RFID click

RFid click features CR95HF 13.56 MHz contactless transceiver as well as trace antenna.

click Product page

Click library

• Author : Stefan Filipovic
• Date : Apr 2021.
• Type : SPI type

Software Support

We provide a library for the RFID 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 RFID Click driver.

Standard key functions :

• rfid_cfg_setup Config Object Initialization function.

  void rfid_cfg_setup ( rfid_cfg_t *cfg );

• rfid_init Initialization function.

  RFID_RETVAL rfid_init ( rfid_t *ctx, rfid_cfg_t *cfg );

• rfid_default_cfg Click Default Configuration function.

  void rfid_default_cfg ( rfid_t *ctx );

Example key functions :

• rfid_select_communication_interface Select communication interface.

  err_t rfid_select_communication_interface ( rfid_t* ctx, uint8_t com_interface );

• rfid_get_tag_uid Get RFID tag uid function.

  err_t rfid_get_tag_uid ( rfid_t *ctx, uint8_t rfid_protocol, uint8_t *tag_uid );

• rfid_get_device_id RFID get device id function.

  err_t rfid_get_device_id ( rfid_t *ctx, uint8_t *device_id );

Example Description

This example demonstrates the use of RFID Click board by reading MIFARE ISO/IEC 14443 type A tag UID.

The demo application is composed of two sections :

Application Init

Initializes the driver, selects the communication interface and performs the click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    rfid_cfg_t rfid_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 " );
    Delay_ms ( 100 );

    // Click initialization.

    rfid_cfg_setup( &rfid_cfg );
    RFID_MAP_MIKROBUS( rfid_cfg, MIKROBUS_1 );
    err_t error_flag = rfid_init( &rfid, &rfid_cfg );
    if ( error_flag != RFID_OK ) 
    {
        log_error( &logger, " Please, run program again... " );
        for ( ; ; );
    }

    log_printf( &logger, " Selecting communication interface... \r\n" );
    error_flag = rfid_select_communication_interface ( &rfid, RFID_SPI );
    if ( error_flag != RFID_OK ) 
    {
        log_error( &logger, " Please, run program again... " );
        for ( ; ; );
    }

    log_printf( &logger, " Configuring the device... \r\n" );
    error_flag = rfid_default_cfg ( &rfid );
    if ( error_flag != RFID_OK ) 
    {
        log_error( &logger, " Please, run program again... " );
        for ( ; ; );
    }

    log_printf( &logger, " The device has been configured! \r\n" );
}

Application Task

If there's a tag detected, it reads its UID and displays it on USB UART.

void application_task ( void )
{
    uint8_t tag_uid[ 20 ] = { 0 };
    uint8_t tag_len = rfid_get_tag_uid( &rfid, RFID_ISO_14443A, tag_uid );
    if ( tag_len > 0 )
    {
        log_printf( &logger, " TAG UID: " );
        for ( uint8_t cnt = 0; cnt < tag_len; cnt++ )
        {
            log_printf( &logger, "0x%.2X ", ( uint16_t ) tag_uid[ cnt ] );
        }
        log_printf( &logger, "\r\n----------------------------------\r\n" );
        Delay_ms ( 1000 );
    }
}

Note

It is recommended to tie SSI_0, SSI_1 to VCC/GND at power-up, depending on the communication interface selection by A and B on-board jumpers. SSI_0 - UART: 0 SPI: 1 SSI_1 - UART: 0 SPI: 0

Only tags with 4-byte or 7-byte UIDs are compatible with this example. We recommend MIKROE-1475 - an RFiD tag 13.56MHz compliant with ISO14443-A standard.

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.RFID

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.