Hi,

I am new to AT91 and want to use FreeRTOS on a AT91SAM7x256.
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_ARM7\USB\USB-CDC.c:262
unsigned vUSBReceiveByte( portCHAR * cByte )
{
if ( uxQueueMessagesWaiting( xRxCDC ) != 0 )
{
xQueueReceive( xRxCDC, cByte, usbNO_BLOCK );
return 1;
}
return 0;
}
/*------------------------------------------------------------*/

* lwIP_Demo_Rowley_ARM7\USB\USB-CDC.h:99
unsigned vUSBReceiveByte( portCHAR * cByte );

* lwIP_Demo_Rowley_ARM7\main.c:313
if ( vUSBReceiveByte( &cTxByte ))
{
vUSBSendByte( cTxByte );
}

With this code the OS seems to be completly frozen.

I hope that some people on this forum use FreeRTOS.

Has someone experience or a working code around send byte over the CDC layer ?

Thanks in advance.

Steve

P.S. : I use the V5.0.2 of FreeRTOS.