diff --git a/app/drivers/sertrf/protocol/resend_protl.c b/app/drivers/sertrf/protocol/resend_protl.c
index 818aa7e..e13f415 100644
--- a/app/drivers/sertrf/protocol/resend_protl.c
+++ b/app/drivers/sertrf/protocol/resend_protl.c
@@ -82,14 +82,16 @@ int resend_decode(resend_device_t *resend_device, uint8_t c)
             resend_device->status.c_state = RESEND_RETRY_CNT;
             break;
         case RESEND_RETRY_CNT:
-            printf("cnt %d\r\n",c);
             resend_device->rx_frame.retry_cnt = c;
+            //超过最大允许重传次数
+            if(resend_device->rx_frame.retry_cnt > RESEND_MAX_RETRY_CNT)
+                resend_device->status.c_state = RESEND_IDLE;
             fmav_crc_accumulate(&frame_crc, c);
             resend_device->status.c_state = RESEND_LEN_1;
             break;
         case RESEND_LEN_1:
             resend_device->rx_frame.len = 0;
-            resend_device->rx_frame.len = (uint16_t)(c << 8) & 0xF0;
+            resend_device->rx_frame.len = (uint16_t)(c << 8);
             fmav_crc_accumulate(&frame_crc, c);
             resend_device->status.c_state = RESEND_LEN_2;
             break;
@@ -100,6 +102,9 @@ int resend_decode(resend_device_t *resend_device, uint8_t c)
             {
                 resend_device->status.data_offset = 0;
                 resend_device->status.c_state = RESEND_DATA;
+                //超过允许的字节数
+                if(resend_device->rx_frame.len > RESEND_DATA_SIZE)
+                    resend_device->status.c_state = RESEND_IDLE;
             }
             else
                 resend_device->status.c_state = RESEND_CRC_1;