查看“指间ESP触摸片与蜂鸣器操作”的源代码

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<p style="color: #4F4E4E;font-size:220%">'''指间ESP按键操作'''</p>
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指间ESP开发板板载了五个触摸按键，分别对应2、14、27、33、32，该示例展示了如何读取触摸状态并反映在蜂鸣器上
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<source lang="c++">
import machine, display
from machine import Pin, PWM

tc0 = machine.TouchPad(Pin(32))
tc1 = machine.TouchPad(Pin(33))
tc2 = machine.TouchPad(Pin(27))
tc3 = machine.TouchPad(Pin(14))
tc4 = machine.TouchPad(Pin(2))
bkcolor = 0x333333

music = PWM(Pin(4))
music.duty(0)

touchli = [False, False, False, False, False]
notes = [523, 587, 659, 698, 784, 880]

tft = display.TFT()
tft.init(tft.ST7789)
  
tft.clear()
tft.rect(0, 0, 240, 240, bkcolor, bkcolor)
def getTouch():
    if tc0.read() < 100:
        touchli[0] = True
    else:
        touchli[0] = False
    if tc1.read() < 100:

        touchli[1] = True
    else:
        touchli[1] = False
    if tc2.read() < 100:
        touchli[2] = True
    else:
        touchli[2] = False
        touchli[2] = False
    if tc3.read() < 100:
        touchli[3] = True
    else:
        touchli[3] = False
    if tc4.read() < 100:

        touchli[4] = True
    else:
        touchli[4] = False

while True:
  getTouch()
  for i in range(5):
    if touchli[i]:
      tft.rect(10 + 45 * i, 190, 40, 25, bkcolor, 0x00F0F0)
      music.duty(50)
      music.freq(notes[i])
    else:
      tft.rect(10 + 45 * i, 190, 40, 25, bkcolor, 0xF0F000)
    if (
      (not touchli[0])
      and (not touchli[1])
      and (not touchli[2])
      and (not touchli[3])
      and (not touchli[4])
    ):
      music.duty(0)
</source>
**该程序使用板载TFT屏幕画出两个圆角矩形用于标识状态，非按下时为青色，按下时为黄色。
[[File:Tftbuzzertouch.png|600px|center]]
程序详解：import为引用所需文件，包括display（屏幕驱动），Pin（IO口驱动）、蜂鸣器PWM驱动
<source lang="c++">
import machine, display
from machine import Pin, PWM
</source>
之后声明5个触摸按键
<source lang="c++">
tc0 = machine.TouchPad(Pin(32))
tc1 = machine.TouchPad(Pin(33))
tc2 = machine.TouchPad(Pin(27))
tc3 = machine.TouchPad(Pin(14))
tc4 = machine.TouchPad(Pin(2))
</source>
初始化TFT并使用背景色"bkcolor"填充屏幕
<source lang="c++">
bkcolor = 0x333333

tft = display.TFT()
tft.init(tft.ST7789)

tft.clear()
tft.rect(0, 0, 240, 240, bkcolor, bkcolor)
</source>
声明触摸状态数组与蜂鸣器音色数组
<source lang="c++">
touchli = [False, False, False, False, False]
notes = [523, 587, 659, 698, 784, 880]
</source>

编写gettouch函数，按下为true，否则为false
<source lang="c++">
def getTouch():
    if tc0.read() < 100:
        touchli[0] = True
    else:
        touchli[0] = False
    if tc1.read() < 100:

        touchli[1] = True
    else:
        touchli[1] = False
    if tc2.read() < 100:
        touchli[2] = True
    else:
        touchli[2] = False
        touchli[2] = False
    if tc3.read() < 100:
        touchli[3] = True
    else:
        touchli[3] = False
    if tc4.read() < 100:

        touchli[4] = True
    else:
        touchli[4] = False
</source>

主程序中扫描触摸片，按下则绘制黄色矩形，否则绘制青色矩形
<source lang="c++">
while True:
  getTouch()
  for i in range(5):
    if touchli[i]:
      tft.rect(10 + 45 * i, 190, 40, 25, bkcolor, 0x00F0F0)
      music.duty(50)
      music.freq(notes[i])
    else:
      tft.rect(10 + 45 * i, 190, 40, 25, bkcolor, 0xF0F000)
    if (
      (not touchli[0])
      and (not touchli[1])
      and (not touchli[2])
      and (not touchli[3])
      and (not touchli[4])
    ):
      music.duty(0)
</source>
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<p style="font-size:115%">[[指间ESP开发板编程手册|返回指间ESP开发板编程手册界面]]</p>