style(eeprom): move eeprom code to it's own file
This commit is contained in:
parent
13f6ee8ec4
commit
cb0eb67e4b
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@ -2,6 +2,8 @@ const std = @import("std");
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const Allocator = std.mem.Allocator;
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const log = std.log.scoped(.Backup);
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const Eeprom = @import("backup/eeprom.zig").Eeprom;
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const escape = @import("../../util.zig").escape;
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const span = @import("../../util.zig").span;
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@ -55,7 +57,7 @@ pub const Backup = struct {
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.title = title,
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.save_path = path,
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.flash = Flash.init(),
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.eeprom = Eeprom.init(allocator),
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.eeprom = Eeprom.create(allocator),
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};
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if (backup.save_path) |p| backup.loadSaveFromDisk(allocator, p) catch |e| log.err("Failed to load save: {}", .{e});
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@ -300,267 +302,3 @@ const Flash = struct {
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return if (self.bank == 1) 0x10000 else @as(usize, 0);
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}
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};
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const Eeprom = struct {
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const Self = @This();
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addr: u14,
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kind: Kind,
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state: State,
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writer: Writer,
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reader: Reader,
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allocator: Allocator,
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const Kind = enum {
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Unknown,
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Small, // 512B
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Large, // 8KB
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};
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const State = enum {
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Ready,
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Read,
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Write,
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WriteTransfer,
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RequestEnd,
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};
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fn init(allocator: Allocator) Self {
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return .{
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.kind = .Unknown,
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.state = .Ready,
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.writer = Writer.init(),
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.reader = Reader.init(),
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.addr = 0,
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.allocator = allocator,
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};
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}
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pub fn read(self: *Self) u1 {
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return self.reader.read();
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}
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pub fn dbgRead(self: *const Self) u1 {
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return self.reader.dbgRead();
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}
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pub fn write(self: *Self, word_count: u16, buf: *[]u8, bit: u1) void {
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if (self.guessKind(word_count)) |found| {
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log.info("EEPROM Kind: {}", .{found});
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self.kind = found;
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// buf.len will not equal zero when a save file was found and loaded.
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// Right now, we assume that the save file is of the correct size which
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// isn't necessarily true, since we can't trust anything a user can influence
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// TODO: use ?[]u8 instead of a 0-sized slice?
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if (buf.len == 0) {
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const len: usize = switch (found) {
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.Small => 0x200,
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.Large => 0x2000,
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else => unreachable,
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};
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buf.* = self.allocator.alloc(u8, len) catch |e| {
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log.err("Failed to resize EEPROM buf to {} bytes", .{len});
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std.debug.panic("EEPROM entered irrecoverable state {}", .{e});
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};
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std.mem.set(u8, buf.*, 0xFF);
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}
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}
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if (self.state == .RequestEnd) {
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if (bit != 0) log.debug("EEPROM Request did not end in 0u1. TODO: is this ok?", .{});
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self.state = .Ready;
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return;
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}
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switch (self.state) {
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.Ready => self.writer.requestWrite(bit),
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.Read, .Write => self.writer.addressWrite(self.kind, bit),
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.WriteTransfer => self.writer.dataWrite(bit),
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.RequestEnd => unreachable, // We return early just above this block
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}
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self.tick(buf.*);
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}
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fn guessKind(self: *const Self, word_count: u16) ?Kind {
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if (self.kind != .Unknown or self.state != .Read) return null;
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return switch (word_count) {
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17 => .Large,
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9 => .Small,
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else => blk: {
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log.err("Unexpected length of DMA3 Transfer upon initial EEPROM read: {}", .{word_count});
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break :blk null;
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},
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};
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}
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fn tick(self: *Self, buf: []u8) void {
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switch (self.state) {
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.Ready => {
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if (self.writer.len() == 2) {
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const req = @intCast(u2, self.writer.finish());
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switch (req) {
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0b11 => self.state = .Read,
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0b10 => self.state = .Write,
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else => log.err("Unknown EEPROM Request 0b{b:0>2}", .{req}),
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}
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}
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},
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.Read => {
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switch (self.kind) {
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.Large => {
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if (self.writer.len() == 14) {
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const addr = @intCast(u10, self.writer.finish());
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const value = std.mem.readIntSliceLittle(u64, buf[@as(u13, addr) * 8 ..][0..8]);
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self.reader.configure(value);
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self.state = .RequestEnd;
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}
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},
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.Small => {
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if (self.writer.len() == 6) {
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// FIXME: Duplicated code from above
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const addr = @intCast(u6, self.writer.finish());
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const value = std.mem.readIntSliceLittle(u64, buf[@as(u13, addr) * 8 ..][0..8]);
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self.reader.configure(value);
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self.state = .RequestEnd;
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}
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},
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else => log.err("Unable to calculate EEPROM read address. EEPROM size UNKNOWN", .{}),
