Diff: main.cpp

Revision:

0:c301ccc87f5b

Child:

2:9a54ede37c7e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Aug 17 15:36:07 2017 +0000
@@ -0,0 +1,249 @@
+#include "mbed.h"
+#include "wifi.h"
+/*------------------------------------------------------------------------------
+Hyperterminal settings: 115200 bauds, 8-bit data, no parity
+
+This example 
+  - connects to a wifi network (SSID & PWD to set in mbed_app.json)
+  - displays the IP address and creates a web page
+  - then connect on its IP address on the same wifi network with another device
+  - Now able to change the led status and read the temperature
+
+This example uses SPI3 ( PE_0 PC_10 PC_12 PC_11), wifi_wakeup pin (PB_13), 
+wifi_dataready pin (PE_1), wifi reset pin (PE_8)
+------------------------------------------------------------------------------*/
+
+/* Private defines -----------------------------------------------------------*/
+#define WIFI_WRITE_TIMEOUT 10000
+#define WIFI_READ_TIMEOUT  10000
+#define PORT           80
+
+/* Private typedef------------------------------------------------------------*/
+typedef enum
+{
+  WS_IDLE = 0,
+  WS_CONNECTED,
+  WS_DISCONNECTED,
+  WS_ERROR,
+} WebServerState_t;
+
+/* Private macro -------------------------------------------------------------*/
+static int wifi_sample_run(void);
+static void WebServerProcess(void);
+static WIFI_Status_t SendWebPage(uint8_t ledIsOn, float temperature);
+/* Private variables ---------------------------------------------------------*/
+Serial pc(SERIAL_TX, SERIAL_RX);
+static   uint8_t http[1024];
+static   uint8_t resp[1024];
+uint16_t respLen;
+uint8_t  IP_Addr[4]; 
+uint8_t  MAC_Addr[6]; 
+int32_t Socket = -1;
+static   WebServerState_t  State = WS_ERROR;
+char     ModuleName[32];
+DigitalOut led(LED2);
+AnalogIn adc_temp(ADC_TEMP);
+
+int main()
+{
+    int ret = 0;
+    led = 0;
+    pc.baud(115200);
+    printf("\n");
+    printf("************************************************************\n");
+    printf("***   STM32 IoT Discovery kit for STM32L475 MCU          ***\n");
+    printf("***         WIFI Web Server demonstration                ***\n\n");
+    printf("*** Copy the IP address on another device connected      ***\n");
+    printf("*** to the wifi network                                  ***\n");
+    printf("*** Read the temperature and update the LED status       ***\n");
+    printf("************************************************************\n");
+    
+    /* Working application */
+    ret = wifi_sample_run();
+    
+    if (ret != 0) {
+        return -1;
+    }
+
+    
+    while(1) {
+        WebServerProcess ();
+    }
+
+}
+
+
+int wifi_sample_run(void)
+{
+  
+    /*Initialize and use WIFI module */
+    if(WIFI_Init() ==  WIFI_STATUS_OK) {
+        printf("ES-WIFI Initialized.\n");
+    
+        if(WIFI_GetMAC_Address(MAC_Addr) == WIFI_STATUS_OK) {       
+            printf("> es-wifi module MAC Address : %X:%X:%X:%X:%X:%X\n",     
+                   MAC_Addr[0],
+                   MAC_Addr[1],
+                   MAC_Addr[2],
+                   MAC_Addr[3],
+                   MAC_Addr[4],
+                   MAC_Addr[5]);   
+        } else {
+            printf("> ERROR : CANNOT get MAC address\n");
+        }
+    
+        if( WIFI_Connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, WIFI_ECN_WPA2_PSK) == WIFI_STATUS_OK) {
+            printf("> es-wifi module connected \n");
+      
+            if(WIFI_GetIP_Address(IP_Addr) == WIFI_STATUS_OK) {
+                printf("> es-wifi module got IP Address : %d.%d.%d.%d\n",     
+                       IP_Addr[0],
+                       IP_Addr[1],
+                       IP_Addr[2],
+                       IP_Addr[3]); 
+        
+                printf(">Start HTTP Server... \n");
+                printf(">Wait for connection...  \n");
+                State = WS_IDLE;
+            } else {    
+                printf("> ERROR : es-wifi module CANNOT get IP address\n");
