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Start working on keyboard input - works when running the simulator, but no 'monitor mode' yet

This commit is contained in:
n loewen 2025-03-03 20:35:46 +00:00
parent 6e58241288
commit fa504685d2
2 changed files with 31 additions and 104 deletions
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92
src/cpu.mpy
View File

@ -1,92 +0,0 @@
import sys
class CPU:
def __init__(self):
self.running = False
self.IP = 254
self.acc = 0
self.flags = { 'C': False, 'Z': False, 'N': False, 'Eq': False }
self.instruction = { 'opcode': False, 'operand': False }
self.memory = False
def load_memory(self, bytes):
self.memory = bytes + bytearray(256 - len(bytes))
print('mem 254', self.memory[254])
# print(self.memory)
def start(self):
self.running = True
def step(self):
if self.IP >= 256:
self.IP = 0
print("IP:", 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("instr:", self.instruction['opcode'], self.instruction['operand'])
print("mnem:", self.nums2mnems[self.instruction['opcode']])
self.nums2mnems[self.instruction['opcode']](self, self.instruction['operand'])
print("acc:", self.acc)
print("running:", self.running)
print()
if not self.running:
sys.exit()
def hlt(self, operand):
self.running = False
def nop(self, operand):
pass
def add_lit(self, operand):
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()
prog = '04 01 14 01 00 00'
program_bytes = bytes.fromhex(prog)
# 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()

43
src/cpu.py
View File

@ -1,4 +1,5 @@
import sys
from sys import exit
from time import sleep
class CPU:
def __init__(self):
@ -11,6 +12,7 @@ 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)
@ -29,7 +31,21 @@ class CPU:
print("_", end=" ")
print()
def read_keys(self):
key = input(">").upper()
if self.running:
if key in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']:
print(type(self.memory))
self.memory[26] = int(key)
if key in ['A', 'B', 'C', 'D', 'E', 'F']:
self.memory[26] = ord(key) - 55
if key == "H": # halt
self.running = False
else:
# TODO trainer interface
def step(self):
self.read_keys()
if self.IP >= 256:
self.IP = 0
print("IP:", self.IP)
@ -44,9 +60,16 @@ class CPU:
print("running:", self.running)
print()
self.print_screen()
print("byte 26 (keyboard):", self.memory[26])
print()
if not self.running:
sys.exit()
# if not self.running:
# exit()
def run(self):
self.start()
while True:
self.step()
sleep(0.1)
def hlt(self, operand):
self.running = False
@ -170,16 +193,12 @@ class CPU:
cpu = CPU()
prog = '04 FF 04 01 14 01 00 00'
program_bytes = bytes.fromhex(prog)
program_bytes = bytearray.fromhex(prog)
# Add jmp at addr 254:
program_with_jump = program_bytes + bytearray(254 - len(program_bytes)) + bytes.fromhex('06 00')
program_with_jump = program_bytes + bytearray(254 - len(program_bytes)) + bytearray.fromhex('06 00')
cpu.load_memory(program_with_jump)
cpu.print_screen()
# cpu.start()
# cpu.step()
cpu.start()
cpu.step()
cpu.step()
cpu.step()
cpu.step()
cpu.step()
cpu.run()