micrftx

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MICRF TX click

MICRF TX Click is a compact add-on board designed as a powerful RF transmitter for data transmission over the 315MHz frequency band. This board features the MICRF112, a high-performance RF transmitter IC from Microchip, renowned for its efficiency in operation. This Click board™ stands out for its ease of use, requiring only a simple crystal oscillator to set the frequency, and supports both ASK and FSK modulation types with a Phase-Locked Loop (PLL) for stable frequency.

click Product page

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Click library

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

Software Support

We provide a library for the MICRF TX Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for MICRF TX Click driver.

Standard key functions :

• micrftx_cfg_setup Config Object Initialization function.

void micrftx_cfg_setup ( micrftx_cfg_t *cfg );

• micrftx_init Initialization function.

err_t micrftx_init ( micrftx_t *ctx, micrftx_cfg_t *cfg );

Example key functions :

• micrftx_send_data This function builds and sends a packet of data. The packet format is as follows (MSB first, manchester IEEE 802.3): MICRFTX_TRAINING_BYTES, PREABMLE, LEN, DATA_IN, CRC16 (calculated from whole packet excluding training bytes).

static void micrftx_send_data ( micrftx_t *ctx, uint16_t preamble, uint8_t *data_in, uint8_t len );

Example Description

This example demonstrates the use of MICRF TX click board by sending a predefined message to the receiver.

The demo application is composed of two sections :

Application Init

Initialized the driver and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;          /**< Logger config object. */
    micrftx_cfg_t micrftx_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.
    micrftx_cfg_setup( &micrftx_cfg );
    MICRFTX_MAP_MIKROBUS( micrftx_cfg, MIKROBUS_1 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == micrftx_init( &micrftx, &micrftx_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Sends a predefined message every 3 seconds and displays it on the USB UART.

void application_task ( void )
{
    log_printf ( &logger, " Sending data: %s\r\n\n", ( char * ) MICRFTX_MESSAGE );
    micrftx_send_data ( &micrftx, MICRFTX_PREAMBLE, MICRFTX_MESSAGE, strlen ( MICRFTX_MESSAGE ) );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

Note

The MICRF RX click board is a compatible receiver for the MICRF TX 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 MICRFTX_MAN_BIT_LEN_US value accordingly.

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.MICRFTX

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.

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