diff --git a/portable/GCC/AVR_AVRDx/port.c b/portable/GCC/AVR_AVRDx/port.c
new file mode 100644
index 0000000..8fca329
--- /dev/null
+++ b/portable/GCC/AVR_AVRDx/port.c
@@ -0,0 +1,350 @@
+/*
+ * FreeRTOS Kernel V10.0.0
+ * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * 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. If you wish to use our Amazon
+ * FreeRTOS name, please do so in a fair use way that does not cause confusion.
+ *
+ * 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.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+#include <stdlib.h>
+
+#include <avr/interrupt.h>
+#include "porthardware.h"
+#include "FreeRTOS.h"
+#include "task.h"
+
+/*-----------------------------------------------------------
+ * Implementation of functions defined in portable.h for the AVR port.
+ *----------------------------------------------------------*/
+
+/* Start tasks with interrupts enables. */
+#define portFLAGS_INT_ENABLED				((StackType_t) 0x80)
+
+/*-----------------------------------------------------------*/
+
+/* We require the address of the pxCurrentTCB variable, but don't want to know
+any details of its type. */
+typedef void RTOS_TCB_t;
+extern volatile RTOS_TCB_t *volatile pxCurrentTCB;
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Macro to save all the general purpose registers, the save the stack pointer
+ * into the TCB.
+ *
+ * The first thing we do is save the flags then disable interrupts.  This is to
+ * guard our stack against having a context switch interrupt after we have already
+ * pushed the registers onto the stack - causing the 32 registers to be on the
+ * stack twice.
+ *
+ * r1 is set to zero as the compiler expects it to be thus, however some
+ * of the math routines make use of R1.
+ *
+ * The interrupts will have been disabled during the call to portSAVE_CONTEXT()
+ * so we need not worry about reading/writing to the stack pointer.
+
+ */
+
+#define portSAVE_CONTEXT()	\
+	asm volatile("push	r0						\n\t"	\
+	             "in	r0, __SREG__			\n\t"	\
+	             "cli							\n\t"	\
+	             "push	r0						\n\t"	\
+                 "in    r0, __RAMPZ__           \n\t"   \
+                 "push  r0                      \n\t"   \
+	             "push	r1						\n\t"	\
+	             "clr	r1						\n\t"	\
+	             "push	r2						\n\t"	\
+	             "push	r3						\n\t"	\
+	             "push	r4						\n\t"	\
+	             "push	r5						\n\t"	\
+	             "push	r6						\n\t"	\
+	             "push	r7						\n\t"	\
+	             "push	r8						\n\t"	\
+	             "push	r9						\n\t"	\
+	             "push	r10						\n\t"	\
+	             "push	r11						\n\t"	\
+	             "push	r12						\n\t"	\
+	             "push	r13						\n\t"	\
+	             "push	r14						\n\t"	\
+	             "push	r15						\n\t"	\
+	             "push	r16						\n\t"	\
+	             "push	r17						\n\t"	\
+	             "push	r18						\n\t"	\
+	             "push	r19						\n\t"	\
+	             "push	r20						\n\t"	\
+	             "push	r21						\n\t"	\
+	             "push	r22						\n\t"	\
+	             "push	r23						\n\t"	\
+	             "push	r24						\n\t"	\
+	             "push	r25						\n\t"	\
+	             "push	r26						\n\t"	\
+	             "push	r27						\n\t"	\
+	             "push	r28						\n\t"	\
+	             "push	r29						\n\t"	\
+	             "push	r30						\n\t"	\
+	             "push	r31						\n\t"	\
+	             "lds	r26, pxCurrentTCB		\n\t"	\
+	             "lds	r27, pxCurrentTCB + 1	\n\t"	\
+	             "in	r0, __SP_L__			\n\t"	\
+	             "st	x+, r0					\n\t"	\
+	             "in	r0, __SP_H__			\n\t"	\
+	             "st	x+, r0					\n\t");
+
+/*
+ * Opposite to portSAVE_CONTEXT().  Interrupts will have been disabled during
+ * the context save so we can write to the stack pointer.
