Fix issues in TCP QEMU Demo (#948)

* Fix issues in TCP QEMU Demo

* set the Ethernet interrupt priority

* Include CMSIS header files to fix build issues

* Review suggestion

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

---------

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
Co-authored-by: Gaurav Aggarwal <aggarg@amazon.com>

FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/CMSIS/CMSDK_CM3.h

@@ -103,7 +103,7 @@ typedef enum IRQn
 /* --------  Configuration of the Cortex-M3 Processor and Core Peripherals  ------- */
 #define __CM3_REV                 0x0201      /* Core revision r2p1                              */
 #define __MPU_PRESENT             1           /* MPU present or not                              */
-#define __NVIC_PRIO_BITS          3           /* Number of Bits used for Priority Levels         */
+#define __NVIC_PRIO_BITS          8           /* Number of Bits used for Priority Levels         */
 #define __Vendor_SysTickConfig    0           /* Set to 1 if different SysTick Config is used    */
 
 #include <core_cm3.h>                         /* Processor and core peripherals                  */

FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/FreeRTOSConfig.h

@@ -78,11 +78,11 @@ to exclude the API function. */
 #define INCLUDE_vTaskDelay              1
 
 
-#define configKERNEL_INTERRUPT_PRIORITY         252
+#define configKERNEL_INTERRUPT_PRIORITY         255
 /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
 See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
 #define configMAX_SYSCALL_INTERRUPT_PRIORITY    5 /* equivalent to 0xa0, or priority 5. */
-#define configMAC_INTERRUPT_PRIORITY 2
+#define configMAC_INTERRUPT_PRIORITY            5
 
 
 /* networking definitions */

FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/TCPEchoClient_SingleTasks.c

@@ -45,6 +45,8 @@
 #include "FreeRTOS.h"
 #include "task.h"
 #include "queue.h"
+#include "CMSIS/CMSDK_CM3.h"
+#include "CMSIS/core_cm3.h"
 
 /* FreeRTOS+TCP includes. */
 #include "FreeRTOS_IP.h"
@@ -108,6 +110,9 @@
     {
         BaseType_t x;
 
+        /* Set Ethernet interrupt priority to configMAC_INTERRUPT_PRIORITY. */
+        NVIC_SetPriority( ETHERNET_IRQn , configMAC_INTERRUPT_PRIORITY );
+
         /* Create the echo client tasks. */
         for( x = 0; x < echoNUM_ECHO_CLIENTS; x++ )
         {