4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
33 * \author Andrea Grandi <andrea@develer.com>
35 * \brief Tag protocol (protocol).
37 * TAG protocol is decribed in this way:
39 * ---------------------------------------------------
40 * |STX (0x02)|data...(10 HEX chars)|CR|LF|ETX (0x03)|
41 * ---------------------------------------------------
47 #include <cfg/debug.h>
48 // Define log settings for cfg/log.h
49 #define LOG_LEVEL CONFIG_KEYTAG_LOG_LEVEL
50 #define LOG_FORMAT CONFIG_KEYTAG_LOG_FORMAT
52 #include <cfg/macros.h>
54 #include <kern/kfile.h>
57 * Starting communication char (STX).
62 * Ending communication char (ETX).
66 static void keytag_clearPkt(struct TagPacket *pkt)
72 void keytag_init(struct TagPacket *pkt, struct KFile *comm, struct KFile *tag)
79 void keytag_poll(struct TagPacket *pkt)
83 /* Get all chars from buffer */
84 while ((c = kfile_getc(pkt->tag)) != EOF)
86 /* Search for STX char in received chars */
89 /* When STX is found a new packet begins */
91 LOG_WARN("TAG double sync!\n");
97 /* Check for end of packet */
100 /* Terminate the tag string */
101 uint16_t len = MIN((uint16_t)CONFIG_TAG_MAX_LEN, pkt->len);
102 pkt->buf[len] = '\0';
103 /* Write read TAG on communication serial */
104 kfile_printf(pkt->host, "%s%s", CONFIG_TAG_LABEL, pkt->buf);
109 /* Check for buffer overflow */
110 if (pkt->len >= CONFIG_TAG_MAX_LEN)
112 LOG_ERR("TAG buffer overflow\n");
117 /* Add every char after STX to tag reading buffer */
120 pkt->buf[pkt->len] = c;
127 if (kfile_error(pkt->tag) != 0)
129 LOG_ERR("Error %08x\n", kfile_error(pkt->tag));
130 kfile_clearerr(pkt->tag);