</DIV><DIV>It sounds like you may be expecting the Ethernet side to work more quickly than it does. How are you transmitting the data? If you are transmitting a byte at a time with a TCP socket then there is a considerable amount of work going on in the stack and round trip delays for the ACKs. Buffering the data before you send it may work.</DIV><DIV>&nbsp;</DIV><DIV>IIRC I saw a document written by Mark Butcher (<A href="http://www.utasker.com" rel="nofollow" target="_blank">www.utasker.com</A>) who posts here, that explained this very well, in the context of creating a serial-&gt;Ethernet bridge for uTasker.</DIV><DIV>&nbsp;</DIV><DIV>Cheers,</DIV><DIV>&nbsp;</DIV><DIV>Paul.</DIV></BODY></HTML> Mon, 17 Sep 2007 16:59:47 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5249C3-Input-Overrun/m-p/146275#M3242 mccPaul 2007-09-17T16:59:47Z