Nucleo's LED transitions between 3 pulse wave cycles. More...

Functions
def	nucleo_LED.myCallback (IRQ_source)
	interrupt callback called when blue user button is pushed More...

Variables
int	nucleo_LED.myVar = 0
	setting global variable equal to 0

int	nucleo_LED.start = 0
	set start time to zero

	nucleo_LED.pinA5 = pyb.Pin (pyb.Pin.cpu.A5)
	Connecting to pinA5 to control LD2 LED.

	nucleo_LED.tim2 = pyb.Timer(2, freq = 20000)
	create object using timer 2, trigger at 20000 hz (cycle/sec)

	nucleo_LED.t2ch1 = tim2.channel(1, pyb.Timer.PWM, pin=pinA5)
	Set up timer channel for LD2 LED.

	nucleo_LED.pinC13 = pyb.Pin (pyb.Pin.cpu.C13)
	Define pin object for PC13 - for blue user button.

	nucleo_LED.ButtonInt = pyb.ExtInt(pinC13, mode=pyb.ExtInt.IRQ_FALLING,pull=pyb.Pin.PULL_NONE, callback=myCallback)
	Associate the callback function with the pin by setting up an external interrupt.

int	nucleo_LED.state = 0
	Setting state to initial state.

	nucleo_LED.start1 = utime.ticks_ms()
	start recording time for state 1

tuple	nucleo_LED.duration = (utime.ticks_diff(start1,start)/1000)
	find difference of time (ms->sec) between button click and state start

int	nucleo_LED.duty = 100*(duration%1)
	percentage of LED brightness

	nucleo_LED.start2 = utime.ticks_ms()
	start recording time for state 2

	nucleo_LED.start3 = utime.ticks_ms()
	start recording time for state 3

	nucleo_LED.mode

	nucleo_LED.IRQ_FALLING

	nucleo_LED.pull

	nucleo_LED.PULL_NONE

	nucleo_LED.callback

Detailed Description

Nucleo's LED transitions between 3 pulse wave cycles.

Implements a finite state machine, shown below, to simulate the behavior of a Nucleo's LED (LD2) transtioning between three pulse cycles (Square,Sine,Saw-Tooth) by clicking on the blue user button on the Nucleo. The link to the code can be found here: https://bitbucket.org/mzaman01/me305_labs/src/master/Lab%202/nucleo_LED.py The link to the video can be found here: https://www.youtube.com/watch?v=sSyAD_bxfh0

Nucleo LED Finite State Transition Diagram

Function Documentation

def nucleo_LED.myCallback ( IRQ_source )

interrupt callback called when blue user button is pushed

Parameters

IRQ_src the interrupt request state