james kain / Mbed 2 deprecated GPS_Incremental

JEK changes enabling proper recording of IMU/GPS datastrams - 02-APR-2013

Dependencies:   mbed

Fork of GPS_Incremental by Dan Matthews

MODSERIAL/RESIZE.cpp@9:b45feb91ba38, 2013-04-19 (annotated)

Committer:
jekain314
Date:
Fri Apr 19 16:21:27 2013 +0000
Revision:
9:b45feb91ba38
Parent:
0:c746ee34feae 
update to allow better imu gps data collection

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::resizeBuffer(int size, IrqType type, bool memory_check)
dannyman939 0:c746ee34feae 30 {
dannyman939 0:c746ee34feae 31 int rval = Ok;
dannyman939 0:c746ee34feae 32
dannyman939 0:c746ee34feae 33 // If the requested size is the same as the current size there's nothing to do,
dannyman939 0:c746ee34feae 34 // just continue to use the same buffer as it's fine as it is.
dannyman939 0:c746ee34feae 35 if (buffer_size[type] == size) return rval;
dannyman939 0:c746ee34feae 36
dannyman939 0:c746ee34feae 37 // Make sure the ISR cannot use the buffers while we are manipulating them.
dannyman939 0:c746ee34feae 38 disableIrq();
dannyman939 0:c746ee34feae 39
dannyman939 0:c746ee34feae 40 // If the requested buffer size is larger than the current size,
dannyman939 0:c746ee34feae 41 // attempt to create a new buffer and use it.
dannyman939 0:c746ee34feae 42 if (buffer_size[type] < size) {
dannyman939 0:c746ee34feae 43 rval = upSizeBuffer(size, type, memory_check);
dannyman939 0:c746ee34feae 44 }
dannyman939 0:c746ee34feae 45 else if (buffer_size[type] > size) {
dannyman939 0:c746ee34feae 46 rval = downSizeBuffer(size, type, memory_check);
dannyman939 0:c746ee34feae 47 }
dannyman939 0:c746ee34feae 48
dannyman939 0:c746ee34feae 49 // Start the ISR system again with the new buffers.
dannyman939 0:c746ee34feae 50 enableIrq();
dannyman939 0:c746ee34feae 51
dannyman939 0:c746ee34feae 52 return rval;
dannyman939 0:c746ee34feae 53 }
dannyman939 0:c746ee34feae 54
dannyman939 0:c746ee34feae 55 int
dannyman939 0:c746ee34feae 56 MODSERIAL::downSizeBuffer(int size, IrqType type, bool memory_check)
dannyman939 0:c746ee34feae 57 {
dannyman939 0:c746ee34feae 58 if (size >= buffer_count[type]) {
dannyman939 0:c746ee34feae 59 return BufferOversize;
dannyman939 0:c746ee34feae 60 }
dannyman939 0:c746ee34feae 61
dannyman939 0:c746ee34feae 62 char *s = (char *)malloc(size);
dannyman939 0:c746ee34feae 63
dannyman939 0:c746ee34feae 64 if (s == (char *)NULL) {
dannyman939 0:c746ee34feae 65 if (memory_check) {
dannyman939 0:c746ee34feae 66 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX");
dannyman939 0:c746ee34feae 67 }
dannyman939 0:c746ee34feae 68 return NoMemory;
dannyman939 0:c746ee34feae 69 }
dannyman939 0:c746ee34feae 70
dannyman939 0:c746ee34feae 71 int c, new_in = 0;
dannyman939 0:c746ee34feae 72
dannyman939 0:c746ee34feae 73 do {
dannyman939 0:c746ee34feae 74 c = __getc(false);
dannyman939 0:c746ee34feae 75 if (c != -1) s[new_in++] = (char)c;
dannyman939 0:c746ee34feae 76 if (new_in >= size) new_in = 0;
dannyman939 0:c746ee34feae 77 }
dannyman939 0:c746ee34feae 78 while (c != -1);
dannyman939 0:c746ee34feae 79
dannyman939 0:c746ee34feae 80 free((char *)buffer[type]);
dannyman939 0:c746ee34feae 81 buffer[type] = s;
dannyman939 0:c746ee34feae 82 buffer_in[type] = new_in;
dannyman939 0:c746ee34feae 83 buffer_out[type] = 0;
dannyman939 0:c746ee34feae 84 return Ok;
dannyman939 0:c746ee34feae 85 }
dannyman939 0:c746ee34feae 86
dannyman939 0:c746ee34feae 87 int
dannyman939 0:c746ee34feae 88 MODSERIAL::upSizeBuffer(int size, IrqType type, bool memory_check)
dannyman939 0:c746ee34feae 89 {
dannyman939 0:c746ee34feae 90 char *s = (char *)malloc(size);
dannyman939 0:c746ee34feae 91
dannyman939 0:c746ee34feae 92 if (s == (char *)NULL) {
dannyman939 0:c746ee34feae 93 if (memory_check) {
dannyman939 0:c746ee34feae 94 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX");
dannyman939 0:c746ee34feae 95 }
dannyman939 0:c746ee34feae 96 return NoMemory;
dannyman939 0:c746ee34feae 97 }
dannyman939 0:c746ee34feae 98
dannyman939 0:c746ee34feae 99 if (buffer_count[type] == 0) { // Current buffer empty?
dannyman939 0:c746ee34feae 100 free((char *)buffer[type]);
dannyman939 0:c746ee34feae 101 buffer[type] = s;
dannyman939 0:c746ee34feae 102 buffer_in[type] = 0;
dannyman939 0:c746ee34feae 103 buffer_out[type] = 0;
dannyman939 0:c746ee34feae 104 }
dannyman939 0:c746ee34feae 105 else { // Copy the current contents into the new buffer.
dannyman939 0:c746ee34feae 106 int c, new_in = 0;
dannyman939 0:c746ee34feae 107 do {
dannyman939 0:c746ee34feae 108 c = __getc(false);
dannyman939 0:c746ee34feae 109 if (c != -1) s[new_in++] = (char)c;
dannyman939 0:c746ee34feae 110 if (new_in >= size) new_in = 0; // Shouldn't happen, but be sure.
dannyman939 0:c746ee34feae 111 }
dannyman939 0:c746ee34feae 112 while (c != -1);
dannyman939 0:c746ee34feae 113 free((char *)buffer[type]);
dannyman939 0:c746ee34feae 114 buffer[type] = s;
dannyman939 0:c746ee34feae 115 buffer_in[type] = new_in;
dannyman939 0:c746ee34feae 116 buffer_out[type] = 0;
dannyman939 0:c746ee34feae 117 }
dannyman939 0:c746ee34feae 118
dannyman939 0:c746ee34feae 119 buffer_size[type] = size;
dannyman939 0:c746ee34feae 120 return Ok;
dannyman939 0:c746ee34feae 121 }
dannyman939 0:c746ee34feae 122
dannyman939 0:c746ee34feae 123 }; // namespace AjK ends