Diff: BlockingSerial.h

Revision:

0:5de67898f1cc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BlockingSerial.h	Tue Dec 14 15:08:27 2010 +0000
@@ -0,0 +1,54 @@
+#ifndef _BLOCKING_SERIAL
+#define _BLOCKING_SERIAL
+
+#include "mbed.h"
+
+class BlockingSerial:public SerialHalfDuplex
+{
+    public:
+    
+        BlockingSerial(PinName tx, PinName rx, char * name = NULL): SerialHalfDuplex(tx, rx, name)
+        {
+        }
+        
+        int putc(int c)
+        {
+            if (writeable())
+            {
+                //printf("++++");        // MPN: for some reason this needs to be here??
+                return Serial::putc(c);
+            }
+            
+            return   -1;
+        }
+        
+        int getc( int timeout = 1)
+        {
+            // if infinite timeout or we have a character, call base getc()
+            if ( timeout == -1 || readable() )
+                return Serial::getc();
+    
+              // no character yet  
+              bool has_data = false;
+              // count elapsed time
+              Timer timer;
+              timer.start();
+              // loop until we have data or timeout elapses
+              while ( !has_data && timer.read_ms() < timeout )
+              {
+                // wait a short time
+                wait_ms(1);
+                // check again
+                has_data = readable();
+              }
+              // do we have anything?
+              if ( has_data )
+                // yes, read it
+                return Serial::getc();
+              else
+                // no, timed out
+                return -1;
+       };
+
+};
+#endif _BLOCKING_SERIAL
\ No newline at end of file