Diff: Methods/sb_putc.cpp

Revision:

0:62a1c91a859a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Methods/sb_putc.cpp	Fri Feb 18 22:28:05 2011 +0000
@@ -0,0 +1,56 @@
+/*
+    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 "../SerialBuffered.h"
+#include "../sb_globals.h"
+
+int SerialBuffered::putc(int c, bool blocking) {
+    if ((GET_REGISTER(SERIALBUFFERED_LSR) & 0x20) && (_tx_buffer_in[uart_number] == _tx_buffer_out[uart_number] && !_tx_buffer_full[uart_number])) {
+        SET_REGISTER(SERIALBUFFERED_THR, (uint8_t)c);
+    }
+    else {
+        if (_tx_buffer_full[uart_number]) {
+            if (blocking) while (_tx_buffer_full[uart_number]) ; /* Blocks!!! */    
+            else {
+                _tx_buffer_overflow[uart_number] = true;
+                return -1;
+            }
+        }  
+        _tx_buffer[uart_number][_tx_buffer_in[uart_number]++] = (char)c;
+        if (_tx_buffer_in[uart_number] >= _tx_buffer_size[uart_number]) {
+            _tx_buffer_in[uart_number] = 0;
+        }
+        if (_tx_buffer_in[uart_number] == _tx_buffer_out[uart_number] && !_tx_buffer_full[uart_number]) _tx_buffer_full[uart_number] = true;
+        SET_REGISTER(SERIALBUFFERED_IER, 0x3);        
+    }
+    return 0;
+}
+
+/** putc
+ */
+int SerialBuffered::putc(int c) {
+    return putc(c, true);
+}
+
+int SerialBuffered::writeable(void) {
+    return (!_tx_buffer_full[uart_number] && !_tx_buffer_overflow[uart_number]) ? 1 : 0;
+}