Revision 1:3c8b9d709797, committed 2016-12-10

Comitter:

nyengele

Date:

Sat Dec 10 23:55:04 2016 +0000

Parent:

0:57cec3469a80

Commit message:

ESP8266 EXAMPLE

Changed in this revision

diff -r 57cec3469a80 -r 3c8b9d709797 main.cpp
--- a/main.cpp	Thu Oct 22 16:18:21 2015 +0000
+++ b/main.cpp	Sat Dec 10 23:55:04 2016 +0000
@@ -1,244 +1,107 @@
+/** 
+ * This example shows how the ESP8266 chip can work hand-in-hand with the mbed
+ * to effectively set up a dynamic web server.
+ * This example, however, does not implement a fully functional web server. 
+ * Instead, it just shows how to set up a serial link between the mbed and ESP module
+ * so that at every page request, the mbed provides the content to respond with.
+ * to extend on this example, one would need to be familiar with NodeMCU and LUA programming.
+ *
+ * Some links:
+ * http://frederickvandenbosch.be/?p=1629
+ * https://www.lua.org/pil/contents.html
+ * https://nodemcu.readthedocs.io/en/master/en/modules/uart/
+ * https://nodemcu.readthedocs.io/en/master/#nodemcu-documentation
+ */
+
 #include "mbed.h"
- 
+
 Serial pc(USBTX, USBRX);
-Serial esp(p28, p27); // tx, rx
+Serial esp(p28, p27);
 DigitalOut reset(p26);
-DigitalOut led1(LED1);
-DigitalOut led4(LED4);
 Timer t;
- 
-int  count,ended,timeout;
-char buf[2024];
-char snd[1024];
- 
-char ssid[32] = "SwagInABag";     // enter WiFi router ssid inside the quotes
-char pwd [32] = "yoloswag"; // enter WiFi router password inside the quotes
- 
-void SendCMD(),getreply(),ESPconfig(),ESPsetbaudrate();
- void dev_recv()
-{
-    led1 = !led1;
-    while(esp.readable()) {
-        pc.putc(esp.getc());
-    }
-}
- 
-void pc_recv()
-{
-    led4 = !led4;
-    while(pc.readable()) {
-        esp.putc(pc.getc());
-    }
-}
- 
- 
+char rx_buf[2048];
+volatile int index = 0;
+volatile int id = 48;
+
+void get_reply(int timeout);
+void esp_handler(void);
+
+char SSID[] = "net-name";
+char pswd[] = "net-password";
+
 int main()
 {
-    reset=0; //hardware reset for 8266
-    pc.baud(9600);  // set what you want here depending on your terminal program speed
-    pc.printf("\f\n\r-------------ESP8266 Hardware Reset-------------\n\r");
+    pc.baud(9600);
+    pc.printf("[mbed]\t: Resetting ESP device ... \n\r");
+    reset = 0;
     wait(0.5);
-    reset=1;
-    timeout=2;
-    getreply();
- 
-    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  ***********************
- 
- 
- 
-    pc.attach(&pc_recv, Serial::RxIrq);
-    esp.attach(&dev_recv, Serial::RxIrq);
-    
-    // continuosly get AP list and IP
-    while(1) {
-        sleep();
-    }
- 
-}
- 
-// 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()
-{
+    reset = 1;
+    esp.baud(9600);
+    get_reply(10);
+
+    pc.printf("\n\r[mbed]\t: Connecting to Wi-Fi network ... \n\r");
+    esp.printf("global_c = nil \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("wifi.setmode(wifi.STATION) \n\r"); get_reply(7); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("wifi.sta.config(\"%s\", \"d%s\") \n\r", SSID, pswd); get_reply(7); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("tmr.delay(1000000) \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("print(\"IP addr = \" .. wifi.sta.getip()) \n\r"); get_reply(15);
+    pc.printf("[esp]\t: %s \n\r", rx_buf);
 
-    wait(5);
-    pc.printf("\f---------- Starting ESP Config ----------\r\n\n");
-        strcpy(snd,".\r\n.\r\n");
-    SendCMD();
-        wait(1);
-    pc.printf("---------- Reset & get Firmware ----------\r\n");
-    strcpy(snd,"node.restart()\r\n");
-    SendCMD();
-    timeout=5;
-    getreply();
-    pc.printf(buf);
- 
-    wait(2);
- 
-    pc.printf("\n---------- Get Version ----------\r\n");
-    strcpy(snd,"print(node.info())\r\n");
-    SendCMD();
-    timeout=4;
-    getreply();
-    pc.printf(buf);
- 
-    wait(3);
- 
-    // set CWMODE to 1=Station,2=AP,3=BOTH, default mode 1 (Station)
-    pc.printf("\n---------- Setting Mode ----------\r\n");
-    strcpy(snd, "wifi.setmode(wifi.STATION)\r\n");
-    SendCMD();
-    timeout=4;
-    getreply();
-    pc.printf(buf);
- 
-    wait(2);
- 
+    pc.printf("\n\r[mbed]\t: Setting server up .. \n\r");
+    esp.printf("srv = net.createServer(net.TCP) \n\r"); get_reply(10); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("srv:listen(80, function(c) \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("if global_c ~= nil then global_c:close() end \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("global_c = c \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("c:on(\"receive\", function(sck, pl) \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("uart.write(0, \"REQUEST\") \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("end) end) \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+
+    pc.printf("\n\r[mbed]\t: setting up serial comm ... \n\r");   pc.printf("[esp]\t: %s \n\r", rx_buf);  
+    esp.printf("uart.setup(0, 9600, 8, 0, 1, 1) \n\r"); get_reply(10); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("uart.on(\"data\", 0, function(data) \n\r"); get_reply(10); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("if global_c ~= nil then \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("global_c:send(\"<html><h1>\" .. data .. \"</h1></html>\") \n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
+    esp.printf("global_c:close()\n\r end end, 0)\n\r"); get_reply(3); pc.printf("[esp]\t: %s \n\r", rx_buf);
    
