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diff --git a/GCC/AVR_Mega0/portmacro.h b/GCC/AVR_Mega0/portmacro.h
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+++ b/GCC/AVR_Mega0/portmacro.h
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+/*
+ * FreeRTOS Kernel <DEVELOPMENT BRANCH>
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+#define PORTMACRO_H
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/*-----------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the
+ * given hardware and compiler.
+ *
+ * These settings should not be altered.
+ *-----------------------------------------------------------
+ */
+
+/* Type definitions. */
+#define portCHAR                 char
+#define portFLOAT                float
+#define portDOUBLE               double
+#define portLONG                 long
+#define portSHORT                int
+#define portSTACK_TYPE           uint8_t
+#define portBASE_TYPE            char
+
+#define portPOINTER_SIZE_TYPE    uint16_t
+
+typedef portSTACK_TYPE   StackType_t;
+typedef signed char      BaseType_t;
+typedef unsigned char    UBaseType_t;
+
+#if ( configUSE_16_BIT_TICKS == 1 )
+    typedef uint16_t     TickType_t;
+    #define portMAX_DELAY    ( TickType_t ) 0xffff
+#else
+    typedef uint32_t     TickType_t;
+    #define portMAX_DELAY    ( TickType_t ) 0xffffffffUL
+#endif
+/*-----------------------------------------------------------*/
+
+/* Critical section management. */
+#define portENTER_CRITICAL()                     \
+    asm volatile ( "in __tmp_reg__, __SREG__" ); \
+    asm volatile ( "cli" );                      \
+    asm volatile ( "push __tmp_reg__" )
+
+#define portEXIT_CRITICAL()             \
+    asm volatile ( "pop __tmp_reg__" ); \
+    asm volatile ( "out __SREG__, __tmp_reg__" )
+
+#define portDISABLE_INTERRUPTS()    asm volatile ( "cli" ::);
+#define portENABLE_INTERRUPTS()     asm volatile ( "sei" ::);
+/*-----------------------------------------------------------*/
+
+/* Architecture specifics. */
+#define portSTACK_GROWTH      ( -1 )
+#define portTICK_PERIOD_MS    ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+#define portBYTE_ALIGNMENT    1
+#define portNOP()    asm volatile ( "nop" );
+/*-----------------------------------------------------------*/
+
+/* Kernel utilities. */
+extern void vPortYield( void ) __attribute__( ( naked ) );
+#define portYIELD()             vPortYield()
+
+extern void vPortYieldFromISR( void ) __attribute__( ( naked ) );
+#define portYIELD_FROM_ISR()    vPortYieldFromISR()
+/*-----------------------------------------------------------*/
+
+/* Task function macros as described on the FreeRTOS.org WEB site. */
+#define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+#define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* PORTMACRO_H */