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Simplify fractions, reverse bit order.

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Thomas Harte
2026-03-25 09:35:24 -04:00
parent 5b12ed3627
commit 41e2a03b60
1 changed files with 6 additions and 4 deletions
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Storage/Tape/Formats/K7.cpp
+6 -4
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@@ -45,6 +45,8 @@ static constexpr int BitsPerByte = 11;
Specifically, the ROM watches for an edge to synchronise, then waits for two thirds of the
bit length, then samples again to decide a 0 or a 1. And repeat.
There are not start and stop bits; bits are stored MSB first.
*/
K7::K7(const std::string &file_name) : file_name_(file_name) {}
@@ -110,8 +112,8 @@ void K7::Serialiser::push_next_pulses() {
};
const auto post = [&](const bool bit) {
static constexpr auto FullPulse = Time(833, 1'000'000); // 833 µs
static constexpr auto HalfPulse = Time(417, 1'000'000); // 417 µs
static constexpr auto FullPulse = Time(17, 20408); // ~833 µs.
static constexpr auto HalfPulse = Time(17, 40816); // ~417 µs.
if(bit) {
emplace_back(pulse_type(), HalfPulse);
@@ -123,8 +125,8 @@ void K7::Serialiser::push_next_pulses() {
uint8_t byte = file_.get();
for(int c = 0; c < 8; c++) {
post(byte & 1);
byte >>= 1;
post(byte & 0x80);
byte <<= 1;
}
}
}