pwm

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PWM click

PWM click is a simple solution for controlling 16 PWM outputs through a single I2C interface. You can use it to control anything from a simple LED strip to a complex robot with a multitude of moving parts.

click Product page

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Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : I2C type

Software Support

We provide a library for the Pwm 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Pwm Click driver.

Standard key functions :

• Config Object Initialization function.

void pwm_cfg_setup ( pwm_cfg_t *cfg );

• Initialization function.

PWM_RETVAL pwm_init ( pwm_t *ctx, pwm_cfg_t *cfg );

Example key functions :

• Device configuration function.

void pwm_dev_config ( pwm_t *ctx, uint8_t chann_id, uint8_t state );

• Set channel raw function.

void pwm_set_channel_raw ( pwm_t *ctx, uint8_t chann_id, uint16_t raw_off_set, uint16_t raw_dc );

• Set all channels raw function.

void pwm_set_all_raw ( pwm_t *ctx, uint16_t raw_dc );

Examples Description

This is an example that shows some of the functions that PWM click has.

The demo application is composed of two sections :

Application Init

Initalizes I2C driver, enables output, configures device, sets prescaling, configures output and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;
    pwm_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.

    pwm_cfg_setup( &cfg );
    PWM_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    pwm_init( &pwm, &cfg );
    Delay_ms ( 100 );
    
    pwm_set_output( &pwm, PWM_ENABLE );
    pwm_dev_config( &pwm, &config0 );
    pwm_set_pre_scale( &pwm, 0x04 );
    pwm_dev_config( &pwm, &config1 );
    pwm_output_config( &pwm,  &config2 );
    Delay_ms ( 100 );
    
    log_printf( &logger, "--------------------------\r\n" );
    log_printf( &logger, " PWM  Click \r\n" );
    log_printf( &logger, "--------------------------\r\n" );
}
  

Application Task

Changes the duty cycle of all channels every 10 seconds. All data are being logged on USB UART where you can track their changes.

void application_task ( void )
{
    uint8_t chann_id;
    
    pwm_set_all_raw( &pwm, PWM_MAX_RESOLUTION / 2 );
    log_printf( &logger, "All Channels set to 50%% duty cycle \r\n" );
    log_printf( &logger, "--------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    for ( chann_id = 0; chann_id < 8; chann_id++ )
    {
        pwm_set_channel_raw( &pwm, chann_id, 0, PWM_MAX_RESOLUTION / 4 );
    }
    log_printf( &logger, "Channels 0-7 set to 25%% duty cycle \r\n" );
    log_printf( &logger, "--------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    for ( chann_id = 0; chann_id < 8; chann_id++ )
    {
        pwm_set_channel_raw( &pwm, chann_id, 0, ( PWM_MAX_RESOLUTION / 4 ) * 3 );
    }
    log_printf( &logger, "Channels 0-7 set to 75%% duty cycle \r\n" );
    log_printf( &logger, "--------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    pwm_all_chann_state( &pwm, 0 );
    log_printf( &logger, "All Channels disabled \r\n " );
    log_printf( &logger, "--------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
} 

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Pwm

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.

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