diff --git a/communication/src/main/java/cn/proxgrind/com/SppHasBlock.java b/communication/src/main/java/cn/proxgrind/com/SppHasBlock.java
index c09a64a2..864bf642 100644
--- a/communication/src/main/java/cn/proxgrind/com/SppHasBlock.java
+++ b/communication/src/main/java/cn/proxgrind/com/SppHasBlock.java
@@ -1,7 +1,11 @@
 package cn.proxgrind.com;
 
 import android.annotation.SuppressLint;
+import android.util.Log;
 
+import androidx.annotation.NonNull;
+
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 
@@ -33,6 +37,26 @@ public class SppHasBlock extends AbsBluetoothSpp {
 
     @Override
     public InputStream getInput() {
+        // return new InternalIn();
         return inputStream;
     }
+
+    /*class InternalIn extends InputStream {
+
+        @Override
+        public int read() throws IOException {
+            if (inputStream == null) return -1;
+            return inputStream.read();
+        }
+
+        @Override
+        public int read(@NonNull byte[] b, int off, int len) throws IOException {
+            if (inputStream == null) return -1;
+            int lenRecv = inputStream.available();
+            if (lenRecv <= 0) return -1;
+            Log.d("***", "长度：" + lenRecv);
+            return inputStream.read(b, off, lenRecv);
+            //Log.d("****", "接收: " + HexUtil.toHexString(recvMsg, offset, length));
+        }
+    }*/
 }
\ No newline at end of file
diff --git a/libnfc_pn53x/src/main/cpp/libnfc/buses/com_uart.c b/libnfc_pn53x/src/main/cpp/libnfc/buses/com_uart.c
index 095fe48e..f3d765d6 100644
--- a/libnfc_pn53x/src/main/cpp/libnfc/buses/com_uart.c
+++ b/libnfc_pn53x/src/main/cpp/libnfc/buses/com_uart.c
@@ -21,7 +21,7 @@ void c_close() {
 
 int c_read(uint8_t *pbtRx, size_t szRx, int timeout) {
     if (sp != INVALID_SERIAL_PORT) {
-        uart_reconfigure_timeouts(218);
+        uart_reconfigure_timeouts(388);
         size_t recvLen = 0;
         size_t *pRecvLen = &recvLen;
         if (uart_receive(sp, pbtRx, szRx, pRecvLen) == NFC_SUCCESS) {
@@ -35,7 +35,9 @@ int c_read(uint8_t *pbtRx, size_t szRx, int timeout) {
 int c_write(const uint8_t *pbtTx, size_t szTx, int timeout) {
     if (sp != INVALID_SERIAL_PORT) {
         uart_reconfigure_timeouts((uint32_t) timeout);
-        return uart_send(sp, pbtTx, szTx);
+        if (uart_send(sp, pbtTx, szTx) == NFC_SUCCESS) {
+            return szTx;
+        }
     }
     sp = INVALID_SERIAL_PORT;
     return -1;
diff --git a/libnfc_pn53x/src/main/cpp/libnfc/buses/uart_posix.c b/libnfc_pn53x/src/main/cpp/libnfc/buses/uart_posix.c
index 12475ae4..02e164e4 100644
--- a/libnfc_pn53x/src/main/cpp/libnfc/buses/uart_posix.c
+++ b/libnfc_pn53x/src/main/cpp/libnfc/buses/uart_posix.c
@@ -346,7 +346,8 @@ int uart_receive(const serial_port sp, uint8_t *pbtRx, uint32_t pszMaxRxLen, uin
         // Stop if the OS has some troubles reading the data
         if (res <= 0) {
             return NFC_EIO;
-        } else if (res > 0) {
+        } else if (res > 0 && pszMaxRxLen > 255) { // 只有USB通信下才有大于255个字节的通信请求
+            *pszRxLen += res;
             /*
              * TODO Look me!
              *
@@ -357,11 +358,10 @@ int uart_receive(const serial_port sp, uint8_t *pbtRx, uint32_t pszMaxRxLen, uin
              * so we need to return the data directly without waiting for enough 265 bytes.
              *
              * 这个UART实现是从PM3的开源库里拷贝过来的。
-             * PM3的通信过程跟LIBNFC的实现有非常大的区别（LIBNFC总是要求265个字节左右的数据），
+             * PM3的通信过程跟LIBNFC的实现有非常大的区别（LIBNFC某些驱动实现总是要求255个字节左右的数据），
              * 如果我们一直堵塞等待，将会导致程序非常缓慢，因此我们需要将数据直接返回，
-             * 而不等待足够的265个字节。
+             * 而不等待足够的255以上个字节。
              * */
-            *pszRxLen += res;
             return NFC_SUCCESS;
         }