CHE-WEI LIN / ATParser

Parser for AT commands and similar protocols

Dependencies:   BufferedSerial

ATParser.h@2:4d68f546861c, 2015-07-16 (annotated)

Committer:
geky
Date:
Thu Jul 16 22:50:43 2015 +0000
Revision:
2:4d68f546861c
Parent:
1:66a14afe650a
Child:
3:32915b9467d2
Fixed issue with uninitialized variable after failed scanf

Who changed what in which revision?

UserRevisionLine numberNew contents of line
geky 0:c741e144517c 1 /* Copyright (c) 2015 ARM Limited
geky 0:c741e144517c 2 *
geky 0:c741e144517c 3 * Licensed under the Apache License, Version 2.0 (the "License");
geky 0:c741e144517c 4 * you may not use this file except in compliance with the License.
geky 0:c741e144517c 5 * You may obtain a copy of the License at
geky 0:c741e144517c 6 *
geky 0:c741e144517c 7 * http://www.apache.org/licenses/LICENSE-2.0
geky 0:c741e144517c 8 *
geky 0:c741e144517c 9 * Unless required by applicable law or agreed to in writing, software
geky 0:c741e144517c 10 * distributed under the License is distributed on an "AS IS" BASIS,
geky 0:c741e144517c 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
geky 0:c741e144517c 12 * See the License for the specific language governing permissions and
geky 0:c741e144517c 13 * limitations under the License.
geky 0:c741e144517c 14 *
geky 0:c741e144517c 15 * @section DESCRIPTION
geky 0:c741e144517c 16 *
geky 0:c741e144517c 17 * Parser for the AT command syntax
geky 0:c741e144517c 18 *
geky 0:c741e144517c 19 */
geky 0:c741e144517c 20
geky 0:c741e144517c 21 #include "mbed.h"
geky 1:66a14afe650a 22 #include <stdarg.h>
geky 1:66a14afe650a 23
geky 1:66a14afe650a 24 #include "BufferedSerial.h"
geky 0:c741e144517c 25
geky 0:c741e144517c 26
geky 0:c741e144517c 27 /**
geky 0:c741e144517c 28 * The ATParser class wraps information about the serial in use
geky 0:c741e144517c 29 */
geky 0:c741e144517c 30 class ATParser {
geky 0:c741e144517c 31 private:
geky 0:c741e144517c 32 // Serial information
geky 1:66a14afe650a 33 BufferedSerial *_serial;
geky 0:c741e144517c 34 int _buffer_size;
geky 0:c741e144517c 35 char *_buffer;
geky 0:c741e144517c 36 int _timeout;
geky 0:c741e144517c 37
geky 2:4d68f546861c 38 // Parsing information
geky 2:4d68f546861c 39 const char *_delimiter;
geky 2:4d68f546861c 40
geky 0:c741e144517c 41 // Helper methods for putc/getc with timeout
geky 0:c741e144517c 42 int _putc(char c);
geky 0:c741e144517c 43 int _getc();
geky 0:c741e144517c 44
geky 0:c741e144517c 45 // Flush used to clear serial connection
geky 0:c741e144517c 46 void _flush();
geky 0:c741e144517c 47
geky 0:c741e144517c 48 // Helper methods for reading/writing lines with
geky 0:c741e144517c 49 // timeout and buffer limitations
geky 0:c741e144517c 50 bool _putline(const char *line);
geky 1:66a14afe650a 51 bool _getline(char *line, int size);
geky 0:c741e144517c 52
geky 0:c741e144517c 53 public:
geky 0:c741e144517c 54 /**
geky 0:c741e144517c 55 * Constructor
geky 0:c741e144517c 56 *
geky 0:c741e144517c 57 * @param serial serial interface to use for AT commands
geky 1:66a14afe650a 58 * @param buffer_size size of internal buffer for transaction
geky 0:c741e144517c 59 * @param timeout timeout of the connection
geky 1:66a14afe650a 60 * @param echo flag to indicate if an echo of sent characters should be expected
geky 2:4d68f546861c 61 * @param delimiter string of characters to use as line delimiters