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}
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},
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.Write => {
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switch (self.kind) {
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.Large => {
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if (self.writer.len() == 14) {
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self.addr = @intCast(u10, self.writer.finish());
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self.state = .WriteTransfer;
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}
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},
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.Small => {
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if (self.writer.len() == 6) {
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self.addr = @intCast(u6, self.writer.finish());
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self.state = .WriteTransfer;
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}
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},
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else => log.err("Unable to calculate EEPROM write address. EEPROM size UNKNOWN", .{}),
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}
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},
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.WriteTransfer => {
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if (self.writer.len() == 64) {
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std.mem.writeIntSliceLittle(u64, buf[self.addr * 8 ..][0..8], self.writer.finish());
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self.state = .RequestEnd;
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}
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},
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.RequestEnd => unreachable, // We return early in write() if state is .RequestEnd
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}
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}
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const Reader = struct {
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const This = @This();
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data: u64,
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i: u8,
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enabled: bool,
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fn init() This {
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return .{
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.data = 0,
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.i = 0,
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.enabled = false,
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};
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}
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fn configure(self: *This, value: u64) void {
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self.data = value;
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self.i = 0;
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self.enabled = true;
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}
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fn read(self: *This) u1 {
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if (!self.enabled) return 1;
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const bit = if (self.i < 4) blk: {
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break :blk 0;
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} else blk: {
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const idx = @intCast(u6, 63 - (self.i - 4));
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break :blk @truncate(u1, self.data >> idx);
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};
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self.i = (self.i + 1) % (64 + 4);
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if (self.i == 0) self.enabled = false;
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return bit;
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}
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fn dbgRead(self: *const This) u1 {
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if (!self.enabled) return 1;
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const bit = if (self.i < 4) blk: {
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break :blk 0;
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} else blk: {
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const idx = @intCast(u6, 63 - (self.i - 4));
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break :blk @truncate(u1, self.data >> idx);
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};
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return bit;
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}
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};
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const Writer = struct {
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const This = @This();
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data: u64,
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i: u8,
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fn init() This {
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return .{ .data = 0, .i = 0 };
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}
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fn requestWrite(self: *This, bit: u1) void {
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const idx = @intCast(u1, 1 - self.i);
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self.data = (self.data & ~(@as(u64, 1) << idx)) | (@as(u64, bit) << idx);
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self.i += 1;
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}
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fn addressWrite(self: *This, kind: Eeprom.Kind, bit: u1) void {
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if (kind == .Unknown) return;
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const size: u4 = switch (kind) {
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.Large => 13,
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.Small => 5,
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.Unknown => unreachable,
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};
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const idx = @intCast(u4, size - self.i);
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self.data = (self.data & ~(@as(u64, 1) << idx)) | (@as(u64, bit) << idx);
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self.i += 1;
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}
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fn dataWrite(self: *This, bit: u1) void {
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const idx = @intCast(u6, 63 - self.i);
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self.data = (self.data & ~(@as(u64, 1) << idx)) | (@as(u64, bit) << idx);
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self.i += 1;
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}
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fn len(self: *const This) u8 {
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return self.i;
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}
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fn finish(self: *This) u64 {
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defer self.reset();
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return self.data;
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}
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fn reset(self: *This) void {
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self.i = 0;
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self.data = 0;
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}
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};
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};
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@ -0,0 +1,269 @@
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const log = std.log.scoped(.Eeprom);
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pub const Eeprom = struct {
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const Self = @This();
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addr: u14,
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kind: Kind,
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state: State,
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writer: Writer,
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reader: Reader,
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allocator: Allocator,
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const Kind = enum {
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Unknown,
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Small, // 512B
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Large, // 8KB
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};
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const State = enum {
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Ready,
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Read,
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Write,
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WriteTransfer,
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RequestEnd,
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};
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pub fn read(self: *Self) u1 {
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return self.reader.read();
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}
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pub fn dbgRead(self: *const Self) u1 {
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return self.reader.dbgRead();
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}
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pub fn write(self: *Self, word_count: u16, buf: *[]u8, bit: u1) void {
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if (self.guessKind(word_count)) |found| {
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log.info("EEPROM Kind: {}", .{found});
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self.kind = found;
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// buf.len will not equal zero when a save file was found and loaded.
