pwm  2.0.0.0
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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


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 );

  • Click Default Configuration function.

    void pwm_default_cfg ( pwm_t *ctx );

Example key functions :

  • Channel state function.

    void pwm_channel_state ( 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.
log_cfg.level = LOG_LEVEL_DEBUG;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_printf( &logger, "---- Application Init ----\r\n" );
// Click initialization.
pwm_cfg_setup( &cfg );
PWM_MAP_MIKROBUS( cfg, MIKROBUS_1 );
pwm_init( &pwm, &cfg );
Delay_ms( 100 );
pwm_dev_config( &pwm, &config );
pwm_set_pre_scale( &pwm, 0x04 );
pwm_dev_config( &pwm, &config );
pwm_output_config( &pwm, &config1 );
Delay_ms( 100 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " PWM Click \r\n" );
log_printf( &logger, "--------------------------\r\n" );
}

Application Task

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

void application_task ( void )
{
uint16_t raw_dc;
uint8_t chann_id;
uint8_t duty_cycle;
chann_id = 0;
log_printf( &logger, "Channel 0 false state \r\n " );
pwm_channel_state( &pwm, chann_id, 0 );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 2000 );
log_printf( &logger, "Channel 0 set raw \r\n" );
for ( raw_dc = 0; raw_dc < PWM_MAX_RESOLUTION; raw_dc += 256 )
{
pwm_set_channel_raw( &pwm, chann_id, 0, raw_dc );
log_printf( &logger, " >\r\n" );
Delay_ms( 500 );
}
log_printf( &logger, "\r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 1000 );
log_printf( &logger, "Channel 0 set \r\n" );
for ( duty_cycle = 0; duty_cycle < 100; duty_cycle += 10 )
{
pwm_set_channel_raw( &pwm, chann_id, 0, duty_cycle );
log_printf( &logger, " > \r\n" );
Delay_ms( 500 );
}
log_printf( &logger, "\r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 1000 );
log_printf( &logger, "All Channels raw set \r\n" );
for ( raw_dc = 0; raw_dc < PWM_MAX_RESOLUTION; raw_dc += 256 )
{
pwm_set_all_raw( &pwm, raw_dc );
log_printf( &logger, " >\r\n" );
Delay_ms( 500 );
}
log_printf( &logger, "\r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 1000 );
log_printf( &logger, "All Channels set \r\n" );
for ( duty_cycle = 0; duty_cycle < 100; duty_cycle += 10 )
{
pwm_set_all( &pwm, duty_cycle );
log_printf( &logger, " >\r\n" );
Delay_ms( 500 );
}
log_printf( &logger, "\r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 1000 );
log_printf( &logger, "All Channels false state \r\n " );
pwm_all_chann_state( &pwm, 0 );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 2000 );
}

Note

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.


PWM_MAX_RESOLUTION
#define PWM_MAX_RESOLUTION
Definition: pwm.h:61
pwm_set_all_raw
void pwm_set_all_raw(pwm_t *ctx, uint16_t raw_dc)
Set all channels raw function.
pwm_cfg_setup
void pwm_cfg_setup(pwm_cfg_t *cfg)
Config Object Initialization function.
pwm_set_channel_raw
void pwm_set_channel_raw(pwm_t *ctx, uint8_t chann_id, uint16_t raw_off_set, uint16_t raw_dc)
Set channel raw function.
pwm_cfg_t
Click configuration structure definition.
Definition: pwm.h:348
pwm_set_pre_scale
void pwm_set_pre_scale(pwm_t *ctx, uint8_t pre_scale)
Set pre scale function.
application_task
void application_task(void)
Definition: main.c:67
pwm_init
PWM_RETVAL pwm_init(pwm_t *ctx, pwm_cfg_t *cfg)
Initialization function.
PWM_DISABLE
#define PWM_DISABLE
Definition: pwm.h:85
pwm_set_all
void pwm_set_all(pwm_t *ctx, uint8_t duty_cyc)
Set all channels function.
pwm_channel_state
void pwm_channel_state(pwm_t *ctx, uint8_t chann_id, uint8_t state)
Channel state function.
pwm_dev_config
void pwm_dev_config(pwm_t *ctx, uint8_t *config)
Device configuration function.
pwm_all_chann_state
void pwm_all_chann_state(pwm_t *ctx, uint8_t state)
All channels state function.
PWM_MAP_MIKROBUS
#define PWM_MAP_MIKROBUS(cfg, mikrobus)
Definition: pwm.h:51
application_init
void application_init(void)
Definition: main.c:35
pwm_output_config
void pwm_output_config(pwm_t *ctx, uint8_t *config1)
Output configuration function.
pwm_set_output
void pwm_set_output(pwm_t *ctx, uint8_t en_ou)
Output state set function.