View source for 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 <code>pip install esptool</code>

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


== REPL over serial port ==
REPL(Read Evaluate Print Loop) AKA the interactive MicroPython prompt. 


* <code> stty < /dev/ttyUSB0 </code>
<pre>
speed 115200 baud; line = 0;
min = 100; time = 2;
-icrnl -imaxbel
-opost -onlcr
-isig -icanon -echo
</pre>

* connect to REPL <code>screen /dev/ttyUSB0 115200 </code>
* Ctl-A will exit screen

== Load files and run code on a uPython ==
Tools available: 
* Adafruit [https://github.com/pycampers/ampy ampy] python module
* [https://github.com/dhylands/rshell rshell] remote Shell for MicroPython
* [https://github.com/wendlers/mpfshell mpfshell] remote Shell specially for ESP8266-based boards and the WiPy board

===Using ampy===
In the ESP8266 file system there are the files:
* <code>boot.py</code> is executed first (if it exists) 
* <code>main.py</code> is executed once boot.py is finished executing

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

<source lang="python">
from time import sleep
from machine import Pin
p2 = Pin(2, Pin.OUT)
while True:
    p2.value(not p2.value())
    sleep(0.5)
</source>

create a syslink between blink_led.py and main.py <code>ln blink_led.py main.py</code>

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

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


[[Section::Code Notes]]
[[Date::2019]]