gsmgnss

---

GSM/GNSS Click

GSM GNSS Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

---

Click Library

• Author : MikroE Team
• Date : apr 2020.
• Type : UART type

Software Support

Example Description

This example reads and processes data from GSM/GNSS Clicks.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.GsmGnss

Example Key Functions

• gsmgnss_cfg_setup Config Object Initialization function.

void gsmgnss_cfg_setup ( gsmgnss_cfg_t *cfg );

• gsmgnss_init Initialization function.

err_t gsmgnss_init ( gsmgnss_t *ctx, gsmgnss_cfg_t *cfg );

• gsmgnss_module_power Power ON/OFF the module.

void gsmgnss_module_power ( gsmgnss_t *ctx, uint8_t state );

• gsmgnss_send_cmd Send command function.

void gsmgnss_send_cmd ( gsmgnss_t *ctx, char *cmd );

• gsmgnss_set_sim_apn Set sim card APN.

void gsmgnss_set_sim_apn ( gsmgnss_t *ctx, char *sim_apn );

• gsmgnss_send_sms_pdu GSM GNSS send SMS in PDU mode.

err_t gsmgnss_send_sms_pdu ( gsmgnss_t *ctx, char *service_center_number, char *phone_number, char *sms_text );

Application Init

Initializes the driver and powers up the module, then sets default configuration for connecting the device to network.

void application_init ( void )
{
    log_cfg_t log_cfg;
    gsmgnss_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    gsmgnss_cfg_setup( &cfg );
    GSMGNSS_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    gsmgnss_init( &gsmgnss, &cfg );

    gsmgnss_module_power( &gsmgnss, GSMGNSS_MODULE_POWER_ON );
    
    // dummy read
    gsmgnss_process( );
    gsmgnss_clear_app_buf( );
    
    // AT
    gsmgnss_send_cmd( &gsmgnss, GSMGNSS_CMD_AT );
    app_error_flag = gsmgnss_rsp_check( );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // ATI - product information
    gsmgnss_send_cmd( &gsmgnss, GSMGNSS_CMD_ATI );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // CGMR - firmware version
    gsmgnss_send_cmd( &gsmgnss, GSMGNSS_CMD_CGMR );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // CMEE - Report Mobile Equipment Error
    gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_CMEE, "2" );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // COPS - deregister from network
    gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_COPS, "2" );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // CGDCONT - set sim apn
    gsmgnss_set_sim_apn( &gsmgnss, SIM_APN );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // CFUN - full funtionality
    gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_CFUN, "1" );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // COPS - automatic mode
    gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_COPS, "0" );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    // CREG - network registration status
    gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_CREG, "1" );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    // QGNSSC - power ON GNSS
    gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_QGNSSC, "1" );
    app_error_flag = gsmgnss_rsp_check(  );
    gsmgnss_error_check( app_error_flag );
    Delay_ms ( 500 );
    
    app_buf_len = 0;
    app_buf_cnt = 0;
    app_connection_status = WAIT_FOR_CONNECTION;
    log_info( &logger, " Application Task " );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

Application Task

Waits for the device to connect to network, then waits for the GNSS position fix. Once it get a fix, it sends an SMS with GNSS info to the selected phone number approximately every 40 seconds.

void application_task ( void )
{
    if ( app_connection_status == WAIT_FOR_CONNECTION )
    {
        // CREG - network registration status
        gsmgnss_send_cmd_check( &gsmgnss, GSMGNSS_CMD_CREG );
        app_error_flag = gsmgnss_rsp_check(  );
        gsmgnss_error_check( app_error_flag );
        Delay_ms ( 500 );
        
        // CSQ - signal quality
        gsmgnss_send_cmd( &gsmgnss, GSMGNSS_CMD_CSQ );
        app_error_flag = gsmgnss_rsp_check(  );
        gsmgnss_error_check( app_error_flag );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
    else
    {
        log_info( &logger, "CONNECTED TO NETWORK" );
        
        // SMS message format - PDU mode
        gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_CMGF, "0" );
        app_error_flag = gsmgnss_rsp_check(  );
        gsmgnss_error_check( app_error_flag );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        
        for( ; ; )
        {   
            // Get GNSS info
            gnss_parser_flag = 1;
            gsmgnss_send_cmd_with_parameter( &gsmgnss, GSMGNSS_CMD_QGNSSRD, "\"NMEA/GGA\"" );
            app_error_flag = gsmgnss_rsp_check(  );
            gsmgnss_error_check( app_error_flag );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            
            if ( gnss_parser_flag == 0 )
            {
                log_printf( &logger, "> Sending message to phone number...\r\n" );
                gsmgnss_send_sms_pdu ( &gsmgnss, SIM_SMSC, PHONE_NUMBER_TO_MESSAGE, gnss_info_message );
                app_error_flag = gsmgnss_rsp_check(  );
                gsmgnss_error_check( app_error_flag );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
                Delay_ms ( 1000 );
            }
        }
    }
}

Note

A passive GPS antenna is required for the GNSS to receive the position fix. It may take several minutes for the module to receive the fix. In order for the example to work, user needs to set the phone number to which he wants to send an SMS, and also will need to set an APN and SMSC (required for PDU mode only) of entered SIM card. Enter valid data for the following macros: SIM_APN, SIM_SMSC and PHONE_NUMBER_TO_MESSAGE.

E.g.

• SIM_APN "vipmobile"
• SIM_SMSC "+381610401"
• PHONE_NUMBER_TO_MESSAGE "+381659999999"

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

---