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feat(serial): support disconnected Joybus configuration and local registers

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0xrsydn 2026-10-07 06:36:54 +07:00
commit 7546d17630
15 changed files with 462 additions and 62 deletions
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31
crates/gba-core/tests/bios/ram_reset.rs
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@ -288,6 +288,37 @@ fn serial_sound_reset_flags_are_selective_and_all_devices_return() {
}
}
#[test]
fn serial_reset_clears_joybus_data_and_irq_enable_without_fabricating_a_master() {
use gba_core::io::{JOYCNT, JOYSTAT, JOY_RECV, JOY_TRANS, RCNT};
for thumb in [false, true] {
for flags in [0, 0x20, 0xff] {
let (mut m, pc) = prepare(flags, thumb, 0x1f);
m.memory_mut().write16(RCNT, 0xc100).unwrap();
m.memory_mut().write16(JOYCNT, 0x40).unwrap();
m.memory_mut().write32(JOY_RECV, MARKER).unwrap();
m.memory_mut().write32(JOY_TRANS, MARKER).unwrap();
m.memory_mut().write16(JOYSTAT, 0x30).unwrap();
complete(&mut m, pc);
let selected = flags & 0x20 != 0;
for address in [JOY_RECV, JOY_TRANS] {
assert_eq!(
m.memory().read32(address).unwrap(),
if selected { 0 } else { MARKER }
);
}
assert_eq!(
m.memory().read16(JOYCNT).unwrap(),
if selected { 0 } else { 0x40 }
);
// The replacement writes zero to TRANS, but does not write JOYSTAT.
// Pending data is not a completed transfer and cannot request an IRQ.
assert_eq!(m.memory().read16(JOYSTAT).unwrap(), 0x32);
assert_eq!(m.memory().read16(IF).unwrap() & 0x80, 0);
}
}
}
#[test]
fn serial_reset_cancels_an_external_clock_request_only_when_selected() {
use gba_core::io::{RCNT, SIOCNT};