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// Right now, we assume that the save file is of the correct size which
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// isn't necessarily true, since we can't trust anything a user can influence
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// TODO: use ?[]u8 instead of a 0-sized slice?
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if (buf.len == 0) {
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const len: usize = switch (found) {
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.Small => 0x200,
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.Large => 0x2000,
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else => unreachable,
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};
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buf.* = self.allocator.alloc(u8, len) catch |e| {
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log.err("Failed to resize EEPROM buf to {} bytes", .{len});
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std.debug.panic("EEPROM entered irrecoverable state {}", .{e});
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};
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std.mem.set(u8, buf.*, 0xFF);
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}
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}
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if (self.state == .RequestEnd) {
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if (bit != 0) log.debug("EEPROM Request did not end in 0u1. TODO: is this ok?", .{});
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self.state = .Ready;
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return;
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}
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switch (self.state) {
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.Ready => self.writer.requestWrite(bit),
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.Read, .Write => self.writer.addressWrite(self.kind, bit),
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.WriteTransfer => self.writer.dataWrite(bit),
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.RequestEnd => unreachable, // We return early just above this block
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}
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self.tick(buf.*);
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}
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pub fn create(allocator: Allocator) Self {
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return .{
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.kind = .Unknown,
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.state = .Ready,
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.writer = Writer.create(),
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.reader = Reader.create(),
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.addr = 0,
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.allocator = allocator,
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};
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}
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fn guessKind(self: *const Self, word_count: u16) ?Kind {
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if (self.kind != .Unknown or self.state != .Read) return null;
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return switch (word_count) {
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17 => .Large,
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9 => .Small,
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else => blk: {
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log.err("Unexpected length of DMA3 Transfer upon initial EEPROM read: {}", .{word_count});
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break :blk null;
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},
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};
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}
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fn tick(self: *Self, buf: []u8) void {
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switch (self.state) {
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.Ready => {
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if (self.writer.len() == 2) {
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const req = @intCast(u2, self.writer.finish());
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switch (req) {
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0b11 => self.state = .Read,
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0b10 => self.state = .Write,
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else => log.err("Unknown EEPROM Request 0b{b:0>2}", .{req}),
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}
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}
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},
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.Read => {
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switch (self.kind) {
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.Large => {
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if (self.writer.len() == 14) {
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const addr = @intCast(u10, self.writer.finish());
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const value = std.mem.readIntSliceLittle(u64, buf[@as(u13, addr) * 8 ..][0..8]);
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self.reader.configure(value);
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self.state = .RequestEnd;
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}
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},
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.Small => {
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if (self.writer.len() == 6) {
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// FIXME: Duplicated code from above
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const addr = @intCast(u6, self.writer.finish());
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const value = std.mem.readIntSliceLittle(u64, buf[@as(u13, addr) * 8 ..][0..8]);
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self.reader.configure(value);
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self.state = .RequestEnd;
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}
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},
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else => log.err("Unable to calculate EEPROM read address. EEPROM size UNKNOWN", .{}),
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}
