Austin Dong
For Adafruit HUZZAH ESP8266 Wi Fi chip on the mbed LPC1768. Sets up a web page server that can control a mbed onboard LEDs. Need to configure Wi Fi SSID and PASSWORD first with another program (one time only). See https://developer.mbed.org/users/ausdong/notebook/using-the-adafruit-huzzah-esp8266-to-add-wi-fi-to-/ .
Fork of
ESP8266-WEB-Mbed-LPC1768-Controller
by 
jim hamblen
main.cpp
- Committer:
- star297
- Date:
- 2015-02-19
- Revision:
- 2:d4c6bc0f2dc4
- Parent:
- 1:71ed1afbf344
- Child:
- 3:f7febfa77784
File content as of revision 2:d4c6bc0f2dc4:
// ESP8266 Static page WEB server to control Mbed
#include "mbed.h"
#include "DS18B20.h"
Serial pc(USBTX, USBRX);
Serial esp(PTE0, PTE1); // tx, rx
DS18B20 thermom(A0, DS18B20::RES_12_BIT);
// Standard Mbed LED definitions
DigitalOut led1(LED_RED); // (PTB18)
DigitalOut led2(LED_GREEN); // (PTB19)
DigitalOut led3(LED_BLUE); // (PTD1)
// Digital Out and In pins, can be configured to any suitable pin depending on Platform
DigitalOut Out1(D7);
DigitalOut Out2(D8);
DigitalOut Out3(D4);
DigitalIn In1(A2);
DigitalIn In2(A3);
DigitalIn In3(A4);
PwmOut speaker(D5);
AnalogIn BATin(A1);
Timer t1;
Timer t2;
struct tm t;
int buflen, DataRX, count, getcount, ended, servreq, timeout;
int bufl, ipdLen, linkID, weberror, webcounter;
float temperature, AdcIn, Ht;
float R1=100000, R2=10000; // resistor values to give a 10:1 reduction of measured AnalogIn voltage
char Vcc[10];
char Temp[10];
char temp[10];
char webcount[8];
char lasthit[60];
char timebuf[30];
char type[16];
char type1[16];
char channel[2];
char snd[256];
char webdata[1024]; // This may need to be bigger depending on WEB browser used
char buf[4096]; // Currently using 1407 characters, Increase this if more web page data added
void SendCMD(),getreply(),ReadWebData(),startserver(),sendpage(),SendWEB(),sendcheck();
void gettime(),gettemp(),getbattery(),setRTC(),beep();
// manual set RTC values
int minute =13; // 0-59
int hour =15; // 2-23
int dayofmonth =19; // 1-31
int month =2; // 1-12
int year =15; // last 2 digits
int port =90; // set server port
// Serial Interrupt read ESP data
void callback() {
while (esp.readable()) {buf[count] = esp.getc();count++;}
if(strlen(buf)>buflen){DataRX=1;}
}
int main() {
led1=1,led2=1,led3=1;
pc.baud(115200);
esp.baud(115200); // ESP8266 baudrate.
if (time(NULL) < 1420070400) {setRTC();}
beep();
startserver();
while(1){
if(DataRX==1){
ReadWebData();
beep();
if (servreq == 1 && weberror == 0){sendpage();}
pc.printf(" IPD Data:\r\n\n Link ID = %d,\r\n IPD Header Length = %d \r\n IPD Type = %s\r\n", linkID, ipdLen, type);
pc.printf("\n\n HTTP Packet: \n\n%s\n", webdata);
pc.printf(" Web Characters sent : %d\n\n", bufl);
pc.printf(" -------------------------------------\n\n");
esp.attach(&callback);
strcpy(lasthit, timebuf);
servreq=0;
}
if(t2.read()>900){startserver();} // restart server every 15 minutes after no activity in case of ESP lock out.