+ */
+
+#define portRESTORE_CONTEXT()	\
+	asm volatile("lds	r26, pxCurrentTCB		\n\t"	\
+	             "lds	r27, pxCurrentTCB + 1	\n\t"	\
+	             "ld	r28, x+					\n\t"	\
+	             "out	__SP_L__, r28			\n\t"	\
+	             "ld	r29, x+					\n\t"	\
+	             "out	__SP_H__, r29			\n\t"	\
+	             "pop	r31						\n\t"	\
+	             "pop	r30						\n\t"	\
+	             "pop	r29						\n\t"	\
+	             "pop	r28						\n\t"	\
+	             "pop	r27						\n\t"	\
+	             "pop	r26						\n\t"	\
+	             "pop	r25						\n\t"	\
+	             "pop	r24						\n\t"	\
+	             "pop	r23						\n\t"	\
+	             "pop	r22						\n\t"	\
+	             "pop	r21						\n\t"	\
+	             "pop	r20						\n\t"	\
+	             "pop	r19						\n\t"	\
+	             "pop	r18						\n\t"	\
+	             "pop	r17						\n\t"	\
+	             "pop	r16						\n\t"	\
+	             "pop	r15						\n\t"	\
+	             "pop	r14						\n\t"	\
+	             "pop	r13						\n\t"	\
+	             "pop	r12						\n\t"	\
+	             "pop	r11						\n\t"	\
+	             "pop	r10						\n\t"	\
+	             "pop	r9						\n\t"	\
+	             "pop	r8						\n\t"	\
+	             "pop	r7						\n\t"	\
+	             "pop	r6						\n\t"	\
+	             "pop	r5						\n\t"	\
+	             "pop	r4						\n\t"	\
+	             "pop	r3						\n\t"	\
+	             "pop	r2						\n\t"	\
+	             "pop	r1						\n\t"	\
+                 "pop   r0                      \n\t"	\
+                 "out   __RAMPZ__, r0           \n\t"	\
+	             "pop	r0						\n\t"	\
+	             "out	__SREG__, r0			\n\t"	\
+	             "pop	r0						\n\t");
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Perform hardware setup to enable ticks from timer.
+ */
+static void prvSetupTimerInterrupt(void);
+/*-----------------------------------------------------------*/
+
+/*
+ * See header file for description.
+ */
+StackType_t *pxPortInitialiseStack(StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters)
+{
+	uint16_t usAddress;
+
+	/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
+
+	/* Place a few bytes of known values on the bottom of the stack.
+    This is just useful for debugging. Uncomment if needed. */
+    // *pxTopOfStack = 0x11;
+    // pxTopOfStack--;
+    // *pxTopOfStack = 0x22;
+    // pxTopOfStack--;
+    // *pxTopOfStack = 0x33; 
+    // pxTopOfStack--;
+
+	/* The start of the task code will be popped off the stack last, so place
+	it on first. */
+	usAddress     = (uint16_t)pxCode;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+	pxTopOfStack--;
+
+	usAddress >>= 8;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+	pxTopOfStack--;
+
+	/* Next simulate the stack as if after a call to portSAVE_CONTEXT().
+	portSAVE_CONTEXT places the flags on the stack immediately after r0
+	to ensure the interrupts get disabled as soon as possible, and so ensuring
+	the stack use is minimal should a context switch interrupt occur. */
+	*pxTopOfStack = (StackType_t)0x00; /* R0 */
+	pxTopOfStack--;
+	*pxTopOfStack = portFLAGS_INT_ENABLED;
+	pxTopOfStack--;
+	*pxTopOfStack = ( StackType_t ) 0x00;	/* RAMPZ */
+	pxTopOfStack--;
+	
+	/* Now the remaining registers.   The compiler expects R1 to be 0. */
+	*pxTopOfStack = (StackType_t)0x00; /* R1 */
+
+	/* Leave R2 - R23 untouched */
+	pxTopOfStack -= 23;
+
+	/* Place the parameter on the stack in the expected location. */
+	usAddress     = (uint16_t)pvParameters;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+	pxTopOfStack--;
+
+	usAddress >>= 8;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+
+	/* Leave register R26 - R31 untouched */
+	pxTopOfStack -= 7;
+
+	/*lint +e950 +e611 +e923 */
+
+	return pxTopOfStack;
+}
+/*-----------------------------------------------------------*/
+
+BaseType_t xPortStartScheduler(void)
+{
+	/* Setup the hardware to generate the tick. */
+	prvSetupTimerInterrupt();
+
+	/* Restore the context of the first task that is going to run. */
+	portRESTORE_CONTEXT();
+
+	/* Simulate a function call end as generated by the compiler.  We will now
+	jump to the start of the task the context of which we have just restored. */
+	asm volatile("ret");
+
+	/* Should not get here. */
+	return pdTRUE;
+}
+/*-----------------------------------------------------------*/
+
+void vPortEndScheduler(void)
+{
+	/* vPortEndScheduler is not implemented in this port. */
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Manual context switch.  The first thing we do is save the registers so we
+ * can use a naked attribute.
