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style(flash): move flash code into it's own file

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-10 11:43:21 -03:00
parent cb0eb67e4b
commit 8028394105
2 changed files with 75 additions and 74 deletions
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77
src/core/bus/backup.zig
View File

@ -3,6 +3,7 @@ const Allocator = std.mem.Allocator;
const log = std.log.scoped(.Backup);
const Eeprom = @import("backup/eeprom.zig").Eeprom;
const Flash = @import("backup/Flash.zig");
const escape = @import("../../util.zig").escape;
const span = @import("../../util.zig").span;
@ -56,7 +57,7 @@ pub const Backup = struct {
.kind = kind,
.title = title,
.save_path = path,
.flash = Flash.init(),
.flash = Flash.create(),
.eeprom = Eeprom.create(allocator),
};
@ -186,7 +187,7 @@ pub const Backup = struct {
switch (self.kind) {
.Flash, .Flash1M => {
if (self.flash.prep_write) return self.flash.write(self.buf, addr, byte);
if (self.flash.shouldEraseSector(addr, byte)) return self.flash.eraseSector(self.buf, addr);
if (self.flash.shouldEraseSector(addr, byte)) return self.flash.erase(self.buf, addr);
switch (addr) {
0x0000 => if (self.kind == .Flash1M and self.flash.set_bank) {
@ -230,75 +231,3 @@ const Needle = struct {
const SaveError = error{
UnsupportedBackupKind,
};
const Flash = struct {
const Self = @This();
state: State,
id_mode: bool,
set_bank: bool,
prep_erase: bool,
prep_write: bool,
bank: u1,
const State = enum {
Ready,
Set,
Command,
};
fn init() Self {
return .{
.state = .Ready,
.id_mode = false,
.set_bank = false,
.prep_erase = false,
.prep_write = false,
.bank = 0,
};
}
fn handleCommand(self: *Self, buf: []u8, byte: u8) void {
switch (byte) {
0x90 => self.id_mode = true,
0xF0 => self.id_mode = false,
0xB0 => self.set_bank = true,
0x80 => self.prep_erase = true,
0x10 => {
std.mem.set(u8, buf, 0xFF);
self.prep_erase = false;
},
0xA0 => self.prep_write = true,
else => std.debug.panic("Unhandled Flash Command: 0x{X:0>2}", .{byte}),
}
self.state = .Ready;
}
fn shouldEraseSector(self: *const Self, addr: usize, byte: u8) bool {
return self.state == .Command and self.prep_erase and byte == 0x30 and addr & 0xFFF == 0x000;
}
fn write(self: *Self, buf: []u8, idx: usize, byte: u8) void {
buf[self.baseAddress() + idx] = byte;
self.prep_write = false;
}
fn read(self: *const Self, buf: []u8, idx: usize) u8 {
return buf[self.baseAddress() + idx];
}
fn eraseSector(self: *Self, buf: []u8, idx: usize) void {
const start = self.baseAddress() + (idx & 0xF000);
std.mem.set(u8, buf[start..][0..0x1000], 0xFF);
self.prep_erase = false;
self.state = .Ready;
}
inline fn baseAddress(self: *const Self) usize {
return if (self.bank == 1) 0x10000 else @as(usize, 0);
}
};

72
src/core/bus/backup/Flash.zig Normal file
View File

@ -0,0 +1,72 @@
const std = @import("std");
const Self = @This();
state: State,
id_mode: bool,
set_bank: bool,
prep_erase: bool,
prep_write: bool,
bank: u1,
const State = enum {
Ready,
Set,
Command,
};
pub fn read(self: *const Self, buf: []u8, idx: usize) u8 {
return buf[self.address() + idx];
}
pub fn write(self: *Self, buf: []u8, idx: usize, byte: u8) void {
buf[self.address() + idx] = byte;
self.prep_write = false;
}
pub fn create() Self {
return .{
.state = .Ready,
.id_mode = false,
.set_bank = false,
.prep_erase = false,
.prep_write = false,
.bank = 0,
};
}
pub fn handleCommand(self: *Self, buf: []u8, byte: u8) void {
switch (byte) {
0x90 => self.id_mode = true,
0xF0 => self.id_mode = false,
0xB0 => self.set_bank = true,
0x80 => self.prep_erase = true,
0x10 => {
std.mem.set(u8, buf, 0xFF);
self.prep_erase = false;
},
0xA0 => self.prep_write = true,
else => std.debug.panic("Unhandled Flash Command: 0x{X:0>2}", .{byte}),
}
self.state = .Ready;
}
pub fn shouldEraseSector(self: *const Self, addr: usize, byte: u8) bool {
return self.state == .Command and self.prep_erase and byte == 0x30 and addr & 0xFFF == 0x000;
}
pub fn erase(self: *Self, buf: []u8, sector: usize) void {
const start = self.address() + (sector & 0xF000);
std.mem.set(u8, buf[start..][0..0x1000], 0xFF);
self.prep_erase = false;
self.state = .Ready;
}
/// Base Address
inline fn address(self: *const Self) usize {
return if (self.bank == 1) 0x10000 else @as(usize, 0);
}