【得捷电子Follow me第1期】任务3：同步网络时间

你家吃的

【得捷电子Follow me第1期】任务3：同步网络时间 [复制链接]

本帖最后由你家吃的于 2023-5-1 14:29 编辑

主题：

学习network模块用法，掌握连接网络、查看网络参数等用法，实现通过网络同步系统时间。

搭配器件：Raspberry Pi Pico w开发板

每日最新的UF2固件文件：https://micropython.org/download/rp2-pico-w/

raspberry pi pico w板子上搭了个无线芯片CYW43439，通过spi接口与板子相接。这颗芯片支持802.11a/b/g/n，蓝牙 v5.2 + EDR。板子还不支持蓝牙1。下图可以看到引脚接线图来看，这个板子是没法支持了，硬件上蓝牙的线没拉上。

------------------------连接网络、查看网络参数

import network
import time

wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('---', '---')
while not wlan.isconnected() and wlan.status() >= 0:
    print("Waiting to connect:")
time.sleep(1)
print(wlan.ifconfig())

效果如下

------------------------实现一个简单的网络获取时间代码

import machine
import time
import ssd1306
import math
import ufont
import socket
import ujson
import network


led = machine.Pin("LED",machine.Pin.OUT)
i2c1 = machine.I2C(0, sda=machine.Pin("GP8"), scl=machine.Pin("GP9"), freq=400000)
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('---','---')
print(wlan.ifconfig())
import urequests
r = urequests.get("https://api.seniverse.com/v3/weather/daily.json?key=SorklM7u-uR7sB3UR&location=dalian&language=zh-Hans&unit=c&start=-1&days=5")
e=r.text.encode('utf-8').decode("unicode_escape")
print(e)

parsed = ujson.loads(e)

res = parsed['results']
print(type(parsed))
print(type(res))
print("11111111 %s" % type(res[0]))

#内层
print(res[0]['location']['name'])
print(res[0]['daily'][0]['date'])
print(res[0]['daily'][0]['text_night'])

posi = res[0]['location']['name']
date = res[0]['daily'][0]['date']
ss = res[0]['daily'][0]['text_night']

display = ssd1306.SSD1306_I2C(128,64,i2c1)

font = ufont.BMFont("unifont-14-12917-16.v3.bmf")
font.text(display, "天气:", 0, 0, show=True)
font.text(display, "日期:", 0, 20, show=True)
font.text(display, "时间:", 0, 40, show=True)

showCl = '{0}.{1}'.format(posi,ss)
font.text(display, showCl, 40, 0, show=True)
font.text(display, date,40, 20, show=True)
#font.text(display,, 40, 40, show=True)

r.close()
#获取时间

while True:
    
    r = urequests.get('http://quan.suning.com/getSysTime.do')
    parsed = ujson.loads(r.text)
    tm = (parsed['sysTime2']).split()[1]
    
    display.rect(40,40,120,40,0,True)
    font.text(display,tm, 40, 40, show=True)
    time.sleep(.3)
    led.on()
    time.sleep(.3)
    led.off()

通过知心天气接口得到天气的信息，返回的json数据如下，使用ujson模块解析这个数据结构：

{
    "results":[
        {
            "location":{
                "id":"WWYMRT0VRMUG",
                "name":"大连",
                "country":"CN",
                "path":"大连,大连,辽宁,中国",
                "timezone":"Asia/Shanghai",
                "timezone_offset":"+08:00"
            },
            "daily":[
                {
                    "date":"2023-05-01",
                    "text_day":"晴",
                    "code_day":"0",
                    "text_night":"多云",
                    "code_night":"4",
                    "high":"20",
                    "low":"10",
                    "rainfall":"0.00",
                    "precip":"0.00",
                    "wind_direction":"南",
                    "wind_direction_degree":"180",
                    "wind_speed":"32.8",
                    "wind_scale":"5",
                    "humidity":"65"
                },
                {
                    "date":"2023-05-02",
                    "text_day":"多云",
                    "code_day":"4",
                    "text_night":"晴",
                    "code_night":"1",
                    "high":"21",
                    "low":"12",
                    "rainfall":"0.00",
                    "precip":"0.00",
                    "wind_direction":"南",
                    "wind_direction_degree":"180",
                    "wind_speed":"43.3",
                    "wind_scale":"6",
                    "humidity":"65"
                },
                {
                    "date":"2023-05-03",
                    "text_day":"晴",
                    "code_day":"0",
                    "text_night":"多云",
                    "code_night":"4",
                    "high":"18",
                    "low":"12",
                    "rainfall":"0.00",
                    "precip":"0.00",
                    "wind_direction":"东南",
                    "wind_direction_degree":"135",
                    "wind_speed":"32.8",
                    "wind_scale":"5",
                    "humidity":"91"
                }
            ],
            "last_update":"2023-05-01T08:00:00+08:00"
        }
    ]
}

通过http://quan.suning.com/getSysTime.do获取到时间

效果：

322_1682922096

语法小讲堂：

ord() ：返回一个字符的unicode码
chr() ：传入编码，返回一个字符
print ： print(' %s' % 'helloworld') print('{0} {1}' .format('hello','world'))
ss.encode('utf-8').decode("unicode_escape") 把一个unicode编码转换为utf-8编码

