Micropython 01 start

Board: ESP8266

• [uPython esp8266/quickref http://docs.micropython.org/en/latest/esp8266/quickref.html]

Flash uPython

• uPython firmware: http://micropython.org/download#esp8266 download latest stable
• install esptool.py to flash the board pip install esptool

Flash squence:

• connect board to usb
• erase the flash esptool.py --port /dev/ttyUSB0 erase_flash
• write firmware <code?esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0

REPL over serial port

REPL(Read Evaluate Print Loop) AKA the interactive MicroPython prompt.

• stty < /dev/ttyUSB0

speed 115200 baud; line = 0;
min = 100; time = 2;
-icrnl -imaxbel
-opost -onlcr
-isig -icanon -echo

• connect to REPL screen /dev/ttyUSB0 115200
• Ctl-A will exit screen

Load files and run code on a uPython

Tools available:

• Adafruit ampy python module
• rshell remote Shell for MicroPython
• mpfshell remote Shell specially for ESP8266-based boards and the WiPy board

Using ampy

In the ESP8266 file system there are the files:

• boot.py is executed first (if it exists)
• main.py is executed once boot.py is finished executing

So What will do is save the following script as <codeblink_led.py

from time import sleep
from machine import Pin
p2 = Pin(2, Pin.OUT)
while True:
    p2.value(not p2.value())
    sleep(0.5)

create a syslink between blink_led.py and main.py ln blink_led.py main.py

Use ampy to put the script (main.py) on the board ampy --port /dev/ttyUSB0 put main.py

Reset: either by pressing the reset button, or disconnecting and connecting to power, for the new main.py to be compiled.

Code Notes 2019