• ESP8266--SDK开发（驱动WS2812B）

    文章目录

    一、WS2812彩灯介绍

    WS2812是一个集控制电路与发光电路于一体的智能外控LED光源，外型与5050LED灯珠相同，每个灯珠都是一个像素点。像素点内包含数字接口、数据锁存、信号整形放大驱动电路，还包含高精度的内部振荡器和12V高压可编程定电流控制部分。
    在这里插入图片描述
    数据协议采用单线归零码的通讯方式，像素点在上电复位以后，DIN端接受从控制器传输过来的数据，首先送过来的24bit数据被第一个像素点提取后，送到像素点内部的数据锁存器，剩余的数据经过内部整形处理电路整形放大后通过DO端口开始转发输出给下一个级联的像素点，每经过一个像素点的传输，信号减少24bit。像素点采用自动整形转发技术，使得该像素点的级联个数不受信号传送的限制，仅仅受限信号传输速度要求。
    在这里插入图片描述

    按照数据传输协议即可对WS2812进行驱动，当然对于WS2812有许多开源的驱动库，例如：Adafruit_NeoPixel驱动库

    #ifndef _Adafruit_NeoPixel_H
#define _Adafruit_NeoPixel_H

#include "c_types.h"
#include "user_interface.h"
#include "ets_sys.h"
#include "gpio.h"

//thanks for https://github.com/cnlohr/ws2812esp8266
//thanks for https://github.com/adafruit/Adafruit_NeoPixel

#define WSGPIO 0 //must use the ESP8266 GPIO0 as the pin to drive WS2812B RGB LED!!!
//user can change
#define PIXEL_MAX 1//the total numbers of LEDs you are used in your project

//You will have to 	os_intr_lock();  	os_intr_unlock();

void setAllColor(uint8_t r, uint8_t g, uint8_t b);
void setOneColor(uint16_t n, uint32_t c);
//void setAllColor(uint32_t c);
void cleanOneColor(uint16_t n, uint32_t c);
void cleanAllColor(void);

void setAllPixel(void);

uint32_t Color(uint8_t r, uint8_t g, uint8_t b);
uint32_t Wheel(uint8_t WheelPos);
void rainbowCycle(uint8_t wait) ;
void theaterChase(uint32_t c, uint8_t wait);
void theaterChaseRainbow(uint8_t wait);
void colorWipe(uint32_t c, uint8_t wait);
void WS2812B_Test(void);
void ICACHE_FLASH_ATTR WS2812B_Init(void);

uint32_t changeL(uint32_t rgb, float k);

#endif

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    #include "driver/Adafruit_NeoPixel.h"
#include "ets_sys.h"
#include "osapi.h"
/*
 #define GPIO_OUTPUT_SET(gpio_no, bit_value) \
	gpio_output_set(bit_value<

//I just used a scope to figure out the right time periods.
void SEND_WS_0() {
	uint8_t time;
	time = 3;
	while (time--)
		WRITE_PERI_REG(PERIPHS_GPIO_BASEADDR + GPIO_ID_PIN(WSGPIO), 1);
	time = 7;
	while (time--)
		WRITE_PERI_REG(PERIPHS_GPIO_BASEADDR + GPIO_ID_PIN(WSGPIO), 0);
}

void SEND_WS_1() {
	uint8_t time;
	time = 7;
	while (time--)
		WRITE_PERI_REG(PERIPHS_GPIO_BASEADDR + GPIO_ID_PIN(WSGPIO), 1);
	time = 3;
	while (time--)
		WRITE_PERI_REG(PERIPHS_GPIO_BASEADDR + GPIO_ID_PIN(WSGPIO), 0);
}

void // ICACHE_FLASH_ATTR
WS2812Send_8bit(uint8_t dat) {
	uint16_t i;
	GPIO_OUTPUT_SET(GPIO_ID_PIN(WSGPIO), 0);
	ets_intr_lock();
	uint8_t mask = 0x80;
	uint8_t byte = dat;
	while (mask) {
		if (byte & mask)
			SEND_WS_1();
		else
			SEND_WS_0();
		mask >>= 1;
	}

