Dhruv Bhatt / Mbed 2 deprecated final_proj1

Bank Account Security System

Dependencies:   FatFileSystemSD mbed

SerialBuffered.cpp@0:7e4786a3584b, 2012-10-11 (annotated)

Committer:
Dhruv_Varun
Date:
Thu Oct 11 20:49:25 2012 +0000
Revision:
0:7e4786a3584b
Code For Bank Account Security System

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Dhruv_Varun 0:7e4786a3584b 1 /**
Dhruv_Varun 0:7e4786a3584b 2 * =============================================================================
Dhruv_Varun 0:7e4786a3584b 3 * LS-Y201 device driver class (Version 0.0.1)
Dhruv_Varun 0:7e4786a3584b 4 * Reference documents: LinkSprite JPEG Color Camera Serial UART Interface
Dhruv_Varun 0:7e4786a3584b 5 * January 2010
Dhruv_Varun 0:7e4786a3584b 6 * =============================================================================
Dhruv_Varun 0:7e4786a3584b 7 * Copyright (c) 2010 Shinichiro Nakamura (CuBeatSystems)
Dhruv_Varun 0:7e4786a3584b 8 *
Dhruv_Varun 0:7e4786a3584b 9 * Permission is hereby granted, free of charge, to any person obtaining a copy
Dhruv_Varun 0:7e4786a3584b 10 * of this software and associated documentation files (the "Software"), to deal
Dhruv_Varun 0:7e4786a3584b 11 * in the Software without restriction, including without limitation the rights
Dhruv_Varun 0:7e4786a3584b 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Dhruv_Varun 0:7e4786a3584b 13 * copies of the Software, and to permit persons to whom the Software is
Dhruv_Varun 0:7e4786a3584b 14 * furnished to do so, subject to the following conditions:
Dhruv_Varun 0:7e4786a3584b 15 *
Dhruv_Varun 0:7e4786a3584b 16 * The above copyright notice and this permission notice shall be included in
Dhruv_Varun 0:7e4786a3584b 17 * all copies or substantial portions of the Software.
Dhruv_Varun 0:7e4786a3584b 18 *
Dhruv_Varun 0:7e4786a3584b 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Dhruv_Varun 0:7e4786a3584b 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Dhruv_Varun 0:7e4786a3584b 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Dhruv_Varun 0:7e4786a3584b 22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Dhruv_Varun 0:7e4786a3584b 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Dhruv_Varun 0:7e4786a3584b 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Dhruv_Varun 0:7e4786a3584b 25 * THE SOFTWARE.
Dhruv_Varun 0:7e4786a3584b 26 * =============================================================================
Dhruv_Varun 0:7e4786a3584b 27 */
Dhruv_Varun 0:7e4786a3584b 28
Dhruv_Varun 0:7e4786a3584b 29 #include "mbed.h"
Dhruv_Varun 0:7e4786a3584b 30 #include "SerialBuffered.h"
Dhruv_Varun 0:7e4786a3584b 31
Dhruv_Varun 0:7e4786a3584b 32 /**
Dhruv_Varun 0:7e4786a3584b 33 * Create a buffered serial class.
Dhruv_Varun 0:7e4786a3584b 34 *
Dhruv_Varun 0:7e4786a3584b 35 * @param tx A pin for transmit.
Dhruv_Varun 0:7e4786a3584b 36 * @param rx A pin for receive.
Dhruv_Varun 0:7e4786a3584b 37 */
Dhruv_Varun 0:7e4786a3584b 38 SerialBuffered::SerialBuffered(PinName tx, PinName rx) : Serial(tx, rx) {
Dhruv_Varun 0:7e4786a3584b 39 indexContentStart = 0;
Dhruv_Varun 0:7e4786a3584b 40 indexContentEnd = 0;
Dhruv_Varun 0:7e4786a3584b 41 timeout = 1;
Dhruv_Varun 0:7e4786a3584b 42 attach(this, &SerialBuffered::handleInterrupt);
Dhruv_Varun 0:7e4786a3584b 43 }
Dhruv_Varun 0:7e4786a3584b 44
Dhruv_Varun 0:7e4786a3584b 45 /**
Dhruv_Varun 0:7e4786a3584b 46 * Destroy.
Dhruv_Varun 0:7e4786a3584b 47 */
Dhruv_Varun 0:7e4786a3584b 48 SerialBuffered::~SerialBuffered() {
Dhruv_Varun 0:7e4786a3584b 49 }
Dhruv_Varun 0:7e4786a3584b 50
Dhruv_Varun 0:7e4786a3584b 51 /**
Dhruv_Varun 0:7e4786a3584b 52 * Set timeout for getc().
