Library Description

The library covers all the necessary functions to control the PWM driver Click board. PWM driver Click communicates with the target board via the PWM module. This library contains drivers for PWM function: initialization, for sets duty ratio, starts and stops PWM module.

Key functions:

• void pwmdriver_gpioDriverInit( (T_PWMDRIVER_P)&_MIKROBUS1_GPIO ) - Function initializes GPIO driver for the desired MIKROBUS1.

Examples description

The application is composed of three sections:

• System Initialization - Initializes GPIO and LOG structures, sets AN and INT pins as input and sets RST and PWM pins as output.
• Application Initialization -  Initialization driver enables - GPIO, PWM initialization set PWM duty cycle and PWM frequency, start PWM, enable the engine, and start to write log.
• Application Task - (code snippet) This is an example which demonstrates the use of PWM driver Click board. PWM driver Click communicates with register via PWM interface. This example shows the automatic control halogen bulb light intensity, the first intensity of light is rising and then the intensity of light is falling. Results are being sent to the Usart Terminal where you can track their changes.

void applicationTask() 
{
    mikrobus_logWrite( " Light Intensity Rising  ", _LOG_LINE );
    Delay_1sec();
 
    for ( dutyCycle = 5; dutyCycle < 255; dutyCycle += 25 )
    {
        pwmdriver_pwmSetDuty( dutyCycle );
        mikrobus_logWrite( " >", _LOG_TEXT );
        Delay_1sec();
    }
 
    mikrobus_logWrite( "", _LOG_LINE );
    mikrobus_logWrite( "-------------------------", _LOG_LINE );
    mikrobus_logWrite( " Light Intensity Falling ", _LOG_LINE );
    Delay_1sec();
 
    for ( dutyCycle = 255; dutyCycle > 5; dutyCycle -= 25 )
    {
        pwmdriver_pwmSetDuty( dutyCycle );
        mikrobus_logWrite( " <", _LOG_TEXT );
        Delay_1sec();
    }
  
    mikrobus_logWrite( "", _LOG_LINE );
    mikrobus_logWrite( "-------------------------", _LOG_LINE );
    Delay_1sec();
}  

Additional Functions :

• uint32_t pwmdriver_pwmInit( uint16_t freq ) - Initializes the Timer module in PWM mode.
• void pwmdriver_pwmSetDuty( uint16_t duty ) - The function changes PWM duty ratio.
• void pwmdriver_pwmStart() - Starts appropriate PWM module.
• void pwmdriver_pwmStop() - Stops appropriate PWM module.

Other mikroE Libraries used in the example:

• PWM
• UART

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