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Diffstat (limited to 'bta/ag/bta_ag_at.c')
| -rw-r--r-- | bta/ag/bta_ag_at.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/bta/ag/bta_ag_at.c b/bta/ag/bta_ag_at.c new file mode 100644 index 0000000..74d3948 --- /dev/null +++ b/bta/ag/bta_ag_at.c @@ -0,0 +1,243 @@ +/****************************************************************************** + * + * Copyright (C) 2004-2012 Broadcom Corporation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + ******************************************************************************/ + +/****************************************************************************** + * + * BTA AG AT command interpreter. + * + ******************************************************************************/ + +#include <string.h> +#include "gki.h" +#include "bta_ag_at.h" +#include "utl.h" + +/***************************************************************************** +** Constants +*****************************************************************************/ + +/****************************************************************************** +** +** Function bta_ag_at_init +** +** Description Initialize the AT command parser control block. +** +** +** Returns void +** +******************************************************************************/ +void bta_ag_at_init(tBTA_AG_AT_CB *p_cb) +{ + p_cb->p_cmd_buf = NULL; + p_cb->cmd_pos = 0; +} + +/****************************************************************************** +** +** Function bta_ag_at_reinit +** +** Description Re-initialize the AT command parser control block. This +** function resets the AT command parser state and frees +** any GKI buffer. +** +** +** Returns void +** +******************************************************************************/ +void bta_ag_at_reinit(tBTA_AG_AT_CB *p_cb) +{ + if (p_cb->p_cmd_buf != NULL) + { + GKI_freebuf(p_cb->p_cmd_buf); + p_cb->p_cmd_buf = NULL; + } + p_cb->cmd_pos = 0; +} +/****************************************************************************** +** +** Function bta_ag_process_at +** +** Description Parse AT commands. This function will take the input +** character string and parse it for AT commands according to +** the AT command table passed in the control block. +** +** +** Returns void +** +******************************************************************************/ +void bta_ag_process_at(tBTA_AG_AT_CB *p_cb) +{ + UINT16 idx; + UINT8 arg_type; + char *p_arg; + INT16 int_arg = 0; + /* loop through at command table looking for match */ + for (idx = 0; p_cb->p_at_tbl[idx].p_cmd[0] != 0; idx++) + { + if (!utl_strucmp(p_cb->p_at_tbl[idx].p_cmd, p_cb->p_cmd_buf)) + { + break; + } + } + + /* if there is a match; verify argument type */ + if (p_cb->p_at_tbl[idx].p_cmd[0] != 0) + { + /* start of argument is p + strlen matching command */ + p_arg = p_cb->p_cmd_buf + strlen(p_cb->p_at_tbl[idx].p_cmd); + + /* if no argument */ + if (p_arg[0] == 0) + { + arg_type = BTA_AG_AT_NONE; + } + /* else if arg is '?' and it is last character */ + else if (p_arg[0] == '?' && p_arg[1] == 0) + { + /* we have a read */ + arg_type = BTA_AG_AT_READ; + } + /* else if arg is '=' */ + else if (p_arg[0] == '=' && p_arg[1] != 0) + { + if (p_arg[1] == '?' && p_arg[2] == 0) + { + /* we have a test */ + arg_type = BTA_AG_AT_TEST; + } + else + { + /* we have a set */ + arg_type = BTA_AG_AT_SET; + + /* skip past '=' */ + p_arg++; + } + } + else + /* else it is freeform argument */ + { + arg_type = BTA_AG_AT_FREE; + } + + /* if arguments match command capabilities */ + if ((arg_type & p_cb->p_at_tbl[idx].arg_type) != 0) + { + /* if it's a set integer check max, min range */ + if (arg_type == BTA_AG_AT_SET && + p_cb->p_at_tbl[idx].fmt == BTA_AG_AT_INT) + { + int_arg = utl_str2int(p_arg); + if (int_arg < (INT16) p_cb->p_at_tbl[idx].min || + int_arg > (INT16) p_cb->p_at_tbl[idx].max) + { + /* arg out of range; error */ + (*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL); + } + else + { + + (*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg); + } + } + else + { + (*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg); + } + } + /* else error */ + else + { + (*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL); + } + } + /* else no match call error callback */ + else + { + (*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf); + } +} + +/****************************************************************************** +** +** Function bta_ag_at_parse +** +** Description Parse AT commands. This function will take the input +** character string and parse it for AT commands according to +** the AT command table passed in the control block. +** +** +** Returns void +** +******************************************************************************/ +void bta_ag_at_parse(tBTA_AG_AT_CB *p_cb, char *p_buf, UINT16 len) +{ + int i = 0; + char* p_save; + + if (p_cb->p_cmd_buf == NULL) + { + p_cb->p_cmd_buf = (char *) GKI_getbuf(p_cb->cmd_max_len); + p_cb->cmd_pos = 0; + } + + for (i = 0; i < len;) + { + while (p_cb->cmd_pos < p_cb->cmd_max_len-1 && i < len) + { + /* Skip null characters between AT commands. */ + if ((p_cb->cmd_pos == 0) && (p_buf[i] == 0)) + { + i++; + continue; + } + + p_cb->p_cmd_buf[p_cb->cmd_pos] = p_buf[i++]; + if ( p_cb->p_cmd_buf[p_cb->cmd_pos] == '\r' || p_cb->p_cmd_buf[p_cb->cmd_pos] == '\n') + { + p_cb->p_cmd_buf[p_cb->cmd_pos] = 0; + if ((p_cb->cmd_pos > 2) && + (p_cb->p_cmd_buf[0] == 'A' || p_cb->p_cmd_buf[0] == 'a') && + (p_cb->p_cmd_buf[1] == 'T' || p_cb->p_cmd_buf[1] == 't')) + { + p_save = p_cb->p_cmd_buf; + p_cb->p_cmd_buf += 2; + bta_ag_process_at(p_cb); + p_cb->p_cmd_buf = p_save; + } + + p_cb->cmd_pos = 0; + + } + else if( p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1A || p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1B ) + { + p_cb->p_cmd_buf[++p_cb->cmd_pos] = 0; + (*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf); + p_cb->cmd_pos = 0; + } + else + { + ++p_cb->cmd_pos; + } + } + + if (i < len) + p_cb->cmd_pos = 0; + } +} + |