• 集成颜色解码接口，使用宏定义声明颜色，调用颜色解码接口即可显示出对应的颜色。
• 目前有三种流水样式，其他流水样式可以参考这三种流水样式做修改。

代码main.c

#include "ws2812.h"
int main(int argc, char const *argv[])
{
    printf("demo 1\n");
    //LEDC_LiuShui();
    //LED_LiuShui2();
    LiuSui3();
    return 0;
}

代码ws2812.h

#ifndef WS2812_H
#define WS2812_H


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>    
#include <sys/stat.h>    
#include <fcntl.h>

typedef unsigned char uint8;
typedef unsigned int uint32;

#define LED_NUM 32

#define LEDC_RED_PATH "/sys/class/leds/sunxi_led%dr/brightness"
#define LEDC_GREEN_PATH "/sys/class/leds/sunxi_led%dg/brightness"
#define LEDC_BLUE_PATH "/sys/class/leds/sunxi_led%db/brightness"

#define delay_ms(x)  (usleep(x*1000))

#define MediumTurquoise 0x48D1CC
#define Gold            0xFFD700
#define DarkGray        0xA9A9A9
#define Magenta         0xFF00FF
#define Yellow          0xFFFF00

int LED_LiuShui2();
int LEDC_LiuShui();
int LED_Color(int led,uint8 R,uint8 G,uint8 B);
int ColorDecode(uint32 color ,uint8 *R,uint8 *G,uint8 *B);
int LiuSui3();




#endif

代码ws2812.c

#include "ws2812.h"

static int export_fd;
static int color[3] = {0,0,255}; //RGB

int LED_LiuShui2(){
    int i;
    int mode = 0;
    int R= 0 ,G = 0,B = 0;
    while(1){
        if(i == 32)
        {
            i = 0;
            mode += 1;
        }
        if(mode == 0){
            R = 255; G = 0; B = 0;
        }
        if (mode == 1){
            R = 0; G = 255; B = 0;
        }
        if(mode == 2){
            R = 0; G = 0; B = 255;
        }
        if(mode == 3)
        {
            mode = 0;
            printf("delate 0\n");
        }
        LED_Color(i,R,G,B);
        i++;
        delay_ms(20);
    }
    return 1;
}

int LEDC_LiuShui(){
    int i = 0,len;
    char ledPath[45] = {0};
    char led_write[3] = {0};
    printf("demo 1 \n");
    while(1){
        for(i = 0 ; i < LED_NUM ; i++){
        printf("LED %d \n",i);
        sprintf(ledPath,LEDC_BLUE_PATH,i);
        export_fd = open(ledPath, O_WRONLY);
        if(-1 == export_fd)
        {
            printf("[%s]:[%d] open gpio direction file error\r\n", __FUNCTION__, __LINE__);
            return -1;
        }
        len = sprintf(led_write,"%d",color[2]);
        if(-1 == write(export_fd, led_write, len))
        {
            printf("[%s]:[%d] write operation direction error\r\n", __FUNCTION__, __LINE__);
            close(export_fd);
            return -1;
        }
        close(export_fd);
        if(i>3){
            sprintf(ledPath,LEDC_BLUE_PATH,i-3);
            export_fd = open(ledPath, O_WRONLY);
            if(-1 == export_fd)
            {
                printf("[%s]:[%d] open gpio direction file error\r\n", __FUNCTION__, __LINE__);
                return -1;
            }
            len = sprintf(led_write,"%d",0);
            if(-1 == write(export_fd, led_write, len))
            {
                printf("[%s]:[%d] write operation direction error\r\n", __FUNCTION__, __LINE__);
                close(export_fd);
                return -1;
            }
            close(export_fd);
        }
        else {
            sprintf(ledPath,LEDC_BLUE_PATH,i+29);
            export_fd = open(ledPath, O_WRONLY);
            if(-1 == export_fd)
            {
                printf("[%s]:[%d] open gpio direction file error\r\n", __FUNCTION__, __LINE__);
                return -1;
            }
            len = sprintf(led_write,"%d",0);
            if(-1 == write(export_fd, led_write, len))
            {
                printf("[%s]:[%d] write operation direction error\r\n", __FUNCTION__, __LINE__);
                close(export_fd);
                return -1;
            }
            close(export_fd);
        }
    
