UART I2C/SPI Click

UART I2C/SPI Click is an all-in-one solution which allows ESD-protected RS-232 connectivity to any embedded application while bridging the UART and I2C/SPI interfaces at the same time. It is equipped with the DE-9 connector, so it can be easily connected.

Click Product page

Click library

• Author : MikroE Team
• Date : Jun 2020.
• Type : I2C/SPI type

Software Support

We provide a library for the UARTI2CSPI 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 UARTI2CSPI Click driver.

Standard key functions :

• Config Object Initialization function.

  void uarti2cspi_cfg_setup ( uarti2cspi_cfg_t *cfg );

• Initialization function.

  UARTI2CSPI_RETVAL uarti2cspi_init ( uarti2cspi_t ctx, uarti2cspi_cfg_t cfg );

• Set RST pin state function.

  void uarti2cspi_set_reset ( uarti2cspi_t *ctx, uint8_t state );

Example key functions :

• Advanced initialization function.

  void uarti2cspi_advanced_init ( uarti2cspi_t *ctx, uint32_t baud_rate, uint8_t data_bits, uint8_t parity_mode, uint8_t stop_bits );

• Uart write text function.

  void uarti2cspi_uart_write_text ( uarti2cspi_t ctx, uint8_t w_text );

• This function reads one byte from the Click module.

  uint8_t uarti2cspi_uart_read ( uarti2cspi_t *ctx );

Examples Description

This example showcases how to initialize, configure and use the UART I2C/SPI Click module. The Click is a I2C/SPI to UART bridge interface. It requires a RS232/485 cable in order to be connected to other Click module or an adapter.

The demo application is composed of two sections :

Application Init

Initializes the driver, configures UART, and enables UART interrupts.

void application_init ( void )
{
    log_cfg_t log_cfg;
    uarti2cspi_cfg_t cfg;

    /** 
     * 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.

    uarti2cspi_cfg_setup( &cfg );
    UARTI2CSPI_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    uarti2cspi_init( &uarti2cspi, &cfg );
    Delay_ms ( 1000 );

    uarti2cspi_advanced_init( &uarti2cspi, 115200, UARTI2CSPI_UART_8_BIT_DATA, 
                                                   UARTI2CSPI_UART_NOPARITY,
                                                   UARTI2CSPI_UART_ONE_STOPBIT );
    Delay_ms ( 100 );
    uarti2cspi_interrupt_enable( &uarti2cspi, UARTI2CSPI_RXD_INT_EN | UARTI2CSPI_THR_EMPTY_INT_EN );

    Delay_ms ( 100 );

#ifdef DEMO_APP_TRANSMITTER
    log_info( &logger, "---- TRANSMITTER MODE ----" );
#endif
#ifdef DEMO_APP_RECEIVER
    log_info( &logger, "---- RECEIVER MODE ----" );
#endif
    Delay_ms ( 1000 );
}

Application Task

Depending on the selected mode, it reads all the received data or sends the desired message every 2 seconds.

void application_task ( void )
{
#ifdef DEMO_APP_TRANSMITTER
    uarti2cspi_uart_write_text( &uarti2cspi, TEXT_TO_SEND );
    log_info( &logger, "---- The message has been sent ----" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
#endif
#ifdef DEMO_APP_RECEIVER
    if ( uarti2cspi_uart_data_ready( &uarti2cspi ) )
    {
        uint8_t rx_data = uarti2cspi_uart_read( &uarti2cspi );
        log_printf( &logger, "%c", rx_data );
    }
#endif
} 

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.UARTI2CSPI

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.