lwIP_Demo_Rowley_ARM7 and CDC receiving byte

Hi, I am new to FreeRTOS. Seems to be a great OS. I try to modify the demo code to have a simple ping-pong over the CDC. I add the following lines to several files : * lwIP_Demo_Rowley_ARM7USBUSB-CDC.c:262 unsigned vUSBReceiveByte( portCHAR * cByte ) {     if ( uxQueueMessagesWaiting( xRxCDC ) != 0 )     {         xQueueReceive( xRxCDC, cByte, usbNO_BLOCK );         return 1;     }     return 0; } /*————————————————————*/ * lwIP_Demo_Rowley_ARM7USBUSB-CDC.h:99 unsigned vUSBReceiveByte( portCHAR * cByte ); * lwIP_Demo_Rowley_ARM7main.c:313     if ( vUSBReceiveByte( &cTxByte ))     {         vUSBSendByte( cTxByte );     } With this code the OS seems to be completly frozen. What is false in my code ? And why ? Thanks in advance. Steve P.S. : I use the V5.0.2 of FreeRTOS.

lwIP_Demo_Rowley_ARM7 and CDC receiving byte

I think this demo uses an idle task hook function or something similar to continuously send characters in the background. Did you remove this code first? Just setting configUSE_IDLE_HOOK to 0 in FreeRTOSConfig.h might be enough.

lwIP_Demo_Rowley_ARM7 and CDC receiving byte

Hi, Currently, I use this hook to handle the Queue over vUSBReceiveByte(). I removed the code who continuously send characters. Thanks. Steve