DHCP API:

　　nx_dhcp_create

　　nx_dhcp_start

　　nx_dhcp_stop

　　nx_dhcp_delete

　　nx_ip_address_get　　　　　　　　//客戶端IP獲取

　　nx_dhcp_server_address_get　　　　//DHCP SERVER

　　nx_icmp_ping　　　　　　　　//ping命令

　　nx_dhcp_reinitialize

　　nx_dns_host_by_name_get　　//通過域名獲取IP

?

1、注意復位PIN:

　　

2、SSP設置如下：

　　

3、測試：

#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); //方式一：阻塞的方式等待DHCPif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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_HOSTINGif (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); //方式二：查詢方式等待DHCP/* 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_HOSTINGif (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_HOSTINGif (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 notsend or receive packets with this IP address now. */status = nx_dhcp_release(client_ptr);if (status)error_counter++;else{ #ifdef SEMI_HOSTINGif (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk){/* Debugger is connected */printf("Released IP address back to Server.\n");} #endif}} #ifdef SEMI_HOSTINGif (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_HOSTINGif (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++; }

?

?

?

4、調試信息如下：

DHCP Client is running DHCP Client is assigned an IP address lease. DHCP Client address is 0xc0a81f7d. DHCP Client address is:192.168.31.125 DHCP Server IP address is 0c0a81f01. DHCP Server address is:192.168.31.1 Successfully 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.

?

?

　　

?

轉載于:https://www.cnblogs.com/jiangzhaowei/p/8949892.html

總結

以上是生活随笔為你收集整理的ETHNET DHCP的两种方式的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。