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Timer tests

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This commit is contained in:
Franco Colmenarez 2021-11-23 09:21:25 -05:00
parent 23e7607319
commit 7fe522ea3b
1 changed files with 70 additions and 3 deletions
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73
src/timer.rs
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@ -31,6 +31,18 @@ impl Timer {
}
}
pub fn div(&self) -> u16 {
self.divider
}
pub fn set_div(&mut self, val: u16) {
self.divider = val;
}
pub fn prev_result(&self) -> bool {
self.prev_result
}
pub fn is_io_register(address: u16) -> bool {
address >= 0xFF04 && address <= 0xFF07
}
@ -45,10 +57,9 @@ impl Timer {
pub fn set_register(&mut self, address: u16, data: u8) {
if address == TIMER_DIVIDER_REGISTER_ADDRESS {
self.divider = 0;
self.io_registers[(TIMER_DIVIDER_REGISTER_ADDRESS - 0xFF04) as usize] = 0;
} else {
self.io_registers[(address - 0xFF04) as usize] = data;
return;
}
self.io_registers[(address - 0xFF04) as usize] = data;
}
pub fn get_interrupt(&self) -> bool {
@ -111,3 +122,59 @@ impl Timer {
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_tima_increment() {
let mut timer = Timer::new();
timer.set_register(TIMER_CONTROL_ADDRESS, 0b101);
timer.set_register(TIMER_COUNTER_ADDRESS, 0);
timer.set_div(0b10111);
timer.do_cycles(Cycles(1));
assert_eq!(timer.div(), 0b11000);
assert_eq!(timer.prev_result(), true);
assert_eq!(timer.get_register(TIMER_COUNTER_ADDRESS), 0);
assert_eq!(timer.get_interrupt(), false);
timer.do_cycles(Cycles(7));
assert_eq!(timer.div(), 0b11111);
assert_eq!(timer.prev_result(), true);
assert_eq!(timer.get_register(TIMER_COUNTER_ADDRESS), 0);
assert_eq!(timer.get_interrupt(), false);
timer.do_cycles(Cycles(1));
assert_eq!(timer.div(), 0b100000);
assert_eq!(timer.get_register(TIMER_COUNTER_ADDRESS), 1);
assert_eq!(timer.prev_result(), false);
assert_eq!(timer.get_interrupt(), false);
}
#[test]
fn test_tima_overflow() {
let mut timer = Timer::new();
timer.set_register(TIMER_CONTROL_ADDRESS, 0b101);
timer.set_register(TIMER_COUNTER_ADDRESS, 0xFF);
timer.set_div(0b10111);
timer.do_cycles(Cycles(9));
assert_eq!(timer.div(), 0b100000);
assert_eq!(timer.get_register(TIMER_COUNTER_ADDRESS), 0x00);
assert_eq!(timer.get_interrupt(), true);
}
#[test]
fn test_timer_enable() {
let mut timer = Timer::new();
timer.set_register(TIMER_CONTROL_ADDRESS, 0b101);
timer.set_register(TIMER_COUNTER_ADDRESS, 0);
timer.set_div(0b11000);
timer.do_cycles(Cycles(1));
assert_eq!(timer.div(), 0b11001);
assert_eq!(timer.get_register(TIMER_COUNTER_ADDRESS), 0);
timer.set_register(TIMER_CONTROL_ADDRESS, 0b001);
timer.do_cycles(Cycles(1));
assert_eq!(timer.div(), 0b11010);
assert_eq!(timer.get_register(TIMER_COUNTER_ADDRESS), 1);
}
}