+ */
+void vPortYield(void) __attribute__((naked));
+void vPortYield(void)
+{
+	portSAVE_CONTEXT();
+	vTaskSwitchContext();
+	portRESTORE_CONTEXT();
+	asm volatile("ret");
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Manual context switch callable from ISRs. The first thing
+ * we do is save the registers so we can use a naked attribute.
+ */
+void vPortYieldFromISR(void) __attribute__((naked));
+void vPortYieldFromISR(void)
+{
+	portSAVE_CONTEXT();
+	vTaskSwitchContext();
+	portRESTORE_CONTEXT();
+	asm volatile("reti");
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Context switch function used by the tick.  This must be identical to
+ * vPortYield() from the call to vTaskSwitchContext() onwards.  The only
+ * difference from vPortYield() is the tick count is incremented as the
+ * call comes from the tick ISR.
+ */
+void vPortYieldFromTick(void) __attribute__((naked));
+void vPortYieldFromTick(void)
+{
+	portSAVE_CONTEXT();
+	
+	if (xTaskIncrementTick() != pdFALSE) {
+		vTaskSwitchContext();
+	}
+
+	portRESTORE_CONTEXT();
+
+	asm volatile("reti");
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Setup timer to generate a tick interrupt.
+ */
+static void prvSetupTimerInterrupt(void)
+{
+	TICK_init();
+}
+/*-----------------------------------------------------------*/
+
+#if configUSE_PREEMPTION == 1
+
+/*
+ * Tick ISR for preemptive scheduler.  We can use a naked attribute as
+ * the context is saved at the start of vPortYieldFromTick().  The tick
+ * count is incremented after the context is saved.
+ */
+
+ISR(TICK_INT_vect, ISR_NAKED)
+{
+	/* Clear tick interrupt flag. */
+	CLR_INT(INT_FLAGS, INT_MASK);
+
+	vPortYieldFromTick();
+
+	asm volatile("reti");
+}
+
+#else
+
+/*
+ * Tick ISR for the cooperative scheduler.  All this does is increment the
+ * tick count.  We don't need to switch context, this can only be done by
+ * manual calls to taskYIELD();
+ */
+
+ISR(TICK_INT_vect)
+{
+	/* Clear tick interrupt flag. */
+	INT_FLAGS = INT_MASK;
+	
+	xTaskIncrementTick();
+}
+
+
+#endif
diff --git a/portable/GCC/AVR_AVRDx/porthardware.h b/portable/GCC/AVR_AVRDx/porthardware.h
new file mode 100644
index 0000000..4b0e04b
--- /dev/null
+++ b/portable/GCC/AVR_AVRDx/porthardware.h
@@ -0,0 +1,133 @@
+#ifndef PORTHARDWARE_H
+#define PORTHARDWARE_H
+
+#include "FreeRTOSConfig.h"
+
+/*-----------------------------------------------------------*/
+
+#define CLR_INT(FLAG_REG, FLAG_MASK) \
+		asm volatile(	"push r16\n\t" \
+		"ldi r16, %1\n\t" \
+		"sts %0, r16\n\t" \
+		"pop r16\n\t" \
+		: \
+		: "i"(_SFR_MEM_ADDR(FLAG_REG)),"i"((uint8_t)(FLAG_MASK)) \
+		);
+
+#if ( configUSE_TIMER_INSTANCE == 0 )
+
+	#define TICK_INT_vect			TCB0_INT_vect
+	#define INT_FLAGS				TCB0_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+	
+	#define TICK_init()				{ \
+									TCB0.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB0.INTCTRL = TCB_CAPT_bm; \
+									TCB0.CTRLA   = TCB_ENABLE_bm; \
+									}
+									
+	#define TICK_stop()				{ \
+									TCB0.INTCTRL &= ~TCB_CAPT_bm;\
+									TCB0.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+
+#elif ( configUSE_TIMER_INSTANCE == 1 )
+
+	#define TICK_INT_vect			TCB1_INT_vect
+	#define INT_FLAGS				TCB1_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+	
+	#define TICK_init()				{ \
+									TCB1.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB1.INTCTRL = TCB_CAPT_bm; \
+									TCB1.CTRLA   = TCB_ENABLE_bm; \
+									}
+									
+	#define TICK_stop()				{ \
+									TCB1.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB1.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+		
