點燈，嵌入式工程師難以割舍的獨有情懷。也只有他們才能這么大膽，用耀眼綠光在溫馨霓虹中跳脫閃現，變幻中演繹與眾不同的浪漫愛意。

520點燈表白，為愛發光——今晚就脫單！快來~

本教程示例采用合宙LuatOS-SoC系列Air105開發板、WS2812系列LED光源演示

1

LuatOS-SoC驅動WS2812的三種方式

WS2812是一款比較常用的外控集成LED光源，控制簡單，應用領域極廣——包括但不限于表白。

具有低電壓驅動、環保節能、亮度高、散射角度大、一致性好、低功率及超長壽命等優點。

驅動WS2812需要滿足如下條件，顯然不是所有MCU都能支持的：

LuatOS-SoC三種驅動方式

合宙LuatOS-SoC在支持GPIO直驅的情況下，加入了PWM和SPI驅動的方法：

sensor.ws2812b_pwm(pin,data)

sensor.ws2812b_spi(pin,data)

下面看看這兩個函數對硬件要求：

sensor.ws2812b_pwm(pin,data)：
800k的PWM輸出頻率

sensor.ws2812b_spi(pin,data)：
5Mbps的SPI輸出速率

顯然，這要求就很低了。三種驅動方式，總有一款適合你：

Air101/Air103系列：

推薦使用SPI驅動方式；

Air105系列：

推薦使用PWM驅動方式，也可使用SPI驅動方式；GPIO直驅也可以，但實際有點勉強。

2

520表白程序開發/demo下載

接下來，我們正式編寫表白程序。

01

首先將我們要顯示的內容，換算成GBR顏色數組：

local show_520 = {
{0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x0000ff,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x00ff00,0x0000ff,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x0000ff,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x00ff00,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff},
{0x0000ff,0x0000ff,0x0000ff,0x00ff00,0x00ff00,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff,0x0000ff},

}local show_520_w = 24local show_520_h = 8

02之后，申請一個8*8的zbuff空間：

local ws2812_w = 8local ws2812_h = 8
local buff = zbuff.create({ws2812_w,ws2812_h,24},0x000000)

03然后，我們做一個簡單的滾動顯示函數就可以了：

local function ws2812_roll_show(show_data,data_w)
local m = 0
while 1 do
for j=0,ws2812_w-1 do
if j%2==0 then
for i=ws2812_w-1,0,-1 do
if m+ws2812_w-i>data_w then
buff:pixel(i,j,show_data[j+1][m+ws2812_w-i-data_w]) else
buff:pixel(i,j,show_data[j+1][m+ws2812_w-i]) end
end
else
for i=0,ws2812_w-1 do
if m+i+1>data_w then
buff:pixel(i,j,show_data[j+1][m+i+1-data_w]) else
buff:pixel(i,j,show_data[j+1][m+i+1]) end
end
end
end
m = m+1
if m==data_w then m=0 end
sensor.ws2812b_pwm(5,buff)--此處使用pwm方法驅動,當然也可以用gpio,spi方式,API詳情查看wiki https://wiki.luatos.com/api/sensor.html
-- sensor.ws2812b_spi(0,buff)

sys.wait(300)
end
end

好，我們的點燈表白程序寫好了。前面沒看視頻的同學，來看一下點燈效果吧：

每個閃耀的LED，都是滿滿愛意

你學會了嗎？

快來試試看！

發揮你的點燈創意為愛發光吧