remove other scripts
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71
monitor.py
71
monitor.py
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import RPi.GPIO as GPIO
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from RPi.GPIO import IN
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# Monitor the 6502 processor
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gpio_l = [2, 3, 4, 17, 27, 22, 10, 9, 11, 5, 6, 13, 19, 26]
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gpio_r = [14, 15, 18, 23, 24, 25, 8, 7, 12, 16, 20, 21]
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#
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# Defining which 6502 pin goes to which GPIO pin
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#
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A = gpio_l[0:12]
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A.reverse() # first 11 address pins, left side of 6502
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A += [23, 18, 15, 14] # last 4 address pins
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D = gpio_r[-8:] # 8 io pins
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D.reverse()
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PHI2 = 26
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RWB = 19
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GPIO.setmode(GPIO.BCM)
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# OUT when writing and IN when reading
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for pin in [PHI2, RWB]:
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GPIO.setup(pin, IN)
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for pin in A:
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GPIO.setup(pin, IN)
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for pin in D:
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GPIO.setup(pin, IN)
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def print_pins():
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for i in range(len(A)):
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print(f"A{i} - {A[i]}")
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for i in range(len(D)):
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print(f"D{i} - {D[i]}")
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print(f"PHI2 - {PHI2}")
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print(f"RWB - {RWB}")
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def start_monitor():
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run = True
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while run:
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# wait for a rising clock edge before outputting
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channel = GPIO.wait_for_edge(PHI2, GPIO.FALLING, timeout=1000) # at least every 1 seconds
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if channel is None:
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continue
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address = ""
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data = ""
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for i in range(len(A)):
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address += str(GPIO.input(A[len(A)-1-i]))
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for i in range(len(D)):
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data += str(GPIO.input(D[len(D)-1-i]))
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if GPIO.input(RWB):
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rwb = "r"
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else:
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rwb = "w"
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line = f"0b{address} - 0b{data}|||0x{format(int(address, 2), '04x')} - 0x{format(int(data, 2), '02x')}|||{rwb} "
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print(line)
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print_pins()
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try:
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start_monitor()
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except KeyboardInterrupt:
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GPIO.cleanup()
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23
opcodes.py
23
opcodes.py
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opcodes_d = {
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# branches
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0xf0: "beq r",
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0xd0: "bne r",
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# jump
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0x4c: "jmp a",
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0x20: "jsr s",
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0x60: "rts s",
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# load
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0xad: "lda a",
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0xa9: "lda #",
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0xa2: "ldx #",
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# store
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0x8d: "sta a",
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# compare
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0xc9: "cmp #",
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# increments
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0xee: "inc a",
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0x1a: "inc A",
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0xe8: "inx i",
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}
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