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mikroSDK Library

Analog To PWM click

Rating:

5

Author: MIKROE

Last Updated: 2020-04-06

Package Version: 1.0.0.0

mikroSDK Library: 1.0.0.0

Category: Measurements

Downloaded: 3595 times

Not followed.

License: MIT license  

AN to PWM Click is a device that converts the value of the input analog signal with virtually any wave shape to a fixed frequency PWM voltage output, with a duty cycle proportional to the input voltage

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mikroSDK Library Blog

AN to PWM Click

AN to PWM Click

Native view of the AN to PWM Click board.

View full image
AN to PWM Click

AN to PWM Click

Front and back view of the AN to PWM Click board.

View full image

Library Description

The library contains a interrupt pin state function.

Key functions:

  • uint8_t antopwm_get_int_state( ) - Gets interrupt pin state

Examples description

The application is composed of three sections :

  • System Initialization - Initializes the INT pin required to measure.
  • Application Initialization - Initializes the driver and timer on 1us
  • Application Task - Waits for the + command entered. When a command is entered, it calculates the PWM signal and the voltage on the INT pin.
void application_task ( )
{
    uint8_t drdy;
    char rsp_data;

    drdy = UART_Rdy_Ptr( );

    if ( drdy != 0 )
    {
        rsp_data = UART_Rd_Ptr( );

        switch ( rsp_data )
        {
            case '+' :
            {
                // Reset flags
                period_flag = 0;
                idle_high_cnt = 0;
                idle_low_cnt = 0;
                period_cnt = 0;
                    
                while ( period_flag != 1 );
                
                idle_high_cnt /= 10;
                idle_low_cnt /= 10;

                if ( ( idle_high_cnt != 0 ) && ( idle_high_cnt != 0 ) )
                {
                    tmp_value = calc_percentage( idle_high_cnt );
                    FloatToStr( tmp_value, demo_text );
                    mikrobus_logWrite( "> Idle [HIGH]: ~ ", _LOG_TEXT );
                    mikrobus_logWrite( demo_text, _LOG_TEXT );
                    mikrobus_logWrite( " %", _LOG_LINE );

                    tmp_value = calc_percentage( idle_low_cnt );
                    FloatToStr( tmp_value, demo_text );
                    mikrobus_logWrite( "> Idle [LOW]: ~ ", _LOG_TEXT );
                    mikrobus_logWrite( demo_text, _LOG_TEXT );
                    mikrobus_logWrite( " %", _LOG_LINE );

                    tmp_value = calc_voltage( idle_high_cnt );
                    FloatToStr( tmp_value , demo_text );
                    mikrobus_logWrite( "> Voltage: ~ ", _LOG_TEXT );
                    mikrobus_logWrite( demo_text, _LOG_TEXT );
                    mikrobus_logWrite( " mV", _LOG_LINE );

                    mikrobus_logWrite( "--------------------------------", _LOG_LINE );
                }
                mikrobus_logWrite( "--- Please, enter the command [ + ].", _LOG_LINE );
                break;
            }
        }
    }
}


Additional Functions :

  • calc_percentage( ) - Represented data as a percentage
  • calc_voltage( ) - Voltage calculation
  • timer_init_1us( ) - Sets timer on 1us

Other mikroE Libraries used in the example:

  • Conversions
  • UART library

Additional notes and informations

Depending on the development board you are using, you may need USB UART clickUSB 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.

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