Derek Fukumori / MODSERIAL

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of MODSERIAL by Andy K

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

Committer:
dfukumori
Date:
Fri Jul 13 01:09:23 2012 +0000
Revision:
23:1236d0b64e71
Parent:
0:eb2522b41db8 
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::resizeBuffer(int size, IrqType type, bool memory_check)
dfukumori 23:1236d0b64e71 30 {
dfukumori 23:1236d0b64e71 31 int rval = Ok;
dfukumori 23:1236d0b64e71 32
dfukumori 23:1236d0b64e71 33 // If the requested size is the same as the current size there's nothing to do,
dfukumori 23:1236d0b64e71 34 // just continue to use the same buffer as it's fine as it is.
dfukumori 23:1236d0b64e71 35 if (buffer_size[type] == size) return rval;
dfukumori 23:1236d0b64e71 36
dfukumori 23:1236d0b64e71 37 // Make sure the ISR cannot use the buffers while we are manipulating them.
dfukumori 23:1236d0b64e71 38 disableIrq();
dfukumori 23:1236d0b64e71 39
dfukumori 23:1236d0b64e71 40 // If the requested buffer size is larger than the current size,
dfukumori 23:1236d0b64e71 41 // attempt to create a new buffer and use it.
dfukumori 23:1236d0b64e71 42 if (buffer_size[type] < size) {
dfukumori 23:1236d0b64e71 43 rval = upSizeBuffer(size, type, memory_check);
dfukumori 23:1236d0b64e71 44 }
dfukumori 23:1236d0b64e71 45 else if (buffer_size[type] > size) {
dfukumori 23:1236d0b64e71 46 rval = downSizeBuffer(size, type, memory_check);
dfukumori 23:1236d0b64e71 47 }
dfukumori 23:1236d0b64e71 48
dfukumori 23:1236d0b64e71 49 // Start the ISR system again with the new buffers.
dfukumori 23:1236d0b64e71 50 enableIrq();
dfukumori 23:1236d0b64e71 51
dfukumori 23:1236d0b64e71 52 return rval;
dfukumori 23:1236d0b64e71 53 }
dfukumori 23:1236d0b64e71 54
dfukumori 23:1236d0b64e71 55 int
dfukumori 23:1236d0b64e71 56 MODSERIAL::downSizeBuffer(int size, IrqType type, bool memory_check)
dfukumori 23:1236d0b64e71 57 {
dfukumori 23:1236d0b64e71 58 if (size >= buffer_count[type]) {
dfukumori 23:1236d0b64e71 59 return BufferOversize;
dfukumori 23:1236d0b64e71 60 }
dfukumori 23:1236d0b64e71 61
dfukumori 23:1236d0b64e71 62 char *s = (char *)malloc(size);
dfukumori 23:1236d0b64e71 63
dfukumori 23:1236d0b64e71 64 if (s == (char *)NULL) {
dfukumori 23:1236d0b64e71 65 if (memory_check) {
dfukumori 23:1236d0b64e71 66 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX");
dfukumori 23:1236d0b64e71 67 }
dfukumori 23:1236d0b64e71 68 return NoMemory;
dfukumori 23:1236d0b64e71 69 }
dfukumori 23:1236d0b64e71 70
dfukumori 23:1236d0b64e71 71 int c, new_in = 0;
dfukumori 23:1236d0b64e71 72
dfukumori 23:1236d0b64e71 73 do {
dfukumori 23:1236d0b64e71 74 c = __getc(false);
dfukumori 23:1236d0b64e71 75 if (c != -1) s[new_in++] = (char)c;
dfukumori 23:1236d0b64e71 76 if (new_in >= size) new_in = 0;
dfukumori 23:1236d0b64e71 77 }
dfukumori 23:1236d0b64e71 78 while (c != -1);
dfukumori 23:1236d0b64e71 79
dfukumori 23:1236d0b64e71 80 free((char *)buffer[type]);
dfukumori 23:1236d0b64e71 81 buffer[type] = s;
dfukumori 23:1236d0b64e71 82 buffer_in[type] = new_in;
dfukumori 23:1236d0b64e71 83 buffer_out[type] = 0;
dfukumori 23:1236d0b64e71 84 return Ok;
dfukumori 23:1236d0b64e71 85 }
dfukumori 23:1236d0b64e71 86
dfukumori 23:1236d0b64e71 87 int
dfukumori 23:1236d0b64e71 88 MODSERIAL::upSizeBuffer(int size, IrqType type, bool memory_check)
dfukumori 23:1236d0b64e71 89 {
dfukumori 23:1236d0b64e71 90 char *s = (char *)malloc(size);
dfukumori 23:1236d0b64e71 91
dfukumori 23:1236d0b64e71 92 if (s == (char *)NULL) {
dfukumori 23:1236d0b64e71 93 if (memory_check) {
dfukumori 23:1236d0b64e71 94 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX");
dfukumori 23:1236d0b64e71 95 }
dfukumori 23:1236d0b64e71 96 return NoMemory;
dfukumori 23:1236d0b64e71 97 }
dfukumori 23:1236d0b64e71 98
dfukumori 23:1236d0b64e71 99 if (buffer_count[type] == 0) { // Current buffer empty?
dfukumori 23:1236d0b64e71 100 free((char *)buffer[type]);
dfukumori 23:1236d0b64e71 101 buffer[type] = s;
dfukumori 23:1236d0b64e71 102 buffer_in[type] = 0;
dfukumori 23:1236d0b64e71 103 buffer_out[type] = 0;
dfukumori 23:1236d0b64e71 104 }
dfukumori 23:1236d0b64e71 105 else { // Copy the current contents into the new buffer.
dfukumori 23:1236d0b64e71 106 int c, new_in = 0;
dfukumori 23:1236d0b64e71 107 do {
dfukumori 23:1236d0b64e71 108 c = __getc(false);
dfukumori 23:1236d0b64e71 109 if (c != -1) s[new_in++] = (char)c;
dfukumori 23:1236d0b64e71 110 if (new_in >= size) new_in = 0; // Shouldn't happen, but be sure.
dfukumori 23:1236d0b64e71 111 }
dfukumori 23:1236d0b64e71 112 while (c != -1);
dfukumori 23:1236d0b64e71 113 free((char *)buffer[type]);
dfukumori 23:1236d0b64e71 114 buffer[type] = s;
dfukumori 23:1236d0b64e71 115 buffer_in[type] = new_in;
dfukumori 23:1236d0b64e71 116 buffer_out[type] = 0;
dfukumori 23:1236d0b64e71 117 }
dfukumori 23:1236d0b64e71 118
dfukumori 23:1236d0b64e71 119 buffer_size[type] = size;
dfukumori 23:1236d0b64e71 120 return Ok;
dfukumori 23:1236d0b64e71 121 }
dfukumori 23:1236d0b64e71 122
dfukumori 23:1236d0b64e71 123 }; // namespace AjK ends