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WS2812B是一种智能控制LED光源，其控制电路和RGB芯片集成在一个5050个组件的包装。 内部包括智能数字端口数据锁存和信号重塑放大驱动电路。 还包括一个精密内部振荡器和一个12V电压可编程恒流控制部分，有效地确保了像素点的光色高度一致。

如下是实测可用的STM32F103C8T6驱动LED驱动灯WS2812B的主要源码片段

void Timer2_init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* GPIOA Configuration: TIM2 Channel 1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Compute the prescaler value */
//PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 90-1; // 800kHz
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);

/* configure DMA */
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

/* DMA1 Channel6 Config */
DMA_DeInit(DMA1_Channel2);

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM2_CCR1_Address; // physical address of Timer 3 CCR1
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)LED_BYTE_Buffer; // this is the buffer memory
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // data shifted from memory to peripheral
DMA_InitStructure.DMA_BufferSize = 42;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // automatically increase buffer index
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // stop DMA feed after buffer size is reached
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel2, &DMA_InitStructure);

/* TIM3 CC1 DMA Request enable */
TIM_DMACmd(TIM2, TIM_DMA_Update, ENABLE);
}


void WS2812_send(uint8_t (*color)[3], uint16_t len)
{
uint8_t i;
uint16_t memaddr;
uint16_t buffersize;
buffersize = (len*24)+43; // number of bytes needed is #LEDs * 24 bytes + 42 trailing bytes
memaddr = 0; // reset buffer memory index

while (len)
{
for(i=0; i<8; i++) // GREEN data
{
LED_BYTE_Buffer[memaddr] = ((color[0][1]<
memaddr++;
}
for(i=0; i<8; i++) // RED
{
LED_BYTE_Buffer[memaddr] = ((color[0][0]<
memaddr++;
}
for(i=0; i<8; i++) // BLUE
{
LED_BYTE_Buffer[memaddr] = ((color[0][2]<
memaddr++;
}

len--;
}
//===================================================================//
//bug：最后一个周期波形不知道为什么全是高电平，故增加一个波形
LED_BYTE_Buffer[memaddr] = ((color[0][2]<<8) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
//===================================================================//
memaddr++;
while(memaddr < buffersize)
{
LED_BYTE_Buffer[memaddr] = 0;
memaddr++;
}

DMA_SetCurrDataCounter(DMA1_Channel2, buffersize); // load number of bytes to be transferred
DMA_Cmd(DMA1_Channel2, ENABLE); // enable DMA channel 6
TIM_Cmd(TIM2, ENABLE); // enable Timer 3
while(!DMA_GetFlagStatus(DMA1_FLAG_TC2)) ; // wait until transfer complete
TIM_Cmd(TIM2, DISABLE); // disable Timer 3
DMA_Cmd(DMA1_Channel2, DISABLE); // disable DMA channel 6
DMA_ClearFlag(DMA1_FLAG_TC2); // clear DMA1 Channel 6 transfer complete flag
}


int main(void)
{
delay_init(); //延时函数初始化
LED_Init(); //初始化与LED连接的硬件接口
Timer2_init();

while(1)
{
WS2812_send(r,10);
delay_ms(1000);
WS2812_send(g,10);
delay_ms(1000);
WS2812_send(b,10);
delay_ms(1000);
}
}