+#elif ( configUSE_TIMER_INSTANCE == 2 )
+
+	#define TICK_INT_vect			TCB2_INT_vect
+	#define INT_FLAGS				TCB2_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+
+	#define TICK_init()				{ \
+									TCB2.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB2.INTCTRL = TCB_CAPT_bm; \
+									TCB2.CTRLA   = TCB_ENABLE_bm; \
+									}
+									
+	#define TICK_stop()				{ \
+									TCB2.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB2.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+		
+#elif ( configUSE_TIMER_INSTANCE == 3 )
+
+	#define TICK_INT_vect			TCB3_INT_vect
+	#define INT_FLAGS				TCB3_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+	
+	#define TICK_init()				{ \
+									TCB3.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB3.INTCTRL = TCB_CAPT_bm; \
+									TCB3.CTRLA   = TCB_ENABLE_bm; \
+									}
+									
+	#define TICK_stop()				{ \
+									TCB3.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB3.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+	
+#elif ( configUSE_TIMER_INSTANCE == 4 )
+
+	#define TICK_INT_vect			TCB4_INT_vect
+	#define INT_FLAGS				TCB4_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+	
+	#define TICK_init()				{ \
+									TCB4.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB4.INTCTRL = TCB_CAPT_bm; \
+									TCB4.CTRLA   = TCB_ENABLE_bm; \
+									}
+		
+	#define TICK_stop()				{ \
+									TCB4.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB4.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+	
+#elif ( configUSE_TIMER_INSTANCE == 5 )
+	
+	/* Hertz to period for RTC setup */
+	#define RTC_PERIOD_HZ(x)		(32768 * ((1.0 / x)))
+	
+	#define TICK_INT_vect			RTC_CNT_vect
+	#define INT_FLAGS				RTC_INTFLAGS
+	#define INT_MASK				RTC_OVF_bm
+	
+	#define TICK_init()				{ \
+									while (RTC.STATUS > 0); \
+									RTC.CTRLA    = RTC_PRESCALER_DIV1_gc | 1 << RTC_RTCEN_bp; \
+									RTC.PER      = RTC_PERIOD_HZ(configTICK_RATE_HZ); \
+									RTC.INTCTRL  |= 1 << RTC_OVF_bp; \
+									}
+	
+	#define TICK_stop()				{ \
+									RTC.CTRLA	 &= ~(1 << RTC_RTCEN_bp); \
+									RTC.INTCTRL	 &= ~(1 << RTC_OVF_bp); \
+									}
+
+#else
+	#undef TICK_INT_vect
+	#undef INT_FLAGS
+	#undef INT_MASK
+	#undef TICK_init()
+	#error Invalid timer setting.
+#endif
+
+/*-----------------------------------------------------------*/
+
+#endif /* PORTHARDWARE_H */
diff --git a/portable/GCC/AVR_AVRDx/portmacro.h b/portable/GCC/AVR_AVRDx/portmacro.h
new file mode 100644
index 0000000..83d41d3
--- /dev/null
+++ b/portable/GCC/AVR_AVRDx/portmacro.h
@@ -0,0 +1,107 @@
+/*
+ * FreeRTOS Kernel V10.3.1
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * 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.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+*/
+
+#ifndef PORTMACRO_H
+#define PORTMACRO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*-----------------------------------------------------------
+ * 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)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PORTMACRO_H */
diff --git a/portable/GCC/AVR_Mega0/port.c b/portable/GCC/AVR_Mega0/port.c
new file mode 100644
index 0000000..39cdd84
--- /dev/null
+++ b/portable/GCC/AVR_Mega0/port.c
@@ -0,0 +1,338 @@
+/*
+ * FreeRTOS Kernel V10.0.0
+ * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * 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. If you wish to use our Amazon
+ * FreeRTOS name, please do so in a fair use way that does not cause confusion.
