/**
  ******************************************************************************
  * @file    LwIP/LwIP_HTTP_Server_Netconn_RTOS/Src/app_ethernet.c 
  * @author  MCD Application Team
  * @brief   Ethernet specefic module
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "lwip/dhcp.h"
#include "lwip/inet.h"
#include "app_ethernet.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#ifdef USE_DHCP
#define MAX_DHCP_TRIES  4
__IO uint8_t DHCP_state = DHCP_OFF;
#endif

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Notify the User about the network interface config status
  * @param  netif: the network interface
  * @retval None
  */
void User_notification(struct netif *netif) 
{
  if (netif_is_up(netif))
  {
#ifdef USE_DHCP
    /* Update DHCP state machine */
    DHCP_state = DHCP_START;
#else  
    /* Turn On LED 1 to indicate ETH and LwIP init success*/
#endif /* USE_DHCP */
 }
 else
  {  
#ifdef USE_DHCP
    /* Update DHCP state machine */
    DHCP_state = DHCP_LINK_DOWN;
#else
    /* Turn On LED 2 to indicate ETH and LwIP init error */
#endif  /* USE_DHCP */ 
  } 
}

#ifdef USE_DHCP
volatile uint32_t dhcp_done;
/**
  * @brief  DHCP Process
  * @param  argument: network interface
  * @retval None
  */
void DHCP_thread(void const * argument)
{
  struct netif *netif = (struct netif *) argument;
  ip_addr_t ipaddr;
  ip_addr_t netmask;
  ip_addr_t gw;
  struct dhcp *dhcp;
  
  for (;;)
  {
    switch (DHCP_state)
    {
    case DHCP_START:
      {
        ip_addr_set_zero_ip4(&netif->ip_addr);
        ip_addr_set_zero_ip4(&netif->netmask);
        ip_addr_set_zero_ip4(&netif->gw);       
        dhcp_start(netif);
        DHCP_state = DHCP_WAIT_ADDRESS;
      }
      break;
      
    case DHCP_WAIT_ADDRESS:
      {                
        if (dhcp_supplied_address(netif)) 
        {
          DHCP_state = DHCP_ADDRESS_ASSIGNED;
          dhcp_done=1;
					printf("dhcp ip_addr is %s \r\n", inet_ntoa(netif->ip_addr));
        }
        else
        {
          dhcp = (struct dhcp *)netif_get_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP);

          /* DHCP timeout */
          if (dhcp->tries > MAX_DHCP_TRIES)
          {
            DHCP_state = DHCP_TIMEOUT;
            
            /* Stop DHCP */
            dhcp_stop(netif);
            
            /* Static address used */
            IP_ADDR4(&ipaddr, IP_ADDR0 ,IP_ADDR1 , IP_ADDR2 , IP_ADDR3 );
            IP_ADDR4(&netmask, NETMASK_ADDR0, NETMASK_ADDR1, NETMASK_ADDR2, NETMASK_ADDR3);
            IP_ADDR4(&gw, GW_ADDR0, GW_ADDR1, GW_ADDR2, GW_ADDR3);
            netif_set_addr(netif, ip_2_ip4(&ipaddr), ip_2_ip4(&netmask), ip_2_ip4(&gw));
            

          }
        }
      }
      break;
  case DHCP_LINK_DOWN:
    {
      /* Stop DHCP */
      dhcp_stop(netif);
      DHCP_state = DHCP_OFF;
    }
    break;
    default: break;
    }
    
    /* wait 250 ms */
    osDelay(250);
  }
}

void DHCP_open()
{
	DHCP_state = DHCP_START;
}

void DHCP_close()
{
	DHCP_state = DHCP_LINK_DOWN;
}
#endif  /* USE_DHCP */



/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/