perfect6502_sys/
lib.rs

1//! Bindings to perfect6502.
2
3#![no_std]
4
5include!("./bindings.rs");
6
7#[cfg(test)]
8mod tests {
9    use super::*;
10
11    #[test]
12    fn lda_imm() {
13        unsafe {
14            let state = initAndResetChip();
15            assert!(!state.is_null());
16
17            // Write 0x0200 to the reset vector.
18            memory[0xFFFC] = 0x00;
19            memory[0xFFFD] = 0x02;
20
21            // Write LDA #$EF to 0x0200.
22            memory[0x0200] = 0xA9;
23            memory[0x0201] = 0xEF;
24
25            let sp = readSP(state);
26
27            // Execute the 9-cycle reset sequence.
28            for _ in 0..9 {
29                step(state);
30                step(state);
31            }
32
33            // The stack pointer is decremented three times during the reset
34            // sequence.
35            assert_eq!(readSP(state), sp - 3);
36
37            // PC is at the reset vector.
38            assert_eq!(readPC(state), 0x0200);
39
40            let x = readX(state);
41            let y = readY(state);
42
43            // Execute the first cycle of LDA #$EF.
44            step(state);
45            step(state);
46
47            assert_eq!(readIR(state), 0xA9);
48            assert_eq!(readRW(state), 1);
49            assert_eq!(readAddressBus(state), 0x201);
50            assert_eq!(readDataBus(state), 0xEF);
51            
52            // Execute the second cycle of LDA #$EF.
53            step(state);
54            step(state);
55
56            assert_eq!(readA(state), 0xEF);
57
58            // X and Y are unchanged.
59            assert_eq!(readX(state), x);
60            assert_eq!(readY(state), y);
61
62            // The Zero flag is clear.
63            assert_eq!(readP(state) & 0x02, 0);
64
65            // There was 22 half cycles, i.e., we called step 22 times.
66            assert_eq!(cycle, 22);
67
68            destroyChip(state);
69        }
70    }
71}
perfect6502_sys/lib.rs

perfect6502_sys/
lib.rs