}
}
// Static WEB page
void sendpage()
{
gettemp();getbattery();gettime();
memset(buf, '\0', sizeof(buf));
// WEB page data
strcpy(buf, "<!DOCTYPE html>");
strcat(buf, "<html><head><title>ESP8266 Mbed</title></head>");
strcat(buf, "<body>");
strcat(buf, "<div style=\"text-align:center; background-color:#F4F4F4; color:#00AEDB;\"><h1>ESP8266 Mbed Web Controller</h1>");
strcat(buf, "Hit Count - ");
strcat(buf, webcount);
strcat(buf, "<br>Last Hit - ");
strcat(buf, lasthit);
strcat(buf, "</div><br /><hr>");
strcat(buf, "<h3>Mbed RTC Time - ");
strcat(buf, timebuf);
strcat(buf, "</h3>\r\n");
strcat(buf, "<p><form method=\"POST\"><strong> Temperature: <input type=\"text\" size=6 value=\"");
strcat(buf, Temp);
strcat(buf, "\"> <sup>O</sup>C <form method=\"POST\"> <strong> Battery: <input type=\"text\" size=4 value=\"");
strcat(buf, Vcc);
strcat(buf, "\"> </sup>V");
if(led1==1){strcat(buf, "<p><input type=\"radio\" name=\"led1\" value=\"0\" checked> Red LED off");
strcat(buf, "<br><input type=\"radio\" name=\"led1\" value=\"1\" > Red LED on");}
else{strcat(buf, "<p><input type=\"radio\" name=\"led1\" value=\"0\" > Red LED off");
strcat(buf, "<br><input type=\"radio\" name=\"led1\" value=\"1\" checked> Red LED on");}
if(Out1==0){strcat(buf, "<p><input type=\"radio\" name=\"Out1\" value=\"0\" checked> Digital Out 1 off");
strcat(buf, "<br><input type=\"radio\" name=\"Out1\" value=\"1\" > Digital Out 1 on");}
else{strcat(buf, "<p><input type=\"radio\" name=\"Out1\" value=\"0\" > Digital Out 1 off");
strcat(buf, "<br><input type=\"radio\" name=\"Out1\" value=\"1\" checked> Digital Out 1 on");}
if(Out2==0){strcat(buf, "<p><input type=\"radio\" name=\"Out2\" value=\"0\" checked> Digital Out 2 off");
strcat(buf, "<br><input type=\"radio\" name=\"Out2\" value=\"1\" > Digital Out 2 on");}
else{strcat(buf, "<p><input type=\"radio\" name=\"Out2\" value=\"0\" > Digital Out 2 off");
strcat(buf, "<br><input type=\"radio\" name=\"Out2\" value=\"1\" checked> Digital Out 2 on");}
if(Out3==0){strcat(buf, "<p><input type=\"radio\" name=\"Out3\" value=\"0\" checked> Digital Out 3 off");
strcat(buf, "<br><input type=\"radio\" name=\"Out3\" value=\"1\" > Digital Out 3 on");}
else{strcat(buf, "<p><input type=\"radio\" name=\"Out3\" value=\"0\" > Digital Out 3 off");
strcat(buf, "<br><input type=\"radio\" name=\"Out3\" value=\"1\" checked> Digital Out 3 on");}
if(In1==0){strcat(buf, "<p><input type=\"radio\" name=\"In1\" value=\"0\" > Digital In 1");}
else{strcat(buf, "<p><input type=\"radio\" name=\"In1\" value=\"1\" checked> Digital In 1");}
if(In2==0){strcat(buf, "<br><input type=\"radio\" name=\"In2\" value=\"0\" > Digital In 2");}
else{strcat(buf, "<br><input type=\"radio\" name=\"In2\" value=\"1\" checked> Digital In 2");}
if(In3==0){strcat(buf, "<br><input type=\"radio\" name=\"In3\" value=\"0\" > Digital In 3");}
else{strcat(buf, "<br><input type=\"radio\" name=\"In3\" value=\"1\" checked> Digital In 3");}
strcat(buf, "</strong><p><input type=\"submit\" value=\"send-refresh\" style=\"background: #3498db;");
strcat(buf, "background-image:-webkit-linear-gradient(top, #3498db, #2980b9);");
strcat(buf, "background-image:linear-gradient(to bottom, #3498db, #2980b9);");
strcat(buf, "-webkit-border-radius:12;border-radius: 12px;font-family: Arial;color:#ffffff;font-size:20px;padding:");
strcat(buf, "10px 20px 10px 20px; border:solid #103c57 3px;text-decoration: none;");
strcat(buf, "background: #3cb0fd;");
strcat(buf, "background-image:-webkit-linear-gradient(top,#3cb0fd,#1a5f8a);");
strcat(buf, "background-image:linear-gradient(to bottom,#3cb0fd,#1a5f8a);");
strcat(buf, "text-decoration:none;\"></form></span>");
strcat(buf, "<p/><h2>How to use:</h2><ul>");
strcat(buf, "<li>Select the Radio buttons to control the digital out pins.</li>");
strcat(buf, "<li>Click 'Send-Refresh' to send.</li>");
strcat(buf, "<li>Use the 'Send-Refresh' button to refresh the data.</li>");
strcat(buf, "</ul>");
strcat(buf, "</body></html>");
// end of WEB page data
bufl = strlen(buf); // get total page buffer length
sprintf(snd,"AT+CIPSEND=%s,%d\r\n", channel, bufl); // send IPD link channel and buffer character length.
