MicroPython

@woakas CTO at Ubidots

WHAT???

3, 2, 1, Ready!

Each module is either written from scratch or ported from CPython.

The board

  • Based on the STM32F405 microcontroller(32 bit ARM Cortex M4)
  • CPU 168MHz
  • 1MiB flash
  • 192KiB RAM
 

Differences to CPython

  • MicroPython does not implement complete CPython
  • MicroPython implements only subset of functionality and parameters of particular functions and classes.
  • print() function does not check for recursive data structures in the same way CPython does.

https://github.com/micropython/micropython/wiki/Differences

Libraries

  • asyncio
  • calendar
  • datetime
  • functools
  • gzip
  • ....
  • ....

https://github.com/micropython/micropython-lib

Examples

import pycom
import time
pycom.heartbeat(False)
for cycles in range(10): # stop after 10 cycles
    pycom.rgbled(0x007f00) # green
    time.sleep(5)
    pycom.rgbled(0x7f7f00) # yellow
    time.sleep(1.5)
    pycom.rgbled(0x7f0000) # red
    time.sleep(4)

REPL (Read-Eval-Print-Loop)

Led on / off

import pycom
import time
pycom.heartbeat(False)
for cycles in range(10): # stop after 10 cycles
    pycom.rgbled(0x007f00) # green
    time.sleep(5)
    pycom.rgbled(0x7f7f00) # yellow
    time.sleep(1.5)
    pycom.rgbled(0x7f0000) # red
    time.sleep(4)

On/OFF

import machine
led=machine.Pin("G16",machine.Pin.OUT)
led.value(1)
led.value(0)

Button

import machine
led = machine.Pin("G16", machine.Pin.OUT)

button = machine.Pin("G17", machine.Pin.IN, pull=machine.Pin.PULL_UP)

def handler(button):
    led.toggle()

button.callback(trigger=machine.Pin.IRQ_FALLING, handler=handler)


import machine
button = machine.Pin("G17", machine.Pin.IN, pull=machine.Pin.PULL_UP)
button()

eval

import time
import machine

led = machine.Pin("G16", machine.Pin.OUT)

eval("led.value(0)")

Save program


a = """import time
from machine import Pin
led = Pin('G10', mode=Pin.OUT, value=0)
for i in range(10):
led.toggle()
time.sleep(0.1)
"""

with open('/flash/main.py', 'w') as f:
    f.write(a)

Threads

import _thread
import time

def th_func(delay, id):
    while True:
        time.sleep(delay)
        print('Running thread %d' % id)

for i in range(3):
    _thread.start_new_thread(th_func, (i + 1, i))

WEEEE

Ahora con IoT

Sigfox - LoRaWan

Sigfox

from network import Sigfox
import socket
import struct

# init Sigfox for RCZ1 (Europe)
sigfox = Sigfox(mode=Sigfox.SIGFOX, rcz=Sigfox.RCZ2)

# create a Sigfox socket
s = socket.socket(socket.AF_SIGFOX, socket.SOCK_RAW)

# make the socket blocking
s.setblocking(True)

# configure it as DOWNLINK specified by 'True'
s.setsockopt(socket.SOL_SIGFOX, socket.SO_RX, True)

# send values as little-endian and int, request DOWNLINK
s.send(struct.pack("<f",  23.2))

References

Python en microcontroladores

By Gustavo Angulo

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Python en microcontroladores

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