ISR_RX.cpp

00001 /*
00002     Copyright (c) 2010 Andy Kirkham
00003  
00004     Permission is hereby granted, free of charge, to any person obtaining a copy
00005     of this software and associated documentation files (the "Software"), to deal
00006     in the Software without restriction, including without limitation the rights
00007     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008     copies of the Software, and to permit persons to whom the Software is
00009     furnished to do so, subject to the following conditions:
00010  
00011     The above copyright notice and this permission notice shall be included in
00012     all copies or substantial portions of the Software.
00013  
00014     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020     THE SOFTWARE.
00021 */
00022 
00023 #include "MODSERIAL.h"
00024 #include "MACROS.h"
00025 
00026 namespace AjK {
00027         
00028 void 
00029 MODSERIAL::isr_rx(void)
00030 {
00031     if (RX_IRQ_ENABLED) {
00032     if (! _base || buffer_size[RxIrq] == 0 || buffer[RxIrq] == (char *)NULL) {
00033         _isr[RxIrq].call(&this->callbackInfo); 
00034         return;
00035     } 
00036     
00037     while( MODSERIAL_READABLE ) {
00038         rxc = (char)(MODSERIAL_READ_REG & 0xFF); 
00039         if ( MODSERIAL_RX_BUFFER_FULL ) {
00040             buffer_overflow[RxIrq] = rxc; // Oh dear, no room in buffer.
00041             _isr[RxOvIrq].call(&this->callbackInfo);
00042         }
00043         else {
00044             if (buffer[RxIrq] != (char *)NULL) {
00045                 buffer[RxIrq][buffer_in[RxIrq]] = rxc;
00046                 buffer_count[RxIrq]++; 
00047                 buffer_in[RxIrq]++;
00048                 if (buffer_in[RxIrq] >= buffer_size[RxIrq]) {
00049                     buffer_in[RxIrq] = 0;
00050                 }
00051             }  
00052             _isr[RxIrq].call(&this->callbackInfo); 
00053         }
00054         if (auto_detect_char == rxc) {
00055             _isr[RxAutoDetect].call(&this->callbackInfo);
00056         }
00057     }  
00058     }  
00059 }
00060 
00061 }; // namespace AjK ends
00062 
00063