diff --git a/arduino/beken-72xx/cores/arduino/SerialClass.cpp b/arduino/beken-72xx/cores/arduino/SerialClass.cpp
index b3dc584..121b2c0 100644
--- a/arduino/beken-72xx/cores/arduino/SerialClass.cpp
+++ b/arduino/beken-72xx/cores/arduino/SerialClass.cpp
@@ -26,7 +26,10 @@ SerialClass::SerialClass(uint8_t port) {
 
 static void callback(int port, void *param) {
 	RingBuffer *buf = (RingBuffer *)param;
-	buf->store_char(uart_read_byte(port));
+	int ch;
+	while ((ch = uart_read_byte(port)) != -1) {
+		buf->store_char(ch);
+	}
 }
 
 void SerialClass::begin(unsigned long baudrate, uint16_t config) {
diff --git a/platform/beken-7231n/config/sys_config.h b/platform/beken-7231n/config/sys_config.h
index 80a97a5..71df47e 100644
--- a/platform/beken-7231n/config/sys_config.h
+++ b/platform/beken-7231n/config/sys_config.h
@@ -129,4 +129,6 @@
 #define THD_UMP3_PRIORITY			  4
 #define THD_WPAS_PRIORITY			  5
 #define THDD_KEY_SCAN_PRIORITY		  7
+#define UART1_USE_FIFO_REC			  0
+#define UART2_USE_FIFO_REC			  0
 #define WIFI_DEFAULT_BLE_REQUEST	  1
diff --git a/platform/beken-7231t/config/sys_config.h b/platform/beken-7231t/config/sys_config.h
index 2d382f2..b114e5d 100644
--- a/platform/beken-7231t/config/sys_config.h
+++ b/platform/beken-7231t/config/sys_config.h
@@ -113,4 +113,6 @@
 #define THD_UMP3_PRIORITY				4
 #define THD_WPAS_PRIORITY				5
 #define THDD_KEY_SCAN_PRIORITY			7
+#define UART1_USE_FIFO_REC				0
+#define UART2_USE_FIFO_REC				0
 #define WIFI_DEFAULT_BLE_REQUEST		1