Stepper 18 Click

Stepper 18 Click is a compact add-on board that contains a microstepping stepper motor driver. This board features the DRV8426, a stepper motor driver for industrial and consumer applications from Texas Instruments.

Click Product page

Click library

• Author : Luka Filipovic
• Date : May 2021.
• Type : I2C type

Software Support

We provide a library for the Stepper18 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 Stepper18 Click driver.

Standard key functions :

• stepper18_cfg_setup Config Object Initialization function.

  void stepper18_cfg_setup ( stepper18_cfg_t *cfg );

• stepper18_init Initialization function.

  STEPPER18_RETVAL stepper18_init ( stepper18_t *ctx, stepper18_cfg_t *cfg );

• stepper18_default_cfg Click Default Configuration function.

  void stepper18_default_cfg ( stepper18_t *ctx );

Example key functions :

• stepper18_set_out_voltage Set voltage reference.

  err_t stepper18_set_out_voltage ( stepper18_t *ctx, uint16_t voltage );

• stepper18_set_dir Set direction.

  void stepper18_set_dir ( stepper18_t *ctx, uint8_t value );

• stepper18_move_motor_angle Move motor in angle value.

  void stepper18_move_motor_angle ( stepper18_t *ctx, float degree, uint8_t step_res, uint8_t speed );

Example Description

This example showcases the device's ability to control the motor. It initializes the device for control and moves the motor in two directions in a variety of speeds for 360 degrees.

The demo application is composed of two sections :

Application Init

Initializes UART and I2C communication modules, and additional
pins for motor control, and set's default configuration

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    stepper18_cfg_t stepper18_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 " );

    // Click initialization.
    stepper18_cfg_setup( &stepper18_cfg );
    STEPPER18_MAP_MIKROBUS( stepper18_cfg, MIKROBUS_1 );
    err_t init_flag = stepper18_init( &stepper18, &stepper18_cfg );
    if ( init_flag == I2C_MASTER_ERROR ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );
        for ( ; ; );
    }

    stepper18_default_cfg ( &stepper18 );
    log_info( &logger, " Application Task " );
    stepper18_set_dir( &stepper18, 0 );
}

Application Task

First it move motor clockwise for 360 degrees in medium speed. Then changes direction and moves motor for 180 degrees in slow speed, and additional 180 degrees in fast speed.

void application_task ( void ) 
{
    static uint8_t direction = 0;
    log_printf( &logger, "> Move 360deg in CW direction.\r\n" );
    stepper18_move_motor_angle( &stepper18, 360, STEPPER18_STEP_RES_FULL, STEPPER18_SPEED_MEDIUM );
    direction = !direction;
    stepper18_set_dir( &stepper18, direction );
    Delay_ms ( 500 );
    log_printf( &logger, "> Move 180deg in CCW direction.\r\n" );
    stepper18_move_motor_angle( &stepper18, 180, STEPPER18_STEP_RES_FULL, STEPPER18_SPEED_SLOW );
    Delay_ms ( 1000 );
    log_printf( &logger, "> Move 180deg in CCW direcion.\r\n" );
    stepper18_move_motor_angle( &stepper18, 180, STEPPER18_STEP_RES_FULL, STEPPER18_SPEED_FAST );
    direction = !direction;
    stepper18_set_dir( &stepper18, direction );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

Note

Step resolution is changed by the switches[ M0, M1 ] on device. Full step : M0=>0 , M1=>0; Half step : M0=>1 , M1=>0; Quarter step : M0=>0 , M1=>1; 1/8 step : M0=>1 , M1=>1; 1/16 step : M0=>Hi-Z , M1=>1; 1/32 step : M0=>0 , M1=>Hi-Z; 1/64 step : M0=>Hi-Z , M1=>0; 1/128 step : M0=>Hi-Z , M1=>Hi-Z; 1/256 step : M0=>1 , M1=>0;

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.Stepper18

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. UART terminal is available in all MikroElektronika compilers.