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Attempt to deal with hours correctly.

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This commit is contained in:
Thomas Harte 2023-01-17 21:12:00 -05:00
parent 0951c50e40
commit 194b5bc36a
1 changed files with 37 additions and 4 deletions
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41
Components/RP5C01/RP5C01.cpp
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@ -100,6 +100,26 @@ constexpr int Reg(int mode, int address) {
return address | mode << 4;
}
constexpr int PM = 1 << 4;
constexpr int twenty_four_to_twelve(int hours) {
switch(hours) {
default: return (hours % 12) + (hours > 12 ? PM : 0);
case 0: return 12;
case 12: return 12 | PM;
}
}
constexpr int twelve_to_twenty_four(int hours) {
hours = (hours & 0xf) + (hours & PM ? 12 : 0);
switch(hours) {
default: break;
case 24: return 12;
case 12: return 0;
}
return hours;
}
}
/// Performs a write of @c value to @c address.
@ -117,7 +137,7 @@ void RP5C01::write(int address, uint8_t value) {
using SecondEncoder = Numeric::NumericCoder<
10, 6, // Seconds.
10, 6, // Minutes.
10, 3 // Hours
24 // Hours
>;
using TwoDigitEncoder = Numeric::NumericCoder<10, 10>;
@ -133,9 +153,22 @@ void RP5C01::write(int address, uint8_t value) {
case Reg(0, 0x03): SecondEncoder::encode<3>(seconds_, value); break;
// Hours.
// TODO: this isn't correct if the 12-hour clock is selected.
case Reg(0, 0x04): SecondEncoder::encode<4>(seconds_, value); break;
case Reg(0, 0x05): SecondEncoder::encode<5>(seconds_, value); break;
case Reg(0, 0x04):
case Reg(0, 0x05): {
int hours = SecondEncoder::decode<4>(seconds_);
if(!twentyfour_hour_clock_) {
hours = twenty_four_to_twelve(hours);
}
if(address == 0x4) {
hours = hours - (hours % 10) + value;
} else {
hours = (hours % 10) + ((value & 3) * 10);
}
if(!twentyfour_hour_clock_) {
hours = twelve_to_twenty_four(hours);
}
SecondEncoder::encode<4>(seconds_, hours);
} break;
// Day of the week.
case Reg(0, 0x06): day_of_the_week_ = value % 7; break;