WIZnet / Mbed 2 deprecated TCP_LED_Control-WIZwiki-W7500

LED can be controlled by remote TCP client. This code was tested with WIZwiki-W7500 platform board.

Dependencies:   WIZnetInterface mbed

Fork of TCP_LED_Control-WIZwiki-W7500 by Kiyong Lee

WIZwiki-W7500 TCP LED Control Example

Overview

The WIZwiki board series has an Ethernet interface with an RJ-45 connector, so you can quickly implement various network applications. This example controls the on-board LED by sending the specified command string to the board with Ethernet - TCP data.

Prerequisite

The following items are required to implement this example project.

  • Mandatory
  • Optional
    • Ethernet Hub or Router (supports DHCP IP allocation)

Information

If there is no Ethernet hub or router, you can connect PC and device directly with LAN cable.

Hardware Configuration

WIZwiki-W7500 Pinout

Pinout

On-board LED

The on-board LED (red) used to verify the transmission of TCP data is connected to the PC_08 pin and is declared as LED1 in the mbed library.

Network Configuration

/media/uploads/hkjung/tcp_loopback_system_config.jpg

Firmware

Command String

The following three command strings are implemented in this example project.

  • LED_ON
  • LED_OFF
  • LED_BLINK

Network Settings

MAC address

For Ethernet networking, each network device must have its own unique hardware address. that hardware address is called MAC address, and typically the MAC address is represented by six bytes hex separated by a colon. e.g., 00:08:DC:XX:XX:XX

The MAC address is defined in the code as follows.

main.cpp

#define MAC     "\x00\x08\xDC\x55\x51\x52"

IP address allocation method

Use Static IP address

The 'Static IP address' setting is the default value, and the device is configured with the network information defined in the code. It can be used when connecting the device directly to the PC or through an Ethernet hub. The IP address of the PC should be set to the same ip address range as the device.

The network information is defined in the code as follows.

main.cpp

#define IP      "192.168.0.20"   // IP address
#define SUBNET  "255.255.255.0"  // Subnet Mask
#define GATEWAY "192.168.0.1"    // Gateway address

The following is an example of the PC's network settings that can connect with the device's settings.

PC's network setting example
IP address192.168.0.21
Subnet Mask255.255.255.0
Gateway address192.168.0.1
Use DHCP

Routers that support DHCP automatically assign a leased range of IP addresses to each connected devices. If your PC is connected to a router, uncomment the following define and the device will be automatically assigned network information.

main.cpp

#define USE_DHCP

The network information assigned by the router can be checked through the debug messages output to the serial terminal.

Building and Running an Example

Steps

1. Import this project into your mbed compiler.

2. View the default program source code and modify what you need.

  • Network settings and so on.

3. Compile and Download the Program.

  • To compile the program, click the Compile button in the toolbar. This will compile all the program source code files within the program folder to create a binary program.
  • After a successful compile, you will get a "Success!" message in the compiler output and the download dialog will pop up. Save it to the location of the mbed Microcontroller drive, and then hit reset on the microcontroller to start it running!

4. Run the serial terminal program and check the messages.

/media/uploads/hkjung/serial_debug_wizwiki-w7500.png

  • Device's network settings and supported command strings.
  • Default UART baudrate: 115200bps

5. Run the TCP client terminal program and Connect to your device.

/media/uploads/hkjung/tcp_client_connect_wizwiki-w7500.png

6. Send command to your device and check status of LED and serial messages

/media/uploads/hkjung/tcp_client_wizwiki-w7500.png

/media/uploads/hkjung/serial_debug_cmd_wizwiki-w7500.png

Files at this revision

API Documentation at this revision

Revision 14:3ecd0c9dfa6b, committed 2017-04-11

Comitter:
hkjung
Date:
Tue Apr 11 05:24:40 2017 +0000
Parent:
13:31f4ecf83cca
Child:
15:3e15e08ff603
Commit message:
Code modified / mbed and ethernet library updated

Changed in this revision

WIZnetInterface.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file 
--- a/WIZnetInterface.lib	Mon Jul 27 01:31:48 2015 +0000
+++ b/WIZnetInterface.lib	Tue Apr 11 05:24:40 2017 +0000
@@ -1,1 +1,1 @@
-http://developer.mbed.org/teams/WIZnet/code/WIZnetInterface/#24a9f2df2145
+http://developer.mbed.org/teams/WIZnet/code/WIZnetInterface/#c91884bd2713

--- a/main.cpp	Mon Jul 27 01:31:48 2015 +0000
+++ b/main.cpp	Tue Apr 11 05:24:40 2017 +0000
@@ -1,23 +1,50 @@
 #include "mbed.h"
 #include "EthernetInterface.h"
 
-#define ECHO_SERVER_PORT   7
+#define MAC     "\x00\x08\xDC\x55\x51\x52"
+#define IP      "192.168.0.20"
+#define SUBNET  "255.255.255.0"
+#define GATEWAY "192.168.0.1"
+
+#define ECHO_SERVER_PORT    5000
+
+//#define USE_DHCP
+
+#define FLAG_LED_ON         2
+#define FLAG_LED_OFF        1
+#define FLAG_INVALID_CMD    0
+
+#define LED_ON              0
+#define LED_OFF             1
 
