Revision 0:083b8565faf6, committed 2021-12-11

Comitter:

ostoja

Date:

Sat Dec 11 16:26:34 2021 +0000

Commit message:

Nenad Tepavac 0028/2020

Changed in this revision

diff -r 000000000000 -r 083b8565faf6 19E042PIM_MB_PINS.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/19E042PIM_MB_PINS.lib	Sat Dec 11 16:26:34 2021 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/tzwell/code/19E042PIM_MB_PINS/#5722459a201f

diff -r 000000000000 -r 083b8565faf6 Adafruit_GFX.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_GFX.lib	Sat Dec 11 16:26:34 2021 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/nkhorman/code/Adafruit_GFX/#7fb1d4d3525d

diff -r 000000000000 -r 083b8565faf6 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Dec 11 16:26:34 2021 +0000
@@ -0,0 +1,276 @@
+/*
+ * Program implements MQTT client on a NUCLEO-L476RG board
+ * using arm mbed-mqtt library and ESP-WROOM-02 WiFi modem.
+ *
+ * University of Belgrade - School of Electrical Engineering
+ * Department of Electronics
+ * Bulevar Kralja Aleksandra 73, 11120 Belgrade, Serbia
+ *
+ * November 2021.
+ *
+ */
+
+#include "mbed.h"
+#include "mb_pins.h"
+#include "platform/mbed_thread.h"
+#include "MQTTClientMbedOs.h"
+#include <string>
+#include "Adafruit_GFX.h"
+#include "Adafruit_GFX_Config.h"
+#include "Adafruit_SSD1306.h"
+ 
+// I2C bus pins:
+#define D_SDA                  PB_14 
+#define D_SCL                  PB_13     
+// I2C address, 60d or 0x3c:
+#define I2C_REAL_ADD                                                        0x3c
+#define I2C_ADDRESS                                            I2C_REAL_ADD << 1 
+// Set OLED width and heigth [pixel]:
+#define OLED_WIDTH_PX                                                        128
+#define OLED_HEIGHT_PX                                                        64
+// I2C frequency:
+#define I2C_FREQUENCY                                                     400000
+// Multipliers of POT1 and POT2 for OLED rectangle position:
+#define WIDTH_SCALER                                                         128
+#define HEIGHT_SCALER                                                         64
+// Initial rectangle position:
+#define INITIAL_X_POSITION                                     OLED_WIDTH_PX / 2
+#define INITIAL_Y_POSITION                                    OLED_HEIGHT_PX / 2
+// Refresh rate:
+#define REFRESH_RATE_MS                                                        5
+// Half of the potentiometer return value: 
+#define HALF_INTERVAL                                                       0.5f   
+
+#define MAX_ENEMIES 20
+#define MAX_BULLETS 20
+// Initialize I2C:
+I2C i2c(PB_14,PB_13);
+ 
+// Initialize OLED display:
+Adafruit_SSD1306_I2c myOled(i2c,PB_5,I2C_ADDRESS,OLED_HEIGHT_PX,OLED_WIDTH_PX);
+
+// LED2 blinking rate:
+#define BLINKING_RATE_MS                                                     250
+// Scaler to 3v3L
+#define VOLTAGE_SCALER                                                      3.3f
+// Client yield timeout in miliseconds:
+#define YIELD_TIMEOUT_MS                                                    1000
+// Maximum number of networks to scan for:
+#define MAX_NETWORKS                                                          15
+// Small delay for network information printing:
+#define PRINTF_DELAY_MS                                                       10
+
+
+// Left potentiometer:
+AnalogIn pot1(MB_POT1);
+// Left button on the motherboard:
+InterruptIn sw1(MB_SW1);
+// Right LED on the motherboard:
+DigitalOut led2(MB_LED2);
+// Pointer to a WiFi network object:
+WiFiInterface *wifi;
+// Creating TCP socket:
+TCPSocket socket;
+// Creating MQTT client using the TCP socket;
+MQTTClient client(&socket);
+// Message handler:
+MQTT::Message message;
+
+char* topic = "pubpim";
+char* topic_sub = "subpim";
+int start_flag =0;
+// Counter of arrived messages:
