fix(io): respect read-only bits in DISPSTAT
Superstar Saga now renders correctly
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@@ -317,14 +317,23 @@ pub const DisplayControl = extern union {
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/// Read / Write
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pub const DisplayStatus = extern union {
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/// read-only
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vblank: Bit(u16, 0),
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/// read-only
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hblank: Bit(u16, 1),
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// read-only
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coincidence: Bit(u16, 2),
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vblank_irq: Bit(u16, 3),
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hblank_irq: Bit(u16, 4),
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vcount_irq: Bit(u16, 5),
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vcount_trigger: Bitfield(u16, 8, 8),
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raw: u16,
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pub fn set(self: *DisplayStatus, value: u16) void {
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const mask: u16 = 0x00C7; // set bits are read-only
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self.raw = (self.raw & mask) | (value & ~mask);
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}
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};
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/// Read Only
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