Revision 1:a00097bc510b, committed 2022-03-10

Comitter:

ffxx68

Date:

Thu Mar 10 14:57:26 2022 +0000

Parent:

0:8765af830f0e

Commit message:

tested as working, receiving a file over serial

Changed in this revision

--- a/main.cpp	Mon Mar 07 14:31:11 2022 +0000
+++ b/main.cpp	Thu Mar 10 14:57:26 2022 +0000
@@ -1,33 +1,63 @@
 #include "mbed.h"
-
+#define BUF_SIZE 1024
+ 
+// attributes - peripherals
+Serial pc(SERIAL_TX, SERIAL_RX);
 DigitalOut myled(LED1);
-Serial pc(USBTX,USBRX); 
-
-int main()
-{
+Timer timeout;
+Ticker blinker;
  
-    pc.baud(9600); //  8 bit No parity 1 stop
-    int i = 0;
-    char inChar;
-    //PC.printf("\nPress Button to enter/exit sleep & deepsleep\n");
-    
-    // main loop
-    while( true ) {
+// attributes - program variables
+char fileOverSerialBuffer[BUF_SIZE];   // buffer to store received string over pc
+
+// local methods
+void ledBlink ( void ) {
+    myled != myled;
+}
+
+// main
+int main() {
+
+    int i;
+    int bytesReceived = 0;
+
+    pc.baud ( 600 ); // slow communication!
+    //pc.attach(&serialDataCallback);  // attach pc ISR
+
+    while ( true ) {
+
+        // ready for a new file to be received
+        bytesReceived = 0; 
+        timeout.stop();
+        timeout.reset();
+        blinker.attach( &ledBlink, 1.0 );
         
-        // wait for something on input
-        while ( !pc.readable() ) {
-            myled = !myled;
-            wait(.5)
+        // wait for input
+        while ( pc.readable() && timeout.read() < 1 ) {
+                if ( bytesReceived == 0 ) {
+                    timeout.start(); // watchdog 
+                    timeout.reset();
+                }
+                if ( bytesReceived < BUF_SIZE-1 ) { // avoid buffer overflow
+                    fileOverSerialBuffer[bytesReceived++] = pc.getc();
+                    myled = fileOverSerialBuffer[bytesReceived] & 0x01; // show activity
+                    timeout.reset(); // got byte: reset watchdog
+                } else
+                    break; // buffer full - stop receiving
         }
-        myled = 1; 
+
+        // file completed - process
+        fileOverSerialBuffer[bytesReceived+1] = '\x00'; // terminate a string
+        blinker.detach(); // stop flashing
+        myled = 1; // processing
+        pc.printf("Got %d bytes\n\r", bytesReceived);
+        for ( i=0; i < bytesReceived; i++) {
+            pc.printf("%.2x ", fileOverSerialBuffer[i]);
+            if ( !(i%16) && i!=0 ) pc.printf("\n\r");
+        }
+        pc.printf("\n\r");
+        myled = 0; // done
         
-        fflush(stdout);
-        inChar=pc.getc(); // get char over serial
-        pc.printf ("0x%.2X", inChar); // echo HEX code
-        if ( inChar = '\r' ) pc.putc('\n');  // add a line feed on return
-     
-    } 
-     
-    myled = 0;
-     
+
+    }
 }
\ No newline at end of file