Move the AVR pors from the main repo (#2)

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

6 files changed, 1169 insertions, 0 deletions

diff --git a/GCC/AVR_AVRDx/port.c b/GCC/AVR_AVRDx/port.c
new file mode 100644
index 0000000..f81af94
--- /dev/null
+++ b/GCC/AVR_AVRDx/port.c
@@ -0,0 +1,346 @@
+/*
+ * 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
+ *
+ */
+
+#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  /* if configUSE_PREEMPTION == 1 */
+
+/*
+ * 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 /* if configUSE_PREEMPTION == 1 */
diff --git a/GCC/AVR_AVRDx/porthardware.h b/GCC/AVR_AVRDx/porthardware.h
new file mode 100644
index 0000000..ca0302e
--- /dev/null
+++ b/GCC/AVR_AVRDx/porthardware.h
@@ -0,0 +1,137 @@
+/*
+ * 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 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;                          \
+    }
+
+#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;                          \
+    }
+
+#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;                          \
+    }
+
+#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;                          \
+    }
+
+#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;                          \
+    }
+
+#elif ( configUSE_TIMER_INSTANCE == 5 )
+
+    #define TICK_INT_vect    RTC_CNT_vect
+    #define INT_FLAGS        RTC_INTFLAGS
+    #define INT_MASK         RTC_OVF_bm
+
+/* Hertz to period for RTC setup */
+    #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;                        \
+    }
+
+#else /* if ( configUSE_TIMER_INSTANCE == 0 ) */
+    #undef TICK_INT_vect
+    #undef INT_FLAGS
+    #undef INT_MASK
+    #undef TICK_init()
+    #error Invalid timer setting.
+#endif /* if ( configUSE_TIMER_INSTANCE == 0 ) */
+
+/*-----------------------------------------------------------*/
+
+#endif /* PORTHARDWARE_H */
diff --git a/GCC/AVR_AVRDx/portmacro.h b/GCC/AVR_AVRDx/portmacro.h
new file mode 100644
index 0000000..f26acca
--- /dev/null
+++ b/GCC/AVR_AVRDx/portmacro.h
@@ -0,0 +1,111 @@
+/*
+ * 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 */
diff --git a/GCC/AVR_Mega0/port.c b/GCC/AVR_Mega0/port.c
new file mode 100644
index 0000000..1e25d13
--- /dev/null
+++ b/GCC/AVR_Mega0/port.c
@@ -0,0 +1,340 @@
+/*
+ * 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
+ *
+ */
+
+#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  /* if configUSE_PREEMPTION == 1 */
+
+/*
+ * 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 /* if configUSE_PREEMPTION == 1 */
diff --git a/GCC/AVR_Mega0/porthardware.h b/GCC/AVR_Mega0/porthardware.h
new file mode 100644
index 0000000..758d949
--- /dev/null
+++ b/GCC/AVR_Mega0/porthardware.h
@@ -0,0 +1,124 @@
+/*
+ * 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 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;                          \
+    }
+
+#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;                          \
+    }
+
+#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;                          \
+    }
+
+#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;                          \
+    }
+
+#elif ( configUSE_TIMER_INSTANCE == 4 )
+
+    #define TICK_INT_vect    RTC_CNT_vect
+    #define INT_FLAGS        RTC_INTFLAGS
+    #define INT_MASK         RTC_OVF_bm
+
+/* Hertz to period for RTC setup */
+    #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;                        \
+    }
+
+#else /* if ( configUSE_TIMER_INSTANCE == 0 ) */
+    #undef TICK_INT_vect
+    #undef INT_FLAGS
+    #undef INT_MASK
+    #undef TICK_init()
+    #error Invalid timer setting.
+#endif /* if ( configUSE_TIMER_INSTANCE == 0 ) */
+
+/*-----------------------------------------------------------*/
+
+#endif /* PORTHARDWARE_H */
diff --git a/GCC/AVR_Mega0/portmacro.h b/GCC/AVR_Mega0/portmacro.h
new file mode 100644
index 0000000..7d66a73
--- /dev/null
+++ b/GCC/AVR_Mega0/portmacro.h
@@ -0,0 +1,111 @@
+/*
+ * 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 */