From 6fde4bcc70bb31d6cefe3baaa1b9682ca6e5fbf1 Mon Sep 17 00:00:00 2001
From: lamauny <pub.elc@free.fr>
Date: Sun, 12 Oct 2025 18:46:29 +0200
Subject: [PATCH 1/2] [ln882h] improve flash read speed by changing baudrate

---
 ltchiptool/soc/ln882h/flash.py           |  5 +++--
 ltchiptool/soc/ln882h/util/ln882htool.py | 11 +++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/ltchiptool/soc/ln882h/flash.py b/ltchiptool/soc/ln882h/flash.py
index 95cb3be..beee7fc 100644
--- a/ltchiptool/soc/ln882h/flash.py
+++ b/ltchiptool/soc/ln882h/flash.py
@@ -14,8 +14,9 @@
     "Connect UART1 of the LN882h to the USB-TTL adapter:",
     [
         ("PC", "LN882h"),
-        ("RX", "TX1 (GPIOA2 / P2)"),
-        ("TX", "RX1 (GPIOA3 / P3)"),
+        ("RX", "TX0 (GPIOA2 / P2)"),
+        ("TX", "RX0 (GPIOA3 / P3)"),
+        ("GND", "BOOT (GPIOA9 / P9)"),
         ("", ""),
         ("GND", "GND"),
     ],
diff --git a/ltchiptool/soc/ln882h/util/ln882htool.py b/ltchiptool/soc/ln882h/util/ln882htool.py
index 99f5381..c038168 100644
--- a/ltchiptool/soc/ln882h/util/ln882htool.py
+++ b/ltchiptool/soc/ln882h/util/ln882htool.py
@@ -169,6 +169,7 @@ def flash_read(
         chunk_size: int = 256,  # maximum supported chunk size
     ) -> Generator[bytes, None, None]:
         self.link()
+        prev_baudrate = self.s.baudrate
         if not self.ramcode:
             self.ram_boot()
 
@@ -177,6 +178,10 @@ def flash_read(
                 f"Chunk size {chunk_size} exceeds the maximum allowed (256)"
             )
 
+        self.change_baudrate(LN882H_YM_BAUDRATE)
+        self.link()
+        self.push_timeout(0.02)
+
         for start in range(offset, offset + length, chunk_size):
             count = min(start + chunk_size, offset + length) - start
             debug(f"Dumping bytes: start=0x{start:X}, count=0x{count:X}")
@@ -186,10 +191,16 @@ def flash_read(
 
             valid, data = self.ym._verify_recv_checksum(True, data)
             if verify and not valid:
+                self.change_baudrate(prev_baudrate)
+                self.pop_timeout()
                 raise RuntimeError(f"Invalid checksum")
 
             yield data
 
+        self.change_baudrate(prev_baudrate)
+        self.pop_timeout()
+        info("Flash Read Successful.")
+
     def flash_write(
         self,
         offset: int,

From 9f018dc3b95f059e8942896c699825df5fc9b3a4 Mon Sep 17 00:00:00 2001
From: lamauny <pub.elc@free.fr>
Date: Sun, 12 Oct 2025 18:52:01 +0200
Subject: [PATCH 2/2] [ln882h] fix UART number in help tip

---
 ltchiptool/soc/ln882h/flash.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ltchiptool/soc/ln882h/flash.py b/ltchiptool/soc/ln882h/flash.py
index beee7fc..57b4fc6 100644
--- a/ltchiptool/soc/ln882h/flash.py
+++ b/ltchiptool/soc/ln882h/flash.py
@@ -11,7 +11,7 @@
 from .util.ln882htool import LN882hTool
 
 LN882H_GUIDE = [
-    "Connect UART1 of the LN882h to the USB-TTL adapter:",
+    "Connect UART0 of the LN882h to the USB-TTL adapter:",
     [
         ("PC", "LN882h"),
         ("RX", "TX0 (GPIOA2 / P2)"),