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Fix bugs, play with flag behaviour, write some new test programs

This commit is contained in:
n loewen 2025-03-29 08:35:27 +00:00
parent 4c605e92c5
commit 98b19ce936
1 changed files with 26 additions and 16 deletions
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42
src/pi-pico/cpu-pi-pico.py
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@ -53,8 +53,6 @@ class CPU:
def load_memory(self, bytes):
self.memory = bytes + bytearray(256 - len(bytes))
print(type(self.memory))
print('mem 254', self.memory[254])
# print(self.memory)
def start(self):
@ -63,18 +61,16 @@ class CPU:
def step(self):
if self.IP >= 255: # TODO CHECK
self.IP = 0
print("IP:", self.IP)
print("IP:", toHex(self.IP))
self.instruction['opcode'] = self.memory[self.IP]
self.IP = self.IP+1
self.instruction['operand'] = self.memory[self.IP]
self.IP = self.IP+1
print(self.memory[self.IP -1], self.memory[self.IP-2])
print(self.instruction)
self.nums2mnems[self.instruction['opcode']](self, self.instruction['operand'])
print("instr:", self.instruction['opcode'], self.instruction['operand'])
print("instr:", toHex(self.instruction['opcode']), toHex(self.instruction['operand']))
print("mnem:", self.nums2mnems[self.instruction['opcode']])
print("acc:", self.acc)
print("acc:", self.acc, "N:", self.flags['N'])
print("running:", self.running)
print()
# self.print_screen()
@ -89,9 +85,15 @@ class CPU:
def lda_lit(self, operand):
self.acc = operand
self.flags['Z'] = True if self.acc == 0 else False
self.flags['Eq'] = True if self.acc == operand else False
self.flags['N'] = True if self.acc > 127 else False
def lda_mem(self, operand):
self.acc = self.memory[operand]
self.flags['Z'] = True if self.acc == 0 else False
self.flags['Eq'] = True if self.acc == operand else False
self.flags['N'] = True if self.acc > 127 else False
def sta_lit(self, operand):
self.memory[operand] = self.acc
@ -147,10 +149,12 @@ class CPU:
self.IP = operand
def jmp_mem(self, operand):
self.IP = memory[operand]
self.IP = self.memory[operand]
def ske(self, operand):
if self.flags['Eq']:
def ske(self, operand): # FIXME
# if self.flags['Eq']:
# self.IP += 2
if self.acc == operand:
self.IP += 2
def skz(self, operand):
@ -330,14 +334,20 @@ class Monitor:
cpu = CPU()
monitor = Monitor(cpu)
preamble = '00' * 64
prog = preamble + '02 01 13 f0 12 f0 04 02 03 f0 12 f0 05 41 08 00 06 40 00 00' # STRIPES
# preamble = '00 ' * 64
# prog = preamble + '02 01 13 f0 12 f0 04 02 03 f0 12 f0 05 41 08 00 06 40 00 00' # STRIPES
# offset = 64
# prog = preamble + '02 01 13 f0 12 f0 04 02 03 f0 05 08 09 00 04 09 03 f0 07 41 06' + toHex(offset) + '00 00'
#prog = '00'
program_bytes = bytearray.fromhex(prog.replace(" ", ""))
# program_bytes = bytearray.fromhex(prog.replace(" ", ""))
# Add jmp at addr 254:
#program_with_jump = program_bytes + bytearray(254 - len(program_bytes)) + bytearray.fromhex('0600') # jump to addr 00
program_with_jump = program_bytes + bytearray(254 - len(program_bytes)) + bytearray.fromhex('0640') # jump to addr 0x40 (dec 64)
cpu.load_memory(program_with_jump)
# program_with_jump = program_bytes + bytearray(254 - len(program_bytes)) + bytearray.fromhex('0640') # jump to addr 0x40 (dec 64)
with open('test-multiply2.bin', 'rb') as file:
program_bytes = bytearray(file.read())
cpu.load_memory(program_bytes)
monitor.run()