AM2432: EtherCAT with AM2432 & DP83822

Hi Jenita,

Jenita David said:

Log: (While taking the log Port 2 is connected with PC TwinCAT)

• If you're using the same port for scanning the device, can you try scanning from Port 1 (left port).

Also can you try disabling EnhancedLink feature and see if you're able to scan ?

Regards,
Aaron

Couple of additional checks to keep in mind:

• Ensure that auto-negotiation is enabled on the PHY and the AM243x, as the PHY needs to communicate with the other end of the link (e.g., EtherCAT master or switch) to establish the link speed and duplex mode. The DP83822 PHY supports both 100BASE-TX and 1000BASE-T Ethernet speeds, but auto-negotiation must be correctly configured to establish the link.
• Make sure that the PHY is configured in the MII mode for the AM243x. You should select the corresponding mode in SysConfig and make sure the proper pins are multiplexed for the PHY.
• Make sure that the PHY is configured in MII mode for the AM243x. You should select the corresponding mode in SysConfig and make sure the proper pins are multiplexed for the PHY.
• Ensure the correct PHY address is set. If using multiple PHYs, make sure they each have unique addresses. If you are using a single PHY, check that the PHY address is correctly assigned. From the logs, it looks like PHY address is correct.
• In SysConfig, ensure the Ethernet interface pins are correctly configured for the DP83822 PHY. You must ensure that the TX/RX lines, MDC/MDIO lines, and CLK pins are correctly assigned to the corresponding GPIOs or MII interface.
•  Check if the link is up from the MDIO Link Register (0x300B240C).

Also it would be good if you could provide the PHY Register values once the port is connected. The PHY Status register should provide the link status and whether auto-negotiation is successful.

Regards,
Aaron  

Hi Aaron, 

Aaron Thomas said:

If you're using the same port for scanning the device, can you try scanning from Port 1 (left port).

I checked with both the port, just to mention the particular log is taken while connected with port 2.

Aaron Thomas said:

Also can you try disabling EnhancedLink feature and see if you're able to scan ?

I'm not sure whether you mentioned this. If yes we did the below changes accordingly, still having issue

If no, kindly let me know what else to check.

Regards, 
D. Jenita

Hi Aaron, 

Thanks for the input.

Aaron Thomas said:

Ensure that auto-negotiation is enabled on the PHY and the AM243x, as the PHY needs to communicate with the other end of the link (e.g., EtherCAT master or switch) to establish the link speed and duplex mode. The DP83822 PHY supports both 100BASE-TX and 1000BASE-T Ethernet speeds, but auto-negotiation must be correctly configured to establish the link.

I have checked this in both H/W and F/W, Auto negotiation in enabled properly
We have set as Mode 1

F/W - BMCR(0x0000) Bit[12] is set -> Auto negotiation enabled

We have configured as 100BASE-TX in the code. And as per datasheet, DP83822 PHY does not support 1000BASE-T Speed, Kindly check.

Aaron Thomas said:

Make sure that the PHY is configured in the MII mode for the AM243x. You should select the corresponding mode in SysConfig and make sure the proper pins are multiplexed for the PHY.

In sysconfig Tx, RX, CLK, MDIO, MDC pins were configured correctly, But I'm not using the below LATCH, SYNC pins as it was not taken and removed from sysconfig as well. Does this cause any issue

Aaron Thomas said:

Check if the link is up from the MDIO Link Register (0x300B240C).

Checked this, working good

Regards,
D.Jenita

Jenita David said:

In sysconfig Tx, RX, CLK, MDIO, MDC pins were configured correctly, But I'm not using the below LATCH, SYNC pins as it was not taken and removed from sysconfig as well. Does this cause any issue

No, this should not

Hi Aaron, 

We have made the setup by removing DP83869 PHY IC from LP-AM2434 and connected DP83822 EVM. 

pins connected with DP83822 EVM,

RXD[0:3], RXDV, RXER, RXLINK, TXD[0:3], TXEN, MR_CLK, MT_CLK, RESET, INT pins

Works fine with the customized phy driver DP83822.

I have the same connections here with AM2432 but not detected in TwinCAT.

Also I tried IO (PHY Pinmux) configurations again. [Pinmux_config(gPru_icssg1_mii_g_rt1PinCfg, PINMUX_DOMAIN_ID_MAIN);]

Regards, 
D.Jenita

Hi Jenita,

Is it possible to share the PHY register values for both the PHYs ?

Jenita David said:

Checked this, working good

• I believe here the link polarity is configured correctly, that is, ACTIVE_HIGH if bit set in 0x300B240C and ACTIVE_LOW if bit unset while connecting the corresponding port to an active network.

Regards,
Aaron  

Hi Aaron, 

No Phys connected

I'm not getting bit unset here after disconnected from phy. 

When PHY 1 connected

When PHY 2 connected

Regards,
D.Jenita

Thank you for the details Jenita. From this, the MDIO Phy Address to be configured in sysconfig is 1 and 3 for ETHPHY0 and ETHPHY1 respectively. You can also try swapping the Phy Address between ETHPHY1 and ETHPHY0, that is, 1 for ETHPHY1 and 3 for ETHPHY0.

Also, if EnhancedLink is enabled, then configure the PHY polarity as Active Low as follows in : \examples\industrial_comms\ethercat_slave_demo\common\board\am243lp\ESL_BOARD_config.h

#define ECAT_PHYPOLINVERT_IN (false)
#define ECAT_PHYPOLINVERT_OUT (false)

true => Active HIGH
false => Active LOW

Regards,
Aaron

Hi Aaron,
 

Aaron Thomas said:

configure the PHY polarity as Active Low

I already tried that before that didn't works for me. But now along with those I also changed 

#define ECAT_PHYUSERXLINK_IN                (false)
#define ECAT_PHYUSERXLINK_OUT               (false)

Now port 2 is up with TwinCAT. I'm having issues with port 1.

What exactly happens by changing those two macros? Why I'm not getting port 1 up?

Kindly guide

Regards,
D. Jenita

Hi Jenita,

Jenita David said:

What exactly happens by changing those two macros?

• These two macros are required for enabling/disabling Enhanced Link for the ports. In order to achieve EtherCAT fast detection requirements, this needs to be enabled.
• Now that it is set to false, Enhanced Link feature has been disabled.

Looks like with Enhanced Link enabled, you're not getting an active link on both the ports. Make sure RXLINK pin is connected properly for this to be enabled. PHY link loss reaction time (link loss to link signal / LED output change) has to be faster than 15 us to Enable redundancy operation and Enhanced Link takes care of this timing constraint (Refer to Testing Cable Redundancy for the test scenario).

If Enhanced Link is disabled, the MDIO state machine-based detection is implemented, which is slow due to a serial link for messaging from the MDIO controller to the PHYs, which typically takes from 200 to 250 µs. MLINK/mii_rxlink detection occurs as fast as the PHY can toggle the link and typically within 10 µs.

The link polarity needs to be configured based on the status in Reg.0x300B240C if Enhanced Link is enabled.

Jenita David said:

Why I'm not getting port 1 up?

• This needs to be investigated further. Will have to check the PHY register values you shared earlier for the difference between 2 ports.

Regards,
Aaron

Hi Jenita,

Sorry for the delay due to other priorities.

Looks like these bits are not set for the PHY1. And looking at the PHYSTS register the Link Status, Duplex status, Auto-negotiation status, Signal Detect, MDI/MDIX mode bits are all 0. You can compare the PHY register values of the non-working port and compare it with the registers in the datasheet. 

Regards,
Aaron