420mar

---

4-20 mA R Click

4-20 mA R 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.

---

Click Library

• Author : MikroE Team
• Date : Jan 2020.
• Type : SPI type

Software Support

Example Description

This example showcases how to initialize, configure and use the 4-20 mA R Click. It is a simple SPI communication module that acts as a receiver in a 4-20 current loop. The Click reads current data and converts the analog signal to a digital 12-bit format.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.420MaR

Example Key Functions

• c420mar_cfg_setup Config Object Initialization function.

void c420mar_cfg_setup ( c420mar_cfg_t *cfg );

• c420mar_init Initialization function.

err_t c420mar_init ( c420mar_t *ctx, c420mar_cfg_t *cfg );

• c420mar_default_cfg Click Default Configuration function.

void c420mar_default_cfg ( c420mar_t *ctx );

• c420mar_read_data This function reads the 16-bit current value from the SPI data register, and then normalizes and converts it to float.

float c420mar_read_data ( c420mar_t *ctx );

Application Init

This function initializes and configures the logger and Click modules.

void application_init ( )
{
    log_cfg_t log_cfg;
    c420mar_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.

    c420mar_cfg_setup( &cfg );
    c420MAR_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    c420mar_init( &c420mar, &cfg );
}

Application Task

This function reads and displays current data every half a second.

void application_task ( )
{
    float current;

    current = c420mar_read_data( &c420mar );

    log_printf( &logger, "-----------------------------\r\n" );
    log_printf( &logger, " * Current: %.3f mA * \r\n", current );

    Delay_ms ( 500 );
}

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.

---