+ *
+ * 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.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+#include <stdlib.h>
+
+#include <avr/interrupt.h>
+
+#include "porthardware.h"
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+/*-----------------------------------------------------------
+ * Implementation of functions defined in portable.h for the AVR port.
+ *----------------------------------------------------------*/
+
+/* Start tasks with interrupts enables. */
+#define portFLAGS_INT_ENABLED				((StackType_t) 0x80)
+
+/*-----------------------------------------------------------*/
+
+/* We require the address of the pxCurrentTCB variable, but don't want to know
+any details of its type. */
+typedef void RTOS_TCB_t;
+extern volatile RTOS_TCB_t *volatile pxCurrentTCB;
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Macro to save all the general purpose registers, the save the stack pointer
+ * into the TCB.
+ *
+ * The first thing we do is save the flags then disable interrupts.  This is to
+ * guard our stack against having a context switch interrupt after we have already
+ * pushed the registers onto the stack - causing the 32 registers to be on the
+ * stack twice.
+ *
+ * r1 is set to zero as the compiler expects it to be thus, however some
+ * of the math routines make use of R1.
+ *
+ * The interrupts will have been disabled during the call to portSAVE_CONTEXT()
+ * so we need not worry about reading/writing to the stack pointer.
+ */
+
+#define portSAVE_CONTEXT()                                                                                                             \
+	asm volatile("push	r0						\n\t"                                                                                  \
+	             "in	r0, __SREG__			\n\t"                                                                                  \
+	             "cli							\n\t"                                                                                  \
+	             "push	r0						\n\t"                                                                                  \
+	             "push	r1						\n\t"                                                                                  \
+	             "clr	r1						\n\t"                                                                                  \
+	             "push	r2						\n\t"                                                                                  \
+	             "push	r3						\n\t"                                                                                  \
+	             "push	r4						\n\t"                                                                                  \
+	             "push	r5						\n\t"                                                                                  \
+	             "push	r6						\n\t"                                                                                  \
+	             "push	r7						\n\t"                                                                                  \
+	             "push	r8						\n\t"                                                                                  \
+	             "push	r9						\n\t"                                                                                  \
+	             "push	r10						\n\t"                                                                                  \
+	             "push	r11						\n\t"                                                                                  \
+	             "push	r12						\n\t"                                                                                  \
+	             "push	r13						\n\t"                                                                                  \
+	             "push	r14						\n\t"                                                                                  \
+	             "push	r15						\n\t"                                                                                  \
+	             "push	r16						\n\t"                                                                                  \
+	             "push	r17						\n\t"                                                                                  \
+	             "push	r18						\n\t"                                                                                  \
+	             "push	r19						\n\t"                                                                                  \
+	             "push	r20						\n\t"                                                                                  \
+	             "push	r21						\n\t"                                                                                  \
+	             "push	r22						\n\t"                                                                                  \
+	             "push	r23						\n\t"                                                                                  \
+	             "push	r24						\n\t"                                                                                  \
+	             "push	r25						\n\t"                                                                                  \
+	             "push	r26						\n\t"                                                                                  \
+	             "push	r27						\n\t"                                                                                  \
+	             "push	r28						\n\t"                                                                                  \
+	             "push	r29						\n\t"                                                                                  \
+	             "push	r30						\n\t"                                                                                  \
+	             "push	r31						\n\t"                                                                                  \
+	             "lds	r26, pxCurrentTCB		\n\t"                                                                                  \
+	             "lds	r27, pxCurrentTCB + 1	\n\t"                                                                                  \
+	             "in	r0, __SP_L__			\n\t"                                                                                  \
+	             "st	x+, r0					\n\t"                                                                                  \
+	             "in	r0, __SP_H__			\n\t"                                                                                  \
+	             "st	x+, r0					\n\t");
+
+/*
+ * Opposite to portSAVE_CONTEXT().  Interrupts will have been disabled during
+ * the context save so we can write to the stack pointer.