Dhruv_Varun 0:7e4786a3584b 53 *
Dhruv_Varun 0:7e4786a3584b 54 * @param ms milliseconds. (-1:Disable timeout)
Dhruv_Varun 0:7e4786a3584b 55 */
Dhruv_Varun 0:7e4786a3584b 56 void SerialBuffered::setTimeout(int ms) {
Dhruv_Varun 0:7e4786a3584b 57 timeout = ms;
Dhruv_Varun 0:7e4786a3584b 58 }
Dhruv_Varun 0:7e4786a3584b 59
Dhruv_Varun 0:7e4786a3584b 60 /**
Dhruv_Varun 0:7e4786a3584b 61 * Read requested bytes.
Dhruv_Varun 0:7e4786a3584b 62 *
Dhruv_Varun 0:7e4786a3584b 63 * @param bytes A pointer to a buffer.
Dhruv_Varun 0:7e4786a3584b 64 * @param requested Length.
Dhruv_Varun 0:7e4786a3584b 65 *
Dhruv_Varun 0:7e4786a3584b 66 * @return Readed byte length.
Dhruv_Varun 0:7e4786a3584b 67 */
Dhruv_Varun 0:7e4786a3584b 68 size_t SerialBuffered::readBytes(uint8_t *bytes, size_t requested) {
Dhruv_Varun 0:7e4786a3584b 69 int i = 0;
Dhruv_Varun 0:7e4786a3584b 70 while (i < requested) {
Dhruv_Varun 0:7e4786a3584b 71 int c = getc();
Dhruv_Varun 0:7e4786a3584b 72 if (c < 0) {
Dhruv_Varun 0:7e4786a3584b 73 break;
Dhruv_Varun 0:7e4786a3584b 74 }
Dhruv_Varun 0:7e4786a3584b 75 bytes[i] = c;
Dhruv_Varun 0:7e4786a3584b 76 i++;
Dhruv_Varun 0:7e4786a3584b 77 }
Dhruv_Varun 0:7e4786a3584b 78 return i;
Dhruv_Varun 0:7e4786a3584b 79 }
Dhruv_Varun 0:7e4786a3584b 80
Dhruv_Varun 0:7e4786a3584b 81 /**
Dhruv_Varun 0:7e4786a3584b 82 * Get a character.
Dhruv_Varun 0:7e4786a3584b 83 *
Dhruv_Varun 0:7e4786a3584b 84 * @return A character. (-1:timeout)
Dhruv_Varun 0:7e4786a3584b 85 */
Dhruv_Varun 0:7e4786a3584b 86 int SerialBuffered::getc() {
Dhruv_Varun 0:7e4786a3584b 87 timer.reset();
Dhruv_Varun 0:7e4786a3584b 88 timer.start();
Dhruv_Varun 0:7e4786a3584b 89 while (indexContentStart == indexContentEnd) {
Dhruv_Varun 0:7e4786a3584b 90 wait_ms(1);
Dhruv_Varun 0:7e4786a3584b 91 if ((timeout > 0) && (timer.read_ms() > timeout)) {
Dhruv_Varun 0:7e4786a3584b 92 /*
Dhruv_Varun 0:7e4786a3584b 93 * Timeout occured.
Dhruv_Varun 0:7e4786a3584b 94 */
Dhruv_Varun 0:7e4786a3584b 95 // printf("Timeout occured.\n");
Dhruv_Varun 0:7e4786a3584b 96 return EOF;
Dhruv_Varun 0:7e4786a3584b 97 }
Dhruv_Varun 0:7e4786a3584b 98 }
Dhruv_Varun 0:7e4786a3584b 99 timer.stop();
Dhruv_Varun 0:7e4786a3584b 100
Dhruv_Varun 0:7e4786a3584b 101 uint8_t result = buffer[indexContentStart++];
Dhruv_Varun 0:7e4786a3584b 102 indexContentStart = indexContentStart % BUFFERSIZE;
Dhruv_Varun 0:7e4786a3584b 103
Dhruv_Varun 0:7e4786a3584b 104 return result;
Dhruv_Varun 0:7e4786a3584b 105 }
Dhruv_Varun 0:7e4786a3584b 106
Dhruv_Varun 0:7e4786a3584b 107 /**
Dhruv_Varun 0:7e4786a3584b 108 * Returns 1 if there is a character available to read, 0 otherwise.
Dhruv_Varun 0:7e4786a3584b 109 */
Dhruv_Varun 0:7e4786a3584b 110 int SerialBuffered::readable() {
Dhruv_Varun 0:7e4786a3584b 111 return indexContentStart != indexContentEnd;
Dhruv_Varun 0:7e4786a3584b 112 }
Dhruv_Varun 0:7e4786a3584b 113
Dhruv_Varun 0:7e4786a3584b 114 void SerialBuffered::handleInterrupt() {
Dhruv_Varun 0:7e4786a3584b 115 while (Serial::readable()) {
Dhruv_Varun 0:7e4786a3584b 116 if (indexContentStart == ((indexContentEnd + 1) % BUFFERSIZE)) {
Dhruv_Varun 0:7e4786a3584b 117 /*
Dhruv_Varun 0:7e4786a3584b 118 * Buffer overrun occured.
Dhruv_Varun 0:7e4786a3584b 119 */
Dhruv_Varun 0:7e4786a3584b 120 // printf("Buffer overrun occured.\n");
Dhruv_Varun 0:7e4786a3584b 121 Serial::getc();
Dhruv_Varun 0:7e4786a3584b 122 } else {
Dhruv_Varun 0:7e4786a3584b 123 buffer[indexContentEnd++] = Serial::getc();
Dhruv_Varun 0:7e4786a3584b 124 indexContentEnd = indexContentEnd % BUFFERSIZE;
Dhruv_Varun 0:7e4786a3584b 125 }
Dhruv_Varun 0:7e4786a3584b 126 }
Dhruv_Varun 0:7e4786a3584b 127 }