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Start sketching out an RP5C01.

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This commit is contained in:
Thomas Harte 2023-01-14 14:17:28 -05:00
parent 3bc38d35c9
commit 48a4355592
3 changed files with 178 additions and 0 deletions
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100
Components/RP5C01/RP5C01.cpp Normal file
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//
// RP5C01.cpp
// Clock Signal
//
// Created by Thomas Harte on 14/01/2023.
// Copyright © 2023 Thomas Harte. All rights reserved.
//
#include "RP5C01.hpp"
using namespace Ricoh::RP5C01;
RP5C01::RP5C01(HalfCycles clock_rate) : clock_rate_(clock_rate) {}
void RP5C01::run_for(HalfCycles cycles) {
sub_seconds_ += cycles;
// Guess: this happens so rarely (i.e. once a second, ordinarily) that
// it's not worth worrying about the branch prediction consequences.
//
// ... and ditto all the conditionals below, which will be very rarely reached.
if(sub_seconds_ < clock_rate_) {
return;
}
const auto elapsed_seconds = int(sub_seconds_.as_integral() / clock_rate_.as_integral());
sub_seconds_ %= clock_rate_;
// Update time within day.
seconds_ += elapsed_seconds;
constexpr int day_length = 60 * 60 * 24;
if(seconds_ < day_length) {
return;
}
const int elapsed_days = seconds_ / day_length;
seconds_ %= day_length;
// Day of the week doesn't aggregate upwards.
day_of_the_week_ = (day_of_the_week_ + elapsed_days) % 7;
// Assumed for now: day and month run from 0.
// A leap year count of 0 implies a leap year.
// TODO: verify.
day_ += elapsed_days;
while(true) {
int month_length = 1;
switch(month_) {
case 0: month_length = 31; break;
case 1: month_length = 28 + !leap_year_; break;
case 2: month_length = 31; break;
case 3: month_length = 30; break;
case 4: month_length = 31; break;
case 5: month_length = 30; break;
case 6: month_length = 31; break;
case 7: month_length = 31; break;
case 8: month_length = 30; break;
case 9: month_length = 31; break;
case 10: month_length = 30; break;
case 11: month_length = 31; break;
}
if(day_ < month_length) {
return;
}
day_ -= month_length;
++month_;
if(month_ == 12) {
month_ = 0;
++year_;
leap_year_ = (leap_year_ + 1) & 3;
}
}
}
/// Performs a write of @c value to @c address.
void RP5C01::write(int address, uint8_t value) {
// Registers D–F don't depend on the mode.
if(address >= 0xd) {
switch(address) {
default: break;
case 0xd:
timer_enabled_ = value & 0x8;
alarm_enabled_ = value & 0x4;
mode_ = value & 0x3;
break;
case 0xe:
// Test register; unclear what is supposed to happen.
break;
case 0xf:
one_hz_on_ = !(value & 0x8);
sixteen_hz_on_ = !(value & 0x4);
// TODO: timer reset on bit 1, alarm reset on bit 0
break;
}
return;
}
}

62
Components/RP5C01/RP5C01.hpp Normal file
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@ -0,0 +1,62 @@
//
// RP5C01.hpp
// Clock Signal
//
// Created by Thomas Harte on 14/01/2023.
// Copyright © 2023 Thomas Harte. All rights reserved.
//
#ifndef RP5C01_hpp
#define RP5C01_hpp
#include "../../ClockReceiver/ClockReceiver.hpp"
#include <array>
#include <cstdint>
namespace Ricoh {
namespace RP5C01 {
class RP5C01 {
public:
RP5C01(HalfCycles clock_rate);
/// @returns the result of a read from @c address.
uint8_t read(int address);
/// Performs a write of @c value to @c address.
void write(int address, uint8_t value);
/// Advances time.
void run_for(HalfCycles);
private:
std::array<uint8_t, 26> ram_;
HalfCycles sub_seconds_;
const HalfCycles clock_rate_;
// Contains the seconds, minutes and hours fields.
int seconds_ = 0;
// Calendar entries.
int day_of_the_week_ = 0;
int day_ = 0;
int month_ = 0;
int year_ = 1988;
int leap_year_ = 0;
// Other flags.
bool timer_enabled_ = false;
bool alarm_enabled_ = false;
int mode_ = 0;
bool one_hz_on_ = false;
bool sixteen_hz_on_ = false;
};
}
}
#include <stdio.h>
#endif /* RP5C01_hpp */

16
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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