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M2 step 3: GNSS Service, with standby and the clock from a Fix

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The GNSS Service reads the receiver (UART 15/13, 115200, 1 KB buffer)
from its 50 ms tick and feeds the NMEA parser. With a Fix it sets the
clock (GNSS is the most trusted TimeSource) and refreshes it every 10
min. Settings gets GNSS On/Off and the coordinate format (Q64).

Off puts the receiver in standby with $PCAS12,65535, renewed hourly; On
wakes it with a hot start, $PCAS10,0. Both measured on the device: the
output stops within a second, and a command wakes it within a second.

Commands: gnss status (Fix, satellites per constellation, bytes and
sentences), gnss nmea on|off, gnss send <sentence>, gnss restart. The
probe is gone; never drive GPIO 15 (the receiver's output): the first
probe's swapped-pin attempt silenced it until a power cycle.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
This commit is contained in:
twisla
2026-10-04 22:26:53 +02:00
co-authored by Claude Opus 5.5
parent c9b1ecb772
commit 988253ef02
13 changed files with 257 additions and 32 deletions
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test/test_settings/test_settings.cpp
+2
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@@ -26,6 +26,8 @@ void test_defaults_when_store_is_empty() {
TEST_ASSERT_TRUE(s.getBool(Setting::Sound));
TEST_ASSERT_TRUE(s.getBool(Setting::ProbeMacRaw));
TEST_ASSERT_TRUE(s.getBool(Setting::WifiEnabled));
TEST_ASSERT_TRUE(s.getBool(Setting::GnssEnabled)); // Q58: on by default
TEST_ASSERT_FALSE(s.getBool(Setting::CoordinatesDms)); // Q64: decimal degrees
TEST_ASSERT_EQUAL_STRING("EU868", s.getString(Setting::Region).c_str());
TEST_ASSERT_EQUAL_STRING("CET-1CEST,M3.5.0,M10.5.0/3", s.getString(Setting::Timezone).c_str());
}