Seeta Ram Pandey / ESP8266

IoT Based Smart Garbage Monitoring System- Seeta Ram, Avinash, Debjyoti

Dependents:   frdm_group2P1

ESP8266.cpp@0:e58f27687450, 2014-12-16 (annotated)

Committer:
quevedo
Date:
Tue Dec 16 01:08:47 2014 +0000
Revision:
0:e58f27687450
Child:
1:399414d48048
First version, only basic commands

Who changed what in which revision?

UserRevisionLine numberNew contents of line
quevedo 0:e58f27687450 1 #include "ESP8266.h"
quevedo 0:e58f27687450 2
quevedo 0:e58f27687450 3 // Constructor
quevedo 0:e58f27687450 4 ESP8266::ESP8266(PinName tx, PinName rx) : comm(tx, rx) {
quevedo 0:e58f27687450 5 comm.baud(115200);
quevedo 0:e58f27687450 6 }
quevedo 0:e58f27687450 7
quevedo 0:e58f27687450 8 // Destructor
quevedo 0:e58f27687450 9 ESP8266::~ESP8266() { }
quevedo 0:e58f27687450 10
quevedo 0:e58f27687450 11 // Add <CR> + <LF> at the end of the string
quevedo 0:e58f27687450 12 void ESP8266::AddEOL(char * s) {
quevedo 0:e58f27687450 13 char k;
quevedo 0:e58f27687450 14 k = strlen(s); // Finds position of NULL character
quevedo 0:e58f27687450 15 s[k] = 0x0D; // switch NULL for <CR>
quevedo 0:e58f27687450 16 s[k + 1] = 0x0A; // Add <LF>
quevedo 0:e58f27687450 17 s[k + 2] = 0; // Add NULL at the end
quevedo 0:e58f27687450 18 }
quevedo 0:e58f27687450 19
quevedo 0:e58f27687450 20 // Add one ASCII character at the end of the string
quevedo 0:e58f27687450 21 void ESP8266::AddChar(char * s, char c) {
quevedo 0:e58f27687450 22 char k;
quevedo 0:e58f27687450 23 k = strlen(s);
quevedo 0:e58f27687450 24 s[k] = c;
quevedo 0:e58f27687450 25 s[k + 1] = 0;
quevedo 0:e58f27687450 26 }
quevedo 0:e58f27687450 27
quevedo 0:e58f27687450 28 // Sends command to ESP8266. Receives the command string
quevedo 0:e58f27687450 29 void ESP8266::SendCMD(char * s) {
quevedo 0:e58f27687450 30 AddEOL(s);
quevedo 0:e58f27687450 31 comm.printf("%s", s);
quevedo 0:e58f27687450 32 }
quevedo 0:e58f27687450 33
quevedo 0:e58f27687450 34 // Resets the ESP8266
quevedo 0:e58f27687450 35 void ESP8266::Reset(void) {
quevedo 0:e58f27687450 36 char rs[10];
quevedo 0:e58f27687450 37 strcpy(rs, "AT+RST");
quevedo 0:e58f27687450 38 SendCMD(rs);
quevedo 0:e58f27687450 39 }
quevedo 0:e58f27687450 40
quevedo 0:e58f27687450 41 // Receive reply until no character is received after a given timeout in miliseconds
quevedo 0:e58f27687450 42 void ESP8266::RcvReply(char * r, int to) {
quevedo 0:e58f27687450 43 Timer t;
quevedo 0:e58f27687450 44 bool ended = 0;
quevedo 0:e58f27687450 45 char c;
quevedo 0:e58f27687450 46
quevedo 0:e58f27687450 47 strcpy(r, "");
quevedo 0:e58f27687450 48 t.start();
quevedo 0:e58f27687450 49 while(!ended) {
quevedo 0:e58f27687450 50 if(comm.readable()) {
quevedo 0:e58f27687450 51 c = comm.getc();
quevedo 0:e58f27687450 52 AddChar(r, c);
quevedo 0:e58f27687450 53 t.start();
quevedo 0:e58f27687450 54 }
quevedo 0:e58f27687450 55 if(t.read_ms() > to) {
quevedo 0:e58f27687450 56 ended = 1;
quevedo 0:e58f27687450 57 }
quevedo 0:e58f27687450 58 }
quevedo 0:e58f27687450 59 AddChar(r, 0x00);
quevedo 0:e58f27687450 60 }
quevedo 0:e58f27687450 61
quevedo 0:e58f27687450 62 // Gets the AP list. Parameter: the string to receive the list
quevedo 0:e58f27687450 63 void ESP8266::GetList(char * l) {
quevedo 0:e58f27687450 64 char rs[15];
quevedo 0:e58f27687450 65 strcpy(rs, "AT+CWLAP");
quevedo 0:e58f27687450 66 SendCMD(rs);
quevedo 0:e58f27687450 67 RcvReply(l, 5000); // Needs big timeout because it takes long to start replying
quevedo 0:e58f27687450 68 }
quevedo 0:e58f27687450 69
quevedo 0:e58f27687450 70 // Joins a Wifi AP. Parameters: SSID and Password (strings)
quevedo 0:e58f27687450 71 void ESP8266::Join(char * id, char * pwd) {
quevedo 0:e58f27687450 72 char cmd[255];
quevedo 0:e58f27687450 73 strcpy(cmd, "AT+CWJAP=");
quevedo 0:e58f27687450 74 AddChar(cmd, 0x22);
quevedo 0:e58f27687450 75 strcat(cmd, id);
quevedo 0:e58f27687450 76 AddChar(cmd, 0x22);
quevedo 0:e58f27687450 77 AddChar(cmd, 0x2C);
quevedo 0:e58f27687450 78 AddChar(cmd, 0x22);
quevedo 0:e58f27687450 79 strcat(cmd, pwd);
quevedo 0:e58f27687450 80 AddChar(cmd, 0x22);
quevedo 0:e58f27687450 81 SendCMD(cmd);
quevedo 0:e58f27687450 82 }
quevedo 0:e58f27687450 83
quevedo 0:e58f27687450 84 // Gets ESP IP. Parameter: string to contain IP
quevedo 0:e58f27687450 85 void ESP8266::GetIP(char * ip) {
quevedo 0:e58f27687450 86 char cmd[15];
quevedo 0:e58f27687450 87 strcpy(cmd, "AT+CIFSR");
quevedo 0:e58f27687450 88 SendCMD(cmd);
quevedo 0:e58f27687450 89 RcvReply(ip, 2000);
quevedo 0:e58f27687450 90 }