6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-11-22 12:33:29 +00:00
Code Issues Projects Releases Wiki Activity

Implement most of reading.

Browse Source
This commit is contained in:
Thomas Harte 2023-01-16 22:25:20 -05:00
parent f0db676a10
commit 55e73cb812
2 changed files with 90 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

98
Components/RP5C01/RP5C01.cpp
View File

@ -160,8 +160,9 @@ void RP5C01::write(int address, uint8_t value) {
case Reg(1, 0x07):
case Reg(1, 0x08): break;
// TODO: 12/24 hour select.
case Reg(1, 0x0a): break;
case Reg(1, 0x0a):
twentyfour_hour_clock_ = value & 1;
break;
// TODO: leap-year counter.
case Reg(1, 0x0b): break;
@ -190,17 +191,92 @@ void RP5C01::write(int address, uint8_t value) {
uint8_t RP5C01::read(int address) {
address &= 0xf;
if(address < 0xd) {
switch(mode_) {
case 3:
address += 13;
[[fallthrough]];
case 2:
if(address < 0xd && mode_ >= 2) {
address += mode_ == 3 ? 13 : 0;
return 0xf0 | ram_[size_t(address)];
}
int value = 0xf;
switch(Reg(mode_, address)) {
// Second.
case Reg(0, 0x00): value = seconds_ % 10; break;
case Reg(0, 0x01): value = (seconds_ / 10) % 6; break;
// Minute.
case Reg(0, 0x02): value = (seconds_ / 60) % 10; break;
case Reg(0, 0x03): value = (seconds_ / 600) % 6; break;
// Hour.
case Reg(0, 0x04):
if(twentyfour_hour_clock_) {
value = (seconds_ / 3600) % 10;
} else {
value = ((seconds_ / 3600) % 12) % 10;
}
break;
case Reg(0, 0x05):
if(twentyfour_hour_clock_) {
value = (seconds_ / 36000);
} else {
value = ((seconds_ / 3600) / 12) + (seconds_ >= 12*60*60 ? 2 : 0);
}
break;
// Day-of-the-week.
case Reg(0, 0x06): value = day_of_the_week_; break;
// Day.
case Reg(0, 0x07): value = day_ % 10; break;
case Reg(0, 0x08): value = day_ / 10; break;
// Month.
case Reg(0, 0x09): value = month_ % 10; break;
case Reg(0, 0x0a): value = month_ / 10; break;
// Year;
case Reg(0, 0x0b): value = year_ % 10; break;
case Reg(0, 0x0c): value = year_ / 10; break;
// TODO: alarm minutes.
case Reg(1, 0x02):
case Reg(1, 0x03): break;
// TODO: alarm hours.
case Reg(1, 0x04):
case Reg(1, 0x05): break;
// TODO: alarm day-of-the-week.
case Reg(1, 0x06): break;
// TODO: alarm day.
case Reg(1, 0x07):
case Reg(1, 0x08): break;
// 12/24-hour clock.
case Reg(1, 0x0a): value = twentyfour_hour_clock_; break;
// Leap year.
case Reg(1, 0x0b): value = leap_year_; break;
//
// Registers D–F don't depend on the mode.
//
case Reg(0, 0xd): case Reg(1, 0xd): case Reg(2, 0xd): case Reg(3, 0xd):
value =
(timer_enabled_ ? 0x8 : 0x0) |
(alarm_enabled_ ? 0x4 : 0x0) |
mode_;
break;
case Reg(0, 0xe): case Reg(1, 0xe): case Reg(2, 0xe): case Reg(3, 0xe):
// Test register; unclear what is supposed to happen.
break;
case Reg(0, 0xf): case Reg(1, 0xf): case Reg(2, 0xf): case Reg(3, 0xf):
value =
(one_hz_on_ ? 0x0 : 0x8) |
(sixteen_hz_on_ ? 0x0 : 0x4);
break;
}
// TODO.
printf("RP-5C01 read from %d in mode %d\n", address & 0xf, mode_);
return 0xff;
return uint8_t(0xf0 | value);
}

1
Components/RP5C01/RP5C01.hpp
View File

@ -52,6 +52,7 @@ class RP5C01 {
int mode_ = 0;
bool one_hz_on_ = false;
bool sixteen_hz_on_ = false;
bool twentyfour_hour_clock_ = true;
};
}