【Beetle ESP32-C3】几个micropython的例子

dcexpert 发表于 2022-8-4 08:58

<div class='showpostmsg'>下载了micropython固件，就可以轻松开始测试。先通过几个小程序测试一下：

 

闪灯

 

<pre>
<code class="language-python">from machine import Pin
from time import sleep_ms

LED = Pin(10, Pin.OUT)
while 1:
LED(not LED())
sleep_ms(500)</code></pre>

 
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dcexpert 发表于 2022-8-4 09:00

本帖最后由 dcexpert 于 2022-8-4 11:00 编辑

呼吸灯（通过定时器改变PWM占空比）

 
 

<pre>
<code class="language-python">from machine import Pin, Timer, PWM

LED = PWM(Pin(10))

n = 0

def breathing(t):
global n
LED.duty(abs(1023- n*32))
n = (n + 1) % 64

T0 = Timer(0)
T0.init(period=20, mode=Timer.PERIODIC, callback=breathing)</code></pre>

dcexpert 发表于 2022-8-4 10:41

本帖最后由 dcexpert 于 2022-8-4 11:00 编辑

引脚电平中断（改变引脚上的电平，触发中断，下面使用IO0）

 
 

<pre>
<code class="language-python">from machine import Pin

LED = Pin(10, Pin.OUT)

def pin_irq(t):
LED(not LED())

p0 = Pin(0, Pin.IN, pull=Pin.PULL_UP)
p0.irq(trigger = Pin.IRQ_FALLING, handler=pin_irq)</code></pre>

dcexpert 发表于 2022-8-4 10:42

本帖最后由 dcexpert 于 2022-8-4 10:59 编辑

定时器

 
 

<pre>
<code class="language-python">from machine import Pin, Timer

LED = Pin(10, Pin.OUT)
tm =Timer(0)
tm.init(period=1000, mode=Timer.PERIODIC, callback=lambda t:LED(not LED()))</code></pre>

 

目前的micropython固件在esp32c3上存在bug，定时器的时间是实际时间2倍。

dcexpert 发表于 2022-8-4 10:52

本帖最后由 dcexpert 于 2022-8-4 10:59 编辑

ADC

 
 

<pre>
<code class="language-python">from machine import ADC, Pin
from time import sleep_ms

led = Pin(10, Pin.OUT)
adc = ADC(Pin(3))
cnt = 0

while 1:
print(cnt, adc.read_uv())
led(not led())
cnt+=1
sleep_ms(500)</code></pre>

dcexpert 发表于 2022-8-4 10:53

本帖最后由 dcexpert 于 2022-8-4 10:58 编辑

串口（串口可以使用任意IO，下面程序使用IO5发送，IO7接收）

 
 

<pre>
<code class="language-python">from machine import Pin, UART
from time import sleep_ms

led = Pin(10, Pin.OUT)
uart = UART(1, tx=5, rx=7)
cnt = 1

while 1:
uart.write(str(cnt))
if uart.any():
print('>', uart.read())
cnt+=1
led(not led())
sleep_ms(500)</code></pre>

dcexpert 发表于 2022-8-4 10:53

本帖最后由 dcexpert 于 2022-8-4 10:58 编辑

RTC

 
 

<pre>
<code class="language-python">from machine import RTC
from time import sleep_ms

rtc = RTC()
while 1:
print(rtc.datetime())
sleep_ms(1000)</code></pre>

dcexpert 发表于 2022-8-4 10:57

异步（多任务）

 

<pre>
<code class="language-python">import uasyncio as asyncio
from machine import Pin
import time

LED = Pin(10, Pin.OUT)

async def blink():

while True:
 LED(not LED())
 await asyncio.sleep(1)

async def show():
cnt = 1
T1 = time.ticks_us()
while True:
 T2 = time.ticks_us()
 print(cnt, time.ticks_diff(T2, T1))
 T1 = T2
 cnt += 1
 await asyncio.sleep(2)

asyncio.create_task(blink())
asyncio.create_task(show())
asyncio.Loop.run_forever()
</code></pre>

dcexpert 发表于 2022-8-4 11:29

SHT30温湿度传感器

 

为了省事，直接将SHT30传感器插到开发板。因为GND引脚顺序同，因此使用IO0做GND，此外 SDA=IO1，SCL=IO4。使用SoftI2C模式。

 

  

 

<pre>
<code class="language-python">from machine import Pin, SoftI2C

Pin(0, Pin.OUT, value=0)

from time import sleep_ms

class SHT3x():

def __init__(self, i2c, addr = 68):
 self.i2c = i2c
 self._addr = addr
 self.ver = '1.0'
 self.info = 'SHT3x I2C drive for micropython'
 self._mode = 1
 self._cmd = 0x240b
 self._delay = 6
 self._decimal = 1
 self._tb = bytearray(2)
 self._rb = bytearray(3)
 self._ht = bytearray(6)
 self._T = 0
 self._H = 0
 self.reset()

def status(self):
 self.write(0xf32d)
 self.i2c.readfrom_into(self._addr, self._rb)
 return self._rb*256 + self._rb

def clear_status(self):
 self.write(0x3041)

def write(self, cmd):
 self._tb = cmd>>8
 self._tb = cmd
 self.i2c.writeto(self._addr, self._tb)

def reset(self):
 self.write(0x30a2)

def heater(self, on=0):
 if on: self.write(0x306d)
 else:self.write(0x3066)

def config(self, mode = 0x240b, delay = 6, decimal = 1):
 t = mode >> 8
 self._mode = 1 if t == 0x24 or t == 0x2C else 0
 self._cmd = mode
 self._delay = delay
 self._decimal = decimal
 self.write(mode)

def measure(self):
 if self._mode:
 self.write(self._cmd)
 sleep_ms(self._delay)
 self.write(0xe000)
 self.i2c.readfrom_into(self._addr, self._ht)
 self._T = self._ht*256+self._ht
 self._H = self._ht*256+self._ht

def humidity(self):
 return round(100*self._H/65535, self._decimal)

def temperature(self):
 return round(175*self._T/65535 - 45, self._decimal)

def ht(self):
 return self.humidity(), self.temperature()

i2c= SoftI2C(sda=Pin(1), scl=Pin(4))
sh = SHT3x(i2c)
sleep_ms(10)

while 1:
sh.measure()
print(sh.ht())
sleep_ms(1000)</code></pre>

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【Beetle ESP32-C3】几个micropython的例子