MQX Software SolutionsのトピックK-70 USB Device CDC virtual com port stop sending data when stressed in full duplex mode. https://community.nxp.com/t5/MQX-Software-Solutions/K-70-USB-Device-CDC-virtual-com-port-stop-sending-data-when/m-p/296483#M9519 <HTML><HEAD></HEAD><BODY><P>I am <SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">using </SPAN>the MQX 4.1 and the <SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">associated USB device stack. I am using the IAR compiler. </SPAN></P><P><SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">I make a virtual COM port on the device, and when I communicate in half duplex (sending 4096 bytes from Windows 7 to the device, and waiting for the device to echo back the same 4096 bytes) every thing works fine. If I start echo back data once they are received the stack stop sending data after some time. I can remove the USB connection and reconnect but the connection from the device to the host will still be blocked. </SPAN></P><P><SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';"><BR /></SPAN></P><P><SPAN class="hps">Does anyone</SPAN> <SPAN class="hps">have any suggestions</SPAN><SPAN class="shorttext">?</SPAN></P><P><SPAN class="shorttext"><BR /></SPAN></P><P><SPAN class="shorttext">Poul-Erik.</SPAN></P><P><SPAN class="shorttext"><BR /></SPAN></P></BODY></HTML> Tue, 13 May 2014 09:20:44 GMT poul-erikhansen 2014-05-13T09:20:44Z K-70 USB Device CDC virtual com port stop sending data when stressed in full duplex mode. https://community.nxp.com/t5/MQX-Software-Solutions/K-70-USB-Device-CDC-virtual-com-port-stop-sending-data-when/m-p/296483#M9519 <HTML><HEAD></HEAD><BODY><P>I am <SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">using </SPAN>the MQX 4.1 and the <SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">associated USB device stack. I am using the IAR compiler. </SPAN></P><P><SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">I make a virtual COM port on the device, and when I communicate in half duplex (sending 4096 bytes from Windows 7 to the device, and waiting for the device to echo back the same 4096 bytes) every thing works fine. If I start echo back data once they are received the stack stop sending data after some time. I can remove the USB connection and reconnect but the connection from the device to the host will still be blocked. </SPAN></P><P><SPAN lang="EN" style="font-size: 12.0pt; font-family: 'Times New Roman','serif';"><BR /></SPAN></P><P><SPAN class="hps">Does anyone</SPAN> <SPAN class="hps">have any suggestions</SPAN><SPAN class="shorttext">?</SPAN></P><P><SPAN class="shorttext"><BR /></SPAN></P><P><SPAN class="shorttext">Poul-Erik.</SPAN></P><P><SPAN class="shorttext"><BR /></SPAN></P></BODY></HTML> Tue, 13 May 2014 09:20:44 GMT https://community.nxp.com/t5/MQX-Software-Solutions/K-70-USB-Device-CDC-virtual-com-port-stop-sending-data-when/m-p/296483#M9519 poul-erikhansen 2014-05-13T09:20:44Z