lab2.py File Reference

A program that implements a state machine for changing the flashing pattern of an LED. More...

Functions
def	lab2.onButtonPressFCN (IRQ_src)
	A function that sets buttonPress to True when the blue button is pressed.
def	lab2.squareWave (tick)
	A function that generates a square wave that oscillates between 0 and 100. More...
def	lab2.sineWave (tick)
	A function that generates a sine wave that oscillates between 0 and 100. More...
def	lab2.sawtoothWave (tick)
	A function that generates a sawtooth wave that oscillates between 0 and 100. More...
def	lab2.transitionStates (trans, st)
	A function that preforms all repetative tasks durring a state change. More...

Variables
int	lab2.state = 0
	The current state of the elevator finite state machine.
	lab2.lastTransition = utime.ticks_ms()
bool	lab2.buttonPress = False
	Wether or not the button is pressed (True = pressed).
	lab2.pinC13 = pyb.Pin(pyb.Pin.cpu.C13)
	lab2.ButtonInt = pyb.ExtInt(pinC13, mode=pyb.ExtInt.IRQ_FALLING, pull=pyb.Pin.PULL_NONE, callback=onButtonPressFCN)
	lab2.pinA5 = pyb.Pin (pyb.Pin.cpu.A5)
	lab2.tim2 = pyb.Timer(2, freq = 20000)
	lab2.t2ch1 = tim2.channel(1, pyb.Timer.PWM, pin=pinA5)
dictionary	lab2.stateMessages
int	lab2.dutyCycle = 0

Detailed Description

A program that implements a state machine for changing the flashing pattern of an LED.

Link to Source Code: https://bitbucket.org/ebriefer/me305_lab/src/master/Lab%202/lab2.py Demonstration https://youtu.be/98HGiMh8p0U This program cycles through three different flashing patterns for and LED on the nucleo board. Specifically, the three patterns are a square wave, a sine wave, and sawtooth wave. The LED pattern changes every time the user presses the blue button on the nucleo. State machine diagram:

Author

Eliot Briefer

Date

2/4/2020

Function Documentation

sawtoothWave()

def lab2.sawtoothWave

(

tick

)

A function that generates a sawtooth wave that oscillates between 0 and 100.

Parameters

tick	The current clock tick in milliseconds.

Returns

The value of the sawtooth wave at the given tick.

sineWave()

def lab2.sineWave

(

tick

)

A function that generates a sine wave that oscillates between 0 and 100.

Parameters

tick	The current clock tick in milliseconds.

Returns

The value of the sine wave at the given tick.

squareWave()

def lab2.squareWave

(

tick

)

A function that generates a square wave that oscillates between 0 and 100.

Parameters

tick	The current clock tick in milliseconds.

Returns

The value of the square wave at the given tick.

transitionStates()

def lab2.transitionStates	(		trans,
			st
	)

A function that preforms all repetative tasks durring a state change.

Parameters

trans	A boolean representing wether to transition or not (True = transition now).
st	The state to transition to.

Variable Documentation

stateMessages

dictionary lab2.stateMessages

Initial value:

=  {
        0 : "Square wave pattern selected",
        1 : "Sine wave pattern selected",
        2 : "Sawtooth wave pattern selected"
        }