今天心血来潮花了点时间写了个WS2812B的驱动，把灯点亮了。
WS2812B是一款全彩LED控制IC，单总线控制，信号时序如下图，其它信息请看规格书，要注意高低电平的时间一定要控制在规格书的要求范围内。WS2812B可以级联，每个灯接收的是24bit数据（GRB颜色值），D1灯在收到24bit数据后，会把数据保存，如果还收到数据，会通过DO脚传给D2
用STM32F0芯片，48M时钟，驱动代码如下：
头文件：
/************************************************************
Copyright (C), 2013-2020, XINZHIYIKONG.Co.,Ltd.
@FileName: WS2812B.h
@Author : 糊读虫 QQ:570525287
@Version : 1.0
@Date : 2020-12-25
@Description: WS2812B全彩LED灯驱动
@Function List:
@History :
<author> <time> <version > <desc>
***********************************************************/
#ifndef __WS2812B_H
#define __WS2812B_H
#include "stm32f0xx.h"
#include "sys.h"
//WS2812B IO 定义 注意初始化APB时钟也要修改
#define WS2812B_PORT GPIOA
#define WS2812B_PIN GPIO_Pin_15
#define WS2812B_RCC_AHB RCC_AHBPeriph_GPIOA //RCC时钟
#define WS2812B_Hi() WS2812B_PORT->BSRR=WS2812B_PIN //GPIO_ResetBits(LED1_PORT, LED1_PIN)
#define WS2812B_Low() WS2812B_PORT->BRR=WS2812B_PIN //GPIO_SetBits(LED1_PORT, LED1_PIN)
//颜色
typedef struct color{
u8 G;
u8 R;
u8 B;
}Color_TypeDef;
//------------------------
#define PIXEL_NUM 59 //LED灯的个数
void WS2812B_Init(void);
void WS2812B_Reset(void);
void WS2812B_WriteColor(Color_TypeDef *pColor);
void WS2812B_RefreshPixel(void);
void WS2812B_FillColor(u16 start,u16 end,Color_TypeDef *pColor);
void WS2812B_MovePixel(u8 dir);
void WS2812B_Test(void);
#endif /* __WS2812B_H */
源文件
/************************************************************
Copyright (C), 2013-2020, XINZHIYIKONG.Co.,Ltd.
@FileName: WS2812B.c
@Author : 糊读虫 QQ:570525287
@Version : 1.0
@Date : 2020-12-25
@Description: WS2812B全彩LED灯驱动
@Function List:
@History :
<author> <time> <version > <desc>
***********************************************************/
#include "WS2812B.h"
Color_TypeDef PixelBuf[PIXEL_NUM]; //像数数据
uint8_t flag;
//晶振48M,每个nop是20.83ns
#define DELAY_20_8nS __nop() //1个nop是20.8ns
#define DELAY_104nS DELAY_20_8nS;DELAY_20_8nS;DELAY_20_8nS;DELAY_20_8nS;DELAY_20_8nS //5个nop是104ns
#define Delay_320nS() DELAY_104nS;DELAY_104nS;DELAY_104nS //30个nop
/*---------------------------------------------------------------------------
@Function :Delay_850nS
@Description:检测开关初始化
@Input :无
@Retrun :无
@Others :T1H T0L 时间在 580ns~1.6us,取850ns 实测855us
----------------------------------------------------------------------------*/
void Delay_850nS(void)
{
//进入函数所用的时间约为310ns
DELAY_104nS;
DELAY_104nS;
Delay_320nS();
DELAY_20_8nS;
}
/*---------------------------------------------------------------------------
@Function :Delay_300uS
@Description:
@Input :无
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void Delay_300uS(void)
{
uint8_t i;
while(i--)
{
Delay_320nS();
}
}
/*---------------------------------------------------------------------------
@Function :WS2812B_Init
@Description:初始化
@Input :无
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
RCC_AHBPeriphClockCmd(WS2812B_RCC_AHB, ENABLE);
GPIO_InitStruct.GPIO_Pin = WS2812B_PIN ;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_Speed =GPIO_Speed_Level_3;
GPIO_Init(WS2812B_PORT, &GPIO_InitStruct);
GPIO_SetBits(WS2812B_PORT, WS2812B_PIN);
}
/*---------------------------------------------------------------------------
@Function :WS2812B_Reset
@Description:复位
@Input :无
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_Reset(void) //复位函数
