uarti2cspi2

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UART I2C SPI 2 Click

UART I2C SPI 2 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 : Sep 2025.
• Type : I2C/SPI type

Software Support

Example Description

This example demonstrates the use of the UART I2C SPI 2 Click board. It sends a predefined demo message to both UART0 and UART1 interfaces, then reads back any received data and logs the results on the USB UART.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.UARTI2CSPI2

Example Key Functions

• uarti2cspi2_cfg_setup This function initializes Click configuration structure to initial values.

  void uarti2cspi2_cfg_setup ( uarti2cspi2_cfg_t *cfg );

• uarti2cspi2_init This function initializes all necessary pins and peripherals used for this Click board.

  err_t uarti2cspi2_init ( uarti2cspi2_t *ctx, uarti2cspi2_cfg_t *cfg );

• uarti2cspi2_default_cfg This function executes a default configuration of UART I2C SPI 2 Click board.

  err_t uarti2cspi2_default_cfg ( uarti2cspi2_t *ctx );

• uarti2cspi2_read_reg This function reads a single byte of data from the selected register address.

  err_t uarti2cspi2_read_reg ( uarti2cspi2_t *ctx, uint8_t reg, uint8_t *data_out );

• uarti2cspi2_read_data This function reads a block of data from the receive buffer.

  err_t uarti2cspi2_read_data ( uarti2cspi2_t *ctx, uint8_t *data_out, uint8_t len );

• uarti2cspi2_write_data This function writes a block of data to the transmit buffer.

  err_t uarti2cspi2_write_data ( uarti2cspi2_t *ctx, uint8_t *data_in, uint8_t len );

Application Init

Initializes the logger and UART I2C SPI 2 Click, and applies the default configuration which sets the UART0 to 115200-8N1 and UART1 to 9600-8N1.

void application_init ( void )
{
    log_cfg_t log_cfg;  
    uarti2cspi2_cfg_t uarti2cspi2_cfg;  

    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
 
    // Click initialization.
    uarti2cspi2_cfg_setup( &uarti2cspi2_cfg );
    UARTI2CSPI2_MAP_MIKROBUS( uarti2cspi2_cfg, MIKROBUS_1 );
    err_t init_flag = uarti2cspi2_init( &uarti2cspi2, &uarti2cspi2_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( UARTI2CSPI2_ERROR == uarti2cspi2_default_cfg ( &uarti2cspi2 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Alternately selects UART0 and UART1, sends the demo message, reads back data from the RX FIFO, and logs the transmitted and received strings every second.

void application_task ( void )
{
    uint8_t fifo_data[ UARTI2CSPI2_FIFO_LEN ] = { 0 };
    uint8_t fifo_lvl = 0;
    uarti2cspi2_select_uart_0 ( &uarti2cspi2 );
    if ( UARTI2CSPI2_OK == uarti2cspi2_write_data ( &uarti2cspi2, "U0: ", 4 ) )
    {
        if ( UARTI2CSPI2_OK == uarti2cspi2_write_data ( &uarti2cspi2, DEMO_MESSAGE, strlen ( DEMO_MESSAGE ) ) )
        {
            log_printf ( &logger, "\r\nSend to U0: %s", DEMO_MESSAGE );
        }
    }
    if ( UARTI2CSPI2_OK == uarti2cspi2_read_reg ( &uarti2cspi2, UARTI2CSPI2_REG_RXFIFOLVL, &fifo_lvl ) )
    {
        if ( UARTI2CSPI2_OK == uarti2cspi2_read_data ( &uarti2cspi2, fifo_data, fifo_lvl ) )
        {
            log_printf ( &logger, "Read from U0: %s\r\n", fifo_data );
        }
    }
    uarti2cspi2_select_uart_1 ( &uarti2cspi2 );
    if ( UARTI2CSPI2_OK == uarti2cspi2_write_data ( &uarti2cspi2, "U1: ", 4 ) )
    {
        if ( UARTI2CSPI2_OK == uarti2cspi2_write_data ( &uarti2cspi2, DEMO_MESSAGE, strlen ( DEMO_MESSAGE ) ) )
        {
            log_printf ( &logger, "Send to U1: %s", DEMO_MESSAGE );
        }
    }
    if ( UARTI2CSPI2_OK == uarti2cspi2_read_reg ( &uarti2cspi2, UARTI2CSPI2_REG_RXFIFOLVL, &fifo_lvl ) )
    {
        if ( UARTI2CSPI2_OK == uarti2cspi2_read_data ( &uarti2cspi2, fifo_data, fifo_lvl ) )
        {
            log_printf ( &logger, "Read from U1: %s\r\n", fifo_data );
        }
    }
    Delay_ms ( 1000 );
}

Note

Ensure that the connected devices on UART0 and UART1 are properly configured to communicate at the same baud rate and parameters.

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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