lcdtest.py

# lcdtest.py Demo/test program for MicroPython scheduler with attached LCD display
# Author: Peter Hinch
# V1.02 6th Sep 2014 now uses pyb.micros() and yield from wait(fTim)
# Display must use the Hitachi HD44780 controller. This demo assumes a 16*2 character unit.

import pyb
from usched import Sched, wait
from lcdthread import LCD, PINLIST                          # Library supporting Hitachi LCD module

# HARDWARE
# Micropython board with LCD attached using the 4-wire data interface. See lcdthread.py for the
# default pinout. If yours is wired differently, declare a pinlist as per the details in lcdthread
# and instantiate the LCD using that list.

# THREADS:

def stop(fTim, objSch):                                     # Stop the scheduler after fTim seconds
    yield from wait(fTim)
    objSch.stop()

def lcd_thread(mylcd):
    mylcd[0] = "MicroPython"
    while True:
        mylcd[1] = "{:11d}uS".format(pyb.micros())
        yield from wait(1)

# USER TEST PROGRAM
# Runs forever unless you pass a number of seconds

def test(duration = 0):
    if duration:
        print("Test LCD display for {:3d} seconds".format(duration))
    objSched = Sched()
    lcd0 = LCD(PINLIST, objSched, cols = 16)
    objSched.add_thread(lcd_thread(lcd0))
    if duration:
        objSched.add_thread(stop(duration, objSched))
    objSched.run()

test(20)