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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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8
lib/Txt/Txt.cpp
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@@ -205,8 +205,8 @@ bool Txt::generateThumbBmp() const {
}
constexpr int THUMB_TARGET_WIDTH = 240;
constexpr int THUMB_TARGET_HEIGHT = 400;
const bool success =
JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(coverJpg, thumbBmp, THUMB_TARGET_WIDTH, THUMB_TARGET_HEIGHT);
const bool success = JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(coverJpg, thumbBmp, THUMB_TARGET_WIDTH,
THUMB_TARGET_HEIGHT);
coverJpg.close();
thumbBmp.close();
@@ -276,8 +276,8 @@ bool Txt::generateMicroThumbBmp() const {
}
constexpr int MICRO_THUMB_TARGET_WIDTH = 45;
constexpr int MICRO_THUMB_TARGET_HEIGHT = 60;
const bool success = JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(coverJpg, microThumbBmp,
MICRO_THUMB_TARGET_WIDTH, MICRO_THUMB_TARGET_HEIGHT);
const bool success = JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(
coverJpg, microThumbBmp, MICRO_THUMB_TARGET_WIDTH, MICRO_THUMB_TARGET_HEIGHT);
coverJpg.close();
microThumbBmp.close();