micrfrx

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MICRF RX Click

MICRF RX 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.

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Click Library

• Author : Stefan Filipovic
• Date : Nov 2023.
• Type : GPIO type

Software Support

Example Description

This example demonstrates the use of MICRF RX Click board by reading and parsing packet messages received from the transmitter.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.MICRFRX

Example Key Functions

• micrfrx_cfg_setup Config Object Initialization function.

void micrfrx_cfg_setup ( micrfrx_cfg_t *cfg );

• micrfrx_init Initialization function.

err_t micrfrx_init ( micrfrx_t *ctx, micrfrx_cfg_t *cfg );

• micrfrx_enable_device This function enables device by setting the SHD pin to low logic state.

void micrfrx_enable_device ( micrfrx_t *ctx );

• micrfrx_wait_ready This function waits for all training bytes to arrive which indicates data ready.

static void micrfrx_wait_ready ( micrfrx_t *ctx );

• micrfrx_read_packet This function reads data packet and stores it in a packet_buf only if the MICRFRX_PREAMBLE bytes are received successfully.

static uint8_t micrfrx_read_packet ( micrfrx_t *ctx );

Application Init

Initializes the driver and enables the device and squelch mode.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    micrfrx_cfg_t micrfrx_cfg;  /**< Click config object. */

    /** 
     * 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.
    micrfrx_cfg_setup( &micrfrx_cfg );
    MICRFRX_MAP_MIKROBUS( micrfrx_cfg, MIKROBUS_1 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == micrfrx_init( &micrfrx, &micrfrx_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    micrfrx_enable_squelch ( &micrfrx );
    micrfrx_enable_device ( &micrfrx );

    log_info( &logger, " Application Task " );
}

Application Task

Waits for a data ready indication, then reads all packet data, verifies the CRC bytes in a packet, and displays its data as well as the RSSI value on the USB UART.

void application_task ( void )
{
    static float rssi_v = 0;
    static uint8_t packet_len = 0;
    static uint8_t msg_cnt = 0;
    static uint16_t crc = 0;

    log_printf( &logger, "\r\n Waiting for data ready...\r\n" );
    micrfrx_wait_ready ( &micrfrx );
    packet_len = micrfrx_read_packet ( &micrfrx );
    if ( packet_len )
    {
        micrfrx_read_rssi_voltage ( &micrfrx, &rssi_v );
        crc = ( ( uint16_t ) packet_buf[ packet_len - 2 ] << 8 ) | packet_buf[ packet_len - 1 ];
        if ( crc == micrftx2_calculate_crc16 ( packet_buf, packet_len - 2 ) )
        {
            log_printf( &logger, " Received message: " );
            for ( msg_cnt = 0; msg_cnt < packet_buf[ 2 ]; msg_cnt++ )
            {
                log_printf( &logger, "%c", ( uint16_t ) packet_buf[ msg_cnt + 3 ] );
            }
            log_printf( &logger, "\r\n RSSI: %.1f dBm\r\n", MICRFRX_RSSI_V_TO_DBM ( rssi_v ) );
        }
    }
    Delay_ms ( 100 );
}

Note

The MICRF TX Click board is a compatible transmitter for the MICRF RX Click. Here are a few steps for troubleshooting if you are experiencing issues running this example:

• Make sure the MICRF TX Click is set to ASK mode with on-board jumpers.
• Check the MCU clock configuration, use an external oscillator instead of the MCU's internal one for better accuracy on manchester data rate delay.
• Measure the actual data rate on the data line and adjust the MICRFRX_MAN_BIT_LEN_US value accordingly.

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.

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