Library Description

Library carries everything needed for stepper motor control including speed and acceleration setup. Library is also adjustable to working on different amount of ticks per second, also speed and acceleration can be provided in float format. Buffer used for movement calculation is defined by user so this library can be adjusted for MCUs with very limited RAM resources. Check documentation for more details how to use it.

Key functions:

• uint8_t silentstep3_setSpeed( float minSpeed, float maxSpeed, float accelRatio, T_SILENTSTEP3_OBJ obj ) - Setup motor speed.
• uint8_t silentstep3_setRoute( const uint8_t _direction, uint32_t steps, T_SILENTSTEP3_OBJ obj ) - Setup new route.
• void silentstep3_start( T_SILENTSTEP3_OBJ obj ) - Start motor movement.

Examples description

The application is composed of three sections :

• System Initialization - Initializes all GPIO pins found on Silent Step 3 click, SPI serial interface and timer to 1ms interrupt.
• Application Initialization - First segment initializes driver and stepper control. Second segment setup movement limits, maximum and minimum speed, and acceleration ratio. Third segment enables motor and setup new route which will be called from application task. Fourth segment executes device control and configuration by using SPI serial interface.
• Application Task - (code snippet) - Demonstrates the full stepper motor control, such as stepper motor speed, acceleration, direction, microstep resolution, steps number, and etc.

void applicationTask()
{
    running_cnt = 3;
    
    while (running_cnt > 0)
    {
        silentstep3_writeCmd( _SILENTSTEP3_HALFSTEP );
        silentstep3_setSpeed( 20.0, 1000.0, 0.1, (T_SILENTSTEP3_OBJ)&myStepper );
        silentstep3_setRoute( _SILENTSTEP3_DIR_CCW, 200, (T_SILENTSTEP3_OBJ)&myStepper );
        silentstep3_start( (T_SILENTSTEP3_OBJ)&myStepper );
        
        while (myStepper.status.running)
        {
            silentstep3_process( (T_SILENTSTEP3_OBJ)&myStepper );
        }
        
        silentstep3_writeCmd( _SILENTSTEP3_FULLSTEP );
        silentstep3_setSpeed( 1000.0, 1000.0, 0.1, (T_SILENTSTEP3_OBJ)&myStepper );
        silentstep3_setRoute( _SILENTSTEP3_DIR_CW, 200, (T_SILENTSTEP3_OBJ)&myStepper );
        silentstep3_start( (T_SILENTSTEP3_OBJ)&myStepper );
        
        while (myStepper.status.running)
        {
            silentstep3_process( (T_SILENTSTEP3_OBJ)&myStepper );
        }
        
        running_cnt--;
    }
    
    silentstep3_setSpeed( 10.0, 200.0, 0.1, (T_SILENTSTEP3_OBJ)&myStepper );
    silentstep3_setRoute( _SILENTSTEP3_DIR_CCW, 200, (T_SILENTSTEP3_OBJ)&myStepper );
    silentstep3_start( (T_SILENTSTEP3_OBJ)&myStepper );
    
    while (myStepper.status.running)
    {
        silentstep3_process( (T_SILENTSTEP3_OBJ)&myStepper );
    }

    silentstep3_setSpeed( 1000.0, 1000.0, 0.1, (T_SILENTSTEP3_OBJ)&myStepper );
    silentstep3_setRoute( _SILENTSTEP3_DIR_CW, 200, (T_SILENTSTEP3_OBJ)&myStepper );
    running_cnt = 6;

    while (running_cnt > 0)
    {
        silentstep3_start( (T_SILENTSTEP3_OBJ)&myStepper );
                
        while (myStepper.status.running)
        {
            silentstep3_process( (T_SILENTSTEP3_OBJ)&myStepper );
        }
                
        running_cnt--;
    }
    
    running_cnt = 12;
    
    while (running_cnt > 0)
    {
        silentstep3_writeCmd( _SILENTSTEP3_8_MICROSTEPS );
        silentstep3_setRoute( _SILENTSTEP3_DIR_CCW, 200, (T_SILENTSTEP3_OBJ)&myStepper );
        silentstep3_start( (T_SILENTSTEP3_OBJ)&myStepper );
        
        while (myStepper.status.running)
        {
            silentstep3_process( (T_SILENTSTEP3_OBJ)&myStepper );
        }
        
        silentstep3_writeCmd( _SILENTSTEP3_4_MICROSTEPS );
        silentstep3_setRoute( _SILENTSTEP3_DIR_CW, 200, (T_SILENTSTEP3_OBJ)&myStepper );
        silentstep3_start( (T_SILENTSTEP3_OBJ)&myStepper );
        
        while (myStepper.status.running)
        {
            silentstep3_process( (T_SILENTSTEP3_OBJ)&myStepper );
        }
        
        running_cnt--;
    }
    
    Delay_ms( 1000 );
}

In addition to library function calls example carries necessay Timer ISR and Timer initialization. Check Timer initialization setings and update it according to your MCU - Timer Calculator.

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.