Simple RGBW PWM LED Driver#

Simple RGBW PWM LED Driver provides functionality to control Red/Green/Blue/White LEDs that are driven by the PWM. Basic functionalities such as on, off, toggle, or retrieve state of RGBW LED can also be executed using this module.

Introduction#

The Simple RGBW PWM LED Driver is a module for the LED driver that provides functionality for controlling Red/Green/Blue/White LEDs that are driven by PWM.

RGBW PWM LED Configuration#

RGBW PWM LEDs use the sl_led_t struct, and their own structs sl_simple_rgbw_pwm_led_context_t and sl_led_rgbw_pwm_t. These are automatically generated into the following files, as well as instance specific headers with macro definitions in them. The samples below are for a single instance called "inst0".

// sl_simple_rgbw_pwm_led_instances.c

#include "em_gpio.h"
#include "sl_simple_rgbw_pwm_led.h"

#include "sl_simple_rgbw_pwm_led_inst0_config.h"



sl_led_pwm_t red_inst0 = {
  .port = SIMPLE_RGBW_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGBW_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGBW_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGBW_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGBW_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGBW_PWM_LED_INST0_LOC,
#endif
};

sl_led_pwm_t green_inst0 = {
  .port = SIMPLE_RGBW_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGBW_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGBW_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGBW_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGBW_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGBW_PWM_LED_INST0_LOC,
#endif
};

sl_led_pwm_t blue_inst0 = {
  .port = SIMPLE_RGBW_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGBW_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGBW_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGBW_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGBW_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGBW_PWM_LED_INST0_LOC,
#endif
};

sl_led_pwm_t white_inst0 = {
  .port = SIMPLE_RGBW_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGBW_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGBW_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGBW_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGBW_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGBW_PWM_LED_INST0_LOC,
#endif
};

sl_simple_rgbw_pwm_led_context_t simple_rgbw_pwm_inst0_context = {
  .red = &red_inst0,
  .green = &green_inst0,
  .blue = &blue_inst0,
  .white = &white_inst0,

  .timer = SL_SIMPLE_RGBW_PWM_LED_INST0_PERIPHERAL,
  .frequency = SL_SIMPLE_RGBW_PWM_LED_INST0_FREQUENCY,
  .resolution = SL_SIMPLE_RGBW_PWM_LED_INST0_RESOLUTION,
};

const sl_led_rgbw_pwm_t sl_inst0 = {
  .led_common.context = &simple_rgbw_pwm_inst0_context,
  .led_common.init = sl_simple_rgbw_pwm_led_init,
  .led_common.turn_on = sl_simple_rgbw_pwm_led_turn_on,
  .led_common.turn_off = sl_simple_rgbw_pwm_led_turn_off,
  .led_common.toggle = sl_simple_rgbw_pwm_led_toggle,
  .led_common.get_state = sl_simple_rgbw_pwm_led_get_state,
  .set_rgbw_color = sl_simple_rgbw_pwm_led_set_color,
  .get_rgbw_color = sl_simple_rgbw_pwm_led_get_color,
};



void sl_simple_rgbw_pwm_led_init_instances(void)
{

  sl_led_init((sl_led_t *)&sl_inst0);

}

Note

• The sl_simple_rgbw_pwm_led_instances.c file is shown with only one instance, but if more were in use they would all appear in this .c file.

// sl_simple_rgbw_pwm_led_instances.h

#ifndef SL_SIMPLE_RGBW_PWM_LED_INSTANCES_H
#define SL_SIMPLE_RGBW_PWM_LED_INSTANCES_H

#include "sl_simple_rgbw_pwm_led.h"

extern const sl_led_rgbw_pwm_t sl_inst0;

void sl_simple_rgbw_pwm_led_init_instances(void);

#endif // SL_SIMPLE_RGBW_PWM_LED_INIT_H

Note

• The sl_simple_rgbw_pwm_led_instances.h file is shown with only one instance, but if more were in use they would all appear in this .h file.

RGBW PWM LED Usage#

The RGBW PWM Led driver provides functionality for controlling Red/Green/Blue/White LEDs that are driven by PWM. The LEDs can be turned on and off and toggled, and remember their color and brightness state when being turned back on. The color and brightness can be set using values of 0-65535 for red, green, blue, and white. Retrieving the state gives the on/off value, while retrieving the color gives the rgbw values. The following code shows how to control these LEDs. An LED should always be initialized before calling any other functions with it.

// initialize rgbw LED
sl_led_init(&rgbw_led_inst0);

// turn on LED, set color to purple, turn off, toggle (would maintain purple color)
sl_led_turn_on(&rgbw_led_inst0);
uint16_t white = 65535; // max brightness
uint16_t red = 65535; // max red
uint16_t green = 0; // no green
uint16_t blue = 65535; // max blue
sl_led_set_rgbw_color(&rgbw_led_inst0, red, green, blue, white);
sl_led_turn_off(&rgbw_led_inst0);
sl_led_toggle(&rgbw_led_inst0);

// get the state of the led
sl_led_state_t state = sl_led_get_state(&rgbw_led_instance0);

Modules#

sl_simple_rgbw_pwm_led_context_t

sl_led_rgbw_pwm_t