三元表达式 exp1 if condition else exp2 ：如果condition成立，执行exp1，否则执行exp2
super().__init__() ：此方法是用来调用父类的初始化函数
父类调用子类的方法

ssd1306.SSD1306_I2C(oled_width, oled_height, i2c) //实例化

SSD1306类里调用 SSD1306_I2C的write_cmd了等方法，百度一下，没啥结果。个人理解，是SSD1306_I2C类实例化，同时实例化父类SSD1306，再实例化FrameBuffer。结果就是实例化了三个类。最主要的是python语言的逻辑相信程序员，在父类调用子类方法的时候，子类一定定义了此方法，所以脚本解释的时候能够调用到。其实自始至终代码里只有一个实例。如果理解错误，当我乱讲，不过能够帮助理解这个语法。

# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
# https://github.com/micropython/micropython/blob/master/drivers/display/ssd1306.py
from micropython import const
import framebuf

# register definitions
SET_CONTRAST = const(0x81)
SET_ENTIRE_ON = const(0xA4)
SET_NORM_INV = const(0xA6)
SET_DISP = const(0xAE)
SET_MEM_ADDR = const(0x20)
SET_COL_ADDR = const(0x21)
SET_PAGE_ADDR = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP = const(0xA0)
SET_MUX_RATIO = const(0xA8)
SET_IREF_SELECT = const(0xAD)
SET_COM_OUT_DIR = const(0xC0)
SET_DISP_OFFSET = const(0xD3)
SET_COM_PIN_CFG = const(0xDA)
SET_DISP_CLK_DIV = const(0xD5)
SET_PRECHARGE = const(0xD9)
SET_VCOM_DESEL = const(0xDB)
SET_CHARGE_PUMP = const(0x8D)


# Subclassing FrameBuffer provides support for graphics primitives
# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
class SSD1306(framebuf.FrameBuffer):
    def __init__(self, width, height, external_vcc):
        self.width = width
        self.height = height
        self.external_vcc = external_vcc
        self.pages = self.height // 8
        self.buffer = bytearray(self.pages * self.width)
        super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
        self.init_display()

    def init_display(self):
        for cmd in (
                SET_DISP,  # display off
                # address setting
                SET_MEM_ADDR,
                0x00,  # horizontal
                # resolution and layout
                SET_DISP_START_LINE,  # start at line 0
                SET_SEG_REMAP | 0x01,  # column addr 127 mapped to SEG0
                SET_MUX_RATIO,
                self.height - 1,
                SET_COM_OUT_DIR | 0x08,  # scan from COM[N] to COM0
                SET_DISP_OFFSET,
                0x00,
                SET_COM_PIN_CFG,
                0x02 if self.width > 2 * self.height else 0x12,
                # timing and driving scheme
                SET_DISP_CLK_DIV,
                0x80,
                SET_PRECHARGE,
                0x22 if self.external_vcc else 0xF1,
                SET_VCOM_DESEL,
                0x30,  # 0.83*Vcc
                # display
                SET_CONTRAST,
                0xFF,  # maximum
                SET_ENTIRE_ON,  # output follows RAM contents
                SET_NORM_INV,  # not inverted
                SET_IREF_SELECT,
                0x30,  # enable internal IREF during display on
                # charge pump
                SET_CHARGE_PUMP,
                0x10 if self.external_vcc else 0x14,
                SET_DISP | 0x01,  # display on
        ):  # on
            self.write_cmd(cmd)
        self.fill(0)
        self.show()

    def poweroff(self):
        self.write_cmd(SET_DISP)

    def poweron(self):
        self.write_cmd(SET_DISP | 0x01)

    def contrast(self, contrast):
        self.write_cmd(SET_CONTRAST)
        self.write_cmd(contrast)

    def invert(self, invert):
        self.write_cmd(SET_NORM_INV | (invert & 1))

    def rotate(self, rotate):
        self.write_cmd(SET_COM_OUT_DIR | ((rotate & 1) << 3))
        self.write_cmd(SET_SEG_REMAP | (rotate & 1))

    def show(self):
        x0 = 0
        x1 = self.width - 1
        if self.width != 128:
            # narrow displays use centred columns
            col_offset = (128 - self.width) // 2
            x0 += col_offset
            x1 += col_offset
        self.write_cmd(SET_COL_ADDR)
        self.write_cmd(x0)
        self.write_cmd(x1)
        self.write_cmd(SET_PAGE_ADDR)
        self.write_cmd(0)
        self.write_cmd(self.pages - 1)
        self.write_data(self.buffer)

    def clear(self):
        self.fill(0)


class SSD1306_I2C(SSD1306):
    def __init__(self, width, height, i2c, addr=0x3C, external_vcc=False):
        self.i2c = i2c
        self.addr = addr
        self.temp = bytearray(2)
        self.write_list = [b"\x40", None]  # Co=0, D/C#=1
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.temp[0] = 0x80  # Co=1, D/C#=0
        self.temp[1] = cmd
        self.i2c.writeto(self.addr, self.temp)

    def write_data(self, buf):
        self.write_list[1] = buf
        self.i2c.writevto(self.addr, self.write_list)


class SSD1306_SPI(SSD1306):
    def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
        self.rate = 10 * 1024 * 1024
        dc.init(dc.OUT, value=0)
        res.init(res.OUT, value=0)
        cs.init(cs.OUT, value=1)
        self.spi = spi
        self.dc = dc
        self.res = res
        self.cs = cs
        import time

        self.res(1)
        time.sleep_ms(1)
        self.res(0)
        time.sleep_ms(10)
        self.res(1)
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs(1)
        self.dc(0)
        self.cs(0)
        self.spi.write(bytearray([cmd]))
        self.cs(1)

    def write_data(self, buf):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(buf)
        self.cs(1)

补充内容 (2023-5-1 14:32): 测试 补充内容 (2023-5-1 14:46): 唉，为啥发了帖子，就不允许修改呢