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implementing low battery brownout protection to prevent contacts file corruption caused by low voltage reboot loop; board goes to sleep at 2800mv

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pelgraine
2026-03-01 23:28:49 +11:00
parent 4646fd6bd9
commit 4bb721e060
5 changed files with 61 additions and 4 deletions
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examples/companion_radio/DataStore.cpp
+32
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@@ -303,6 +303,38 @@ void DataStore::loadContacts(DataStoreHost* host) {
File file = openRead(fs, "/contacts3");
if (file) {
// --- Truncation guard ---
// If the file is smaller than one full contact record (152 bytes),
// it was truncated by a crash/brown-out. Discard it and try the
// .tmp backup if available.
size_t fsize = file.size();
if (fsize > 0 && fsize < 152) {
Serial.printf("DataStore: contacts3 truncated (%d bytes < 152), discarding\n", (int)fsize);
file.close();
fs->remove("/contacts3");
if (fs->exists("/contacts3.tmp")) {
File tmp = openRead(fs, "/contacts3.tmp");
if (tmp && tmp.size() >= 152) {
Serial.println("DataStore: recovering from .tmp after truncation");
tmp.close();
fs->rename("/contacts3.tmp", "/contacts3");
file = openRead(fs, "/contacts3");
if (!file) return; // give up
} else {
if (tmp) tmp.close();
Serial.println("DataStore: no valid contacts backup — starting fresh");
return;
}
} else {
Serial.println("DataStore: no .tmp backup — starting fresh");
return;
}
} else if (fsize == 0) {
// Empty file — nothing to load
file.close();
return;
}
bool full = false;
while (!full) {
ContactInfo c;