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Statically initialize CPU

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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" panic-halt = "0.2.0"
mos6502 = { path = ".." } mos6502 = { path = ".." }
[dependencies.once_cell]
version = "1.5.2"
default-features = false
features = []
# Uncomment for the panic example. # Uncomment for the panic example.
# panic-itm = "0.4.0" # 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::address::Address;
use mos6502::cpu; use mos6502::cpu;
use once_cell::unsync::Lazy;
#[entry] #[entry]
fn main() -> ! { fn main() -> ! {
loop { let mut cpu = Lazy::new(|| cpu::CPU::new());
let mut cpu = cpu::CPU::new();
let zero_page_data = [ loop {
// ZeroPage data start let zero_page_data = [
0x00, 0x02, // ADC ZeroPage target // ZeroPage data start
0x00, 0x04, // ADC ZeroPageX target 0x00, 0x02, // ADC ZeroPage target
0x00, 0x00, 0x00, 0x00, 0x10, // ADC IndexedIndirectX address 0x00, 0x04, // ADC ZeroPageX target
0x80, // ADC IndexedIndirectX address 0x00, 0x00, 0x00, 0x00, 0x10, // ADC IndexedIndirectX address
0x00, 0x00, 0x00, 0x00, 0x00, 0x08, // ADC IndirectIndexedY address 0x80, // ADC IndexedIndirectX address
0x80, // ADC IndirectIndexedY address 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, // ADC IndirectIndexedY address
]; 0x80, // ADC IndirectIndexedY address
];
let program = [ let program = [
// Code start // Code start
0xA9, // LDA Immediate 0xA9, // LDA Immediate
0x01, // Immediate operand 0x01, // Immediate operand
0x69, // ADC Immediate 0x69, // ADC Immediate
0x07, // Immediate operand 0x07, // Immediate operand
0x65, // ADC ZeroPage 0x65, // ADC ZeroPage
0x01, // ZeroPage operand 0x01, // ZeroPage operand
0xA2, // LDX Immediate 0xA2, // LDX Immediate
0x01, // Immediate operand 0x01, // Immediate operand
0x75, // ADC ZeroPageX 0x75, // ADC ZeroPageX
0x02, // ZeroPageX operand 0x02, // ZeroPageX operand
0x6D, // ADC Absolute 0x6D, // ADC Absolute
0x01, // Absolute operand 0x01, // Absolute operand
0x80, // Absolute operand 0x80, // Absolute operand
0xA2, // LDX immediate 0xA2, // LDX immediate
0x08, // Immediate operand 0x08, // Immediate operand
0x7D, // ADC AbsoluteX 0x7D, // ADC AbsoluteX
0x00, // AbsoluteX operand 0x00, // AbsoluteX operand
0x80, // AbsoluteX operand 0x80, // AbsoluteX operand
0xA0, // LDY immediate 0xA0, // LDY immediate
0x04, // Immediate operand 0x04, // Immediate operand
0x79, // ADC AbsoluteY 0x79, // ADC AbsoluteY
0x00, // AbsoluteY operand 0x00, // AbsoluteY operand
0x80, // AbsoluteY operand 0x80, // AbsoluteY operand
0xA2, // LDX immediate 0xA2, // LDX immediate
0x05, // Immediate operand 0x05, // Immediate operand
0x61, // ADC IndexedIndirectX 0x61, // ADC IndexedIndirectX
0x03, // IndexedIndirectX operand 0x03, // IndexedIndirectX operand
0xA0, // LDY immediate 0xA0, // LDY immediate
0x10, // Immediate operand 0x10, // Immediate operand
0x71, // ADC IndirectIndexedY 0x71, // ADC IndirectIndexedY
0x0F, // IndirectIndexedY operand 0x0F, // IndirectIndexedY operand
0xEA, // NOP :) 0xEA, // NOP :)
0xFF, // Something invalid -- the end! 0xFF, // Something invalid -- the end!
]; ];
let data: [u8; 25] = [ let data: [u8; 25] = [
0x00, 0x09, // ADC Absolute target 0x00, 0x09, // ADC Absolute target
0x00, 0x00, 0x40, // ADC AbsoluteY target 0x00, 0x00, 0x40, // ADC AbsoluteY target
0x00, 0x00, 0x00, 0x11, // ADC AbsoluteX 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, 0x12, // ADC IndexedIndirectX target
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, // ADC IndirectIndexedY target 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, // ADC IndirectIndexedY target
]; ];
// "Load" a program // "Load" a program
cpu.memory.set_bytes(Address(0x0000), &zero_page_data); cpu.memory.set_bytes(Address(0x0000), &zero_page_data);
cpu.memory.set_bytes(Address(0x4000), &program); cpu.memory.set_bytes(Address(0x4000), &program);
cpu.memory.set_bytes(Address(0x8000), &data); cpu.memory.set_bytes(Address(0x8000), &data);
cpu.registers.program_counter = Address(0x4000); cpu.registers.program_counter = Address(0x4000);
cpu.run(); cpu.run();
} }
} }