Revision 0:e58f27687450, committed 2014-12-16

Comitter:

quevedo

Date:

Tue Dec 16 01:08:47 2014 +0000

Child:

1:399414d48048

Commit message:

First version, only basic commands

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ESP8266.cpp	Tue Dec 16 01:08:47 2014 +0000
@@ -0,0 +1,90 @@
+#include "ESP8266.h"
+
+// Constructor
+ESP8266::ESP8266(PinName tx, PinName rx) : comm(tx, rx) {
+    comm.baud(115200);
+}
+
+// Destructor
+ESP8266::~ESP8266() { }
+
+// Add <CR> + <LF> at the end of the string
+void ESP8266::AddEOL(char * s) {
+    char k;
+    k = strlen(s); // Finds position of NULL character
+    s[k] = 0x0D; // switch NULL for <CR>
+    s[k + 1] = 0x0A; // Add <LF>
+    s[k + 2] = 0; // Add NULL at the end
+}
+
+// Add one ASCII character at the end of the string
+void ESP8266::AddChar(char * s, char c) {
+    char k;
+    k = strlen(s);
+    s[k] = c;
+    s[k + 1] = 0;
+}
+
+// Sends command to ESP8266. Receives the command string
+void ESP8266::SendCMD(char * s) {
+    AddEOL(s);
+    comm.printf("%s", s);
+}
+
+// Resets the ESP8266
+void ESP8266::Reset(void) {
+    char rs[10];
+    strcpy(rs, "AT+RST");
+    SendCMD(rs);
+}
+
+// Receive reply until no character is received after a given timeout in miliseconds
+void ESP8266::RcvReply(char * r, int to) {
+    Timer t;
+    bool ended = 0;
+    char c;
+    
+    strcpy(r, "");
+    t.start();
+    while(!ended) {
+        if(comm.readable()) {
+            c = comm.getc();
+            AddChar(r, c);
+            t.start();
+        }
+        if(t.read_ms() > to) {
+                ended = 1;
+        }
+    }
+    AddChar(r, 0x00);
+}
+
+// Gets the AP list. Parameter: the string to receive the list
+void ESP8266::GetList(char * l) {
+    char rs[15];
+    strcpy(rs, "AT+CWLAP");
+    SendCMD(rs);
+    RcvReply(l, 5000); // Needs big timeout because it takes long to start replying
+}
+
+// Joins a Wifi AP. Parameters: SSID and Password (strings)
+void ESP8266::Join(char * id, char * pwd) {
+    char cmd[255];
+    strcpy(cmd, "AT+CWJAP=");
+    AddChar(cmd, 0x22);
+    strcat(cmd, id);
+    AddChar(cmd, 0x22);
+    AddChar(cmd, 0x2C);
+    AddChar(cmd, 0x22);
+    strcat(cmd, pwd);
+    AddChar(cmd, 0x22);
+    SendCMD(cmd);
+}
+
+// Gets ESP IP. Parameter: string to contain IP
+void ESP8266::GetIP(char * ip) {
+    char cmd[15];
+    strcpy(cmd, "AT+CIFSR");
+    SendCMD(cmd);
+    RcvReply(ip, 2000);
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ESP8266.h	Tue Dec 16 01:08:47 2014 +0000
@@ -0,0 +1,58 @@
+#ifndef ESP8266_H
+#define ESP8266_H
+
+#include <string>
+#include "mbed.h"
+
+class ESP8266
+{
+public:
+/**
+  * ESP8266 constructor
+  *
+  * @param tx TX pin
+  * @param rx RX pin
+  */
+  ESP8266(PinName tx, PinName rx);
+
+  /**
+  * ESP8266 destructor
+  */
+  ~ESP8266();
+
+void SendCMD(char * s);
+void Reset(void);
+void RcvReply(char * r, int to);
+void GetList(char * l);
+void Join(char * id, char * pwd);
+void GetIP(char * ip);
+
+private:
+Serial comm;
+void AddEOL(char * s);
+void AddChar(char * s, char c);
+
+};
+  
+#endif
+/*
+    COMMAND TABLE
+    Basic:
+    AT: Just to generate "OK" reply
+    Wifi:
+    AT+RST:  restart the module
+    AT+CWMODE: define wifi mode; AT+CWMODE=<mode> 1= Sta, 2= AP, 3=both; Inquiry: AT+CWMODE? or AT+CWMODE=?
+    AT+CWJAP: join the AP wifi; AT+ CWJAP =<ssid>,< pwd > - ssid = ssid, pwd = wifi password, both between quotes; Inquiry: AT+ CWJAP?
+    AT+CWLAP: list the AP wifi
+    AT+CWQAP: quit the AP wifi; Inquiry: AT+CWQAP=?  
+    AT+CWSAP: set the parameters of AP; AT+CWSAP= <ssid>,<pwd>,<chl>,<ecn> - ssid, pwd, chl = channel, ecn = encryption; Inquiry: AT+CWJAP?
+    TCP/IP:
+    AT+CIPSTATUS: get the connection status
+    AT+CIPSTART: set up TCP or UDP connection 1)single connection (+CIPMUX=0) AT+CIPSTART= <type>,<addr>,<port>; 2) multiple connection (+CIPMUX=1) AT+CIPSTART= <id><type>,<addr>, <port> - id = 0-4, type = TCP/UDP, addr = IP address, port= port; Inquiry: AT+CIPSTART=?
+    AT+CIPSEND: send data; 1)single connection(+CIPMUX=0) AT+CIPSEND=<length>; 2) multiple connection (+CIPMUX=1) AT+CIPSEND= <id>,<length>; Inquiry: AT+CIPSEND=?
+    AT+CIPCLOSE: close TCP or UDP connection; AT+CIPCLOSE=<id> or AT+CIPCLOSE; Inquiry: AT+CIPCLOSE=?
+    AT+CIFSR: Get IP address; Inquiry: AT+ CIFSR=?
+    AT+CIPMUX:  set mutiple connection; AT+ CIPMUX=<mode> - 0 for single connection 1 for mutiple connection; Inquiry: AT+CIPMUX?
+    AT+CIPSERVER: set as server; AT+ CIPSERVER= <mode>[,<port> ] - mode 0 to close server mode, mode 1 to open; port = port; Inquiry: AT+CIFSR=?
+    +IPD: received data
+*/
\ No newline at end of file