Diff: BufferSerial.cpp

Revision:

0:633dd0246854

diff -r 000000000000 -r 633dd0246854 BufferSerial.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BufferSerial.cpp	Sun May 19 16:08:07 2013 +0000
@@ -0,0 +1,57 @@
+#include "BufferSerial.h"
+
+BufferSerial :: BufferSerial( PinName tx , PinName rx ) : Serial( tx , rx ) {
+    _setup( 1 );
+}
+
+BufferSerial :: BufferSerial( PinName tx , PinName rx , const int& bufferSize ) : Serial( tx , rx ) {
+    _setup( bufferSize );
+}
+
+BufferSerial :: BufferSerial( PinName tx , PinName rx , const int& bufferSize , const char* name ) : Serial( tx , rx , name ) {
+    _setup( bufferSize );
+}
+
+BufferSerial :: ~BufferSerial() {
+    delete[] _buf;
+}
+
+void BufferSerial :: _setup( const int& bufferSize ) {
+    if ( bufferSize > 1 ){
+        _buf = new unsigned char[ bufferSize ];
+        _size = bufferSize - 1;
+    }else{
+        _buf = new unsigned char[ 2 ];
+        _size = 1;
+    }
+    _present = 0;
+    _last = 0;
+    attach( this, & BufferSerial :: _irq );
+}
+
+int BufferSerial :: _getShift( const int& value ) {
+    return value ? ( value - 1 ) : _size ;
+}
+
+void BufferSerial :: _irq( void ) {
+    int n = _getShift( _last );
+    _buf[ n ] = (unsigned char)( Serial :: getc() );
+    _last = n;
+}
+
+int BufferSerial :: unreadable( void ) {
+    return ( _present == _last );
+}
+
+int BufferSerial :: readable( void ) {
+    return ! unreadable();
+}
+
+int BufferSerial :: getc( void ) {
+    if ( unreadable() ){
+        return -1;
+    }else{
+        _present = _getShift( _present );
+        return (int)_buf[ _present ];
+    }
+}