Turtorial Examples for Nucleo-MicroPython

2020/3/9

Turtorial Examples for Nucleo-MicroPython

Nucleo-F446RE

Nucleo-F446RE pin layout

LED Blink

  import pyb

  while True:
  # LED(1) // Green LED on board
      pyb.LED(1).on()
      pyb.delay(1000)
      pyb.LED(1).off()
      pyb.delay(250)

  

Pin/GPIO

  from machine import Pin
  led = Pin('PA5', Pin.OUT_PP) # Green LED on board
  sw = Pin('PC13', Pin.IN, Pin.PULL_UP) # USER SW on board

  while True:
    led.value(0 == sw.value()) # invert

  

PWM

  from pyb import Timer
  from time import sleep
  from machine import Pin
  a0 = Pin('A0') # TIM2/CH1
  tim = Timer(2, freq=1000)
  ch = tim.channel(1, Timer.PWM, pin=a0)

  for p in range(100):
   ch.pulse_width_percent(p)
   sleep(0.01)
  for p in range(100):
   ch.pulse_width_percent(100-p)
   sleep(0.01)

  

ADC

  from machine import Pin, ADC
  from time import sleep
  # use A1 for analog input (Nucleo_F446RE)
  #a1 = ADC(Pin('A1')) # こっちでも動作する
  a1 = ADC('A1')

  while True:
    print('a1:{0:>8}'.format(a1.read_u16()))
    sleep(0.1)

  

以下のようにREPLで実行してみるとA0が使用不可なことが分かる：

  >>> from machine import Pin, ADC
  >>> a0 = ADC(Pin('A0'))
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  ValueError: Pin(A0) does not have ADC capabilities
  >>> a1 = ADC(Pin('A1'))
  >>> a2 = ADC(Pin('A2'))
  >>> a3 = ADC(Pin('A3'))
  >>> a4 = ADC(Pin('A4'))
  >>> a5 = ADC(Pin('A5'))
  >>> Pin('A1')
  Pin(Pin.cpu.A1, mode=Pin.ANALOG)
  >>> Pin('A0')
  Pin(Pin.cpu.A0, mode=Pin.IN)
  >>> 
  # Pin(Pin.cpu.A0, mode=Pin.IN) # A0 は　mode=Pin.ANALOG　になっていない。

  

SPI

TFT_SD_test_Nucleo.py

# TFT Touch Shield(with SD)
  # (does not support Touch)
  # setup display module
  import ili9341
  color565 = ili9341.color565
  from machine import Pin, SPI
  spi = SPI(miso=Pin('D12'), mosi=Pin('D11', Pin.OUT), sck=Pin('D13', Pin.OUT))
  #spi=SPI(1) # does not work? (error: EIO)
  display = ili9341.ILI9341(spi, cs=Pin('D5'), dc=Pin('D6'), rst=Pin('D10'))
  # setup SDCard module
  import machine, sdcard, os
  sd = sdcard.SDCard(spi, Pin('D4'))
  os.mount(sd, '/sd')
  # setup path
  import sys
  sys.path.append('/sd')
  sys.path.append('/sd/lib')
  # display test
  display.fill(color565(0xff, 0x11, 0x22))
  display.fill(color565(0xff, 0xff, 0xff))
  display.fill(color565(0x00, 0x00, 0x00))
  display.pixel(120, 160, color565(0xff,0,0))
  display.pixel(121, 161, color565(0,0,0xff))
  display.pixel(123, 163, color565(0,0xff,0))
  display.text('Hello World!',0,0,color=color565(0,0xff,00))
  display.text('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz{}()+*<>?_',100,200,color=color565(0,0,0xff))
  display.fill_rectangle(100,150,20, 50, color565(0xff,0,0))
  # SD Card test
  display.fill(color565(0x00, 0x00, 0xff))
  display.text(str(sys.path),0,0,color565(0xff,0xff,0xff),clear_eol=True)
  display.text(str(os.listdir('/sd')),0,0,color565(0xff,0xff,0xff),clear_eol=True)

  

I2C

Software I2C:

Nucleo_TMP102_softI2C_test.py

  # Nucleo
  import utime
  from machine import Pin, I2C
  from tmp102 import Tmp102
  i2c = I2C(sda=Pin('D14'),scl=Pin('D15'))
  sensor = Tmp102(i2c, 0x48)

  while True:
     print('Temperature: {0:.1f}'.format(sensor.temperature))
     utime.sleep(2)

  

Hardware I2C:
Nucleo_TMP102_test.py

  # Nucleo
  import utime
  from machine import Pin, I2C
  from tmp102 import Tmp102
  i2c = I2C(1)
  sensor = Tmp102(i2c, 0x48)

  while True:
     print('Temperature: {0:.1f}'.format(sensor.temperature))
     utime.sleep(2)

  

RTC

from machine import RTC

  rtc = RTC()
  rtc.datetime((2020, 3, 9, 1, 8, 53, 0, 0)) # set a specific date and time
  # The 8-tuple has the following format:
  # (year, month, day, weekday, hours, minutes, seconds, subseconds)
  # weekday is 1-7 for Monday through Sunday.
  # subseconds counts down from 255 to 0

  rtc.datetime() # get date and time

  

NeoPixel

module install:

  git clone https://github.com/JanBednarik/micropython-ws2812.git
  cd micropython-ws2812
  ampy put ws2812.py
  

sample1:

  # connect the following pin to DIN of nexpixels
  # D11 (if spi_bus=1) or D4 (if spi_bus=3)
  from ws2812 import WS2812
  chain = WS2812(spi_bus=3, led_count=4)
  data = [
      (255, 0, 0),    # red
      (0, 255, 0),    # greenp
      (0, 0, 255),    # blue
      (85, 85, 85),   # white
  ]
  chain.show(data)

  

sample2:

  from time import sleep
  import math
  from ws2812 import WS2812

  ring = WS2812(spi_bus=3, led_count=16, intensity=0.1)

  def data_generator(led_count):
      data = [(0, 0, 0) for i in range(led_count)]
      step = 0
      while True:
          red = int((1 + math.sin(step * 0.1324)) * 127)
          green = int((1 + math.sin(step * 0.1654)) * 127)
          blue = int((1 + math.sin(step * 0.1)) * 127)
          data[step % led_count] = (red, green, blue)
          yield data
          step += 1

  for data in data_generator(ring.led_count):
      ring.show(data)
      sleep(0.01)

  

DHT

STM32_demo_DHT11.py

  # F446RE
  from dht import DHT11
  from machine import Pin
  from time import sleep

  d = DHT11(Pin('D5'))
  while True:
     d.measure()
     tempe=d.temperature()
     humi=d.humidity()
     print('tempe: {0:.1f} humi:{1:0.1f}'.format(tempe, humi))
     sleep(1)

  

Networking

N.A.

Performance Test

performanceTest.py

  # Peformace Test
  def performanceTest():
      millis = pyb.millis
      endTime = millis() + 10000
      count = 0
      while millis() < endTime:
          count += 1
      print("Count: ", count)

  performanceTest()

  

以上