MPC5748G ENET Transmission issue

[farozeibnejava]

Hi,

I am having some strange behavior with Ethernet in MPC5748G. i have successfully configured and perform transmission and reception from controller but in TXF interrupt after transmission if i read the status of any transmission buffer descriptor then that specific buffer descriptor somehow becomes locked and status bit (Ready) is never reset to 0 in that buffer descriptor for successive transmission calls even though frame is transmitted successfully on bus.

here is a sample code which causes issue,

if ((TxBufDesc[i].ControlWord0 & 0x80000000u) == 1) // Ready bit
{
    transmission_flag = 1;
}

now if i remove the above given check then successive transmissions are successful and buffer descriptor's Ready bit is reset to 0 by ENET controller.

[PetrS · Accepted solution]

Hi Danish,

This could be caused by cache. So try to disable the cache at all, or disable caching of the memory areas where TX/RX Buffer descriptors and TX/RX buffers are placed.

BR, Petr

[farozeibnejava]

Thanks, disabling Data Cache for region containing Buffers fixed the issue.

[phonghocle]

Hi Danish,

I'm having the same issue. Could you please tell me how to disable Data Cache for region containing Buffers?

Thanks.