Dan Matthews / Mbed 2 deprecated GPS_Incremental-V1_0

Changes to allow hardware camera trigger

Dependencies:   mbed

Fork of GPS_Incremental by james kain

MODSERIAL/PUTC.cpp@10:078891935385, 2013-04-18 (annotated)

Committer:
dannyman939
Date:
Thu Apr 18 00:59:49 2013 +0000
Revision:
10:078891935385
Parent:
0:c746ee34feae 
Hardware trigger camera using the DigitalOut of Pin 2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dannyman939 0:c746ee34feae 1 /*
dannyman939 0:c746ee34feae 2 Copyright (c) 2010 Andy Kirkham
dannyman939 0:c746ee34feae 3
dannyman939 0:c746ee34feae 4 Permission is hereby granted, free of charge, to any person obtaining a copy
dannyman939 0:c746ee34feae 5 of this software and associated documentation files (the "Software"), to deal
dannyman939 0:c746ee34feae 6 in the Software without restriction, including without limitation the rights
dannyman939 0:c746ee34feae 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
dannyman939 0:c746ee34feae 8 copies of the Software, and to permit persons to whom the Software is
dannyman939 0:c746ee34feae 9 furnished to do so, subject to the following conditions:
dannyman939 0:c746ee34feae 10
dannyman939 0:c746ee34feae 11 The above copyright notice and this permission notice shall be included in
dannyman939 0:c746ee34feae 12 all copies or substantial portions of the Software.
dannyman939 0:c746ee34feae 13
dannyman939 0:c746ee34feae 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
dannyman939 0:c746ee34feae 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
dannyman939 0:c746ee34feae 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
dannyman939 0:c746ee34feae 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
dannyman939 0:c746ee34feae 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
dannyman939 0:c746ee34feae 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
dannyman939 0:c746ee34feae 20 THE SOFTWARE.
dannyman939 0:c746ee34feae 21 */
dannyman939 0:c746ee34feae 22
dannyman939 0:c746ee34feae 23 #include "MODSERIAL.h"
dannyman939 0:c746ee34feae 24 #include "MACROS.h"
dannyman939 0:c746ee34feae 25
dannyman939 0:c746ee34feae 26 namespace AjK {
dannyman939 0:c746ee34feae 27
dannyman939 0:c746ee34feae 28 int
dannyman939 0:c746ee34feae 29 MODSERIAL::__putc(int c, bool block) {
dannyman939 0:c746ee34feae 30
dannyman939 0:c746ee34feae 31 // If no buffer is in use fall back to standard TX FIFO usage.
dannyman939 0:c746ee34feae 32 // Note, we must block in this case and ignore bool "block"
dannyman939 0:c746ee34feae 33 // so as to maintain compat with Mbed Serial.
dannyman939 0:c746ee34feae 34 if (buffer[TxIrq] == (char *)NULL || buffer_size[TxIrq] == 0) {
dannyman939 0:c746ee34feae 35 while (! MODSERIAL_THR_HAS_SPACE) ; // Wait for space in the TX FIFO.
dannyman939 0:c746ee34feae 36 _THR = (uint32_t)c;
dannyman939 0:c746ee34feae 37 return 0;
dannyman939 0:c746ee34feae 38 }
dannyman939 0:c746ee34feae 39
dannyman939 0:c746ee34feae 40 if ( MODSERIAL_THR_HAS_SPACE && MODSERIAL_TX_BUFFER_EMPTY && dmaSendChannel == -1 ) {
dannyman939 0:c746ee34feae 41 _THR = (uint32_t)c;
dannyman939 0:c746ee34feae 42 }
dannyman939 0:c746ee34feae 43 else {
dannyman939 0:c746ee34feae 44 if (block) {
dannyman939 0:c746ee34feae 45 uint32_t ier = _IER; _IER = 1;
dannyman939 0:c746ee34feae 46 while ( MODSERIAL_TX_BUFFER_FULL ) { // Blocks!
dannyman939 0:c746ee34feae 47 // If putc() is called from an ISR then we are stuffed
dannyman939 0:c746ee34feae 48 // because in an ISR no bytes from the TX buffer will
dannyman939 0:c746ee34feae 49 // get transferred to teh TX FIFOs while we block here.
dannyman939 0:c746ee34feae 50 // So, to work around this, instead of sitting in a
dannyman939 0:c746ee34feae 51 // loop waiting for space in the TX buffer (which will
dannyman939 0:c746ee34feae 52 // never happen in IRQ context), check to see if the
dannyman939 0:c746ee34feae 53 // TX FIFO has space available to move bytes from the
dannyman939 0:c746ee34feae 54 // TX buffer to TX FIFO to make space. The easiest way
dannyman939 0:c746ee34feae 55 // to do this is to poll the isr_tx() function while we
dannyman939 0:c746ee34feae 56 // are blocking.
dannyman939 0:c746ee34feae 57 isr_tx(false);
dannyman939 0:c746ee34feae 58 }
dannyman939 0:c746ee34feae 59 _IER = ier;
dannyman939 0:c746ee34feae 60 }
dannyman939 0:c746ee34feae 61 else if( MODSERIAL_TX_BUFFER_FULL ) {
dannyman939 0:c746ee34feae 62 buffer_overflow[TxIrq] = c; // Oh dear, no room in buffer.
dannyman939 0:c746ee34feae 63 _isr[TxOvIrq].call(&this->callbackInfo);
dannyman939 0:c746ee34feae 64 return -1;
dannyman939 0:c746ee34feae 65 }
dannyman939 0:c746ee34feae 66 _IER &= ~2;
dannyman939 0:c746ee34feae 67 buffer[TxIrq][buffer_in[TxIrq]] = c;
dannyman939 0:c746ee34feae 68 __disable_irq();
dannyman939 0:c746ee34feae 69 buffer_count[TxIrq]++;
dannyman939 0:c746ee34feae 70 __enable_irq();
dannyman939 0:c746ee34feae 71 buffer_in[TxIrq]++;
dannyman939 0:c746ee34feae 72 if (buffer_in[TxIrq] >= buffer_size[TxIrq]) {
dannyman939 0:c746ee34feae 73 buffer_in[TxIrq] = 0;
dannyman939 0:c746ee34feae 74 }
dannyman939 0:c746ee34feae 75 _IER |= 2;
dannyman939 0:c746ee34feae 76 }
dannyman939 0:c746ee34feae 77
dannyman939 0:c746ee34feae 78 return 0;
dannyman939 0:c746ee34feae 79 }
dannyman939 0:c746ee34feae 80
dannyman939 0:c746ee34feae 81 }; // namespace AjK ends