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feat(dma): implement all dma i/o reads

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-29 01:30:12 -03:00
parent 3e62feacba
commit 268961262d
3 changed files with 34 additions and 14 deletions
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11
src/util.zig
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@@ -12,9 +12,9 @@ pub fn sext(comptime T: type, comptime U: type, value: T) T {
const iT = std.meta.Int(.signed, @typeInfo(T).Int.bits);
const ExtU = if (@typeInfo(U).Int.signedness == .unsigned) T else iT;
const shift = @intCast(Log2Int(T), @typeInfo(T).Int.bits - @typeInfo(U).Int.bits);
const shift_amt = @intCast(Log2Int(T), @typeInfo(T).Int.bits - @typeInfo(U).Int.bits);
return @bitCast(T, @bitCast(iT, @as(ExtU, @truncate(U, value)) << shift) >> shift);
return @bitCast(T, @bitCast(iT, @as(ExtU, @truncate(U, value)) << shift_amt) >> shift_amt);
}
/// See https://godbolt.org/z/W3en9Eche
@@ -276,6 +276,13 @@ pub const audio = struct {
};
};
/// Calculates the correct shift offset for an aligned/unaligned u8 read
///
/// TODO: Rename this
pub inline fn shift(byte: u8) u4 {
return @truncate(u4, byte & 1) << 3;
}
/// Sets the high bits of an integer to a value
pub inline fn setLo(comptime T: type, left: T, right: HalfInt(T)) T {
return switch (T) {