ETHNET DHCP

#include "dhcp_thread.h"/* Define the function to call for running a DHCP session. */UINT run_dhcp_client_session(NX_DHCP *client_ptr, NX_IP *ip_ptr);/* If define, debug output sent to Renesas Virtual Console */#define SEMI_HOSTING/* Define the wait limit for getting assigned an IP address. * NX_IP_PERIODIC_RATE is defined internally in NetX for converting * seconds to timer ticks. This timeout is defined for 2 seconds. */#define WAIT_TO_BE_BOUND ???????????(10*NX_IP_PERIODIC_RATE)/* Define error status returns */#define DHCP_RUN_ERRORS ????0x1001#define DHCP_START_ERROR ???0x1002/* If semi hosting is defined, define the debug output * method using printf. */#ifdef SEMI_HOSTING#include "stdio.h"#ifdef __GNUC__extern void initialise_monitor_handles(void);#endif#endif/* Define some global variables. */static UINT error_counter = 0;static UINT is_bound = NX_FALSE;/* Declare the DHCP Client state change callback. */static ?VOID ??my_notify_callback(NX_DHCP *dhcp_ptr, UCHAR new_state);char * xp_str_ip(char * x, uint32_t ip){ ???sprintf(x, "%u.%u.%u.%u", ???????????(uint8_t)(ip>>24 & 0xFF), ???????????(uint8_t)(ip>>16 & 0xFF), ???????????(uint8_t)(ip>>8 ?& 0xFF), ???????????(uint8_t)(ip>>0 ?& 0xFF)); ???return x;}/** * This function runs a DHCP Client session. * client_ptr; pointer to an NX_DHCP instance, an already created DHCP Client instance * ip_ptr; pointer to an NX_IP instance, an already created IP instance * If successful return NX_SUCCESS (0x0); else return DHCP_RUN_ERRORS error status. */UINT run_dhcp_client_session(NX_DHCP *client_ptr, NX_IP *ip_ptr){UINT ???????status;NX_PACKET ??*my_packet;ULONG ??????server_address;ULONG ??????client_address;ULONG ??????network_mask;UCHAR ??????buffer[4];UINT ???????buffer_size = 4;ULONG ??????*dns_server_ptr;UINT ???????wait = 0;UINT ???????wait_limit;char ???ip_string[20] = {0}; ?????/* Initialize the debug output utility. */#ifdef SEMI_HOSTING#ifdef __GNUC__ ???initialise_monitor_handles();#endif#endif ???/* Register a DHCP state change callback function. */ ???status = nx_dhcp_state_change_notify(client_ptr, my_notify_callback); ???if (status) ???????error_counter++; ???/* Now we‘re ready to start the DHCP Client. ?*/ ???status = ?nx_dhcp_start(client_ptr); ????/* Check the status. */ ???if (status) ???{ ???????error_counter++;#ifdef SEMI_HOSTING ???????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????{ ???????????/* Debugger is connected */ ???????????printf("Aborting DHCP Client. Failed DHCP start 0x%x\n", status); ???????}#endif ???????/* Internal DHCP error or NetX internal error. We cannot continue this demo test. */ ???????nx_dhcp_delete(client_ptr); ???????return DHCP_START_ERROR; ???}#ifdef SEMI_HOSTING ???????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????{ ???????????/* Debugger is connected */ ???????????printf("DHCP Client is running\n"); ???????}#endif ???/* Wait for the flag that the Client is Bound is set. */ ???wait = 0; ???wait_limit = WAIT_TO_BE_BOUND; ???while(wait < wait_limit) ???{ ???????/* If the is_bound flag is set, we have a valid IP address */ ???????if (is_bound == NX_TRUE) ???????????break; ???????/* Not bound yet. Let other application threads run. */ ???????tx_thread_sleep(100); ???????/* Update how long we‘ve waited */ ???????wait += 100; ???} ???/* Check if Client is bound to an IP address. */ ???if (is_bound) ???{#ifdef SEMI_HOSTING ???????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????{ ???????????/* Debugger is connected */ ???????????printf("DHCP Client is assigned an IP address lease.\n"); ???????}#endif ???????/* It is. Get the client IP address from this NetX service. */ ???????status = nx_ip_address_get(ip_ptr, &client_address, &network_mask); ???????/* Check for errors. */ ???????if (status) ???????????error_counter++; ???????else ???????{#ifdef SEMI_HOSTING ???????????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????????{ ???????????????/* Debugger is connected */ ???????????????printf("DHCP Client address is 0x%x. \n",(unsigned int)client_address); ???????????????xp_str_ip(ip_string, client_address); ???????????????printf("DHCP Client address is:%s\n",ip_string); ???????????