geky 0:c741e144517c 62 */
geky 2:4d68f546861c 63 ATParser(BufferedSerial *serial, int buffer_size = 256, int timeout = 3000,
geky 2:4d68f546861c 64 const char *delimiter = "\r\n") :
geky 0:c741e144517c 65 _serial(serial),
geky 0:c741e144517c 66 _buffer_size(buffer_size),
geky 2:4d68f546861c 67 _timeout(timeout),
geky 2:4d68f546861c 68 _delimiter(delimiter) {
geky 0:c741e144517c 69 _buffer = new char[buffer_size];
geky 0:c741e144517c 70 }
geky 0:c741e144517c 71
geky 0:c741e144517c 72 /**
geky 0:c741e144517c 73 * Destructor
geky 0:c741e144517c 74 */
geky 0:c741e144517c 75 ~ATParser() {
geky 0:c741e144517c 76 delete [] _buffer;
geky 0:c741e144517c 77 }
geky 0:c741e144517c 78
geky 0:c741e144517c 79 /**
geky 0:c741e144517c 80 * Allows timeout to be changed between commands
geky 0:c741e144517c 81 *
geky 0:c741e144517c 82 * @param timeout timeout of the connection
geky 0:c741e144517c 83 */
geky 0:c741e144517c 84 void setTimeout(int timeout) {
geky 0:c741e144517c 85 _timeout = timeout;
geky 0:c741e144517c 86 }
geky 2:4d68f546861c 87
geky 2:4d68f546861c 88 /**
geky 2:4d68f546861c 89 * Sets string of characters to use as line delimiters
geky 2:4d68f546861c 90 *
geky 2:4d68f546861c 91 * @param delimiter string of characters to use as line delimiters
geky 2:4d68f546861c 92 */
geky 2:4d68f546861c 93 void setDelimiter(const char *delimiter) {
geky 2:4d68f546861c 94 _delimiter = delimiter;
geky 2:4d68f546861c 95 }
geky 0:c741e144517c 96
geky 0:c741e144517c 97 /**
geky 2:4d68f546861c 98 * Issue AT commands
geky 2:4d68f546861c 99 *
geky 2:4d68f546861c 100 * Sends formatted command and waits for formatted response.
geky 2:4d68f546861c 101 * Any recieved data that does not match the specified response
geky 2:4d68f546861c 102 * is ignored until the timeout has passed.
geky 2:4d68f546861c 103 *
geky 2:4d68f546861c 104 * Both the command and response use format strings that are internally
geky 2:4d68f546861c 105 * passed to printf and scanf respectively.
geky 2:4d68f546861c 106 * @see printf
geky 2:4d68f546861c 107 * @see scanf
geky 2:4d68f546861c 108 *
geky 2:4d68f546861c 109 * Commands are expected to be formatted with specified delimiters.
geky 2:4d68f546861c 110 * Sent commands are appended with the delimiter, and responses are
geky 2:4d68f546861c 111 * seperated by delimiters before attempting to parse.
geky 1:66a14afe650a 112 *
geky 1:66a14afe650a 113 * Here are some examples:
geky 1:66a14afe650a 114 * @code
geky 1:66a14afe650a 115 * at.command("AT", "OK");
geky 1:66a14afe650a 116 * at.command("AT+CWMODE=%d", "OK", 3);
geky 2:4d68f546861c 117 * at.command("AT+CWMODE?", "+CWMODE:%d\r\nOK", &result);
geky 1:66a14afe650a 118 * @endcode
geky 0:c741e144517c 119 *
geky 0:c741e144517c 120 * @param command printf-like format string of command to send
geky 0:c741e144517c 121 * @param response scanf-like format string of response to parse
geky 0:c741e144517c 122 * @param ... all printf-like arguments to insert into command followed by
geky 0:c741e144517c 123 * all scanf-like pointers to destinations for response values
geky 1:66a14afe650a 124 * @return true only if response is successfully matched
geky 0:c741e144517c 125 */
geky 0:c741e144517c 126 bool command(const char *command, const char *response, ...);
geky 0:c741e144517c 127 };
geky 1:66a14afe650a 128