Derek Fukumori / MODSERIAL

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Fork of MODSERIAL by Andy K

GETC.cpp@23:1236d0b64e71, 2012-07-13 (annotated)

Committer:
dfukumori
Date:
Fri Jul 13 01:09:23 2012 +0000
Revision:
23:1236d0b64e71
Parent:
22:c11ea36f17f9 
Required commit -- no changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dfukumori 23:1236d0b64e71 1 /*
dfukumori 23:1236d0b64e71 2 Copyright (c) 2010 Andy Kirkham
dfukumori 23:1236d0b64e71 3
dfukumori 23:1236d0b64e71 4 Permission is hereby granted, free of charge, to any person obtaining a copy
dfukumori 23:1236d0b64e71 5 of this software and associated documentation files (the "Software"), to deal
dfukumori 23:1236d0b64e71 6 in the Software without restriction, including without limitation the rights
dfukumori 23:1236d0b64e71 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
dfukumori 23:1236d0b64e71 8 copies of the Software, and to permit persons to whom the Software is
dfukumori 23:1236d0b64e71 9 furnished to do so, subject to the following conditions:
dfukumori 23:1236d0b64e71 10
dfukumori 23:1236d0b64e71 11 The above copyright notice and this permission notice shall be included in
dfukumori 23:1236d0b64e71 12 all copies or substantial portions of the Software.
dfukumori 23:1236d0b64e71 13
dfukumori 23:1236d0b64e71 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
dfukumori 23:1236d0b64e71 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
dfukumori 23:1236d0b64e71 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
dfukumori 23:1236d0b64e71 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
dfukumori 23:1236d0b64e71 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
dfukumori 23:1236d0b64e71 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
dfukumori 23:1236d0b64e71 20 THE SOFTWARE.
dfukumori 23:1236d0b64e71 21 */
dfukumori 23:1236d0b64e71 22
dfukumori 23:1236d0b64e71 23 #include "MODSERIAL.h"
dfukumori 23:1236d0b64e71 24 #include "MACROS.h"
dfukumori 23:1236d0b64e71 25
dfukumori 23:1236d0b64e71 26 namespace AjK {
dfukumori 23:1236d0b64e71 27
dfukumori 23:1236d0b64e71 28 int
dfukumori 23:1236d0b64e71 29 MODSERIAL::__getc(bool block)
dfukumori 23:1236d0b64e71 30 {
dfukumori 23:1236d0b64e71 31 // If no buffer is in use fall back to standard RX FIFO usage.
dfukumori 23:1236d0b64e71 32 // Note, we must block in this case and ignore bool "block"
dfukumori 23:1236d0b64e71 33 // so as to maintain compat with Mbed Serial.
dfukumori 23:1236d0b64e71 34 if (buffer_size[RxIrq] == 0 || buffer[RxIrq] == (char *)NULL) {
dfukumori 23:1236d0b64e71 35 while(! MODSERIAL_RBR_HAS_DATA ) ;
dfukumori 23:1236d0b64e71 36 return (int)(_RBR & 0xFF);
dfukumori 23:1236d0b64e71 37 }
dfukumori 23:1236d0b64e71 38
dfukumori 23:1236d0b64e71 39 if (block) { while ( MODSERIAL_RX_BUFFER_EMPTY ) ; } // Blocks.
dfukumori 23:1236d0b64e71 40 else if ( MODSERIAL_RX_BUFFER_EMPTY ) return -1;
dfukumori 23:1236d0b64e71 41
dfukumori 23:1236d0b64e71 42 int c = buffer[RxIrq][buffer_out[RxIrq]];
dfukumori 23:1236d0b64e71 43 buffer_out[RxIrq]++;
dfukumori 23:1236d0b64e71 44 if (buffer_out[RxIrq] >= buffer_size[RxIrq]) {
dfukumori 23:1236d0b64e71 45 buffer_out[RxIrq] = 0;
dfukumori 23:1236d0b64e71 46 }
dfukumori 23:1236d0b64e71 47
dfukumori 23:1236d0b64e71 48 // If we have made space in the RX Buffer then copy over
dfukumori 23:1236d0b64e71 49 // any characters in the RX FIFO that my reside there.
dfukumori 23:1236d0b64e71 50 // Temporarily disable the RX IRQ so that we do not re-enter
dfukumori 23:1236d0b64e71 51 // it under interrupts.
dfukumori 23:1236d0b64e71 52 if ( ! MODSERIAL_RX_BUFFER_FULL ) {
dfukumori 23:1236d0b64e71 53 uint32_t ier = _IER;
dfukumori 23:1236d0b64e71 54 _IER &= ~(1UL << 0);
dfukumori 23:1236d0b64e71 55 isr_rx();
dfukumori 23:1236d0b64e71 56 _IER = ier;
dfukumori 23:1236d0b64e71 57 }
dfukumori 23:1236d0b64e71 58
dfukumori 23:1236d0b64e71 59 __disable_irq();
dfukumori 23:1236d0b64e71 60 buffer_count[RxIrq]--;
dfukumori 23:1236d0b64e71 61 __enable_irq();
dfukumori 23:1236d0b64e71 62 return c;
dfukumori 23:1236d0b64e71 63 }
dfukumori 23:1236d0b64e71 64
dfukumori 23:1236d0b64e71 65 }; // namespace AjK ends