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Open AT ® Release version:
C-GPS Plug-in 100
| http://www.wavecom.com/forum Open AT ® Release version: C-GPS Plug-in 100 |
This application provides the PVT data to the user when a configuration SMS is sent to it.
The configuration SMS provides the phone number on which the PVT data should be sent.
The application gathers the PVT data using the C-GPS chipset.
Important Note:
1. To execute the sample, the C-GPS feature must be enabled in the Wireless CPU. If the feature is not enabled, and an attempt is made to execute the application (using AT+WOPEN=1 command), the application responds with a +CME ERROR: 4 (Operation Not Supported). Only when the C-GPS feature is enabled, the application provides the desired functionality.
2. If the sample is to be executed in RTE Mode, then the COM port speed using which the Wireless CPU is connected to the PC must be set to 460800 bauds/second.
3. When the sample is to be executed in RTE mode, the user must define a macro called RTE_PRODUCT_TYPE in the file "gpioconfig.h". This macro should represent the Wireless CPU being used. For instance, if Q2686 is being used, the macro should be defined as:
#ifdef __REMOTETASKS__
/* Define the product type only for RTE mode */
/* ADL_IO_PRODUCT_TYPE_Q2686 or ADL_IO_PRODUCT_TYPE_Q2687 */
#define RTE_PRODUCT_TYPE ADL_IO_PRODUCT_TYPE_Q2686
#endif
The application uses some custom commands which are used to start the application and/or configure the behaviour of the application.
AT+NMEA (Configure the Debug UART)
| Command | Answers |
| AT+NMEA? | +NMEA:
<value>
OK |
| AT+NMEA=? | +NMEA:
(0-2)
OK |
| AT+NMEA= <value> | +CME ERROR: 3 or OK |
| Parameter | Values range | Description | Default value |
| value | 0-2 | 0: Specifies that the NMEA frames should not be sent to the Debug UART. 1: Specifies that the NMEA frames should be sent to the Debug UART in standard format. 2: Specifies that RAW NMEA frames should be sent to the Debug UART. | 0 |
The value parameter specifies whether the NMEA frames are sent over the Debug UART (UART which is not used by C-GPS board) or not.
AT+PASSWORD (Configuration SMS Password)
| Command | Answers |
| AT+PASSWORD? | +PASSWORD:
<pwd>
OK |
| AT+PASSWORD=? | +PASSWORD:
(String of maximum 20 characters)
OK |
| AT+PASSWORD= <pwd> | +CME ERROR: 3 or OK |
| Parameter | Values range | Description | Default value |
| pwd | String of maximum 20 characters | 0: Specifies that the NMEA frames should not be sent to the Debug UART. 1: Specifies that the NMEA frames should be sent to the Debug UART in standard format. 2: Specifies that RAW NMEA frames should be sent to the Debug UART. | CGPS |
This command specifies the password which is used to validate a correct configuration SMS. The configuration SMS must provide the correct password to be able to received the PVT information. The password is case sensitive. This password is stored in Flash memory and hence once saved the new password takes its effect until the flash objects are deleted or the password is deliberately changed.
AT+CGPS (C-GPS UART Selection Command.)
| Command | Answers |
| AT+CGPS? | +CGPS:
<value>
OK |
| AT+CGPS=? | +CGPS:
(1-2)
OK |
| AT+CGPS= <value> | +CME ERROR: 3 or OK |
| Parameter | Values range | Description | Default value |
| value | 1-2 | 1: UART 1 is used by C-GPS chipset (daughter board). UART 2 becomes the Debug UART. 2: UART 2 is used by C-GPS chipset (daughter board). UART 1 becomes the Debug UART. | 0 |
The value parameter specifies the UART which is to be used by the C-GPS chipset for communication with Wavecom Wireless CPU. The UART which is left out becomes the Debug UART over which the Debug NMEA frames and/or traces can be received and AT commands can be sent.
AT+CONFIG (Command to save previously set configuration.)
| Command | Answers |
| AT+CONFIG? | +CONFIG:
<value>
OK |
| AT+CONFIG=? | +CONFIG:
(0-1)
OK |
| AT+CONFIG= <value> | +CME ERROR: 3 or OK |
| Parameter | Values range | Description | Default value |
| value | 0-1 | 0: The application should not save the +NMEA setting and the UART used for C-GPS. 1. The application saves the +NMEA setting and the UART used for C-GPS. Hence, if the Wireless CPU resets, the application would use the previously saved values and the C-GPS chipset (daughter board) would start working. | 0 |
This command indicates whether the application save the +NMEA setting (set using AT+NMEA command) and the UART to be used for C-GPS (GPS UART) or not.
NOTE
1. The command AT+CONFIG should be given after specifying the parameters for +NMEA and +CGPS commands. If the user wants that the application should not automatically start when the Wireless CPU resets, the command AT+CONFIG = 0 should be given and the Wireless CPU should be reset.
2. To start the application for the first time, specify the +NMEA setting, and then specify the UART which is to be used for C-GPS chipset (daughter board). The application starts only when the C-GPS chipset is initialized and this is done when the user specifies the AT+CGPS command.
To retrieve the PVT information, the user has to send a configuration SMS to the Wireless CPU where the Query Application is in execution.
The Configuration SMS should have the following format:
INFO:"Password":"Phonenumber"
where the fields have the following values:
-> Password: This is the Password which is configured using AT+PASSWORD command. The default value of the password is CGPS
-> Phonenumber: This is the optional field which conveys the phone number to which the PVT information is sent. If the phone number is missing, the information is sent to the number from which the configuration SMS has been received.
Updated: Thu Nov 23 10:35:27 CET 2006;