2021A/main.py

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.lang import Builder
import asyncio
from bleak import BleakClient,BleakScanner

import json

STM32_UUID = "00001101-0000-1000-8000-00805F9B34FB"

class InfoWidget(Widget): 
    def __init__(self, **kwargs):
        super(InfoWidget, self).__init__(**kwargs)
        self.size = (800,480)
        asyncio.run(self.discover_devices())

    async def discover_devices(self):
        devices = await BleakScanner.discover()
        grid00 = GridLayout(cols=1,rows=2,width=self.width,height=self.height / 4)
        grid00.top = self.top
        self.add_widget(grid00)
        grid01 = GridLayout(cols=2,rows=1,width=grid00.width,height=grid00.height / 2)
        grid00.add_widget(grid01)
        grid01.add_widget(Label(text="Device Name:",width=grid00.width / 2,height=grid00.height / 2,font_size=50))
        deviceName = "HC-06"
        grid01.add_widget(TextInput(text=deviceName,width=grid00.width / 2,height=grid00.height / 2,font_size=40))
        connect_button = Button(text="Connect",width=grid00.width,height=grid00.height / 2,center_x=grid00.center_x,font_size=40)
        Builder.load_string('''
<Button>:
    id: connect_button
    on_touch_down: root.root.remove_widget(grid00)
                            ''')
        grid00.add_widget(connect_button)

        for d in devices:
            if d.name == deviceName:
                await self.connect_and_receive(d.address)
                self.add_widget(Label(text="Connected",width=self.width,height=self.height / 4))
                break
        # grid1 = GridLayout(cols=2,rows=5,width=self.width,height=self.height)
        # self.add_widget(grid1)
        # for num,d in enumerate(devices):
        #     button = Button(text=f"{d.name}")
        #     button.height = grid1.height / 5
        #     button.width = grid1.width / 2
        #     button.on_touch_down = lambda instance, d=d: asyncio.run(self.connect_and_receive(d.address))
        #     grid1.add_widget(button)
        #     if num >= 9:
        #         break

    async def connect_and_receive(self, address):
        async with BleakClient(address) as client:
            if await client.is_connected():
                rawdata = await client.read_gatt_char(STM32_UUID)
                data = rawdata.decode("utf-8")
                if data.startswith("[") and data.endswith("]"):
                    list = json.loads(data)
                    info = "基波频率：" + str(list[0]) + "Hz\n" + \
                                "THD：" + str(list[6]) + "%\n" + \
                                "基波幅值：" + str(list[1]) + "V\n" + \
                                "二次谐波：" + str(list[2]) + "V\n" + \
                                "三次谐波：" + str(list[3]) + "V\n" + \
                                "四次谐波：" + str(list[4]) + "V\n" + \
                                "五次谐波：" + str(list[5]) + "V\n"
                else:
                    info = "传输数据出错"
                label = Label(text=info)
                self.add_widget(label)
                return 
            else:
                print("Failed to connect to device.")
    def debug(self):
        # self.size = (800,480)
        grid = GridLayout(cols=2,rows=4,width=self.width,height=self.height)
        self.add_widget(grid)
        for i in range(8):
            button = Button(text=str(i))
            button.width = grid.width / 2
            button.height = grid.height / 4
            grid.add_widget(button)

class STI2021A(App):
    def build(self):
        info = InfoWidget()
        # info.debug()
        return info


if __name__ == '__main__':
    STI2021A().run()