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Improves test slightly, and fixes line interrupt reload value setting.

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This commit is contained in:
Thomas Harte 2018-10-09 22:14:35 -04:00
parent c128ddb549
commit acdc84e08c
2 changed files with 22 additions and 5 deletions
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10
Components/9918/9918.cpp
View File

@ -486,7 +486,7 @@ void TMS9918::set_register(int address, uint8_t value) {
case 10:
if(is_sega_vdp(personality_)) {
line_interrupt_target = value;
line_interrupt_target = low_write_;
}
break;
@ -559,8 +559,12 @@ uint8_t TMS9918::get_register(int address) {
return generate_interrupts_ ? time_until_frame_interrupt : HalfCycles(-1);
}
// Figure out the number of internal cycles until the next line interrupt.
int local_cycles_until_line_interrupt = ((mode_timing_.line_interrupt_position - column_ + 342) % 342) + (next_line_interrupt_row - row_) * 342;
// Figure out the number of internal cycles until the next line interrupt, which is the amount
// of time to the next tick over and then next_line_interrupt_row - row_ lines further.
int local_cycles_until_next_tick = (mode_timing_.line_interrupt_position - column_ + 342) % 342;
if(!local_cycles_until_next_tick) local_cycles_until_next_tick += 342;
int local_cycles_until_line_interrupt = local_cycles_until_next_tick + (next_line_interrupt_row - row_) * 342;
local_cycles_until_line_interrupt <<= 2;
local_cycles_until_line_interrupt -= cycles_error_;

17
OSBindings/Mac/Clock SignalTests/MasterSystemVDPTests.mm
View File

@ -59,11 +59,24 @@
// Check interrupt flag isn't set prior to the reported time.
vdp.run_for(HalfCycles(time_until_interrupt));
NSAssert(!vdp.get_interrupt_line(), @"Interrupt line went active early");
NSAssert(!vdp.get_interrupt_line(), @"Interrupt line went active early [1]");
// Check interrupt flag is set at the reported time.
vdp.run_for(HalfCycles(1));
NSAssert(vdp.get_interrupt_line(), @"Interrupt line wasn't set when promised");
NSAssert(vdp.get_interrupt_line(), @"Interrupt line wasn't set when promised [1]");
// Read the status register to clear interrupt status.
vdp.get_register(1);
NSAssert(!vdp.get_interrupt_line(), @"Interrupt wasn't reset by status read");
// Check interrupt flag isn't set prior to the reported time.
time_until_interrupt = vdp.get_time_until_interrupt().as_int() - 1;
vdp.run_for(HalfCycles(time_until_interrupt));
NSAssert(!vdp.get_interrupt_line(), @"Interrupt line went active early [2]");
// Check interrupt flag is set at the reported time.
vdp.run_for(HalfCycles(1));
NSAssert(vdp.get_interrupt_line(), @"Interrupt line wasn't set when promised [2]");
}
@end