# MCA Lab Assessment 2

from machine import Pin
import time

# Set GPIO pins for 74HC595 Shift Register
dataPin = Pin(18, Pin.OUT)   # Serial Data Input (DS Pin 14)
latchPin = Pin(19, Pin.OUT)  # Storage Register Clock (STCP Pin 12)
clockPin = Pin(20, Pin.OUT)  # Shift Register Clock (SHCP Pin 11)

# Set GPIO pins for rows of dot matrix with output(high)
rowPin0 = Pin(0, Pin.OUT, value = 1)
rowPin2 = Pin(2, Pin.OUT, value = 1)

Pat1 = 0x0F    # Patterns
Pat2 = 0x6C

# Shifts 8 bit data into 74HC595 shift register.
def hc595_in(dat):    
    latchPin.low()
    for i in range(8):
        clockPin.low()
        dataPin.value((dat >> (7 - i)) & 1)  # Output data bit by bit
        clockPin.high()
        time.sleep_us(1)    # Short delay to ensure proper timing
    latchPin.high()

while True:
    hc595_in(Pat1)        # Send the 8-bit data to the columns
    rowPin0.low()         # Activate row
    time.sleep_ms(1000)   # Delay
    rowPin0.high()        # Deactivate row
    hc595_in(Pat2)       
    rowPin2.low()        
    time.sleep_ms(1000)  
    rowPin2.high()