From 377be3a2bd1a5e57e59af2239b5e620135e827e4 Mon Sep 17 00:00:00 2001
From: kai-morich <mail@kai-morich.de>
Date: Sun, 4 Oct 2026 20:16:51 +0200
Subject: [PATCH] CH34x: for baud rate 307200 use special divisor+factor with
 lower deviation

---
 .idea/markdown.xml                                        | 8 ++++++++
 .../hoho/android/usbserial/driver/Ch34xSerialDriver.java  | 3 +++
 2 files changed, 11 insertions(+)
 create mode 100644 .idea/markdown.xml

diff --git a/.idea/markdown.xml b/.idea/markdown.xml
new file mode 100644
index 0000000..c61ea33
--- /dev/null
+++ b/.idea/markdown.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java b/usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java
index 8d02001..602e22e 100644
--- a/usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java
+++ b/usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java
@@ -199,6 +199,9 @@ public class Ch34xSerialDriver implements UsbSerialDriver {
             if (baudRate == 921600) {
                 divisor = 7;
                 factor = 0xf300;
+            } else if (baudRate == 307200) {
+                divisor = 7;
+                factor = 0xd900;
             } else {
                 final long BAUDBASE_FACTOR = 1532620800;
                 final int BAUDBASE_DIVMAX = 3;