        
        delay_ms(50);
    }
    
    }
    printf("demo 1 end \n");
    return 1;
}



int LED_Color(int led,uint8 R,uint8 G,uint8 B)
{
    int len;
    char ledPath[45] = {0};
    char led_write[3] = {0};

    sprintf(ledPath,LEDC_BLUE_PATH,led);
    export_fd = open(ledPath, O_WRONLY);
    if(-1 == export_fd)
    {
        printf("[%s]:[%d] open gpio direction file error\r\n", __FUNCTION__, __LINE__);
        return -1;
    }
    len = sprintf(led_write,"%d",B);
    if(-1 == write(export_fd, led_write, len))
    {
        printf("[%s]:[%d] write operation direction error\r\n", __FUNCTION__, __LINE__);
        close(export_fd);
        return -1;
    }
    close(export_fd);

    sprintf(ledPath,LEDC_GREEN_PATH,led);
    export_fd = open(ledPath, O_WRONLY);
    if(-1 == export_fd)
    {
        printf("[%s]:[%d] open gpio direction file error\r\n", __FUNCTION__, __LINE__);
        return -1;
    }
    len = sprintf(led_write,"%d",G);
    if(-1 == write(export_fd, led_write, len))
    {
        printf("[%s]:[%d] write operation direction error\r\n", __FUNCTION__, __LINE__);
        close(export_fd);
        return -1;
    }
    close(export_fd);

    sprintf(ledPath,LEDC_RED_PATH,led);
    export_fd = open(ledPath, O_WRONLY);
    if(-1 == export_fd)
    {
        printf("[%s]:[%d] open gpio direction file error\r\n", __FUNCTION__, __LINE__);
        return -1;
    }
    len = sprintf(led_write,"%d",R);
    if(-1 == write(export_fd, led_write, len))
    {
        printf("[%s]:[%d] write operation direction error\r\n", __FUNCTION__, __LINE__);
        close(export_fd);
        return -1;
    }
    close(export_fd);
}


int ColorDecode(uint32 color ,uint8 *R,uint8 *G,uint8 *B){
    *R = (color >> 16) & 0x000011;
    *G = (color >> 8 ) & 0x000011;
    *B = (color >> 0 ) & 0x000011;
}

int LiuSui3(){
    int i;
    int mode = 0;
    uint8 R= 0 ,G = 0,B = 0;
    while(1){
        if(i == 32)
        {
            i = 0;
            mode += 1;
        }
        if(mode == 0){
            ColorDecode(MediumTurquoise,&R,&G,&B);
        }
        if (mode == 1){
            ColorDecode(Gold,&R,&G,&B);
        }
        if(mode == 2){
            ColorDecode(DarkGray,&R,&G,&B);
        }
        if(mode == 3)
        {
            mode = 0;
            printf("delate 0\n");
        }
        LED_Color(i,R,G,B);
        i++;
        delay_ms(20);
    }
    return 1;
}

Makefile

CC := riscv64-unknown-linux-gnu-gcc

target = ws2812

LDFLAGS ?= -lm
CFLAGS ?= -I .



CSRCS += ws2812.c
MAINSRC  = main.c


all : default


OBJEXT ?= .o

COBJS = $(CSRCS:.c=$(OBJEXT))
MAINOBJ = $(MAINSRC:.c=$(OBJEXT))

# SRCS =  $(CSRCS) $(MAINSRC)s
%.o: %.c
	@$(CC)  $(CFLAGS) -c $< -o $@
	@echo "CC $<"

default:  $(COBJS) $(MAINOBJ)
	$(CC) -o $(target) $(MAINOBJ)  $(COBJS) $(LDFLAGS)
	

clean: 
	rm -f $(target) $(AOBJS) $(COBJS) $(MAINOBJ)