+ */
+
+#define portRESTORE_CONTEXT()                                                                                                           \
+	asm volatile("lds	r26, pxCurrentTCB		\n\t"                                                                                   \
+	             "lds	r27, pxCurrentTCB + 1	\n\t"                                                                                   \
+	             "ld	r28, x+					\n\t"                                                                                   \
+	             "out	__SP_L__, r28			\n\t"                                                                                   \
+	             "ld	r29, x+					\n\t"                                                                                   \
+	             "out	__SP_H__, r29			\n\t"                                                                                   \
+	             "pop	r31						\n\t"                                                                                   \
+	             "pop	r30						\n\t"                                                                                   \
+	             "pop	r29						\n\t"                                                                                   \
+	             "pop	r28						\n\t"                                                                                   \
+	             "pop	r27						\n\t"                                                                                   \
+	             "pop	r26						\n\t"                                                                                   \
+	             "pop	r25						\n\t"                                                                                   \
+	             "pop	r24						\n\t"                                                                                   \
+	             "pop	r23						\n\t"                                                                                   \
+	             "pop	r22						\n\t"                                                                                   \
+	             "pop	r21						\n\t"                                                                                   \
+	             "pop	r20						\n\t"                                                                                   \
+	             "pop	r19						\n\t"                                                                                   \
+	             "pop	r18						\n\t"                                                                                   \
+	             "pop	r17						\n\t"                                                                                   \
+	             "pop	r16						\n\t"                                                                                   \
+	             "pop	r15						\n\t"                                                                                   \
+	             "pop	r14						\n\t"                                                                                   \
+	             "pop	r13						\n\t"                                                                                   \
+	             "pop	r12						\n\t"                                                                                   \
+	             "pop	r11						\n\t"                                                                                   \
+	             "pop	r10						\n\t"                                                                                   \
+	             "pop	r9						\n\t"                                                                                   \
+	             "pop	r8						\n\t"                                                                                   \
+	             "pop	r7						\n\t"                                                                                   \
+	             "pop	r6						\n\t"                                                                                   \
+	             "pop	r5						\n\t"                                                                                   \
+	             "pop	r4						\n\t"                                                                                   \
+	             "pop	r3						\n\t"                                                                                   \
+	             "pop	r2						\n\t"                                                                                   \
+	             "pop	r1						\n\t"                                                                                   \
+	             "pop	r0						\n\t"                                                                                   \
+	             "out	__SREG__, r0			\n\t"                                                                                   \
+	             "pop	r0						\n\t");
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Perform hardware setup to enable ticks from timer.
+ */
+static void prvSetupTimerInterrupt(void);
+/*-----------------------------------------------------------*/
+
+/*
+ * See header file for description.
+ */
+StackType_t *pxPortInitialiseStack(StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters)
+{
+	uint16_t usAddress;
+
+	/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
+	
+	/* Place a few bytes of known values on the bottom of the stack.
+	This is just useful for debugging. Uncomment if needed. */
+	// *pxTopOfStack = 0x11;
+    // pxTopOfStack--;
+    // *pxTopOfStack = 0x22;
+    // pxTopOfStack--;
+    // *pxTopOfStack = 0x33; 
+    // pxTopOfStack--;
+
+	/* The start of the task code will be popped off the stack last, so place
+	it on first. */
+	usAddress     = (uint16_t)pxCode;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+	pxTopOfStack--;
+
+	usAddress >>= 8;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+	pxTopOfStack--;
+
+	/* Next simulate the stack as if after a call to portSAVE_CONTEXT().
