Connect and DHCP IP

[pzydziak]

Hello,

I try to implement very simple function, let's name it connect_and_get_ip(void);

For now I have following code:

   struct netif fsl_netif0;    ip_addr_t fsl_netif0_ipaddr, fsl_netif0_netmask, fsl_netif0_gw;  void connect_and_get_ip(void) { // Setup IP Config for DHCP ...    IP4_ADDR(&fsl_netif0_ipaddr, 0,0,0,0);    IP4_ADDR(&fsl_netif0_netmask, 0,0,0,0);    IP4_ADDR(&fsl_netif0_gw, 0,0,0,0);      /* Add a network interface to the list of lwIP netifs. */    netif_add(&fsl_netif0, &fsl_netif0_ipaddr, &fsl_netif0_netmask, &fsl_netif0_gw, NULL, ethernetif_init, ethernet_input);    /* Set the network interface as the default network interface. */    netif_set_default(&fsl_netif0);    /* obtain the IP address, default gateway and subnet mask by using DHCP*/    dhcp_start(&fsl_netif0);      printf("got IP Address!");    // Make it active ...    netif_set_up(&fsl_netif0);    printf("%s : Interface is up : %d\n", __FUNCTION__, fsl_netif0.dhcp->state);    printf("%s : IP %s\n", __FUNCTION__, ipaddr_ntoa(&fsl_netif0.ip_addr));    printf("%s : NM %s\n", __FUNCTION__, ipaddr_ntoa(&fsl_netif0.netmask));    printf("%s : GW %s\n", __FUNCTION__, ipaddr_ntoa(&fsl_netif0.gw)); }  int main(void) {  /* Disable the mpu */    MPU_Type *base = MPU;    base->CESR &= ~MPU_CESR_VLD_MASK;    /* Init board hardware. */    BOARD_InitPins();    BOARD_BootClockRUN();    BOARD_InitDebugConsole(); connect_and_get_ip(); prox_agent_init();    for(;;) {      //not important   } }

Unfortunately I get "PHY Link down, please check the cable connection." on console. It happens during executing netif_add(...) function.

What am I doing wrong. I just simply want to connect to serwer and get IP.

Thank you.

Paweł Żydziak

[isaacavila]

Hello,

This message is received once PHY is initialized and cable detection is performed. In ethernetif.c file you can find the low_level_init function in which a while loop is waiting until activity on the PHY is received, if no activity is received a "timeout error" will be shown.

Be sure that cable is connected correctly and also that you are initializing Ethernet/PHY pins in the MCU.

I also didn't see any call to lwip_init(); before netif_add function is being called.

Hope this helps!

Regards,

Isaac

[pzydziak]

Could you provide me tutorial how to " initializing Ethernet/PHY pins in the MCU". Im pretty new in that stuff.

Best,

Paweł

[isaacavila]

Hello,

Which board are you using?

You can refer to any lwIP example that is located at board folder. For example, I am using lwip_httpsrv_bm_frdmk64f example located at <SDK_2_0_FRDM-K64F>/boards/frdmk64f/demo_apps/lwip/lwip_httpsrv

In FRDM-K64F, PTB0 and PTB1 pins are used as RMII0_MDC and RMII0_MDIO respectively, so they are configured in BOARD_InitPins as follows:

/* Affects PORTB_PCR1 register */
    PORT_SetPinMux(PORTB, 1u, kPORT_MuxAlt4);
    configENET.openDrainEnable = kPORT_OpenDrainEnable;
    configENET.mux = kPORT_MuxAlt4;
    configENET.pullSelect = kPORT_PullUp;
    /* Ungate the port clock */
    CLOCK_EnableClock(kCLOCK_PortA);
    /* Affects PORTB_PCR0 register */
    PORT_SetPinConfig(PORTB, 0u, &configENET);

And PTA12, PTA13, PTA14, PTA5, PTA15, PTA16 and PTA17 are also connected to PHY:

/* Affects PORTA_PCR13 register */
    PORT_SetPinMux(PORTA, 13u, kPORT_MuxAlt4);
    /* Affects PORTA_PCR12 register */
    PORT_SetPinMux(PORTA, 12u, kPORT_MuxAlt4);
    /* Affects PORTA_PCR14 register */
    PORT_SetPinMux(PORTA, 14u, kPORT_MuxAlt4);
    /* Affects PORTA_PCR5 register */
    PORT_SetPinMux(PORTA, 5u, kPORT_MuxAlt4);
    /* Affects PORTA_PCR16 register */
    PORT_SetPinMux(PORTA, 16u, kPORT_MuxAlt4);
    /* Affects PORTA_PCR17 register */
    PORT_SetPinMux(PORTA, 17u, kPORT_MuxAlt4);
    /* Affects PORTA_PCR15 register */
    PORT_SetPinMux(PORTA, 15u, kPORT_MuxAlt4);

You can check FRDM-K64F's schematic for more details.

Also, after BOARD_InitPins, BOARD_BootClockRUN and BOARD_InitDebugConsole function, lwip_init function is being called:

MPU_Type *base = MPU;
    BOARD_InitPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();
    /* Disable MPU. */
    base->CESR &= ~MPU_CESR_VLD_MASK;
    lwip_init();

I hope this helps!

Regards,

Isaac