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cardiograph-computer
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Get simulator to run a few instructions

This commit is contained in:
n loewen 2025-02-28 12:30:11 +00:00
parent 7e842bd7a6
commit 61361c5f3f
1 changed files with 62 additions and 19 deletions
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81
src/cpu.mpy
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@ -1,3 +1,5 @@
import sys
class CPU: class CPU:
def __init__(self): def __init__(self):
self.running = False self.running = False
@ -9,41 +11,82 @@ class CPU:
def load_memory(self, bytes): def load_memory(self, bytes):
self.memory = bytes + bytearray(256 - len(bytes)) self.memory = bytes + bytearray(256 - len(bytes))
print(self.memory) print('mem 254', self.memory[254])
# print(self.memory)
def start(self):
self.running = True
def step(self): def step(self):
if self.IP >= 256: if self.IP >= 256:
self.IP = 0 self.IP = 0
print(self.IP) print("IP:", self.IP)
self.instruction['opcode'] = self.memory[self.IP] self.instruction['opcode'] = self.memory[self.IP]
self.IP = self.IP+1 self.IP = self.IP+1
self.instruction['operand'] = self.memory[self.IP] self.instruction['operand'] = self.memory[self.IP]
self.IP = self.IP+1 self.IP = self.IP+1
print(self.instruction) print("instr:", self.instruction['opcode'], self.instruction['operand'])
print("mnem:", self.nums2mnems[self.instruction['opcode']])
nums2mnems = { self.nums2mnems[self.instruction['opcode']](self, self.instruction['operand'])
'hlt': '00', print("acc:", self.acc)
'nop': '01', print("running:", self.running)
'add_lit': '04' print()
} if not self.running:
sys.exit()
def hlt(self):
self.running = false
def nop(self): def hlt(self, operand):
self.running = False
def nop(self, operand):
pass pass
def add_lit(num): def add_lit(self, operand):
self.acc = self.acc + num self.acc = self.acc + operand
def add_mem(self, operand):
self.acc = self.acc + self.memory[operand]
def jmp_lit(self, operand):
self.IP = operand
nums2mnems = {
0: hlt,
1: nop,
2: 'lda_lit',
3: 'sta_lit',
4: add_lit,
5: 'sub_lit',
6: jmp_lit,
7: 'ske',
8: 'skz',
9: 'skn',
10: 'skc',
11: 'cst',
12: 'ccl',
16: 'hlt',
17: 'nop',
18: 'lda_mem',
19: 'sta_mem',
20: add_mem,
21: 'sub_mem',
22: 'jmp_mem',
23: 'ske',
24: 'skz',
25: 'skn',
26: 'skc',
27: 'cst',
28: 'ccl',
}
cpu = CPU() cpu = CPU()
print(cpu)
print(cpu.running)
prog = '04 01 14 01 00 00' prog = '04 01 14 01 00 00'
b = bytes.fromhex(prog) program_bytes = bytes.fromhex(prog)
cpu.load_memory(b) # Add jmp at addr 254:
program_with_jump = program_bytes + bytearray(254 - len(program_bytes)) + bytes.fromhex('06 00')
cpu.load_memory(program_with_jump)
cpu.start()
cpu.step() cpu.step()
cpu.step() cpu.step()
cpu.step() cpu.step()