{
WS2812B_Low();
Delay_300uS();
}
/*---------------------------------------------------------------------------
@Function :WS2812B_WriteByte
@Description:写一个字节
@Input :无
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_WriteByte(uint8_t dat)
{
u8 i;
for (i=0;i<8;i++)
{
//先发送高位
if (dat & 0x80) //1
{
WS2812B_Hi();
Delay_850nS(); //T1H
WS2812B_Low();
Delay_320nS(); //T1L
}
else //0
{
WS2812B_Hi();
Delay_320nS(); //T0H
WS2812B_Low();
Delay_850nS(); //T0L
}
dat<<=1;
}
}
/*---------------------------------------------------------------------------
@Function :WS2812B_WriteColor
@Description:写入1个24bit颜色数据
@Input :无
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_WriteColor(Color_TypeDef *pColor)
{
WS2812B_WriteByte(pColor->G);
WS2812B_WriteByte(pColor->R);
WS2812B_WriteByte(pColor->B);
}
/*---------------------------------------------------------------------------
@Function :WS2812B_RefreshPixel
@Description:更新显示
@Input :无
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_RefreshPixel(void)
{
u8 i;
for(i=0;i<PIXEL_NUM;i++)
{
WS2812B_WriteColor(&PixelBuf[i]);
}
}
//----------------------------------------
void WS2812B_Test(void)
{
u8 i;
Color_TypeDef temp;
temp.B = 0x50;
temp.R = 0x60;
temp.G = 0x70;
for(i=0;i<60;i++)
{
WS2812B_WriteColor(&temp);
}
}
//测试延时时间
void WS2812B_Test2(void)
{
WS2812B_Hi();
Delay_850nS();
WS2812B_Low();
}
//============================================================================
void Copy_Color(Color_TypeDef *pDst,Color_TypeDef *pScr)
{
pDst->R = pScr->R;
pDst->G = pScr->G;
pDst->B = pScr->B;
}
/*---------------------------------------------------------------------------
@Function :WS2812B_FillColor
@Description:填充颜色
@Input :start：开始位置;end:结束信置;pColor:颜色值
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_FillColor(u16 start,u16 end,Color_TypeDef *pColor)
{
if (start > end) //交换位置
{
u16 temp;
temp = start;
start = end;
end = temp;
}
if (start >= PIXEL_NUM)return; //超出范围
if (end >= PIXEL_NUM)end = PIXEL_NUM-1;
//填充颜色值
while(start <= end)
{
Copy_Color(&PixelBuf[start],pColor);
start++;
}
}
/*---------------------------------------------------------------------------
@Function :WS2812B_MovePixel
@Description:循环移动像素颜色
@Input :dir:方向;
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
void WS2812B_MovePixel(u8 dir)
{
Color_TypeDef temp;
u8 i;
if (dir) //向左移动
{
Copy_Color(&temp,&PixelBuf[PIXEL_NUM-1]);
i = PIXEL_NUM-1;
while(i)
{
Copy_Color(&PixelBuf[i],&PixelBuf[i-1]);
i--;
}
Copy_Color(&PixelBuf[0],&temp);
}
else //向右移动
{
Copy_Color(&temp,&PixelBuf[0]);
i = 0;
while(i < (PIXEL_NUM-1))
{
Copy_Color(&PixelBuf[i],&PixelBuf[i+1]);
i++;
}
Copy_Color(&PixelBuf[PIXEL_NUM-1],&temp);
}
}
//----------------------------------END OF FILE------------------------------
/*---------------------------------------------------------------------------
@Function :main
@Description:主函数
@Input :
@Retrun :无
@Others :
----------------------------------------------------------------------------*/
int main(void)
{
Color_TypeDef temp;
HardWare_Init();
WS2812B_Init();
temp.R = 0x00;
temp.G = 0xff;
temp.B = 0x80;
WS2812B_FillColor(10,20,&temp);
while(1)
{
if (SysGetSignal_ms(20,0)) //20ms
{
WS2812B_MovePixel(1);
WS2812B_RefreshPixel();
}
}
}
代码实现了循环移动的流水灯功能，点亮效果：
