Dirk-Willem van Gulik (NXP/mbed)
/
AmpereMeter
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main.cpp
00001 #include "mbed.h" 00002 00003 #include "Servo.h" 00004 00005 #include "EthernetNetIf.h" 00006 #include "HTTPServer.h" 00007 00008 #include "mDNSResponder.h" 00009 00010 #include "RestMeterHandler.h" 00011 00012 00013 #define __DEBUG 00014 #include "dbg/dbg.h" 00015 00016 // Hardware I/O 00017 // 00018 Servo myservo(p21); 00019 DigitalOut netPoll(LED1); 00020 DigitalOut servoChange(LED2); 00021 00022 // Ethernet, webserver and Bonjour responder 00023 // 00024 EthernetNetIf eth; 00025 HTTPServer srv; 00026 mDNSResponder mdns; // make sure LWIP_IGMP is set in netCfg.h ! 00027 00028 #define MYNAME "Ampere Meter" // Human readable/descriptive name 00029 #define LUDN "amp-meter" // Local unqualified DNS name 00030 00031 #define RANGE 0.80 // scale of 0 .. 1 -- see Servo 00032 #define MIN 0.36 // scale of 0 .. 1 00033 #define STEP (RANGE / 20) 00034 00035 float pos = MIN + RANGE/2; 00036 00037 const char * restCallback(const char * cmd) 00038 { 00039 static char resp[2048]; 00040 00041 if (cmd && (!strcmp(cmd,"min"))) 00042 pos -= STEP; 00043 if (cmd && (!strcmp(cmd,"plus"))) 00044 pos += STEP; 00045 00046 if (pos > MIN+RANGE) pos = MIN + RANGE; 00047 if (pos < MIN) pos = MIN; 00048 00049 myservo = pos; 00050 servoChange = !servoChange; 00051 00052 snprintf(resp, sizeof(resp), 00053 "<head><title>%s</title></head>" 00054 "<body>" 00055 "<center><h1><hr/>%s<hr/></h1>", MYNAME, MYNAME); 00056 00057 // small HTML table to give a visual display 00058 // of the value as a VU style bar. 00059 snprintf(resp+strlen(resp), sizeof(resp)-strlen(resp), 00060 "<table cellpadding=2><tr>"); 00061 00062 for(int i = 0; i < 20; i++) 00063 snprintf(resp+strlen(resp), sizeof(resp)-strlen(resp), 00064 "<td bgcolor=%s width=10px height=10px> </td>", 00065 ((pos - MIN) * 20 / RANGE > i) ? "444444" : "dddddd"); 00066 00067 snprintf(resp+strlen(resp), sizeof(resp)-strlen(resp), 00068 "</tr><table><br>"); 00069 00070 // footer with the 2 plus/minus command options. 00071 // 00072 snprintf(resp+strlen(resp), sizeof(resp)-strlen(resp), 00073 "<a href='?cmd=min'><</a> <font size=+5>[%1.3f]</font> <a href='?cmd=plus'>></a>" 00074 "</center></body>", pos); 00075 00076 return resp; 00077 } 00078 00079 int main() { 00080 DBG("\n\r\n\r" 00081 "Compiled " MYNAME " (" LUDN ") on " __DATE__ " " __TIME__ 00082 "\r\n" 00083 ); 00084 netPoll = 0; 00085 00086 // middle the servo 00087 pos = MIN + RANGE/2; 00088 myservo = pos; 00089 00090 EthernetErr ethErr = eth.setup(); 00091 if (ethErr) { 00092 printf("Error %d in setup on DHCP.\r\n", ethErr); 00093 return -1; 00094 } 00095 00096 // for general static content. 00097 FSHandler::mount("/webfs", "/htdocs"); // Mount /webfs path on html docroot 00098 srv.addHandler<FSHandler>("/icons"); 00099 00100 // handling the commands/dynamic pages 00101 // 00102 RestMeterHandler::attach(&restCallback); 00103 srv.addHandler<RestMeterHandler>("/"); 00104 00105 // start the webserver 00106 srv.bind(80); 00107 00108 // Announce above web server - and keep doing that every minute or so. 00109 // 00110 mdns.announce( 00111 eth.getIp(), // (My) IP address - where announced service runs. 00112 LUDN, // DNS name server or service 00113 "_http._tcp", // protocol 00114 80, // Port number 00115 MYNAME, // User interface name service 00116 (char *[]) { // NULL terminated list of KV's = see 00117 "path=/", // http://www.zeroconf.org/Rendezvous/txtrecords.html 00118 NULL 00119 } 00120 ); 00121 00122 #if __DEEBUG 00123 Ip ip = eth.getIp(); 00124 DBG("Visible as http://" LUDN ".lcoal/ or http://%d.%d.%d.%d/\r\n", ip[0],ip[1],ip[2],ip[3]); 00125 #endif 00126 00127 netPoll = 1; 00128 unsigned char c = 0; 00129 while(true) { 00130 netPoll = ! netPoll; // flash net polling LED for geedback. 00131 Net::poll(); 00132 } 00133 } // main
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