LPC1758 using RMII to connect switch chip

[sonic_hsieh]

Hello All,

I'm using LPC1758 to connect a four port switch (using RMII, mac to phy). I already configured EMAC module and can see frames are sent out from switch ports. It seems Tx in LPC1758 EMAC is working. But Rx is not working. I print the  two Rx registers: RxProduceIndex and RxConsumeIndex. Both of them are always zero. Is that any special config will cause Tx works but Rx not work.

Thanks.

[sonic_hsieh · Accepted solution]

Hello,

I think problem is solved. I find RMII RX_DV is wrong connected to other pin.

Fixed it and RMII Tx/Rx are working normally now.

Thanks the support.

[soledad]

Hi,

This issue may refer to memory locations, please check the below thread:

LPC1788 Ethernet DMA interrupt problem 

Have a great day,
Sol

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