Diff: main.cpp

Revision:

0:c9670ffe21d4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Apr 07 14:13:13 2019 +0000
@@ -0,0 +1,188 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*  
+*/
+
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include "TCPSocket.h"
+#include "SocketAddress.h"
+#include <string.h>
+
+#define PORT 7070
+#define FLAG_SOCKET_ACCEPT  (1<<0)
+#define FLAG_SOCKET_CLOSED  (1<<1)
+#define FLAG_CLIENT_CONNECT (1<<2)
+
+Serial Uart(USBTX,USBRX);
+BusOut Leds(LED1,LED2,LED3,LED4);
+
+EventQueue *queue = mbed_event_queue();
+EventFlags evntFlags;
+EthernetInterface eth;  
+TCPSocket socket;
+TCPSocket *client;
+
+
+void set_leds(uint32_t leds) {
+    Leds = leds & 0xF;
+}
+
+void client_sigio(TCPSocket *client, EventFlags *evnt) {
+    
+    static enum {
+        RECEIVE,
+        CLOSE
+    } next_state = RECEIVE;
+    
+    static char buf[4];
+    static char *buf_p = buf;
+    static uint32_t remaining = 4;
+    
+    nsapi_size_or_error_t szerr;
+    
+    Uart.printf("client_sigio: state=%d\n\r", next_state);
+    
+    switch(next_state) {
+        case CLOSE: {
+            client->close();
+            evnt->clear(FLAG_CLIENT_CONNECT);
+            next_state = RECEIVE;
+            break;
+        }
+        case RECEIVE: {
+            szerr = client->recv(buf_p, remaining);
+            Uart.printf("Received %0d bytes\n\r", szerr);
+            if(szerr >= 0) {
+                buf_p += szerr;
+                remaining -= szerr;
+                if(0 == remaining) {
+                    // Send transaction
+                    Uart.printf("Received transaction: buf[3]=0x%0x buf[2]=0x%0x buf[1]=0x%0x buf[0]=0x%0x ", 
+                        buf[3], buf[2], buf[1], buf[0]);
+                }
+                break;
+            } else {
+                if(NSAPI_ERROR_WOULD_BLOCK == szerr) {
+                    break;
+                } else if(NSAPI_ERROR_NO_SOCKET == szerr) {
+                    next_state = CLOSE;
+                    // now fall through to default
+                } else {
+                    Uart.printf("client_sigio:  unhandled error on socket->recv(): %d\n\r", szerr);
+                }
+            }
+        }
+        default: {
+            // something went wrong so reset the buffer
+            buf_p = buf;
+            remaining = 4;
+        }
+    }
+}
+
+
+void server_sigio(TCPSocket *server, TCPSocket *client, EventFlags *evnt) {
+    
+    static enum {
+        LISTENING,
+        ACCEPT,
+        CLOSE
+    } next_state = LISTENING;
+
+    nsapi_error_t err;
+    
+    Uart.printf("server_sigio: state=%d\n\r", next_state);
+    
+    switch (next_state) {
+        case LISTENING: {
+            client = server->accept(&err);
+            switch(err) {
+                case NSAPI_ERROR_WOULD_BLOCK:
+                // Continue to listen
+                break;
+                case NSAPI_ERROR_OK: {
+                    // Accepted connection
+                    evnt->set(FLAG_CLIENT_CONNECT);
+                    Event<void()> client_handler = queue->event(client_sigio, client, evnt);
+                    client->set_blocking(false);
+                    client->sigio(client_handler);
+                    Uart.printf("calling client_handler()\n\r");
+                    client_handler.post();
+                    next_state = ACCEPT;
+                    Uart.printf("Just set state=%d\n\r", next_state);
+                    break;
+                }
+                default:
+                // Error in connection phase
+                Uart.printf("server_sigio: err = %d\n\r", err);   
+                //next_state = CLOSE;
+                break;
+            }
+            break;
+        }
+        case ACCEPT: {
+            //if (err == NSAPI_ERROR_WOULD_BLOCK)
+            //  break;
+            //next_state = CLOSE;
+            Uart.printf("server_sigio: evntFlags=0x%0x\n\r", evnt->get());
+            break;
+        }
+        case CLOSE: {
+            Uart.printf("server_sigio: CLOSE state\n\r");
+            //server->close();
+            //flgs->set(FLAG_SOCKET_CLOSED);
+            next_state = LISTENING;
+            break;
+        }
+        default: {
+            break;
+        }
+    }
+}
+
+
+// main() runs in its own thread in the OS
+int main()
+{
+    nsapi_error_t err;
+    nsapi_size_or_error_t szerr;
+
+    Event<void()> server_handler = queue->event(server_sigio, &socket, client, &evntFlags);
+
+    //Eventing evnt(&evntFlags);
+    //Uart.attach(&evnt, &Eventing::print_event_flags);
+    
+    if(eth.connect() != NSAPI_ERROR_OK) {
+        Uart.printf("Failed to connect to ethernet\n\r");
+        while(1) ;
+    } else {
+        Uart.printf("Connected to ethernet, IP address = %s\n\r", eth.get_ip_address());
+    }
+    
+    err = socket.open(&eth);
+    if(err != NSAPI_ERROR_OK) {
+        Uart.printf("Socket.open() failed with error: %d\n\r", err);
+    }
+    
+    err = socket.bind(PORT);
+    if(err != NSAPI_ERROR_OK) {
+        Uart.printf("Socket.bind() failed with error: %d\n\r", err);
+    }
+    
+    err = socket.listen();
+    if(err != NSAPI_ERROR_OK) {
+        Uart.printf("Socket.listen() failed with error: %d\n\r", err);
+    }
+    
+    socket.set_blocking(false);
+    socket.sigio(server_handler);
+    server_handler.post();
+    
+    while(1) {      
+        // All functionality handled within sigio() callbacks.
+    }
+}