ME305_Lab0x01.py File Reference

This code can change brightness of LED in apparent sequences upon button press. More...

Functions
def	ME305_Lab0x01.onButtonPressCallback (IRQ_src)
def	ME305_Lab0x01.SquareWave (t)
	This function calculates brightness at a given t value fluctuating in a square wave. More...
def	ME305_Lab0x01.SineWave (t)
	Function for Sine Wave Generation. More...
def	ME305_Lab0x01.SawWave (t)
	Function for Saw Tooth Wave Generation. More...

Variables
	ME305_Lab0x01.button_Pin = pyb.Pin (pyb.Pin.cpu.C13)
	ME305_Lab0x01.LED_Pin = pyb.Pin (pyb.Pin.cpu.A5)
bool	ME305_Lab0x01.buttonPressed = False
	buttonPressed set to boolean values used to observe whether button on pyboard is pressed More...
int	ME305_Lab0x01.state = 0
	state used to transition between FSM state diagram, 4 states total More...
	ME305_Lab0x01.ButtonInt
	ButtonInt connects button press with pyboard input. More...
	ME305_Lab0x01.tim2 = pyb.Timer(2, freq = 20000)
	tim2 creates variable for connecting timer from the pyboard More...
	ME305_Lab0x01.t2ch1 = tim2.channel(1, pyb.Timer.PWM, pin=LED_Pin)
	tim2 creates variable for connecting timer to the LED on the pyboard More...
	ME305_Lab0x01.startTime = time.ticks_ms()
	startTime begins clock timer More...
	ME305_Lab0x01.t = time.ticks_diff(time.ticks_ms(),startTime)
	t is the time variable used in each wave function
def	ME305_Lab0x01.brt = SquareWave(t)
	brt is the brightness calculated using the wave functions More...

Detailed Description

This code can change brightness of LED in apparent sequences upon button press.

Upon button press, LED shows different sequences: square, sine, and saw wave functions. Utilizes FSM state transition logic and integration.

Author

Logan Williamson

Brianna Roberts

Date

01/13/2022

Function Documentation

SawWave()

def ME305_Lab0x01.SawWave

(

t

)

Function for Saw Tooth Wave Generation.

Function evaluates brightness percentage at given time for LED

Parameters

t	Input value is t from clock generated in main

Returns

Returns brightness level evaluated at time t for LED to appear fluctuating in a sawtooth wave

SineWave()

def ME305_Lab0x01.SineWave

(

t

)

Function for Sine Wave Generation.

Function evaluates brightness percentage at given time for LED

Parameters

t	Input value is t from clock generated in main

Returns

Returns brightness level evaluated at time t for LED to appear fluctuating in a sine wave

SquareWave()

def ME305_Lab0x01.SquareWave

(

t

)

This function calculates brightness at a given t value fluctuating in a square wave.

Function evaluates brightness percentage at given time for LED

Parameters

t	Input value is time (t) from clock generated in main

Returns

Returns brightness level evaluated at time t for LED to appear fluctuating in a square wave

Variable Documentation

brt

def ME305_Lab0x01.brt = SquareWave(t)

brt is the brightness calculated using the wave functions

brt (brightness) changes with each state transition it's a value between 0-100 given as a percentage. Used for LED to change the pulse width percent.

ButtonInt

ME305_Lab0x01.ButtonInt

Initial value:

=  pyb.ExtInt(button_Pin, mode=pyb.ExtInt.IRQ_FALLING,
                           pull=pyb.Pin.PULL_NONE, callback=onButtonPressCallback)

ButtonInt connects button press with pyboard input.

once button is pressed, initiates the onButtonPressCallback function and turns on (sets True) the buttonPressed variable

buttonPressed

bool ME305_Lab0x01.buttonPressed = False

buttonPressed set to boolean values used to observe whether button on pyboard is pressed

buttonPressed is set to either true or false. Only set to true momentarily upon button press, once state is changed, button is immediately reset to False awaiting for next button press

startTime

ME305_Lab0x01.startTime = time.ticks_ms()

startTime begins clock timer

startTime is reset at beginning of each state transition.

state

int ME305_Lab0x01.state = 0

state used to transition between FSM state diagram, 4 states total

four states exist: 0, 1, 2, 3 states are transitioned upon button press. state 0 is the "off" or initialization state. state 1 causes LED to transition to square wave function state 2 causes LED to transition to sine wave function state 3 causes LED to transition to saw wave function

t2ch1

ME305_Lab0x01.t2ch1 = tim2.channel(1, pyb.Timer.PWM, pin=LED_Pin)

tim2 creates variable for connecting timer to the LED on the pyboard

used to then change PWP on LED

tim2

ME305_Lab0x01.tim2 = pyb.Timer(2, freq = 20000)

tim2 creates variable for connecting timer from the pyboard

used further in connecting to the LED pin