Simple RGB PWM LED Driver#

Simple Red/Green/Blue PWM LED Driver.

Introduction#

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

RGB PWM LED Configuration#

RGB PWM LEDs use the sl_led_t struct, and their own structs sl_simple_rgb_pwm_led_context_t and sl_led_rgb_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_rgb_pwm_led_instances.c

#include "em_gpio.h"
#include "sl_simple_rgb_pwm_led.h"

#include "sl_simple_rgb_pwm_led_inst0_config.h"



sl_led_pwm_t red_inst0 = {
  .port = SIMPLE_RGB_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGB_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGB_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGB_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGB_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGB_PWM_LED_INST0_LOC,
#endif
};

sl_led_pwm_t green_inst0 = {
  .port = SIMPLE_RGB_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGB_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGB_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGB_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGB_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGB_PWM_LED_INST0_LOC,
#endif
};

sl_led_pwm_t blue_inst0 = {
  .port = SIMPLE_RGB_PWM_LED_INST0_PORT,
  .pin = SIMPLE_RGB_PWM_LED_INST0_PIN,
  .polarity = SIMPLE_RGB_PWM_LED_INST0_POLARITY,
  .channel = SIMPLE_RGB_PWM_LED_INST0_CHANNEL,
#if defined(SL_SIMPLE_RGB_PWM_LED_INST0_RED_LOC)
  .location = SIMPLE_RGB_PWM_LED_INST0_LOC,
#endif
};

sl_simple_rgb_pwm_led_context_t simple_rgb_pwm_inst0_context = {
  .red = &red_inst0,
  .green = &green_inst0,
  .blue = &blue_inst0,

  .timer = SL_SIMPLE_RGB_PWM_LED_INST0_PERIPHERAL,
  .frequency = SL_SIMPLE_RGB_PWM_LED_INST0_FREQUENCY,
  .resolution = SL_SIMPLE_RGB_PWM_LED_INST0_RESOLUTION,
};

const sl_led_rgb_pwm_t sl_inst0 = {
  .led_common.context = &simple_rgb_pwm_inst0_context,
  .led_common.init = sl_simple_rgb_pwm_led_init,
  .led_common.turn_on = sl_simple_rgb_pwm_led_turn_on,
  .led_common.turn_off = sl_simple_rgb_pwm_led_turn_off,
  .led_common.toggle = sl_simple_rgb_pwm_led_toggle,
  .led_common.get_state = sl_simple_rgb_pwm_led_get_state,
  .set_rgb_color = sl_simple_rgb_pwm_led_set_color,
  .get_rgb_color = sl_simple_rgb_pwm_led_get_color,
};



void sl_simple_rgb_pwm_led_init_instances(void)
{

  sl_led_init((sl_led_t *)&sl_inst0);

}

Note

• The sl_simple_rgb_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_rgb_pwm_led_instances.h

#ifndef SL_SIMPLE_RGB_PWM_LED_INSTANCES_H
#define SL_SIMPLE_RGB_PWM_LED_INSTANCES_H

#include "sl_simple_rgb_pwm_led.h"

extern const sl_led_rgb_pwm_t sl_inst0;

void sl_simple_rgb_pwm_led_init_instances(void);

#endif // SL_SIMPLE_RGB_PWM_LED_INIT_H

Note

• The sl_simple_rgb_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.

RGB PWM LED Usage#

The RGB 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 rgb values. The following code shows how to control these LEDs. An LED should always be initialized before calling any other functions with it.

// initialize rgb LED
sl_led_init(&rgb_led_inst0);

// turn on LED, set color to purple, turn off, toggle (would maintain purple color)
sl_led_turn_on(&rgb_led_inst0);
uint16_t red = 65535; // max red
uint16_t green = 0; // no green
uint16_t blue = 65535; // max blue
sl_led_set_rgb_color(&rgb_led_inst0, red, green, blue);
sl_led_turn_off(&rgb_led_inst0);
sl_led_toggle(&rgb_led_inst0);

// get the state of the led
sl_led_state_t state = sl_led_get_state(&rgb_led_inst0);

Modules#

sl_simple_rgb_pwm_led_context_t

sl_led_rgb_pwm_t

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