Diploma Thesis in Aerospace Engineering, January 2014

Diff: MODSERIAL/GETC.cpp

Revision:

0:1447d2f773db

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MODSERIAL/GETC.cpp	Wed Jul 09 07:35:50 2014 +0000
@@ -0,0 +1,65 @@
+/*
+    Copyright (c) 2010 Andy Kirkham
+ 
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+ 
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+ 
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+*/
+
+#include "MODSERIAL.h"
+#include "MACROS.h"
+
+namespace AjK {
+
+int 
+MODSERIAL::__getc(bool block)
+{
+    // If no buffer is in use fall back to standard RX FIFO usage.
+    // Note, we must block in this case and ignore bool "block" 
+    // so as to maintain compat with Mbed Serial.
+    if (buffer_size[RxIrq] == 0 || buffer[RxIrq] == (char *)NULL) {
+        while(! MODSERIAL_RBR_HAS_DATA ) ;
+        return (int)(_RBR & 0xFF);
+    }
+
+    if (block) { while ( MODSERIAL_RX_BUFFER_EMPTY ) ; } // Blocks.
+    else if ( MODSERIAL_RX_BUFFER_EMPTY ) return -1;
+    
+    int c = buffer[RxIrq][buffer_out[RxIrq]];
+    buffer_out[RxIrq]++;
+    if (buffer_out[RxIrq] >= buffer_size[RxIrq]) {
+        buffer_out[RxIrq] = 0;
+    }
+    
+    // If we have made space in the RX Buffer then copy over
+    // any characters in the RX FIFO that my reside there.
+    // Temporarily disable the RX IRQ so that we do not re-enter 
+    // it under interrupts.
+    if ( ! MODSERIAL_RX_BUFFER_FULL ) {
+        uint32_t ier = _IER;
+        _IER &= ~(1UL << 0);
+        isr_rx();    
+        _IER = ier;
+    }
+    
+    __disable_irq();
+    buffer_count[RxIrq]--;   
+    __enable_irq();
+    return c;
+}
+
+}; // namespace AjK ends