nfcextend  2.0.0.0
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NFC Extend Click

NFC Extend Click is NFC tag interface device with possibility of using any shape and size external antenna, offering 16 Kbit of electrically erasable programmable memory (EEPROM). This Click Boardâ„¢ offer two communication interfaces.>

Click Product page


Click library

  • Author : MikroE Team
  • Date : Feb 2020.
  • Type : I2C type

Software Support

We provide a library for the NfcExtend 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for NfcExtend Click driver.

Standard key functions :

  • Config Object Initialization function.

    void nfcextend_cfg_setup ( nfcextend_cfg_t *cfg );

  • Initialization function.

    NFCEXTEND_RETVAL nfcextend_init ( nfcextend_t *ctx, nfcextend_cfg_t *cfg );

  • Click Default Configuration function.

    void nfcextend_default_cfg ( nfcextend_t *ctx );

Example key functions :

  • This function writes data to the chip.

    uint8_t nfcextend_i2c_set ( nfcextend_t *ctx, nfcextend_block_t *block );

  • This function reads data from the chip.

    uint8_t nfcextend_i2c_get ( nfcextend_t *ctx, nfcextend_block_t *block );

  • This function reads the digital signal from the INT pin.

    uint8_t nfcextend_digital_read_int ( nfcextend_t *ctx );

Examples Description

This example showcases how to configure and use the NFC Extend Click. The Click is an NFC tag

interface which uses the I2C serial interface and an RF link interface in order to communicate. The example requires the ST25 NFC Tap application which can be downloaded to your phone.

The demo application is composed of two sections :

Application Init

This function initializes and configures the logger and Click modules.

{
log_cfg_t log_cfg;
uint8_t init_status_flag;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
NFCEXTEND_MAP_MIKROBUS( cfg, MIKROBUS_1 );
nfcextend_init( &nfcextend, &cfg );
Delay_ms ( 100 );
init_status_flag = nfcextend_default_cfg( &nfcextend );
Delay_ms ( 100 );
if ( 1 == init_status_flag )
{
log_printf( &logger, " * App init failed. *\r\n" );
}
else if ( 0 == init_status_flag )
{
log_printf( &logger, " * App init done. *\r\n" );
}
log_printf( &logger, "-----------------------\r\n" );
}

Application Task

This function waits for the interrupt signal, after which it expects data transfers. Once

some data has been detected it will open a communication channel with the device transmitting it and show the received data in the UART console.

{
uint8_t temp_buf[ 258 ];
uint16_t message_len;
uint16_t cnt;
block.data_buf = temp_buf;
block.len = 1;
nfcextend_i2c_get( &nfcextend, &block );
if ( ( temp_buf[ 0 ] & 0x04 ) == 0x04 )
{
block.data_buf = &temp_buf[ 0 ];
nfcextend_i2c_get( &nfcextend, &block );
message_len = temp_buf[ 0 ] + 1;
block.data_buf = &temp_buf[ 0 ];
block.len = message_len;
nfcextend_i2c_get( &nfcextend, &block );
log_printf( &logger, " ** Message length: %u Bytes**\r\n", message_len);
log_printf( &logger, " ------------------------------\r\n" );
log_printf( &logger, " ** Message START **\r\n" );
for ( cnt = 0; cnt < message_len; cnt++ )
{
log_printf( &logger, " %u : 0x%x\r\n", cnt, ( uint16_t ) temp_buf[ cnt ] );
}
log_printf( &logger, " ** Message END **\r\n" );
log_printf( &logger, " ------------------------------\r\n" );
}
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.NfcExtend

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.


application_init
void application_init()
Definition: main.c:68
nfcextend_default_cfg
uint8_t nfcextend_default_cfg(nfcextend_t *ctx)
Click Default Configuration function.
nfcextend_cfg_setup
void nfcextend_cfg_setup(nfcextend_cfg_t *cfg)
Config Object Initialization function.
nfcextend_i2c_get
uint8_t nfcextend_i2c_get(nfcextend_t *ctx, nfcextend_block_t *block)
I2C get function.
default_password
uint8_t default_password[NFCEXTEND_PASSWORD_LEN]
Definition: main.c:34
nfcextend_block_t::memory_area
uint8_t memory_area
Definition: nfcextend.h:187
NFCEXTEND_MAILBOX_REG_BYTE_0
#define NFCEXTEND_MAILBOX_REG_BYTE_0
Definition: nfcextend.h:160
nfcextend_init
NFCEXTEND_RETVAL nfcextend_init(nfcextend_t *ctx, nfcextend_cfg_t *cfg)
Initialization function.
nfcextend_password_present
uint8_t nfcextend_password_present(nfcextend_t *ctx, uint8_t *pass_buf)
Password present function.
nfcextend_cfg_t
Click configuration structure definition.
Definition: nfcextend.h:217
nfcextend_block_t::reg_addr
uint16_t reg_addr
Definition: nfcextend.h:188
nfcextend_block_t::data_buf
uint8_t * data_buf
Definition: nfcextend.h:189
NFCEXTEND_MEMORY_DYNAMIC
#define NFCEXTEND_MEMORY_DYNAMIC
Definition: nfcextend.h:94
NFCEXTEND_MEMORY_MAILBOX
#define NFCEXTEND_MEMORY_MAILBOX
Definition: nfcextend.h:95
nfcextend_block_t::len
uint16_t len
Definition: nfcextend.h:190
NFCEXTEND_DYNAMIC_REG_MB_CTRL
#define NFCEXTEND_DYNAMIC_REG_MB_CTRL
Definition: nfcextend.h:151
NFCEXTEND_MAP_MIKROBUS
#define NFCEXTEND_MAP_MIKROBUS(cfg, mikrobus)
Definition: nfcextend.h:65
application_task
void application_task()
Definition: main.c:111
NFCEXTEND_DYNAMIC_REG_MB_LEN
#define NFCEXTEND_DYNAMIC_REG_MB_LEN
Definition: nfcextend.h:152
wait_for_interrupt
void wait_for_interrupt()
Definition: main.c:38
nfcextend_block_t
I2C communication block object definition.
Definition: nfcextend.h:186