Simple configuration program for the ESP8266 Wi-Fi module. Includes baud rate changes. If module [Vendor:www.ai-thinker.com Version:0.9.2.4], the baud rate can be changed from 9600(default) to 230400. Other baud rates that did not work: 460800, 921600. These will set but could not get stable communications. No complicated libraries, once configured the module will store the settings ready to be used in the application. Can be reconfigured if required. Start with 9600, i.e. esp.baud(9600); If no response try esp.baud(57600); and esp.baud(115200); After config completes the program continuously gets AP and IP list.

Dependencies:   mbed

main.cpp

Committer:
star297
Date:
2015-02-10
Revision:
3:14e33fec26c3
Parent:
2:c5515c7eba46

File content as of revision 3:14e33fec26c3:

#include "mbed.h"

Serial pc(USBTX, USBRX);
Serial esp(PTE0, PTE1); // tx, rx 

Timer t;

int  count,ended,timeout;
char buf[1024];
char snd[255];

char ssid[32] = "ssid";     // enter router ssid inside the quotes
char pwd [32] = "password"; // enter router password inside the quotes

void SendCMD(),getreply(),ESPconfig(),ESPsetbaudrate();


int main() {
    
    pc.baud(115200);  // set what you want here depending on your terminal program speed
    esp.baud(9600);   // change this to the new ESP8266 baudrate if it is changed at any time.    
    
    //ESPsetbaudrate();   //******************  include this routine to set a different ESP8266 baudrate  ******************

    ESPconfig();        //******************  include Config to set the ESP8266 configuration  ***********************
    
   
   // contiuosly get AP list and IP
    while(1){
        pc.printf("\n---------- Listing Acces Points ----------\r\n");
        strcpy(snd, "AT+CWLAP\r\n");
        SendCMD();
        timeout=3;
        getreply();   
        pc.printf(buf);

        pc.printf("\n---------- Get IP's ----------\r\n"); 
        strcpy(snd, "AT+CIFSR\r\n");
        SendCMD();
        timeout=2;
        getreply(); 
        pc.printf(buf);
    }    
     
}

// Sets new ESP8266 baurate, change the esp.baud(xxxxx) to match your new setting once this has been executed
void ESPsetbaudrate()
{
    strcpy(snd, "AT+CIOBAUD=115200\r\n");   // change the numeric value to the required baudrate
    SendCMD();    
}    

//  +++++++++++++++++++++++++++++++++ This is for ESP8266 config only, run this once to set up the ESP8266 +++++++++++++++
void ESPconfig()
{

    pc.printf("---------- Starting ESP Config ----------\r\n\n");
    wait(2);
    pc.printf("---------- Reset & get Firmware ----------\r\n");
    strcpy(snd,"AT+RST\r\n");
    SendCMD();
    timeout=2;
    getreply();
    pc.printf(buf);
    
    wait(1);   
   
    pc.printf("\n---------- Get Version ----------\r\n");
    strcpy(snd,"AT+GMR\r\n");
    SendCMD();
    timeout=1;
    getreply();
    pc.printf(buf);    
    
    wait(1);
        
    // set CWMODE to 1=Station,2=AP,3=BOTH, default mode 1 (Station)
    pc.printf("\n---------- Setting Mode ----------\r\n");
    strcpy(snd, "AT+CWMODE=1\r\n");
    SendCMD();
    timeout=1;
    getreply();
    pc.printf(buf);
    
    wait(1);
    
    // set CIPMUX to 0=Single,1=Multi 
    pc.printf("\n---------- Setting Connection Mode ----------\r\n");
    strcpy(snd, "AT+CIPMUX=1\r\n"); 
    SendCMD();
    timeout=1;
    getreply();
    pc.printf(buf);
    
    wait(1);
    
    pc.printf("\n---------- Listing Acces Points ----------\r\n");
    strcpy(snd, "AT+CWLAP\r\n");
    SendCMD();
    timeout=3;
    getreply();   
    pc.printf(buf);
    
    wait(1);    
    
    pc.printf("\n---------- Connecting to AP ----------\r\n");
    pc.printf("ssid = %s   pwd = %s\r\n",ssid,pwd);
    strcpy(snd, "AT+CWJAP=\"");
    strcat(snd, ssid);
    strcat(snd, "\",\"");
    strcat(snd, pwd);
    strcat(snd, "\"\r\n");   
    SendCMD();
    timeout=8;
    getreply();    
    pc.printf(buf);
    
    wait(5);
    
    pc.printf("\n---------- Get IP's ----------\r\n"); 
    strcpy(snd, "AT+CIFSR\r\n");
    SendCMD();
    timeout=2;
    getreply(); 
    pc.printf(buf);
    
    wait(1);
    
    pc.printf("\n---------- Get Connection Status ----------\r\n"); 
    strcpy(snd, "AT+CIPSTATUS\r\n");
    SendCMD();
    timeout=2;
    getreply(); 
    pc.printf(buf);   
    
    pc.printf("\n\n\n  If you get a valid IP, ESP8266 has been set up.\r\n");
    pc.printf("  Run this if you want to reconfig the ESP8266 at any time.\r\n");
} 

void SendCMD()
{    
    esp.printf("%s", snd);    
} 

void getreply()
{    
    memset(buf, '\0', sizeof(buf));
    t.start();
    ended=0;count=0;
    while(!ended) {
        if(esp.readable()) {
            buf[count] = esp.getc();count++;
            }
        if(t.read() > timeout) {
                ended = 1;t.stop();t.reset();
            }
        }   
}