}#endif ???????} ???????/* Get the DHCP Server IP address. ?*/ ???????status = nx_dhcp_server_address_get(client_ptr, &server_address); ???????/* Check for errors. */ ???????if (status) ???????{ ???????????error_counter++; ???????} ???????else ???????{ ???????????/* Check that the device is able to send and receive packets with this IP address. */ ???????????status = ?nx_icmp_ping(ip_ptr, server_address, "Hello World", sizeof("Hello World"), &my_packet, 3* NX_IP_PERIODIC_RATE);#ifdef SEMI_HOSTING ???????????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????????{ ???????????????/* Debugger is connected */ ???????????????printf("DHCP Server IP address is 0%x.\n", (unsigned int)server_address); ???????????????xp_str_ip(ip_string, server_address); ???????????????printf("DHCP Server address is:%s\n",ip_string); ???????????}#endif ???????????/* Check status. */ ???????????if (status) ???????????????/* No valid ICMP packet received (no packet to release). Update the error counter. */ ???????????????error_counter++; ???????????else ???????????{#ifdef SEMI_HOSTING ???????????????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????????????{ ???????????????????/* Debugger is connected */ ???????????????????printf("Successfully pinged Server.\n"); ???????????????}#endif ???????????????/* Release the echo response packet when we are done with it. */ ???????????????nx_packet_release(my_packet); ???????????} ???????} ???} ????/* Stop the DHCP Client. The application can still send and receive network packets. */ ???status = nx_dhcp_stop(client_ptr); ???if (status) ???????error_counter++; ???/* Prepare the DHCP Client to restart. We can still send and receive ????* packets except broadcast packets, but with a source IP address ????* of zero, is not very useful except for DHCP. */ ???status = nx_dhcp_reinitialize(client_ptr); ???if (status) ????????error_counter++;#ifdef SEMI_HOSTING ???if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???{ ???????/* Debugger is connected */ ???????printf("DHCP Client is reinitializing...\n"); ???}#endif ???/* Some time later.... */ ???tx_thread_sleep(100); ???/* Clear our previous DHCP session flag. */ ???is_bound = NX_FALSE; ???/* Restart the DHCP Client thread task. */ ???status = nx_dhcp_start(client_ptr);#ifdef SEMI_HOSTING ???if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???{ ???????/* Debugger is connected */ ???????printf("DHCP Client is restarted...\n"); ???}#endif ???/* Check status. ?*/ ???if (status) ???{ ???????/* Update the error count. */ ???????error_counter++;#ifdef SEMI_HOSTING ???????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????{ ???????????/* Debugger is connected */ ???????????printf("Aborting DHCP Client. Failed 2nd DHCP start 0x%x\n", status); ???????}#endif ???????/* Internal DHCP error or NetX internal error. We cannot continue this demo test. */ ???????nx_dhcp_delete(client_ptr); ???} ???else ???{ ???????/* This time we‘ll poll the IP instance directly for a valid IP address. ?*/ ???????wait = 0; ???????do ???????{ ???????????UINT actual_status; ???????????/* Check for address resolution. ?*/ ???????????status = nx_ip_status_check(ip_ptr, NX_IP_ADDRESS_RESOLVED, (ULONG *) &actual_status, NX_IP_PERIODIC_RATE); ???????????/* Check status. ?*/ ???????????if (status) ???????????{ ???????????????/* wait a bit. */ ???????????????tx_thread_sleep(NX_IP_PERIODIC_RATE); ???????????????wait += NX_IP_PERIODIC_RATE; ???????????????if (wait >= wait_limit) ???????????????{ ???????????????????break; ???????????????} ???????????} ???????} while (status != NX_SUCCESS); ???????/* Check if we have a valid address. */ ???????if (status == NX_SUCCESS) ???????{#ifdef SEMI_HOSTING ???????????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????????{ ???????????????/* Debugger is connected */ ???????????????printf("DHCP Client is assigned IP address lease for a second time.\n"); ???????????}#endif ???????????/* We do. This time, query the DHCP Client for the DNS Server address. ?*/ ???????????status = nx_dhcp_user_option_retrieve(client_ptr, NX_DHCP_OPTION_DNS_SVR, buffer, &buffer_size); ???????????