+int arrivedcount = 0;
+// Flag indicating that button is not pressed:
+int button_pressed=0;
+// HiveMQ broker connectivity information:
+const char* hostname = "broker.hivemq.com";
+int port = 1883;
+// Returning a string for a provided network encryption: 
+const char *sec2str(nsapi_security_t sec)
+{
+    switch (sec) 
+    {
+        case NSAPI_SECURITY_NONE:
+            return "None";
+        case NSAPI_SECURITY_WEP:
+            return "WEP";
+        case NSAPI_SECURITY_WPA:
+            return "WPA";
+        case NSAPI_SECURITY_WPA2:
+            return "WPA2";
+        case NSAPI_SECURITY_WPA_WPA2:
+            return "WPA/WPA2";
+        case NSAPI_SECURITY_UNKNOWN:
+        default:
+            return "Unknown";
+    }
+}
+
+int scan_networks(WiFiInterface *wifi)
+{
+    printf("Scan:\n");
+    
+    // Scan only for the number of networks, first parameter is NULL:
+    int count = wifi->scan(NULL, 0);
+    // If there are no networks, count == 0, if there is an error, counter < 0:
+    if (count <= 0)
+    {
+        printf("scan() failed with return value: %d\n", count);
+        return 0;
+    }
+
+    // Limit number of network arbitrary to some reasonable number:
+    count = count < MAX_NETWORKS ? count : MAX_NETWORKS;
+    
+    // Create a local pointer to an object, which is an array of WiFi APs:
+    WiFiAccessPoint *ap = new WiFiAccessPoint[count];
+    // Now scan again for 'count' networks and populate the array of APs:
+    count = wifi->scan(ap, count);
+    
+    // This time, the number of entries to 'ap' is returned:
+    if (count <= 0) 
+    {
+        printf("scan() failed with return value: %d\n", count);
+        return 0;
+    }
+    
+    // Print out the parameters of each AP:
+    for (int i = 0; i < count; i++) 
+    {
+        printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\n", ap[i].get_ssid(),
+               sec2str(ap[i].get_security()), ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2],
+               ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5], ap[i].get_rssi(), ap[i].get_channel());
+        thread_sleep_for(PRINTF_DELAY_MS);
+    }
+    printf("%d networks available.\n", count);
+    
+    // Since 'ap' is dynamically allocated pointer to the array of objects, it
+    // needs to be deleted:
+    delete[] ap;
+    return count;
+}
+
+void messageArrived(MQTT::MessageData& md)
+{
+    MQTT::Message &message = md.message;
+    //printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id);
+    printf("Message from the browser: %.*s\r\n", message.payloadlen, (char*)message.payload);
+    ++arrivedcount;
+    char buf[100];
+    sprintf(buf, "%.*s", message.payloadlen, (char*)message.payload);
+    if(strcmp("start",buf)== 0){
+        printf("start signal sent\n");
+        start_flag = 1;
+        }
+    if(strcmp("stop",buf)== 0){
+        printf("stop signal sent\n");
+        start_flag = 0;
+        }
+        
+    if(arrivedcount > 5){
+        arrivedcount = 0;
+        myOled.clearDisplay();
+    }    
+        
+    for(int i = 0;i < message.payloadlen;i++){
+        myOled.drawChar(10 + 5 * i,arrivedcount * 10,buf[i], WHITE,BLACK,1);
+    }    
+    myOled.display();
+        
+}
+
+void buttonFunction() {
+    
+    button_pressed=1;
+   
+}
+
+int main()
+{
+    myOled.begin();
+    
+    //buzzer.period(0.002f);
+
+    i2c.frequency(I2C_FREQUENCY);
+    // Set the interrupt event:
+    sw1.fall(&buttonFunction); 
+    
+    // Create a default network interface:
+    wifi = WiFiInterface::get_default_instance();
+    if (!wifi) {
+        printf("ERROR: No WiFiInterface found.\n");
+        return -1;
+    }
+    
+    // Scan for available networks and aquire information about Access Points:
+    int count = scan_networks(wifi);
+    if (count == 0) {
+        printf("No WIFI APs found - can't continue further.\n");
