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Dependencies:   mbed CANBuffer Watchdog MODSERIAL mbed-rtos xbeeRelay IAP

Fork of SystemManagement by Martin Deng

Libs/MODSERIAL/GETC.cpp@31:7eaa5e881b56, 2014-11-14 (annotated)

Committer:
pspatel321
Date:
Fri Nov 14 06:05:59 2014 +0000
Revision:
31:7eaa5e881b56
Mostly working.  Wrote CAN in/out code.  Xbee still needs work.  My guess is that MODDMA breaks when used with RTOS.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pspatel321 31:7eaa5e881b56 1 /*
pspatel321 31:7eaa5e881b56 2 Copyright (c) 2010 Andy Kirkham
pspatel321 31:7eaa5e881b56 3
pspatel321 31:7eaa5e881b56 4 Permission is hereby granted, free of charge, to any person obtaining a copy
pspatel321 31:7eaa5e881b56 5 of this software and associated documentation files (the "Software"), to deal
pspatel321 31:7eaa5e881b56 6 in the Software without restriction, including without limitation the rights
pspatel321 31:7eaa5e881b56 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
pspatel321 31:7eaa5e881b56 8 copies of the Software, and to permit persons to whom the Software is
pspatel321 31:7eaa5e881b56 9 furnished to do so, subject to the following conditions:
pspatel321 31:7eaa5e881b56 10
pspatel321 31:7eaa5e881b56 11 The above copyright notice and this permission notice shall be included in
pspatel321 31:7eaa5e881b56 12 all copies or substantial portions of the Software.
pspatel321 31:7eaa5e881b56 13
pspatel321 31:7eaa5e881b56 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
pspatel321 31:7eaa5e881b56 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
pspatel321 31:7eaa5e881b56 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
pspatel321 31:7eaa5e881b56 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
pspatel321 31:7eaa5e881b56 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
pspatel321 31:7eaa5e881b56 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
pspatel321 31:7eaa5e881b56 20 THE SOFTWARE.
pspatel321 31:7eaa5e881b56 21 */
pspatel321 31:7eaa5e881b56 22
pspatel321 31:7eaa5e881b56 23 #include "MODSERIAL.h"
pspatel321 31:7eaa5e881b56 24 #include "MACROS.h"
pspatel321 31:7eaa5e881b56 25
pspatel321 31:7eaa5e881b56 26 namespace AjK {
pspatel321 31:7eaa5e881b56 27
pspatel321 31:7eaa5e881b56 28 int
pspatel321 31:7eaa5e881b56 29 MODSERIAL::__getc(bool block)
pspatel321 31:7eaa5e881b56 30 {
pspatel321 31:7eaa5e881b56 31 // If no buffer is in use fall back to standard RX FIFO usage.
pspatel321 31:7eaa5e881b56 32 // Note, we must block in this case and ignore bool "block"
pspatel321 31:7eaa5e881b56 33 // so as to maintain compat with Mbed Serial.
pspatel321 31:7eaa5e881b56 34 if (buffer_size[RxIrq] == 0 || buffer[RxIrq] == (char *)NULL) {
pspatel321 31:7eaa5e881b56 35 while(! MODSERIAL_RBR_HAS_DATA ) ;
pspatel321 31:7eaa5e881b56 36 return (int)(_RBR & 0xFF);
pspatel321 31:7eaa5e881b56 37 }
pspatel321 31:7eaa5e881b56 38
pspatel321 31:7eaa5e881b56 39 if (block) { while ( MODSERIAL_RX_BUFFER_EMPTY ) ; } // Blocks.
pspatel321 31:7eaa5e881b56 40 else if ( MODSERIAL_RX_BUFFER_EMPTY ) return -1;
pspatel321 31:7eaa5e881b56 41
pspatel321 31:7eaa5e881b56 42 int c = buffer[RxIrq][buffer_out[RxIrq]];
pspatel321 31:7eaa5e881b56 43 buffer_out[RxIrq]++;
pspatel321 31:7eaa5e881b56 44 if (buffer_out[RxIrq] >= buffer_size[RxIrq]) {
pspatel321 31:7eaa5e881b56 45 buffer_out[RxIrq] = 0;
pspatel321 31:7eaa5e881b56 46 }
pspatel321 31:7eaa5e881b56 47
pspatel321 31:7eaa5e881b56 48 // If we have made space in the RX Buffer then copy over
pspatel321 31:7eaa5e881b56 49 // any characters in the RX FIFO that my reside there.
pspatel321 31:7eaa5e881b56 50 // Temporarily disable the RX IRQ so that we do not re-enter
pspatel321 31:7eaa5e881b56 51 // it under interrupts.
pspatel321 31:7eaa5e881b56 52 if ( ! MODSERIAL_RX_BUFFER_FULL ) {
pspatel321 31:7eaa5e881b56 53 uint32_t ier = _IER;
pspatel321 31:7eaa5e881b56 54 _IER &= ~(1UL << 0);
pspatel321 31:7eaa5e881b56 55 isr_rx();
pspatel321 31:7eaa5e881b56 56 _IER = ier;
pspatel321 31:7eaa5e881b56 57 }
pspatel321 31:7eaa5e881b56 58
pspatel321 31:7eaa5e881b56 59 __disable_irq();
pspatel321 31:7eaa5e881b56 60 buffer_count[RxIrq]--;
pspatel321 31:7eaa5e881b56 61 __enable_irq();
pspatel321 31:7eaa5e881b56 62 return c;
pspatel321 31:7eaa5e881b56 63 }
pspatel321 31:7eaa5e881b56 64
pspatel321 31:7eaa5e881b56 65 }; // namespace AjK ends