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fix: prevent Serial.printf from blocking when USB disconnected
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On ESP32-C3 with USB CDC, Serial.printf() blocks indefinitely when USB
is not connected. This caused device freezes when booted without USB.

Solution: Call Serial.setTxTimeoutMs(0) after Serial.begin() to make
all Serial output non-blocking.

Also added if (Serial) guards to high-traffic logging paths in
EpubReaderActivity as belt-and-suspenders protection.

Includes documentation of the debugging process and Serial call inventory.

Also applies clang-format to fix pre-existing formatting issues.
This commit is contained in:
cottongin
2026-01-28 15:57:31 -05:00
parent f3075002c1
commit 4db384edb6
59 changed files with 989 additions and 621 deletions
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6
src/activities/browser/OpdsBookBrowserActivity.cpp
View File

@@ -236,7 +236,8 @@ void OpdsBookBrowserActivity::render() const {
}
const auto pageStartIndex = selectorIndex / PAGE_ITEMS * PAGE_ITEMS;
renderer.fillRect(bezelLeft, 60 + bezelTop + (selectorIndex % PAGE_ITEMS) * 30 - 2, pageWidth - 1 - bezelLeft - bezelRight, 30);
renderer.fillRect(bezelLeft, 60 + bezelTop + (selectorIndex % PAGE_ITEMS) * 30 - 2,
pageWidth - 1 - bezelLeft - bezelRight, 30);
for (size_t i = pageStartIndex; i < entries.size() && i < static_cast<size_t>(pageStartIndex + PAGE_ITEMS); i++) {
const auto& entry = entries[i];
@@ -253,7 +254,8 @@ void OpdsBookBrowserActivity::render() const {
}
}
auto item = renderer.truncatedText(UI_10_FONT_ID, displayText.c_str(), renderer.getScreenWidth() - 40 - bezelLeft - bezelRight);
auto item = renderer.truncatedText(UI_10_FONT_ID, displayText.c_str(),
renderer.getScreenWidth() - 40 - bezelLeft - bezelRight);
renderer.drawText(UI_10_FONT_ID, 20 + bezelLeft, 60 + bezelTop + (i % PAGE_ITEMS) * 30, item.c_str(),
i != static_cast<size_t>(selectorIndex));
}