 DigitalOut myled(LED1);
 
-int compare_strings(char [], char []); 
+ // LED control if received message matches pre-defined commands
+char cmd_ledon[] = {'L', 'E', 'D', '_', 'O', 'N', '\0'};
+char cmd_ledoff[] = {'L', 'E', 'D', '_', 'O', 'F', 'F', '\0'};
 
 int main (void) 
 {
-    myled = 1; // LED OFF in WIZwiki-W7500
-    int flag=1;
+    myled = LED_OFF; // LED OFF in WIZwiki-W7500
+    int flag;
 
-    printf("Wait a second...\r\n");
-    uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x55, 0x51, 0x52}; 
+    printf("Wait a second...\r\n\r\n");
+        
     EthernetInterface eth;
-    eth.init(mac_addr); //Use DHCP
+    
+#ifdef USE_DHCP
+    eth.init(MAC); // Use DHCP
+#else
+    eth.init((uint8_t*)MAC, IP, SUBNET, GATEWAY); // Use Static IP address
+#endif
+    
     eth.connect();
-    printf("Server IP Address is %s\r\n", eth.getIPAddress());
+    
+    printf("Server IP Address is %s : %d\r\n", eth.getIPAddress(), ECHO_SERVER_PORT);
+    
+    printf("Command #1: %s\r\n", cmd_ledon);
+    printf("Command #2: %s\r\n", cmd_ledoff);
+    printf("\r\n");
     
     TCPSocketServer server;
     server.bind(ECHO_SERVER_PORT);
@@ -31,43 +58,56 @@
         client.set_blocking(false, 15000); // Timeout after (1.5)s
         
         printf("Connection from: %s\r\n", client.get_address());
+        printf("\r\n");
+        
         char buffer[256];
         while (true) {
             int n = client.receive(buffer, sizeof(buffer));
             if (n <= 0) break;
             
-            // print received message to terminal
+            // Print received message to terminal
             buffer[n] = '\0';
-            printf("Received message from Client :'%s'\r\n",buffer);
-    
-            // LED control if received message matches pre-defined command
-            char command_buf[256] = {'L', 'E', 'D', '_', 'O', 'N', '\0'};
-
-            char string[256];
-            strcpy (string, command_buf);
-            printf("Received command : %s\n", string);
-
-            flag = compare_strings(buffer, command_buf);
-            
-            if (flag == 0) {
-              myled = 0; // LED ON in WIZwiki-W7500
-              printf("LED is turned on!\r\n");
-            }
-            else {
-              myled = 1;
-              printf("LED is turned off!\r\n");
+            printf("Received message from Client :'%s'\r\n",buffer);           
+           
+            // Compares the received string to predefined commands
+            if(strncmp(buffer, cmd_ledon, sizeof(buffer)) == 0) {
+                flag = FLAG_LED_ON;
+            } else if(strncmp(buffer, cmd_ledoff, sizeof(buffer)) == 0) {
+                flag = FLAG_LED_OFF;
+            } else {
+                flag = FLAG_INVALID_CMD;    
             }
             
-            // reverse the message
+            // LED On/Off or Invalid command
+            switch(flag)
+            {
+                case FLAG_LED_ON:
+                    myled = LED_ON; // LED ON in WIZwiki-W7500
+                    printf("WIZwiki: LED is turned on!\r\n");
+                    break;
+                    
+                case FLAG_LED_OFF:
+                    myled = LED_OFF;
+                    printf("WIZwiki: LED is turned off!\r\n");
+                    break;
+                    
+                case FLAG_INVALID_CMD:
+                default:                    
+                    printf("WIZwiki: Invalid command\r\n");
+                    break;
+            }
+            
+            // Reverse the message
             char temp;
             for(int f = 0, l = n-1; f<l; f++,l--){
                 temp = buffer[f];
                 buffer[f] = buffer[l];
                 buffer[l] = temp;
-                }
+            }
             
-            // print reversed message to terminal
-            printf("Sending message to Client: '%s'\r\n",buffer);
+            // Print reversed message to terminal
+            printf("Sending reversed message to Client: '%s'\r\n", buffer);
+            printf("\r\n");
             
             // Echo received message back to client
             client.send_all(buffer, n);
@@ -75,22 +115,5 @@
         }
         
         client.close();
-    }
-    
-}
-
-int compare_strings(char a[], char b[])
-{
-   int c = 0;
- 
-   while (a[c] == b[c]) {
-      if (a[c] == '\0' || b[c] == '\0')
-         break;
-      c++;
-   }
- 
-   if (a[c] == '\0' && b[c] == '\0')
-      return 0;
-   else
-      return -1;
-}
+    }    
+}
\ No newline at end of file

--- a/mbed.bld	Mon Jul 27 01:31:48 2015 +0000
+++ b/mbed.bld	Tue Apr 11 05:24:40 2017 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/7cff1c4259d7
\ No newline at end of file
+https://mbed.org/users/mbed_official/code/mbed/builds/856d2700e60b
\ No newline at end of file