+	portSAVE_CONTEXT places the flags on the stack immediately after r0
+	to ensure the interrupts get disabled as soon as possible, and so ensuring
+	the stack use is minimal should a context switch interrupt occur. */
+	*pxTopOfStack = (StackType_t)0x00; /* R0 */
+	pxTopOfStack--;
+	*pxTopOfStack = portFLAGS_INT_ENABLED;
+	pxTopOfStack--;
+
+	/* Now the remaining registers.   The compiler expects R1 to be 0. */
+	*pxTopOfStack = (StackType_t)0x00; /* R1 */
+
+	/* Leave R2 - R23 untouched */
+	pxTopOfStack -= 23;
+
+	/* Place the parameter on the stack in the expected location. */
+	usAddress     = (uint16_t)pvParameters;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+	pxTopOfStack--;
+
+	usAddress >>= 8;
+	*pxTopOfStack = (StackType_t)(usAddress & (uint16_t)0x00ff);
+
+	/* Leave register R26 - R31 untouched */
+	pxTopOfStack -= 7;
+
+	/*lint +e950 +e611 +e923 */
+
+	return pxTopOfStack;
+}
+/*-----------------------------------------------------------*/
+
+BaseType_t xPortStartScheduler(void)
+{
+	/* Setup the hardware to generate the tick. */
+	prvSetupTimerInterrupt();
+
+	/* Restore the context of the first task that is going to run. */
+	portRESTORE_CONTEXT();
+
+	/* Simulate a function call end as generated by the compiler.  We will now
+	jump to the start of the task the context of which we have just restored. */
+	asm volatile("ret");
+
+	/* Should not get here. */
+	return pdTRUE;
+}
+/*-----------------------------------------------------------*/
+
+void vPortEndScheduler(void)
+{
+	/* vPortEndScheduler is not implemented in this port. */
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Manual context switch.  The first thing we do is save the registers so we
+ * can use a naked attribute.
+ */
+void vPortYield(void) __attribute__((naked));
+void vPortYield(void)
+{
+	portSAVE_CONTEXT();
+	vTaskSwitchContext();
+	portRESTORE_CONTEXT();
+	asm volatile("ret");
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Manual context switch callable from ISRs. The first thing
+ * we do is save the registers so we can use a naked attribute.
+ */
+void vPortYieldFromISR(void) __attribute__((naked));
+void vPortYieldFromISR(void)
+{
+	portSAVE_CONTEXT();
+	vTaskSwitchContext();
+	portRESTORE_CONTEXT();
+	asm volatile("reti");
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Context switch function used by the tick.  This must be identical to
+ * vPortYield() from the call to vTaskSwitchContext() onwards.  The only
+ * difference from vPortYield() is the tick count is incremented as the
+ * call comes from the tick ISR.
+ */
+void vPortYieldFromTick(void) __attribute__((naked));
+void vPortYieldFromTick(void)
+{
+	portSAVE_CONTEXT();
+	if (xTaskIncrementTick() != pdFALSE) {
+		vTaskSwitchContext();
+	}
+
+	portRESTORE_CONTEXT();
+
+	asm volatile("reti");
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Setup timer to generate a tick interrupt.
+ */
+static void prvSetupTimerInterrupt(void)
+{
+	TICK_init();
+}
+/*-----------------------------------------------------------*/
+
+#if configUSE_PREEMPTION == 1
+
+/*
+ * Tick ISR for preemptive scheduler.  We can use a naked attribute as
+ * the context is saved at the start of vPortYieldFromTick().  The tick
+ * count is incremented after the context is saved.
+ */
+ISR(TICK_INT_vect, ISR_NAKED)
+{
+	/* Clear tick interrupt flag. */
+	CLR_INT(INT_FLAGS, INT_MASK);
+
+	vPortYieldFromTick();
+
+	asm volatile("reti");
+}
+#else
+
+/*
+ * Tick ISR for the cooperative scheduler.  All this does is increment the
+ * tick count.  We don't need to switch context, this can only be done by
+ * manual calls to taskYIELD();
+ */
+ISR(TICK_INT_vect)
+{
+	/* Clear tick interrupt flag. */
+	INT_FLAGS = INT_MASK;
+	xTaskIncrementTick();
+}
+#endif
diff --git a/portable/GCC/AVR_Mega0/porthardware.h b/portable/GCC/AVR_Mega0/porthardware.h
new file mode 100644
index 0000000..b0d9002