+                return -1;
+            }
+        } else {
+            printf("> ERROR : es-wifi module NOT connected\n");
+            return -1;
+        }
+    } else {
+        printf("> ERROR : WIFI Module cannot be initialized.\n"); 
+        return -1;
+    }
+    return 0;
+}
+
+/**
+  * @brief  Send HTML page
+  * @param  None
+  * @retval None
+  */
+static void WebServerProcess(void)
+{
+  uint8_t LedState = 0;
+  float temp;
+  switch(State)
+  {
+  case WS_IDLE:
+    Socket = 0;
+    WIFI_StartServer(Socket, WIFI_TCP_PROTOCOL, "", PORT);
+    
+    if(Socket != -1)
+    {
+      printf("> HTTP Server Started \n");  
+      State = WS_CONNECTED;
+    }
+    else
+    {
+      printf("> ERROR : Connection cannot be established.\n"); 
+      State = WS_ERROR;
+    }    
+    break;
+    
+  case WS_CONNECTED:
+    
+    WIFI_ReceiveData(Socket, resp, 1200, &respLen, WIFI_READ_TIMEOUT);
+    
+    if( respLen > 0)
+    {
+      if(strstr((char *)resp, "GET")) /* GET: put web page */
+      {
+        temp = (adc_temp.read()*100);
+        if(SendWebPage(LedState, temp) != WIFI_STATUS_OK)
+        {
+          printf("> ERROR : Cannot send web page\n");
+          State = WS_ERROR;
+        }
+      }
+      else if(strstr((char *)resp, "POST"))/* POST: received info */
+      {
+          if(strstr((char *)resp, "radio"))
+          {          
+            if(strstr((char *)resp, "radio=0"))
+            {
+              LedState = 0;
+              led = 0;
+            }
+            else if(strstr((char *)resp, "radio=1"))
+            {
+              LedState = 1;
+              led = 1;
+            } 
+            
+           temp = (adc_temp.read()*100);
+            if(SendWebPage(LedState, temp) != WIFI_STATUS_OK)
+            {
+              printf("> ERROR : Cannot send web page\n");
+              State = WS_ERROR;
+          }
+        }
+      }
+    }
+    if(WIFI_StopServer(Socket) == WIFI_STATUS_OK)
+    {
+      WIFI_StartServer(Socket, WIFI_TCP_PROTOCOL, "", PORT);
+    }
+    else
+    {
+      State = WS_ERROR;  
+    }
+    break;
+  case WS_ERROR:   
+  default:
+    break;
+  }
+}
+
+
+/**
+  * @brief  Send HTML page
+  * @param  None
+  * @retval None
+  */
+static WIFI_Status_t SendWebPage(uint8_t ledIsOn, float temperature)
+{
+  uint8_t  temp[50];
+  uint16_t SentDataLength;
+  WIFI_Status_t ret;
+  
+  /* construct web page content */
+  strcpy((char *)http, (char *)"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\nPragma: no-cache\r\n\r\n");
+  strcat((char *)http, (char *)"<html>\r\n<body>\r\n");
+  strcat((char *)http, (char *)"<title>STM32 Web Server</title>\r\n");
+  strcat((char *)http, (char *)"<h2>InventekSys : Web Server using Es-Wifi with STM32</h2>\r\n");
+  strcat((char *)http, (char *)"<br /><hr>\r\n");
+  strcat((char *)http, (char *)"<p><form method=\"POST\"><strong>Temp: <input type=\"text\" size=2 value=\"");
+  sprintf((char *)temp, "%f", temperature);
+  strcat((char *)http, (char *)temp);
+  strcat((char *)http, (char *)"\"> <sup>O</sup>C");
+  
+  if (ledIsOn) 
+  {
+    strcat((char *)http, (char *)"<p><input type=\"radio\" name=\"radio\" value=\"0\" >LED off");
+    strcat((char *)http, (char *)"<br><input type=\"radio\" name=\"radio\" value=\"1\" checked>LED on");
+  } 
+  else 
+  {
+    strcat((char *)http, (char *)"<p><input type=\"radio\" name=\"radio\" value=\"0\" checked>LED off");
+    strcat((char *)http, (char *)"<br><input type=\"radio\" name=\"radio\" value=\"1\" >LED on");
+  }
+
+  strcat((char *)http, (char *)"</strong><p><input type=\"submit\"></form></span>");
+  strcat((char *)http, (char *)"</body>\r\n</html>\r\n");
+  
+  ret = WIFI_SendData(0, (uint8_t *)http, strlen((char *)http), &SentDataLength, WIFI_WRITE_TIMEOUT); 
+  
+  if((ret == WIFI_STATUS_OK) && (SentDataLength != strlen((char *)http)))
+  {
+    ret = WIFI_STATUS_ERROR;
+  }
+    
+  return ret;
+}