/* Check status. ?*/ ???????????if (status) ???????????????error_counter++; ???????????else ???????????{ ???????????????dns_server_ptr = (ULONG *)(buffer); ???????????????/* Send a ping request to the DNS server. */ ???????????????status = ?nx_icmp_ping(ip_ptr, *dns_server_ptr, "Hello DNS Server", sizeof("Hello DNS Server"), &my_packet, 3* NX_IP_PERIODIC_RATE); ???????????????/* No valid ICMP packet received (no packet to release). Update the error counter. */ ???????????????if (status) ???????????????????error_counter++; ???????????????else ???????????????{#ifdef SEMI_HOSTING ???????????????????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????????????????{ ???????????????????????/* Debugger is connected */ ???????????????????????printf("Successfully pinged Server.\n"); ???????????????????}#endif ???????????????????/* Release the echo response packet when we are done with it. */ ???????????????????nx_packet_release(my_packet); ???????????????} ???????????} ???????????/* We‘re done with the DHCP Client. */ ???????????/* Release the IP address back to the Server. This application should not ??????????????send or receive packets with this IP address now. */ ???????????status = nx_dhcp_release(client_ptr); ???????????if (status) ???????????????error_counter++; ???????????else ???????????{#ifdef SEMI_HOSTING ???????????????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????????????{ ???????????????????/* Debugger is connected */ ???????????????????printf("Released IP address back to Server.\n"); ???????????????}#endif ???????????} ???????}#ifdef SEMI_HOSTING ???????if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???????{ ???????????/* Debugger is connected */ ???????????printf("Stopping the DHCP Client.\n"); ???????}#endif ????????/* Stop the DHCP Client and unbind the DHCP UDP socket.*/ ???????status = nx_dhcp_stop(client_ptr); ???????if (status) ???????????error_counter++; ???} ???/* All done. Delete the Client and release resources to NetX and ThreadX. */ ???status = nx_dhcp_delete(client_ptr); ???if (status) ???????error_counter++;#ifdef SEMI_HOSTING ???if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ???{ ???????/* Debugger is connected */ ???????printf("DHCP Client demo has completed with %d errors.\n", error_counter); ???}#endif ???/* Return a status value based on any errors encountered. */ ???if (error_counter == 0) ???{ ???????return NX_SUCCESS; ???} ???else ???{ ???????return DHCP_RUN_ERRORS; ???}}/** * This function defines a user callback for DHCP Client to notify * when there is a DHCP state change. * NX_DHCP *client_ptr; previously created DHCP Client instance * UCHAR state; 2 byte numeric representation of DHCP state * void * * In this callback, we only check if the DHCP * Client has changed to the bound state (has a valid IP * address) and we set a flag for the application to check. */VOID my_notify_callback(NX_DHCP *dhcp_ptr, UCHAR state){ ???UINT new_state = (UINT)state; ???NX_PARAMETER_NOT_USED(dhcp_ptr); ???/* Check if we have transitioned to the bound state ??????(have a valid IP address). */ ???if (new_state == NX_DHCP_STATE_BOUND) ???{ ???????/* We have. Set the flag for the application. */ ???????is_bound = NX_TRUE; ???}}/* Define the application thread. ?*/void dhcp_thread_entry(void){ ???UINT error_counter = 0; ???UINT status; ???/* Wait for the IP stack and network hardware ????* to get initialized. ????*/ ???tx_thread_sleep(3 *NX_IP_PERIODIC_RATE); ???/* Start and run a brief DHCP Client session. */ ???status = run_dhcp_client_session(&g_dhcp_client0, &g_ip0); ???/* Check for successful result. */ ???if (status) ???????error_counter++;}

DHCP Client is runningDHCP Client is assigned an IP address lease.DHCP Client address is 0xc0a81f7d. DHCP Client address is:192.168.31.125DHCP Server IP address is 0c0a81f01.DHCP Server address is:192.168.31.1Successfully pinged Server.DHCP Client is reinitializing...DHCP Client is restarted...DHCP Client is assigned IP address lease for a second time.Successfully pinged Server.Released IP address back to Server.Stopping the DHCP Client.DHCP Client demo has completed with 0 errors.