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index register select flag

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This commit is contained in:
Franco Colmenarez
2022-06-29 19:33:25 -05:00
parent f22328b678
commit 52d63a7ae7
1 changed files with 16 additions and 0 deletions
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snes-core/src/cpu.rs
+16
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@@ -65,6 +65,15 @@ impl Registers {
self.p = self.p | ((val as u8) << 3);
}
pub fn get_index_register_select_flag(&self) -> bool {
((self.p & 0b0001_0000) >> 4) == 1
}
pub fn set_index_register_select_flag(&mut self, val: bool) {
self.p = self.p & 0b1110_1111;
self.p = self.p | ((val as u8) << 4);
}
pub fn get_break_instruction_flag(&self) -> bool {
((self.p & 0b0001_0000) >> 4) == 1
}
@@ -283,6 +292,13 @@ mod cpu_registers_tests {
assert!(!registers.get_memory_select_flag());
assert_eq!(registers.p, 0b0000_0000);
registers.set_index_register_select_flag(true);
assert!(registers.get_index_register_select_flag());
assert_eq!(registers.p, 0b0001_0000);
registers.set_index_register_select_flag(false);
assert!(!registers.get_index_register_select_flag());
assert_eq!(registers.p, 0b0000_0000);
registers.set_break_instruction_flag(true);
assert!(registers.get_break_instruction_flag());
assert_eq!(registers.p, 0b0001_0000);