topic Re: LPC1758 using RMII to connect switch chip in LPC Microcontrollers

LPC1758 using RMII to connect switch chip

sonic_hsieh — Mon, 03 Sep 2018 08:22:16 GMT

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.

Re: LPC1758 using RMII to connect switch chip

soledad — Thu, 06 Sep 2018 15:03:46 GMT

Hi,

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

LPC1788 Ethernet DMA interrupt problem

Have a great day,
Sol

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: LPC1758 using RMII to connect switch chip

sonic_hsieh — Wed, 12 Sep 2018 01:47:59 GMT

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.