WS2811 and WS21812B smart LED driver for STM32

CubeMX setup:

• Set PWM timer with 800 kHz frequency using only the autoReload register, with prescaler = 0. Overclocking up to 1.2 MHz frequency can be achieved, but results may vary
• Enable auto-reload preload
• Set DMA Memory->Peripheral in circular mode, with peripheral data width Word and memory data width Byte and with "Increment address" selected for memory

Example usage:

• Initialization:

  /* initialize LED strip */
  smartLED_t LEDstrip;
  LEDstrip.chip = WS2812B;
  LEDstrip.type = SMARTLED_RGB;
  LEDstrip.size = 30;
  LEDstrip.htim = &htim1;
  LEDstrip.timType = SMARTLED_TIMER_EXTENDED;
  LEDstrip.timChannel = TIM_CHANNEL_3;
  LEDstrip.LEDperIRQ = 8;
  
  /* LED Strip initialization, after MX_TIM1_Init();*/
  if (smartLED_init(&LEDstrip) != SMARTLED_SUCCESS) {
      while (1);
  }

• Interrupt Handlers:

  void HAL_TIM_PWM_PulseFinishedHalfCpltCallback(TIM_HandleTypeDef* htim) {
      /* Process LED strip */
      if (htim->Instance == htim1.Instance) {
          smartLED_updateTransfer(&LEDstrip, SMARTLED_IRQ_HALFCPLT);
      }
  }
  
  void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef* htim) {
      /* Process LED strip */
      if (htim->Instance == htim1.Instance) {
          smartLED_updateTransfer(&LEDstrip, SMARTLED_IRQ_FINISHED);
      }
  }

• Transmit data:

  smartLED_updateAllRGBColors(&LEDstrip, 0, 0, 0);
  while (smartLED_startTransfer(&LEDstrip) != SMARTLED_SUCCESS) {
      HAL_Delay(10);
  }

Configurable parameters

Parameter name	Description	Values
chip	Type of chip to be controlled	WS2811 or WS2812B
type	Type of LED device: RGB or RGBW	SMARTLED_RGB or SMARTLED_RGBW
size	Number of LEDs	#
htim	Pointer to PWM timer handle	&htim1
timType	Type of PWM timer: normal or extended (N channels)	SMARTLED_TIMER_NORMAL or SMARTLED_TIMER_EXTENDED
timChannel	Timer channel number	TIM_CHANNEL_3
LEDperIRQ	Number of LED blocks to be sent between two consecutive interrupts	Suggested from 5 to 10