	ets_intr_unlock();
}

//GRB format,MSB firsr.
void //ICACHE_FLASH_ATTR
WS2812BSend_24bit(uint8_t R, uint8_t G, uint8_t B) {
	WS2812Send_8bit(G);
	WS2812Send_8bit(R);
	WS2812Send_8bit(B);
}
//delay for millisecond
void HAL_Delay(int time) {
	os_delay_us(time * 1000);
}

static uint8_t rBuffer[PIXEL_MAX] = { 0 };
static uint8_t gBuffer[PIXEL_MAX] = { 0 };
static uint8_t bBuffer[PIXEL_MAX] = { 0 };

void setAllColor(uint8_t r, uint8_t g, uint8_t b)
{
	uint8_t i;
	for (i = 0; i < PIXEL_MAX; i++) {
		rBuffer[i] = r;
		gBuffer[i] = g;
		bBuffer[i] = b;
	}
}

void setOneColor(uint16_t n, uint32_t c) {
	rBuffer[n] = (uint8_t) (c >> 16);
	gBuffer[n] = (uint8_t) (c >> 8);
	bBuffer[n] = (uint8_t) c;
}

//void setAllColor(uint32_t c) {
//	uint8_t r, g, b;
//	r = (uint8_t) (c >> 16);
//	g = (uint8_t) (c >> 8);
//	b = (uint8_t) c;
//	uint8_t i;
//	for (i = 0; i < PIXEL_MAX; i++) {
//		rBuffer[i] = r;
//		gBuffer[i] = g;
//		bBuffer[i] = b;
//	}
//}

void cleanOneColor(uint16_t n, uint32_t c) {
	rBuffer[n] = 0;
	gBuffer[n] = 0;
	bBuffer[n] = 0;
}

void cleanAllColor() {
	uint8_t i;
	for (i = 0; i < PIXEL_MAX; i++) {
		rBuffer[i] = 0;
		gBuffer[i] = 0;
		bBuffer[i] = 0;
	}
}

void setAllPixel(void) {
	uint8_t i;
	for (i = 0; i < PIXEL_MAX; i++) {
		WS2812BSend_24bit(rBuffer[i], gBuffer[i], bBuffer[i]);
	}
}

uint32_t Color(uint8_t r, uint8_t g, uint8_t b) {
	return ((uint32_t) r << 16) | ((uint32_t) g << 8) | b;
}
uint32_t Wheel(uint8_t WheelPos) {
	WheelPos = 255 - WheelPos;
	if (WheelPos < 85) {
		return Color(255 - WheelPos * 3, 0, WheelPos * 3);
	}
	if (WheelPos < 170) {
		WheelPos -= 85;
		return Color(0, WheelPos * 3, 255 - WheelPos * 3);
	}
	WheelPos -= 170;
	return Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}

void rainbow(uint8_t wait) {
	uint16_t i, j;
	for (j = 0; j < 256; j++) {
		for (i = 0; i < PIXEL_MAX; i++) {
			setOneColor(i, Wheel((i + j) & 255));
		}
		HAL_Delay(wait);
	}
	setAllPixel();
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
	uint16_t i, j;

	for (j = 0; j < 256 * 5; j++) { // 5 cycles of all colors on wheel
		for (i = 0; i < PIXEL_MAX; i++) {
			setOneColor(i, Wheel(((i * 256 / PIXEL_MAX) + j) & 255));
		}
		HAL_Delay(wait);
	}
	setAllPixel();
}
//Theatre-style crawling lights.o??¨¹¦Ì?
void theaterChase(uint32_t c, uint8_t wait) {
	int i, j, q;
	for (j = 0; j < 10; j++) {  //do 10 cycles of chasing
		for (q = 0; q < 3; q++) {
			for (i = 0; i < PIXEL_MAX; i = i + 1)  //turn every one pixel on
					{
				setOneColor(i + q, c);
			}
			HAL_Delay(wait);

			for (i = 0; i < PIXEL_MAX; i = i + 1) //turn every one pixel off
					{
				setOneColor(i + q, 0);
			}
		}
	}
	setAllPixel();
}

