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pureboot: the detail reaches become the library's own API

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The three things this repo took from under libavr's counter are now over
it, and the local copies fold away. The USART release on a software
link's pins is the library's init contract (its guard here becomes a
deletion, byte-identical images held by the gate); the WDRF routing test
is power::peek_reset_cause().watchdog instead of a hand lookup of the
flag's register; the tsb tiers' baud arithmetic is the public solver.
libavr pin advances over those three additions.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-07-28 16:12:35 +02:00
parent c535c4756c
commit a3ea099105
5 changed files with 5 additions and 35 deletions
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2
tsb/tsb_asm.cpp
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@@ -65,7 +65,7 @@ constexpr std::uint8_t comm_window = 200;
constexpr std::uint16_t build_date = 26 * 512 + 7 * 32 + 20;
// Fixed 115200 8N1; the library solves UBRR + U2X from clock and baud.
constexpr auto baud = avr::uart::detail::solve_baud(16_MHz, 115200_Bd);
constexpr auto baud = avr::uart::solve_baud(16_MHz, 115200_Bd);
// The 16-byte device-info block, streamed out on activation.
// clang-format off

2
tsb/tsb_policy.cpp
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@@ -200,7 +200,7 @@ extern "C" [[noreturn]] void tsb_app(); // the application's reset vector: --def
// only the divisor low byte and U2X0 need a store. The solver still does
// the datasheet work; the asserts pin the reset-state assumptions.
{
constexpr auto sol = avr::uart::detail::solve_baud(dev::clock, 115200_Bd);
constexpr auto sol = avr::uart::solve_baud(dev::clock, 115200_Bd);
static_assert(sol.u2x && sol.ubrr < 256, "lean bring-up writes UBRR0L only, with U2X0");
avr::hw::reg<"UBRR0">::write(static_cast<std::uint8_t>(sol.ubrr));
avr::hw::ucsr0a::write(avr::hw::ucsr0a::u2x0(1));

2
tsb/tsb_tricks.cpp
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@@ -65,7 +65,7 @@ constexpr std::uint8_t comm_window = 200;
constexpr std::uint16_t build_date = 26 * 512 + 7 * 32 + 20;
// Fixed 115200 8N1; the library solves UBRR + U2X from clock and baud.
constexpr auto baud = avr::uart::detail::solve_baud(16_MHz, 115200_Bd);
constexpr auto baud = avr::uart::solve_baud(16_MHz, 115200_Bd);
// The 16-byte device-info block, streamed out on activation.
// clang-format off