+        return -1;
+    }
+    
+    // Connect to the network with the parameters specified in 'mbed_app.json':
+    printf("\nConnecting to %s...\n", MBED_CONF_APP_WIFI_SSID);
+    int ret = wifi->connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2);
+    if (ret != 0) {
+        printf("\nConnection error: %d\n", ret);
+        return -1;
+    }
+    
+    // Print out the information aquired:
+    printf("Success\n\n");
+    printf("MAC: %s\n", wifi->get_mac_address());
+    printf("IP: %s\n", wifi->get_ip_address());
+    printf("Netmask: %s\n", wifi->get_netmask());
+    printf("Gateway: %s\n", wifi->get_gateway());
+    printf("RSSI: %d\n\n", wifi->get_rssi());   
+    
+    // Open TCP socket using WiFi network interface:
+    socket.open(wifi);
+    // Connect to the HiveMQ broker:
+    socket.connect(hostname, port);
+    // Fill connect data with default values:
+    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
+    // Change only ID and protocol version:
+    data.MQTTVersion = 3;
+    data.clientID.cstring = "pim-08";
+    
+    // Connect the 
+    int rc = 0;
+    if ((rc = client.connect(data)) != 0)
+        printf("rc from MQTT connect is %d\r\n", rc);
+
+    if ((rc = client.subscribe(topic_sub, MQTT::QOS2, messageArrived)) != 0)
+        printf("rc from MQTT subscribe is %d\r\n", rc);
+      
+    while (true) {
+        // Show that the loop is running by switching motherboard LED2:
+        led2 = !led2;
+        thread_sleep_for(BLINKING_RATE_MS);
+        if (button_pressed==1 && start_flag == 1) {
+            button_pressed=0;      
+            // QoS 0
+            char buf[100];
+            sprintf(buf, "V(POT1) = %1.2f\r\n", pot1*VOLTAGE_SCALER);
+            message.qos = MQTT::QOS0;
+            message.retained = false;
+            message.dup = false;
+            message.payload = (void*)buf;
+            message.payloadlen = strlen(buf)+1;
+            client.publish(topic, message);
+        ++arrivedcount;
+        if(arrivedcount > 5){
+        arrivedcount = 0;
+        myOled.clearDisplay();
+    }    
+        for(int i = 0;i < message.payloadlen;i++){
+            myOled.drawChar(10 + 5 * i,arrivedcount * 10,buf[i], WHITE,BLACK,1);
+        }    
+        myOled.display();
+        }
+        
+        // Need to call yield API to maintain connection:
+        client.yield(YIELD_TIMEOUT_MS);
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 083b8565faf6 mbed-mqtt.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-mqtt.lib	Sat Dec 11 16:26:34 2021 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-mqtt/#7fa219e87b3355e8a6fd281659697fe3a0c87630

diff -r 000000000000 -r 083b8565faf6 mbed-os.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Sat Dec 11 16:26:34 2021 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#e4b81f67f939a0c0b11c147ce74aa367271e1279

diff -r 000000000000 -r 083b8565faf6 mbed_app.json
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_app.json	Sat Dec 11 16:26:34 2021 +0000
@@ -0,0 +1,25 @@
+{
+    "config": {
+        "wifi-ssid": {
+            "help": "WIFI SSID",
+            "value": "\"Ostoja\""
+        },
+        "wifi-password": {
+            "help": "cvele97",
+            "value": "\"ekonomskitigar2021\""
+        }
+    },
+    "target_overrides": {
+        "*": {
+            "platform.stdio-convert-newlines": true
+        },
+        "NUCLEO_L476RG": {
+            "target.network-default-interface-type": "WIFI",
+            "esp8266.tx"                           : "PC_4",
+            "esp8266.rx"                           : "PC_5",
+            "esp8266.provide-default"              : true,
+            "drivers.uart-serial-rxbuf-size"       : 1024,
+            "drivers.uart-serial-txbuf-size"       : 1024
+        }
+    }    
+}
\ No newline at end of file