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Allow for increased number of reporting units, each having 2 seconds of air time and keeping frame within 60 seconds, evenly divided. Example: was 10, now 15, could be 20 or 30.

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This commit is contained in:
John Poole 2026-04-03 15:38:10 -07:00
commit 0395fed907
3 changed files with 33 additions and 5 deletions
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0
docs/gps.md Normal file
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3
exercises/12_FiveTalk/platformio.ini
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@ -28,6 +28,7 @@ build_flags =
-D GPS_WAKEUP_PIN=7
-D GPS_1PPS_PIN=6
-D GPS_L76K
-D NODE_SLOT_COUNT=7
-D LORA_CS=10
-D LORA_MOSI=11
-D LORA_SCK=12
@ -94,4 +95,6 @@ build_flags =
-D NODE_LABEL=\"Guy\"
-D NODE_SHORT=\"G\"
-D NODE_SLOT_INDEX=6
-D GPS_UBLOX

35
exercises/12_FiveTalk/src/main.cpp
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@ -27,6 +27,10 @@
#define NODE_SHORT "?"
#endif
#ifndef NODE_SLOT_COUNT
#define NODE_SLOT_COUNT 7
#endif
#ifndef NODE_SLOT_INDEX
#define NODE_SLOT_INDEX 0
#endif
@ -63,8 +67,8 @@
#define FW_BUILD_UTC "unknown"
#endif
#if (NODE_SLOT_INDEX < 0) || (NODE_SLOT_INDEX > 6)
#error "NODE_SLOT_INDEX must be 0..6"
#if (NODE_SLOT_INDEX < 0) || (NODE_SLOT_INDEX >= NODE_SLOT_COUNT)
#error "NODE_SLOT_INDEX must be 0..NODE_SLOT_COUNT-1"
#endif
static const uint32_t kSerialDelayMs = 1000;
@ -156,6 +160,20 @@ static uint8_t bestSatelliteCount()
return (g_gps.satsUsed > g_gps.satsInView) ? g_gps.satsUsed : g_gps.satsInView;
}
static uint32_t computeFrameSeconds(uint32_t requiredSeconds)
{
uint32_t frame = ((requiredSeconds + 4U) / 5U) * 5U; // round up to 5s
while (frame <= 60U && (60U % frame) != 0U)
{
frame += 5U;
}
if (frame == 0U || frame > 60U)
{
frame = 60U; // fallback
}
return frame;
}
static void logf(const char *fmt, ...)
{
char msg[256];
@ -1030,7 +1048,7 @@ static bool initRadio()
return false;
}
logf("Radio ready for %s (%s), slot=%d sec=%d", NODE_LABEL, NODE_SHORT, NODE_SLOT_INDEX, NODE_SLOT_INDEX * 2);
logf("Radio ready for %s (%s), slot=%d/%d (2s each)", NODE_LABEL, NODE_SHORT, NODE_SLOT_INDEX, NODE_SLOT_COUNT);
return true;
}
@ -1051,8 +1069,15 @@ static void runTxScheduler()
if (!getCurrentUtc(now, epoch))
return;
int slotSecond = NODE_SLOT_INDEX * (int)kSlotSeconds;
int secInFrame = now.second % 10;
uint32_t requiredTxSeconds = (uint32_t)NODE_SLOT_COUNT * kSlotSeconds;
uint32_t frameSeconds = computeFrameSeconds(requiredTxSeconds);
uint32_t slotSecond = (uint32_t)NODE_SLOT_INDEX * kSlotSeconds;
if (slotSecond >= frameSeconds)
return;
uint32_t secInFrame = (uint32_t)now.second % frameSeconds;
if (secInFrame >= requiredTxSeconds)
return; // idle guard interval
if (secInFrame != slotSecond)
return;