SendCMD();
wait_ms(100);
SendWEB(); // send web page
memset(buf, '\0', sizeof(buf));
sendcheck();
}
// wait for ESP "SEND OK" reply, then close IP to load web page, if lock out, system fully restarts
void sendcheck()
{
timeout=200;
weberror=1;t2.reset();t2.start();
while(weberror==1 && t2.read() <10){
getreply();
if (strstr(buf, "SEND OK") != NULL) {weberror=0;} // wait for valid SEND OK
}
t2.reset();
if(weberror==1){
pc.printf("\n\n\n ++++++++++ WEB Connect Error, restarting ... ++++++++++\n\n");
NVIC_SystemReset();}
strcpy(snd, "AT+CIPCLOSE=0\r\n");
SendCMD();
}
// Reads and processes GET and POST web data
void ReadWebData()
{
wait_ms(200);
led3=0;
count=0;DataRX=0;weberror=0;
esp.attach(NULL);
int x = strcspn (buf,"+");
if(x){
strcpy(webdata, buf + x);weberror=0;
int numMatched = sscanf(webdata,"+IPD,%d,%d:%s", &linkID, &ipdLen, type);
if( strstr(webdata, "led1=1") != NULL ) {led1=0;}
if( strstr(webdata, "led1=0") != NULL ) {led1=1;}
if( strstr(webdata, "Out1=1") != NULL ) {Out1=1;}
if( strstr(webdata, "Out1=0") != NULL ) {Out1=0;}
if( strstr(webdata, "Out2=1") != NULL ) {Out2=1;}
if( strstr(webdata, "Out2=0") != NULL ) {Out2=0;}
if( strstr(webdata, "Out3=1") != NULL ) {Out3=1;}
if( strstr(webdata, "Out3=0") != NULL ) {Out3=0;}
sprintf(channel, "%d",linkID);
if (strstr(webdata, "GET") != NULL) {servreq=1;}
if (strstr(webdata, "POST") != NULL) {servreq=1;}
webcounter++;
sprintf(webcount, "%d",webcounter);
}
else {strcpy(webdata, buf);weberror=1;}
led3=1;
}
// Starts and restarts webserver if errors detected.
void startserver()
{
esp.attach(NULL);
wait(1);
gettime();
pc.printf("\n\n RTC time %s\r\n\n",timebuf);
pc.printf("++++++++++ Resetting ESP ++++++++++\r\n");
strcpy(snd,"AT+RST\r\n");
SendCMD();
timeout=2000;getcount=336;
getreply();
if (strstr(buf, "ready") != NULL) {
pc.printf("\n++++++++++ Starting Server ++++++++++\r\n");
strcpy(snd, "AT+CIPMUX=1\r\n"); // set multiple connections.
SendCMD();
timeout=500;getcount=10;
getreply();
strcpy(snd, "AT+CIPSERVER=1,90\r\n");
//sprintf(snd,"AT+CIPSERVER=1,%d\r\n", port);
SendCMD();
timeout=500;getcount=10;
getreply();
pc.printf("\n Getting Server IP \r\n");
strcpy(snd, "AT+CIFSR\r\n");
timeout=1000;getcount=50;
while(weberror==0){
SendCMD();getreply();
if (strstr(buf, "0.0.0.0") == NULL) {weberror=1;} // wait for valid IP
}
pc.printf("\n Enter WEB address in your browser \r\n\n");
buf[strlen(buf) - 8] = '\0';
char* IP = buf + 5;
sprintf(snd," http://%s:%d", IP, port);
pc.printf(snd);
while (esp.readable()){esp.getc();}
buflen=200;count=0;
memset(buf, '\0', sizeof(buf));
led2=0;wait(2);led2=1;
pc.printf("\n\n++++++++++ Ready ++++++++++\r\n\n");
esp.attach(&callback);
}
else{
pc.printf("\n++++++++++ ESP8266 error, check power/connections ++++++++++\r\n");
while(1){}
}
t2.reset();t2.start();beep();
}
// ESP Command data send
void SendCMD()
{
esp.printf("%s", snd);
}
// Large WEB buffer data send
void SendWEB()
{
int i=0;
if(esp.writeable()) {
while(buf[i]!='\0') {esp.putc(buf[i]);i++;}
}
}
// Get Cammand and ESP status replies
void getreply()
{
memset(buf, '\0', sizeof(buf));
t1.reset(); t1.start();
ended=0;count=0;
while(t1.read_ms()< timeout && count < getcount) {
if(esp.readable()) {
buf[count] = esp.getc();count++;
}
}
t1.stop();
}
// Analog in example
void getbattery()
{
AdcIn=BATin.read();
Ht = (AdcIn*3.328f*(R1+R2)/R2); // set the numeric to the exact MCU analog reference voltage for greater accuracy
sprintf(Vcc,"%2.3f",Ht);
}
// Temperature example
void gettemp()
{
temperature=thermom.GetTemperature(); // comment this out if no sensor connected
//temperature = 21.357; // include for dummy value
sprintf(Temp,"%3.3f",temperature);
}
// Get RTC time
void gettime()
{
time_t seconds = time(NULL);
strftime(timebuf,50,"%H:%M:%S %a %d %b %y", localtime(&seconds));
}
void beep()
{
speaker.period(1.0/2000); // 2000hz period
speaker = 0.5; //50% duty cycle - max volume
wait_ms(60);
speaker=0.0; // turn off audio
}
void setRTC()
{
t.tm_sec = (0); // 0-59
t.tm_min = (minute); // 0-59
t.tm_hour = (hour); // 0-23
t.tm_mday = (dayofmonth); // 1-31
t.tm_mon = (month-1); // 0-11 "0" = Jan, -1 added for Mbed RCT clock format
t.tm_year = ((year)+100); // year since 1900, current DCF year + 100 + 1900 = correct year
set_time(mktime(&t)); // set RTC clock
}