//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
	int i, j, q;
	for (j = 0; j < 256; j++) {     // cycle all 256 colors in the wheel
		for (q = 0; q < 3; q++) {
			for (i = 0; i < PIXEL_MAX; i = i + 1) //turn every one pixel on
					{
				setOneColor(i + q, Wheel((i + j) % 255));
			}

			HAL_Delay(wait);

			for (i = 0; i < PIXEL_MAX; i = i + 1) //turn every one pixel off
					{
				setOneColor(i + q, 0);
			}
		}
	}
	setAllPixel();
}
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
	uint16_t i = 0;
	for (i = 0; i < PIXEL_MAX; i++) {
		setOneColor(i, c);
		HAL_Delay(wait);
	}
}

void //ICACHE_FLASH_ATTR
WS2812B_Init(void) {
	setAllColor(0,0,0);
	setAllPixel();
}

void WS2812B_Test(void) {
	HAL_Delay(500);
	rainbowCycle(20);
	theaterChaseRainbow(50);
}

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    使用注意事项

    1、将文件复制到自己的SDK工程

    复制文件到文件夹，Clean Project一下就会自动加载到IDE中

    在这里插入图片描述
    在这里插入图片描述

    2、WS2812B的数据线一定要使用GPIO0

    在这里插入图片描述

    3、设置WS2812B的小灯个数

    在这里插入图片描述

    4、导入头文件并初始化

    #include "driver/Adafruit_NeoPixel.h"

//初始化GPIO0
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0);
GPIO_OUTPUT_SET(0, 0);
os_delay_us(200);

//初始化WS2812B
WS2812B_Init();

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    5、设置/清除RGB的值

    设置了RGB的值，只是将颜色值写入颜色缓存数组而已，必须发送到WS2812B才能改变颜色

    在这里插入图片描述

    5、发送RGB的值

    在这里插入图片描述

    二、效果展示

    在这里插入图片描述

    三、七色灯代码

    #include "driver/Adafruit_NeoPixel.h"

/******************************************************************************
 * FunctionName : user_init
 * Description  : entry of user application, init user function here
 * Parameters   : none
 * Returns      : none
*******************************************************************************/
void ICACHE_FLASH_ATTR
user_init(void)
{
	uart_init(115200,115200);
	os_delay_us(1000);
	os_printf("\r\n=================================================\r\n");
	os_printf("\t Project:\t%s\r\n", ProjectName);
	os_printf("\t SDK version:\t%s", system_get_sdk_version());
	os_printf("\r\n=================================================\r\n");

	PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0);
	GPIO_OUTPUT_SET(0, 0);
	os_delay_us(200);

	WS2812B_Init();

	while(1) {
		//红
		setAllColor(255,0,0);
		setAllPixel();
		os_delay_us(300000);

		//橙
		setAllColor(255,165,0);
		setAllPixel();
		os_delay_us(300000);

		//黄
		setAllColor(255,255,0);
		setAllPixel();
		os_delay_us(300000);

		//绿
		setAllColor(0,255,0);
		setAllPixel();
		os_delay_us(300000);

		//蓝
		setAllColor(0,0,255);
		setAllPixel();
		os_delay_us(300000);

		//靛
		setAllColor(0,255,255);
		setAllPixel();
		os_delay_us(300000);

		//紫
		setAllColor(139,0,255);
		setAllPixel();
		os_delay_us(300000);
	}
}

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    附：彩虹七色码值

    彩虹七色16进制码：
    红色 #FF0000
    橙色 #FF7F00
    黄色 #FFFF00
    绿色 #00FF00
    青色 #00FFFF
    蓝色 #0000FF
    紫色 #8B00FF

    彩虹七色RGB值：
    赤色 【RGB】255, 0, 0
    橙色 【RGB】 255, 165, 0
    黄色 【RGB】255, 255, 0
    绿色 【RGB】0, 255, 0
    青色 【RGB】0, 255, 255
    蓝色 【RGB】0, 0, 255
    紫色 【RGB】139, 0, 255

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  • 原文地址：https://blog.csdn.net/Mr_robot_strange/article/details/127727530