diff --git a/components/free_rtos/base/swap.h b/components/free_rtos/base/swap.h
index 800f90e..1827509 100644
--- a/components/free_rtos/base/swap.h
+++ b/components/free_rtos/base/swap.h
@@ -8,8 +8,12 @@
 #ifndef FREE_RTOS_BASE_SWAP_H_
 #define FREE_RTOS_BASE_SWAP_H_
 
-#define BASE_SWAP32(value) __builtin_bswap32(value)
+#include <arm_acle.h>
 
-#define BASE_SWAP16(value) (uint16_t)__builtin_bswap16(value)
+//#define BASE_SWAP32(value) __builtin_bswap32(value)
+#define BASE_SWAP32(value) __rev(value)
+
+//#define BASE_SWAP16(value) (uint16_t)__builtin_bswap16(value)
+#define BASE_SWAP16(value) (uint16_t)__rev16(value)
 
 #endif /* FREE_RTOS_BASE_SWAP_H_ */
diff --git a/components/free_rtos/ethernet_ip/eth_checksum.c b/components/free_rtos/ethernet_ip/eth_checksum.c
index a434035..1feb666 100644
--- a/components/free_rtos/ethernet_ip/eth_checksum.c
+++ b/components/free_rtos/ethernet_ip/eth_checksum.c
@@ -7,6 +7,8 @@
 #include "free_rtos/ethernet_ip/eth_checksum.h"
 #include "free_rtos/base/swap.h"
 
+#include <arm_acle.h>
+
 uint16_t eth_calcChksum(uint32_t sum, uint8_t * const data, uint16_t len)
 {
     uint16_t i;
@@ -54,44 +56,74 @@ uint16_t eth_calcChksum2(uint32_t sum, uint8_t * const hdata, uint16_t hlen, uin
     return ~sum;
 }
 
-inline uint32_t calcSum(void * buffer, uint32_t sum, void * const data, uint16_t len) {
-    uint32_t * buffer_start32 = (uint32_t*)buffer;
-    uint32_t * data_start32 = (uint32_t*)data;
-    uint32_t * data_end32 = data_start32 + len/sizeof(uint32_t);
-    uint32_t remainder = len%sizeof(uint32_t);
-    uint32_t value;
+union PointerConverter
+{
+    void * unknown;
+    uint64_t * octet;
+    uint32_t * quartet;
+    uint16_t * duet;
+    uint8_t * solo;
+};
 
-    while(data_start32 < data_end32) {
-        value = *data_start32++;
-        *buffer_start32++ = value;
-        value = __rev16(value);
-        sum += (value&0xFFFF) + (value>>16);
+struct Array {
+    uint16_t duet0;
+    uint16_t duet1;
+    uint16_t duet2;
+    uint16_t duet3;
+};
+
+union ValueConverter
+{
+    uint64_t octet;
+    uint32_t quartet;
+    uint16_t duet;
+    uint8_t solo;
+    struct Array array;
+};
+
+uint32_t calcSum(void * const buffer, uint32_t sum, void * const data, uint16_t len)
+{
+    union PointerConverter buffer_start;
+    union PointerConverter data_start;
+    union ValueConverter value;
+
+    buffer_start.unknown = buffer;
+    data_start.unknown = data;
+
+    while(len >= sizeof(uint32_t)) {
+        len -= sizeof(uint32_t);
+
+        value.quartet = *data_start.quartet++;
+        *buffer_start.quartet++ = value.quartet;
+
+        value.quartet = __rev16(value.quartet);
+        sum += value.array.duet0 + value.array.duet1;
     }
 
-    uint16_t * buffer_start16 = (uint16_t*)buffer_start32;
-    uint16_t * data_start16 = (uint16_t*)data_start32;
+    if(len >= sizeof(uint16_t)) {
+        len -= sizeof(uint16_t);
 
-    if(remainder > 1) {
-        value = *data_start16++;
-        *buffer_start16++ = value;
-        value = __rev16(value);
-        sum += value;
+        value.duet = *data_start.duet++;
+        *buffer_start.duet++ = value.duet;
+
+        value.quartet = __rev16(value.quartet);
+        sum += value.duet;
     }
 
-    uint8_t * buffer_start8 = (uint8_t*)buffer_start16;
-    uint8_t * data_start8 = (uint8_t*)data_start16;
+    if(len >= sizeof(uint8_t)) {
+        len -= sizeof(uint8_t);
 
-    if(remainder == 1) {
-        value = *data_start8++;
-        *buffer_start8++ = value;
-        value = __rev16(value);
-        sum += value;
+        value.solo = *data_start.solo++;
+        *buffer_start.solo++ = value.solo;
+
+        value.quartet = __rev16(value.quartet);
+        sum += value.solo;
     }
 
     return sum;
 }
 
-uint16_t eth_calcChksum3(void * buffer, uint32_t sum, void * const hdata, uint16_t hlen, void * const data, uint16_t len)
+uint16_t eth_calcChksum3(void * const buffer, uint32_t sum, void * const hdata, uint16_t hlen, void * const data, uint16_t len)
 {
     if(hdata != 0) {
         sum = calcSum(buffer, sum, hdata, hlen);
diff --git a/components/free_rtos/ethernet_ip/eth_checksum.h b/components/free_rtos/ethernet_ip/eth_checksum.h
index b861c69..0d5cd31 100644
--- a/components/free_rtos/ethernet_ip/eth_checksum.h
+++ b/components/free_rtos/ethernet_ip/eth_checksum.h
@@ -16,7 +16,7 @@ extern "C" {
 
 uint16_t eth_calcChksum(uint32_t sum, uint8_t * const data, uint16_t len);
 uint16_t eth_calcChksum2(uint32_t sum, uint8_t * const hdata, uint16_t hlen, uint8_t * const data, uint16_t len);
-uint16_t eth_calcChksum3(void * buffer, uint32_t sum, void * const hdata, uint16_t hlen, void * const data, uint16_t len);
+uint16_t eth_calcChksum3(void * const buffer, uint32_t sum, void * const hdata, uint16_t hlen, void * const data, uint16_t len);
 
 #ifdef __cplusplus
 }
diff --git a/components/free_rtos/ethernet_ip/eth_udp_client.hpp b/components/free_rtos/ethernet_ip/eth_udp_client.hpp
index f94bdb8..845867b 100644
--- a/components/free_rtos/ethernet_ip/eth_udp_client.hpp
+++ b/components/free_rtos/ethernet_ip/eth_udp_client.hpp
@@ -61,7 +61,7 @@ public:
             return 0;
         }
 
-        if (buff_[toggle_].size() == 0) {
+        if (buff_[out_toggle_].size() == 0) {
             if(capture_buffer() == false) {
                 return 0;
             }