--- /dev/null
+++ b/portable/GCC/AVR_Mega0/porthardware.h
@@ -0,0 +1,113 @@
+#ifndef PORTHARDWARE_H
+#define PORTHARDWARE_H
+
+#include "FreeRTOSConfig.h"
+
+/*-----------------------------------------------------------*/
+
+#define CLR_INT(FLAG_REG, FLAG_MASK) \
+		asm volatile(	"push r16\n\t" \
+		"ldi r16, %1\n\t" \
+		"sts %0, r16\n\t" \
+		"pop r16\n\t" \
+		: \
+		: "i"(_SFR_MEM_ADDR(FLAG_REG)),"i"((uint8_t)(FLAG_MASK)) \
+		);
+
+#if ( configUSE_TIMER_INSTANCE == 0 )
+
+	#define TICK_INT_vect			TCB0_INT_vect
+	#define INT_FLAGS				TCB0_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+
+	#define TICK_init()				{ \
+									TCB0.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB0.INTCTRL = TCB_CAPT_bm; \
+									TCB0.CTRLA   = TCB_ENABLE_bm; \
+									}
+
+	#define TICK_stop()				{ \
+									TCB0.INTCTRL &= ~TCB_CAPT_bm;\
+									TCB0.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+
+#elif ( configUSE_TIMER_INSTANCE == 1 )
+
+	#define TICK_INT_vect			TCB1_INT_vect
+	#define INT_FLAGS				TCB1_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+
+	#define TICK_init()				{ \
+									TCB1.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB1.INTCTRL = TCB_CAPT_bm; \
+									TCB1.CTRLA   = TCB_ENABLE_bm; \
+									}
+
+	#define TICK_stop()				{ \
+									TCB1.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB1.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+
+#elif ( configUSE_TIMER_INSTANCE == 2 )
+
+	#define TICK_INT_vect			TCB2_INT_vect
+	#define INT_FLAGS				TCB2_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+
+	#define TICK_init()				{ \
+									TCB2.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB2.INTCTRL = TCB_CAPT_bm; \
+									TCB2.CTRLA   = TCB_ENABLE_bm; \
+									}
+
+	#define TICK_stop()				{ \
+									TCB2.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB2.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+
+#elif ( configUSE_TIMER_INSTANCE == 3 )
+
+	#define TICK_INT_vect			TCB3_INT_vect
+	#define INT_FLAGS				TCB3_INTFLAGS
+	#define INT_MASK				TCB_CAPT_bm
+
+	#define TICK_init()				{ \
+									TCB3.CCMP    = configCPU_CLOCK_HZ / configTICK_RATE_HZ; \
+									TCB3.INTCTRL = TCB_CAPT_bm; \
+									TCB3.CTRLA   = TCB_ENABLE_bm; \
+									}
+
+	#define TICK_stop() 			{ \
+									TCB3.INTCTRL &= ~TCB_CAPT_bm; \
+									TCB3.CTRLA   &= ~TCB_ENABLE_bm; \
+									}
+
+#elif ( configUSE_TIMER_INSTANCE == 4 )
+
+	#define TICK_INT_vect			RTC_CNT_vect
+	#define INT_FLAGS				RTC_INTFLAGS
+	#define INT_MASK				RTC_OVF_bm
+
+	#define RTC_PERIOD_HZ(x)		(32768 * ( (1.0 / x) ) )
+	#define TICK_init()				{ \
+									while (RTC.STATUS > 0); \
+									RTC.CTRLA    = RTC_PRESCALER_DIV1_gc | 1 << RTC_RTCEN_bp; \
+									RTC.PER      = RTC_PERIOD_HZ(configTICK_RATE_HZ); \
+									RTC.INTCTRL |= 1 << RTC_OVF_bp; \
+									}
+
+	#define TICK_stop()				{ \
+									RTC.CTRLA   &= ~(1 << RTC_RTCEN_bp); \
+									RTC.INTCTRL &= ~(1 << RTC_OVF_bp); \
+									}
+
+#else
+#undef TICK_INT_vect
+#undef INT_FLAGS
+#undef INT_MASK
+#error Invalid timer setting
+#endif
+
+/*-----------------------------------------------------------*/
+
+#endif /* PORTHARDWARE_H */
diff --git a/portable/GCC/AVR_Mega0/portmacro.h b/portable/GCC/AVR_Mega0/portmacro.h
new file mode 100644
index 0000000..040f498
--- /dev/null
+++ b/portable/GCC/AVR_Mega0/portmacro.h
@@ -0,0 +1,109 @@
+/*
+ * FreeRTOS Kernel V10.3.1
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * 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.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+*/
+
+#ifndef PORTMACRO_H
+#define PORTMACRO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*-----------------------------------------------------------
+ * 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)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PORTMACRO_H */
+