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Statically initialize CPU

This commit is contained in:
Matthias Endler 2021-01-29 00:14:50 +01:00
parent a4990eacbc
commit ad90d9294c
2 changed files with 68 additions and 61 deletions
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5
no-std-example/Cargo.toml
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@ -12,6 +12,11 @@ cortex-m-semihosting = "0.3.1"
panic-halt = "0.2.0"
mos6502 = { path = ".." }
[dependencies.once_cell]
version = "1.5.2"
default-features = false
features = []
# Uncomment for the panic example.
# panic-itm = "0.4.0"

124
no-std-example/src/main.rs
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@ -10,73 +10,75 @@ use cortex_m_rt::entry;
use mos6502::address::Address;
use mos6502::cpu;
use once_cell::unsync::Lazy;
#[entry]
fn main() -> ! {
loop {
let mut cpu = cpu::CPU::new();
let mut cpu = Lazy::new(|| cpu::CPU::new());
let zero_page_data = [
// ZeroPage data start
0x00, 0x02, // ADC ZeroPage target
0x00, 0x04, // ADC ZeroPageX target
0x00, 0x00, 0x00, 0x00, 0x10, // ADC IndexedIndirectX address
0x80, // ADC IndexedIndirectX address
0x00, 0x00, 0x00, 0x00, 0x00, 0x08, // ADC IndirectIndexedY address
0x80, // ADC IndirectIndexedY address
];
loop {
let zero_page_data = [
// ZeroPage data start
0x00, 0x02, // ADC ZeroPage target
0x00, 0x04, // ADC ZeroPageX target
0x00, 0x00, 0x00, 0x00, 0x10, // ADC IndexedIndirectX address
0x80, // ADC IndexedIndirectX address
0x00, 0x00, 0x00, 0x00, 0x00, 0x08, // ADC IndirectIndexedY address
0x80, // ADC IndirectIndexedY address
];
let program = [
// Code start
0xA9, // LDA Immediate
0x01, // Immediate operand
0x69, // ADC Immediate
0x07, // Immediate operand
0x65, // ADC ZeroPage
0x01, // ZeroPage operand
0xA2, // LDX Immediate
0x01, // Immediate operand
0x75, // ADC ZeroPageX
0x02, // ZeroPageX operand
0x6D, // ADC Absolute
0x01, // Absolute operand
0x80, // Absolute operand
0xA2, // LDX immediate
0x08, // Immediate operand
0x7D, // ADC AbsoluteX
0x00, // AbsoluteX operand
0x80, // AbsoluteX operand
0xA0, // LDY immediate
0x04, // Immediate operand
0x79, // ADC AbsoluteY
0x00, // AbsoluteY operand
0x80, // AbsoluteY operand
0xA2, // LDX immediate
0x05, // Immediate operand
0x61, // ADC IndexedIndirectX
0x03, // IndexedIndirectX operand
0xA0, // LDY immediate
0x10, // Immediate operand
0x71, // ADC IndirectIndexedY
0x0F, // IndirectIndexedY operand
0xEA, // NOP :)
0xFF, // Something invalid -- the end!
];
let program = [
// Code start
0xA9, // LDA Immediate
0x01, // Immediate operand
0x69, // ADC Immediate
0x07, // Immediate operand
0x65, // ADC ZeroPage
0x01, // ZeroPage operand
0xA2, // LDX Immediate
0x01, // Immediate operand
0x75, // ADC ZeroPageX
0x02, // ZeroPageX operand
0x6D, // ADC Absolute
0x01, // Absolute operand
0x80, // Absolute operand
0xA2, // LDX immediate
0x08, // Immediate operand
0x7D, // ADC AbsoluteX
0x00, // AbsoluteX operand
0x80, // AbsoluteX operand
0xA0, // LDY immediate
0x04, // Immediate operand
0x79, // ADC AbsoluteY
0x00, // AbsoluteY operand
0x80, // AbsoluteY operand
0xA2, // LDX immediate
0x05, // Immediate operand
0x61, // ADC IndexedIndirectX
0x03, // IndexedIndirectX operand
0xA0, // LDY immediate
0x10, // Immediate operand
0x71, // ADC IndirectIndexedY
0x0F, // IndirectIndexedY operand
0xEA, // NOP :)
0xFF, // Something invalid -- the end!
];
let data: [u8; 25] = [
0x00, 0x09, // ADC Absolute target
0x00, 0x00, 0x40, // ADC AbsoluteY target
0x00, 0x00, 0x00, 0x11, // ADC AbsoluteX target
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, // ADC IndexedIndirectX target
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, // ADC IndirectIndexedY target
];
let data: [u8; 25] = [
0x00, 0x09, // ADC Absolute target
0x00, 0x00, 0x40, // ADC AbsoluteY target
0x00, 0x00, 0x00, 0x11, // ADC AbsoluteX target
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, // ADC IndexedIndirectX target
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, // ADC IndirectIndexedY target
];
// "Load" a program
cpu.memory.set_bytes(Address(0x0000), &zero_page_data);
cpu.memory.set_bytes(Address(0x4000), &program);
cpu.memory.set_bytes(Address(0x8000), &data);
// "Load" a program
cpu.memory.set_bytes(Address(0x0000), &zero_page_data);
cpu.memory.set_bytes(Address(0x4000), &program);
cpu.memory.set_bytes(Address(0x8000), &data);
cpu.registers.program_counter = Address(0x4000);
cpu.registers.program_counter = Address(0x4000);
cpu.run();
}
cpu.run();
}
}