Using TWR-SER2 with TWR-K70F120M for Ethernet

[#1]

TWR-K70F120M running MQX and RTCS can work with the Dual Phy on TWR-SER2. Below I list the modifications I did to the default BSP:

1) I add phy_dp83xxx.c and phy_dp83xxx.h to the bsp_twrk70f120m build project. These files are with MQX in /mqx/source/io/enet/Phy

2) I modify the BSP to use DP83xxx PHY for the Ethernet MACNET:

in the /mqx/source/bsp/twrk70f120m/init_enet.c:

#include "phy_dp83xxx.h"

const ENET_IF_STRUCT ENET_0 = {
     &MACNET_IF,
     //&phy_ksz8041_IF,
     &phy_dp83xxx_IF,
     MACNET_DEVICE_0,
     MACNET_DEVICE_0,
     BSP_ENET0_PHY_ADDR,
     BSP_ENET0_PHY_MII_SPEED
 };

3) MDIO line requires an external pull up resistor, per DP83849I Data sheet. As I didn't have one at the moment, I enable internal pull up on MCU pin PTB0.

in the /mqx/source/bsp/twrk70f120m/init_gpio.c:

//pctl->PCR[0] = PORT_PCR_MUX(4) | PORT_PCR_ODE_MASK; /* PTB0, RMII0_MDIO/MII0_MDIO   */
/* PTB0, RMII0_MDIO/MII0_MDIO   */
/* internal pull up enabled on MDIO */
pctl->PCR[0] = PORT_PCR_MUX(4) | PORT_PCR_ODE_MASK | PORT_PCR_PE_MASK | PORT_PCR_PS_MASK; 

With these changes, the RTCS applications work over TWR-SER2 Dual PHY channel A.

On TWR-SER2, J8 and J9 are un-shunted, SW1 = 11000000, SW2 = 10100000

on TWR-K70F120M, J18 is configured to disable 50 MHz OSC, as I use 50 MHz clock source from TWR-SER2 U504 50 MHz output. This clock is used to provide reference clock for the MCU (EXTAL), as well as for the Dual PHY X1 input (RMII reference clock).

[muhammad_qasim]

Hi

I had successfully run my Ethernet Driver on TWR-SER board for TWR-K70F120M but not working on TWR-SER2.

1. Is Ethernet Device in Single/Dual RMII mode is supported on TWR-SER2 board for TWR-K70F120M?  According to this link, (Line: 241) it is not supported?

2. If supported, then is there any change in signal settings like (MDC, MDIO, CRS_DV, RXDn, RXErr, TXDn, TXEN and RMII_REF_CLK) as compared to TWR-SER board?

Regards

[Kan_Li]

Hi

I had made it work on BSP for TWR-K53N512, besides jumper settings listed above, I just applied changes mentioned in step 3.

Thanks and Best Regards,

Kan

[DavidS]

Hi Hafiz,

I have successfully used TWR-SER and TWR-SER2 cards with MQX4.1 Ethernet applications for the TWR-K70F120M independently (i.e. only using one tower serial card at a time and not using both cards simultaneously).

Both TWR-SER and TWR-SER2 are running RMII and using the clock source from the respective TWR-SER(2) card to clock both the Ethernet PHY and the MCU which synchronizes the clock domains.

I can just swap the cards and run the same application code.

Note that when using the TWR-SER2 card I am only using one of the Ethernet ports ETH_A/J12.

Regards,

David