Diff: main.cpp

Revision:

137:81b5a1672c6a

Parent:

136:53a83b91854c

Child:

138:e829be898713

--- a/main.cpp	Fri May 22 08:05:14 2020 +0000
+++ b/main.cpp	Tue May 26 00:30:01 2020 +0000
@@ -1,65 +1,106 @@
 #include "mbed.h"
-#include "Adafruit_SSD1306.h"
+#define SERVER_IP "192.168.0.10"
+#define SERVER_PORT 50000
+Serial pc(USBTX, USBRX, 115200);
+WiFiInterface *wifi;
+TCPSocket socket;
+Thread sock_thread;
+char rx_buf_pc[100];
+int index = 0;
+volatile int flag ;
 
-#define ADT7420_TEMP_REG (0x00)
-#define ADT7420_CONF_REG (0x03)
-#define EVAL_ADT7420_ADDR (0x48)
+void rx_cb(void)   // ISR for receiving data from the PC keyboard {
+{
+    char ch;
+    ch = pc.getc();
+    pc.putc(ch);
+    rx_buf_pc[index++] = ch;
+    if (ch == 0x0D) { //LF
+        pc.putc(0x0A);
+        rx_buf_pc[--index] = '\0';
+        index = 0;
+        flag = 1;
+    }
+}
 
-I2C i2c(I2C_SDA, I2C_SCL);
-RawSerial pc(PA_2, PA_3, 115200);
-
-
-Adafruit_SSD1306_SPI goled(D11, D13, D10, D4, D7, 64, 128);
+// rx_thread: a thread to receive data from the TCP server
+void rx_thread()
+{
+    char* buf = (char*)malloc(1024);
+    while (true) {
+        nsapi_size_or_error_t size = socket.recv(buf, 1024);
+        if (size <= 0) {
+            if (size == NSAPI_ERROR_WOULD_BLOCK) continue;
+// (-3001) no data for the case of Non-blocking mode
+            pc.printf("Error while receiving data from TCP socket (%d)\r\n", size);
+            return;
+        }
+        buf[size] = '\0'; // turn into valid C string
+        pc.printf("\r\nRX data: (%d) %s \r\n", size, buf);
+    }
+}
 
 int main() {
- 
-    int status;
-    float temp;
-    char data_write[2];
-    char data_read[2];
-    
-    i2c.frequency(100000);
-    data_write[0] = ADT7420_CONF_REG;
-    data_write[1] = 0x40;
-    status = i2c.write((EVAL_ADT7420_ADDR<<1), data_write, 2);
-    if(status!=0) {
-        pc.printf("I2C configuration error!\r\n");
-        while(1){
+    SocketAddress sockAddr;
+    SocketAddress serverAddr(SERVER_IP, SERVER_PORT);
+    pc.printf("\r\n WiFi TCP Client example\r\n");
+    pc.attach(&rx_cb);
+    wifi = WiFiInterface::get_default_instance();
+    if (!wifi)
+    {
+        pc.printf("ERROR: No WiFiInterface found.\n");
+        while(1);
+    }
+    pc.printf("Connecting to %s...\r\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)
+    {
+        pc.printf("Connection error!!\r\n");
+        while(1);
+    }
+
+    pc.printf("Success!!\r\n");
+    pc.printf("RSSI: %d\r\n", wifi->get_rssi());
+    wifi->get_ip_address();
+    pc.printf("IP: %s, ", sockAddr.get_ip_address());
+//wifi->get_netmask(&sockAddr);
+//pc.printf("Netmask: %s, ", sockAddr.get_ip_address()); pc.printf("Netmask: %s, ", wifi->get_netmask());
+    wifi->get_gateway();
+    pc.printf("Gateway: %s\r\n", sockAddr.get_ip_address());
+
+// Open a TCP socket on the network interface, and create a TCP connection to a Server
+    socket.open(wifi);
+    int response = socket.connect(serverAddr);
+    if(0 != response)
+    {
+        pc.printf("Error connecting: %d\r\n", response);
+        socket.close();
+        wifi->disconnect();
+        while(1);
+    }
+    sock_thread.start(&rx_thread);
+    while (true)
+    {
+        flag = 0;
+        pc.printf("Enter characters to send to a server: ");
+        while (flag != 1) {
+        }
+        if (!strcmp(rx_buf_pc, "q") || !strcmp(rx_buf_pc, "Q")) {
+            break;
+        } else {
+            int len = strlen(rx_buf_pc);
+            pc.printf("Sent: %s (%d)\r\n", rx_buf_pc, len);
+            rx_buf_pc[len++] = 0x0D;
+            rx_buf_pc[len++] = 0x0A;
+            socket.send((const char *)rx_buf_pc, len);
+            Thread::wait(500); // 0.5sec
         }
     }
-    goled.clearDisplay();
-    goled.splash();
-    ThisThread::sleep_for(3000);
-    goled.clearDisplay();
-    
-    goled.setTextSize(2);
-    goled.printf("OLED Lab.\r\n");
-    goled.setTextSize(1);
-    goled.printf("HGU in Pohang \r\n\r\n");
-    
-    int16_t cursor_x = goled.cursor_x;
-    int16_t cursor_y = goled.cursor_y;
-    
-    while(1) {
-        
-        goled.setTextCursor(cursor_x,cursor_y);
-        
-        data_write[0] = ADT7420_TEMP_REG;
-        i2c.write((EVAL_ADT7420_ADDR<<1),data_write,1,0);
-        i2c.read((EVAL_ADT7420_ADDR<<1 | 0x01), data_read, 2, 0);
-        
-        int tempval = ((int) data_read[0]<<8 | data_read[1]);
-        tempval >>= 3;
-        if((tempval & 0x1000) > 0) {
-            temp = (tempval - 8192)/16.0;
-        } else {
-            temp = tempval/16.0;
-        }
-        
-        pc.printf("Temperature: %0.4f\r\n", temp);
-        goled.printf("Temperature: %0.4f\r\n", temp);
-        goled.display();
-        
-        ThisThread::sleep_for(1000);
-    }
+    socket.close();
+    wifi->disconnect();
+    sock_thread.join();
+    pc.printf("RX sock_thread joined!!\r\n");
+    pc.printf("\nDone\r\n");
+    Thread::wait(osWaitForever);
 }
\ No newline at end of file