Kinetis Microcontrollers中的主题 ENET uDMA and Descriptors https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229432#M4822 <HTML><HEAD></HEAD><BODY><P><BR />Hi,</P><P></P><P>I am using the TWR-K60N512 and the TWR-SER modules. My project is a CAN to Ethernet bridge bare-metal system.</P><P></P><P>Using the drivers provided by Freescale I am reasonably sure I have the ENET configured correctly. Also can take a register dump from the PHY and the contents look OK cross checking with the KSZ8041 Datasheet. When I connect the provided Ethernet cable to my PC I get both green LEDs active, with one LED flashing each time my PC sends an Ethernet packet (I am spying using MS Network Monitor).</P><P></P><P>I have hard coded a TX packet and called enet_transmit_packet function. So both TDAR and RDAR are set but no TX or RX events are occurring. The RX and TX descriptor ring buffers are never altered as I expect they would be.</P><P></P><P>My question is does the uDMA need any consideration? I am running a very simple bare metal system that has not touched the AIPS, DMA, etc.</P><P></P><P>Or any other tips would be greatly appreciated :-)</P><P></P><P>Matthew</P></BODY></HTML> Tue, 30 Jul 2013 04:25:24 GMT matthewdowsett 2013-07-30T04:25:24Z ENET uDMA and Descriptors https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229432#M4822 <HTML><HEAD></HEAD><BODY><P><BR />Hi,</P><P></P><P>I am using the TWR-K60N512 and the TWR-SER modules. My project is a CAN to Ethernet bridge bare-metal system.</P><P></P><P>Using the drivers provided by Freescale I am reasonably sure I have the ENET configured correctly. Also can take a register dump from the PHY and the contents look OK cross checking with the KSZ8041 Datasheet. When I connect the provided Ethernet cable to my PC I get both green LEDs active, with one LED flashing each time my PC sends an Ethernet packet (I am spying using MS Network Monitor).</P><P></P><P>I have hard coded a TX packet and called enet_transmit_packet function. So both TDAR and RDAR are set but no TX or RX events are occurring. The RX and TX descriptor ring buffers are never altered as I expect they would be.</P><P></P><P>My question is does the uDMA need any consideration? I am running a very simple bare metal system that has not touched the AIPS, DMA, etc.</P><P></P><P>Or any other tips would be greatly appreciated :-)</P><P></P><P>Matthew</P></BODY></HTML> Tue, 30 Jul 2013 04:25:24 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229432#M4822 matthewdowsett 2013-07-30T04:25:24Z Re: ENET uDMA and Descriptors https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229433#M4823 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>Problem solved - the issue was in the MCG setup - a clocking issue. It appears that the uDMA does not need any consideration other than clearing the MPU CESR VLD bit.</P><P></P><P>Matthew</P></BODY></HTML> Mon, 05 Aug 2013 01:58:48 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229433#M4823 matthewdowsett 2013-08-05T01:58:48Z Re: ENET uDMA and Descriptors https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229434#M4824 <HTML><HEAD></HEAD><BODY><P>Matthew,</P><P></P><P>that's great, thanks for sharing the workaround with us!</P><P>You rock!</P><P></P><P>Best,</P><P>Monica.</P></BODY></HTML> Fri, 16 Aug 2013 19:02:28 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/ENET-uDMA-and-Descriptors/m-p/229434#M4824 Monica 2013-08-16T19:02:28Z