BPI-Leaf-S3 有两颗按键，BOOT 与 RST，RST控制芯片硬件复位，而BOOT则与GPIO0相连，其电路如下图所示。
可见当开发板正常通电工作时，GPIO0在BOOT按键未按下时，串联一颗电阻接到3.3v，此时为高电位；当BOOT按键按下时，GPIO0将直接接地，此时则为低电位。ESP32-S3芯片通过检测此GPIO管脚的电位即可判断按钮是否被按下。
MicroPython
Micropython 运行环境搭建 - Banana Pi Wiki (banana-pi.org)
MicroPython GPIO中断程序 machine.Pin.irq 文档
在程序中，通过检测 GPIO中断的触发方式，即可设计一套记录按键被按压的次数的中断程序，用判断当前已经按压的次数来控制彩灯的颜色。
from machine import Pin
from neopixel import NeoPixel
from array import array
import time
import micropython
micropython.alloc_emergency_exception_buf(100)
p_48 = Pin(48, Pin.OUT)
np = NeoPixel(p_48, 1,bpp=3, timing=1)
p0 = Pin(0,Pin.IN,Pin.PULL_UP)
trig_locks = array('B',[0])
trig_timeticks_list = array('L',[0,0])
count = array('L',[0])
def p0_irq(pin):
if pin.value()==0 and trig_locks[0]==0:
trig_timeticks_list[0]=time.ticks_ms()
trig_locks[0]=1
elif pin.value()==1 and trig_locks[0]==1:
trig_timeticks_list[1]=time.ticks_diff(time.ticks_ms(),trig_timeticks_list[0])
trig_locks[0]=0
if trig_timeticks_list[1] >= 20:
count[0] = count[0] + 1
if count[0] > 8:
count[0] = 0
p0.irq(handler=p0_irq,trigger= Pin.IRQ_FALLING | Pin.IRQ_RISING )
RED = (255, 0, 0)
ORANGE = (255, 100, 0)
YELLOW = (255, 255, 0)
GREEN = (0, 255, 0)
CYAN = (0, 255, 255)
BLUE = (0, 0, 255)
PURPLE = (180, 0, 255)
WHITE = (255, 255, 255)
OFF = (0, 0, 0)
color_list = [RED,ORANGE,YELLOW,GREEN,CYAN,BLUE,PURPLE,WHITE,OFF]
brightness = 0.1
while True:
print (count)
i = color_list[count[0]]
color = (round(i[0]*brightness),round(i[1]*brightness),round(i[2]*brightness))
np[0] = color
np.write()
time.sleep(0.1)