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},
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.Write => {
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switch (self.kind) {
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.Large => {
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if (self.writer.len() == 14) {
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self.addr = @intCast(u10, self.writer.finish());
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self.state = .WriteTransfer;
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}
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},
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.Small => {
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if (self.writer.len() == 6) {
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self.addr = @intCast(u6, self.writer.finish());
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self.state = .WriteTransfer;
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}
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},
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else => log.err("Unable to calculate EEPROM write address. EEPROM size UNKNOWN", .{}),
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}
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},
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.WriteTransfer => {
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if (self.writer.len() == 64) {
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std.mem.writeIntSliceLittle(u64, buf[self.addr * 8 ..][0..8], self.writer.finish());
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self.state = .RequestEnd;
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}
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},
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.RequestEnd => unreachable, // We return early in write() if state is .RequestEnd
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}
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}
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};
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const Reader = struct {
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const Self = @This();
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data: u64,
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i: u8,
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enabled: bool,
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fn create() Self {
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return .{
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.data = 0,
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.i = 0,
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.enabled = false,
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};
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}
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fn read(self: *Self) u1 {
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if (!self.enabled) return 1;
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const bit = if (self.i < 4) blk: {
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break :blk 0;
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} else blk: {
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const idx = @intCast(u6, 63 - (self.i - 4));
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break :blk @truncate(u1, self.data >> idx);
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};
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self.i = (self.i + 1) % (64 + 4);
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if (self.i == 0) self.enabled = false;
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return bit;
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}
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fn dbgRead(self: *const Self) u1 {
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if (!self.enabled) return 1;
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const bit = if (self.i < 4) blk: {
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break :blk 0;
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} else blk: {
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const idx = @intCast(u6, 63 - (self.i - 4));
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break :blk @truncate(u1, self.data >> idx);
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};
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return bit;
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}
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fn configure(self: *Self, value: u64) void {
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self.data = value;
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self.i = 0;
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self.enabled = true;
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}
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};
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const Writer = struct {
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const Self = @This();
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data: u64,
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i: u8,
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fn create() Self {
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return .{ .data = 0, .i = 0 };
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}
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fn requestWrite(self: *Self, bit: u1) void {
|
||||
const idx = @intCast(u1, 1 - self.i);
|
||||
self.data = (self.data & ~(@as(u64, 1) << idx)) | (@as(u64, bit) << idx);
|
||||
self.i += 1;
|
||||
}
|
||||
|
||||
fn addressWrite(self: *Self, kind: Eeprom.Kind, bit: u1) void {
|
||||
if (kind == .Unknown) return;
|
||||
|
||||
const size: u4 = switch (kind) {
|
||||
.Large => 13,
|
||||
.Small => 5,
|
||||
.Unknown => unreachable,
|
||||
};
|
||||
|
||||
const idx = @intCast(u4, size - self.i);
|
||||
self.data = (self.data & ~(@as(u64, 1) << idx)) | (@as(u64, bit) << idx);
|
||||
self.i += 1;
|
||||
}
|
||||
|
||||
fn dataWrite(self: *Self, bit: u1) void {
|
||||
const idx = @intCast(u6, 63 - self.i);
|
||||
self.data = (self.data & ~(@as(u64, 1) << idx)) | (@as(u64, bit) << idx);
|
||||
self.i += 1;
|
||||
}
|
||||
|
||||
fn len(self: *const Self) u8 {
|
||||
return self.i;
|
||||
}
|
||||
|
||||
fn finish(self: *Self) u64 {
|
||||
defer self.reset();
|
||||
return self.data;
|
||||
}
|
||||
|
||||
fn reset(self: *Self) void {
|
||||
self.i = 0;
|
||||
self.data = 0;
|
||||
}
|
||||
};
|
||||
Loading…
Reference in New Issue