- 
-    pc.printf("\n---------- Listing Access Points ----------\r\n");
-    strcpy(snd, "function listap(t)\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "for k,v in pairs(t) do\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "print(k..\" : \"..v)\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "end\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "end\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "wifi.sta.getap(listap)\r\n");
-    SendCMD();
-    wait(1);
-        timeout=15;
-    getreply();
-    pc.printf(buf);
- 
-    wait(2);
- 
-    pc.printf("\n---------- Connecting to AP ----------\r\n");
-    pc.printf("ssid = %s   pwd = %s\r\n",ssid,pwd);
-    strcpy(snd, "wifi.sta.config(\"");
-    strcat(snd, ssid);
-    strcat(snd, "\",\"");
-    strcat(snd, pwd);
-    strcat(snd, "\")\r\n");
-    SendCMD();
-    timeout=10;
-    getreply();
-    pc.printf(buf);
- 
-    wait(5);
- 
-    pc.printf("\n---------- Get IP's ----------\r\n");
-    strcpy(snd, "print(wifi.sta.getip())\r\n");
-    SendCMD();
-    timeout=3;
-    getreply();
-    pc.printf(buf);
- 
-    wait(1);
- 
-    pc.printf("\n---------- Get Connection Status ----------\r\n");
-    strcpy(snd, "print(wifi.sta.status())\r\n");
-    SendCMD();
-    timeout=5;
-    getreply();
-    pc.printf(buf);
- 
-    pc.printf("\n\n\n  If you get a valid (non zero) IP, ESP8266 has been set up.\r\n");
-    pc.printf("  Run this if you want to reconfig the ESP8266 at any time.\r\n");
-    pc.printf("  It saves the SSID and password settings internally\r\n");
-    wait(10);
-        
-        
-          pc.printf("\n---------- Setting up http server ----------\r\n");
-    strcpy(snd, "srv=net.createServer(net.TCP)\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "srv:listen(80,function(conn)\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "conn:on(\"receive\",function(conn,payload)\r\n");
-        SendCMD();
-        wait(1);
-        strcpy(snd, "print(payload)\r\n");
-        SendCMD();
-        wait(1);
-        
-        strcpy(snd, "conn:send(\"<!DOCTYPE html>\")\r\n");
-        SendCMD();
-      wait(1);
-        
-        strcpy(snd, "conn:send(\"<html>\")\r\n");
-        SendCMD();
-      wait(1);
-        
-        strcpy(snd, "conn:send(\"<h1> Hi James, NodeMcu.</h1>\")\r\n");
-      SendCMD();
-        wait(1);
-        
-        strcpy(snd, "conn:send(\"<h2> test</h2>\")\r\n");
-        SendCMD();
-        wait(1);
-        
-        strcpy(snd, "conn:send(\"</html>\")\r\n");
-    SendCMD();
-    wait(1);
-        
-        strcpy(snd, "end)\r\n");
-    SendCMD();
-    wait(1);
-        
-        strcpy(snd, "conn:on(\"sent\",function(conn) conn:close() end)\r\n");
-    SendCMD();
-    wait(1);
-        strcpy(snd, "end)\r\n");
-    SendCMD();
-    wait(1);
-        timeout=17;
-    getreply();
-    pc.printf(buf);
-        pc.printf("\r\nDONE");
+    
+    esp.printf("start_seq = 1 \n\r");
+    get_reply(10);
+    memset(rx_buf, '\0', sizeof(rx_buf));
+
+    esp.attach(&esp_handler, Serial::RxIrq);
+    pc.printf("\n\r[mbed]\t: READY \n\n\r");
+
+    while (1) { sleep(); }
+
 }
- 
-void SendCMD()
-{
-    esp.printf("%s", snd);
-}
- 
-void getreply()
+
+void get_reply(int timeout)
 {
-    memset(buf, '\0', sizeof(buf));
+    memset(rx_buf, '\0', sizeof(rx_buf));
     t.start();
-    ended=0;
-    count=0;
-    while(!ended) {
-        if(esp.readable()) {
-            buf[count] = esp.getc();
-            count++;
+    int ended = 0;
+    int count = 0;
+    while(!ended)
+    {
+        if (esp.readable())
+        {
+            rx_buf[count++] = esp.getc();
         }
         if(t.read() > timeout) {
             ended = 1;
             t.stop();
             t.reset();
         }
-    }
+    }   
 }
- 
-    
\ No newline at end of file
+
+void esp_handler(void)
+{
+    char c = esp.getc();
+    pc.putc(c);
+    if (c == '\0') pc.printf("\n\r");
+    esp.putc(id);
+    id++;
+    if (id == 58) id = 48;
+
+}