# Project#7 - Time to Play some Audio with the help of SPI and our audio player!
# We need to set up our SPI commication lines for this project, as that is how we instruct our audio player to play sound bites
# Please refer to the little buddy talker library on the project page for lookup values
# Connections:  Add jumpers to the LED headers (Labelled G16BLU and G17RED) to the left of the coin battery.
# Also add jumpers to the GP15 S1 header and GP14 S2 headers to the right of the coin battery socket.
# The DIP swtiche channels are tied to GPIOs 18-thrrough 21
# Add a jumper to the BUZ/G22 header to connect GP22 to the buzzer control circuit.
# Add a jumper to the MIC/AD1 header to connect the AD1/GP27 pin to the microphone output
# Add a jumper to the header just behind the light sensor (Right between the microphone and the light sensor)
# Make sure that you have a stereo cable connected between the AUDIO output jack and the STEREO INPUT line if your powered speakers
# NO CONNETIONS NEED TO BE MADE FOR THE AUDIO PLAYER.  THEY ARE DEDICATED TO GPIOs2,3,4,5 AND 6. THESE GPIOS CAN'T BE USED FOR OTHER ITEMS!

import machine   # Think of "import" as importing a library.  This library allows for us to use GPIOs
import utime     # This "library" allows for us to tell time if connected to the internet, and use delays like 'utime.sleep(1)'
#The below declarations are new since project#6
ASTOP = machine.Pin(6, machine.Pin.IN)  #Setup the ASTOP (AUDIO STOP) pint o GPIO 6.  Set it as an input.
cs = machine.Pin(5, machine.Pin.OUT)    #Setup the CS (Chip select pin for the audio chip. GPIO5.  Set as output.
cs.value(1)    # Set the CS line to 1 (HIGH/3.3v)
spi_sck=machine.Pin(2) # Set SPI clock to GPIO pin 2
spi_tx=machine.Pin(3)  # Set SPI MASTER OUT to GPIO pin 3
spi_rx=machine.Pin(4)  # Set SPI MASTER IN to GPIO pin 4
spi=machine.SPI(0,baudrate=500000,sck=spi_sck,mosi=spi_tx, phase=1, polarity=0) # Setup SPI communications settings
utime.sleep(1)      # Sleep/Wait for one second
hold = '\x00'       # 'hold' acts as the pointer for the little buddy talker chip.  Load the HEX value of the audio bite that you want to play, then call the playaudio() function.
#
LightSensor = machine.ADC(26)  # Setup GPIO26 to act as the ADC input for the light sensor.
Buzzer = machine.Pin(22, machine.Pin.OUT)    #Setup the Buzzer, which is connected to GPIO 22. Declare it as an output.
Microphone = machine.ADC(27) # Setup GPIO27 to act as the ADC input for the microphone.  This is the AD1 line
Button = machine.Pin(15, machine.Pin.IN)  #Setup the SEL1 button pin to GPIO 15.  Set it as an input and name it "Button"
Button2 = machine.Pin(14, machine.Pin.IN)  #Setup the SEL2 button pin to GPIO 14.  Set it as an input and name it "Button2"
DIPA = machine.Pin(21, machine.Pin.IN)  #Setup DIP Switch Channel-A as an output
DIPB = machine.Pin(20, machine.Pin.IN)  #Setup DIP Switch Channel-B as an output
DIPC = machine.Pin(19, machine.Pin.IN)  #Setup DIP Switch Channel-C as an output
DIPD = machine.Pin(18, machine.Pin.IN)  #Setup DIP Switch Channel-D as an output
LEDRED = machine.Pin(16, machine.Pin.OUT)   # Set up GPIO16 as an output, and name it LEDRED
LEDBLU = machine.Pin(17, machine.Pin.OUT)   # Do the same for GPIO17
LEDRED.value(0)   # Turn the red LED off.  If you set it to (1), then you'd be turning it on
LEDBLU.value(0)   # Turn the blue LED off.  If you set it to (1), then you'd be turning it on
state = 0  # state is a variable/storage register.  Set it to a value of 0.
hold = 0   # hold is another variable that we'll use to store data in
conversion = 3.3/(65535) # Conversion helps us to turn ADC readings (Numeral values) into a voltage representation.
# 3.3v is the full scale voltage.  0-65565 is the full 16-bit scale value used for ADC conversions.  0000000000000000-1111111111111111

def playaudio():
    print("Playing sound bite...")  # Print this to the shell
    global hold         # global means that this valiable can be used across functions.
    cs.value(0)         # Clear the cs pin to 0v to activate the audio chip
    utime.sleep(0.001)  # Wait 1ms
    spi.write('\x98')   # '\x98' is the first value that is always sent to the audio chip
    spi.write(hold)     # The HEX value stored in 'hold' will be sent to the audio chip, which will instruct it to play the sound bite in question
    utime.sleep(0.001)  # Wait another 1ms
    cs.value(1)         # Set the cs pin to 5v to end the transaction
    utime.sleep(0.01)    # Wait 10ms
    while ASTOP.value() == True:  #Turn on the red LED for as long as the ASTOP chip signal is high (true).  Once this line goes low, the audio bite is done playing.
        LEDRED.value(1) # Turn on the red LED
    LEDRED.value(0)     # When the while loop ends, the audio bite has completed, and the LED turns off.
    print("Done...")    # Print this to the shell
    # This is the end of this function

# This is the main code loop.  If is very simple.  Play the first three audio bites on the little buddy talker over and over...
while True:  # Do the following forever...
    hold = '\x00'  # /x00 equals 0 in HEX format
    playaudio()    # Call the playaudio function to play the audio bite.
    utime.sleep(1) # Wait one full second
    hold = '\x01'  # /x01 equals 1 in HEX format
    playaudio()    # Call the playaudio function to play the audio bite.
    utime.sleep(1) # Wait one full second
    hold = '\x02'  # /x02 equals 2 in HEX format
    playaudio()    # Call the playaudio function to play the audio bite.
    utime.sleep(1) # Wait one full second
    print("Let's do it again!") # Print this to the shell and start over
    # This is the end of the main loop.  It will look over and over and over forever.