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Update to AVR_Mega0 and AVR_Dx GCC ports + addition of their IAR equivalents (#106)
* Removed TICK_stop() macro from portable/GCC/{AVR_AVRDx, AVR_Mega0}/porthardware.h because it is not used anywhere.
* Updated indentation in portable/GCC/{AVR_AVRDx, AVR_Mega0}/* files.
* Added portable/IAR/{AVR_AVRDx, AVR_Mega0 folders.
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14 changed files with 1922 additions and 516 deletions
293
portable/IAR/AVR_AVRDx/port.c
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293
portable/IAR/AVR_AVRDx/port.c
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/*
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* FreeRTOS Kernel V10.0.0
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* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software. If you wish to use our Amazon
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* FreeRTOS name, please do so in a fair use way that does not cause confusion.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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#include <stdlib.h>
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#include "porthardware.h"
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#include "FreeRTOS.h"
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#include "task.h"
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/*-----------------------------------------------------------
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* Implementation of functions defined in portable.h for the AVR port.
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*----------------------------------------------------------*/
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/* Start tasks with interrupts enables. */
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#define portFLAGS_INT_ENABLED ((StackType_t) 0x80)
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/*-----------------------------------------------------------*/
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#define portBYTES_USED_BY_RETURN_ADDRESS 2
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#define portNO_CRITICAL_NESTING ( ( UBaseType_t ) 0 )
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/* Stores the critical section nesting. This must not be initialised to 0.
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It will be initialised when a task starts. */
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UBaseType_t uxCriticalNesting = 0x50;
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/*
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* Setup timer to generate a tick interrupt.
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*/
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static void prvSetupTimerInterrupt(void);
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/*
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* The IAR compiler does not have full support for inline assembler, so
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* these are defined in the portmacro assembler file.
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*/
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extern void vPortYieldFromTick( void );
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extern void vPortStart( void );
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/*-----------------------------------------------------------*/
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/*
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* See header file for description.
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*/
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StackType_t *pxPortInitialiseStack(StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters)
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{
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uint16_t usAddress;
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StackType_t *pxTopOfHardwareStack;
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/* Simulate how the stack would look after a call to vPortYield(). */
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/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
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/* The IAR compiler requires two stacks per task. First there is the
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hardware call stack which uses the AVR stack pointer. Second there is the
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software stack (local variables, parameter passing, etc.) which uses the
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AVR Y register.
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This function places both stacks within the memory block passed in as the
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first parameter. The hardware stack is placed at the bottom of the memory
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block. A gap is then left for the hardware stack to grow. Next the software
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stack is placed. The amount of space between the software and hardware
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stacks is defined by configCALL_STACK_SIZE.
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The first part of the stack is the hardware stack. Place the start
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address of the task on the hardware stack. */
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/* Place a few bytes of known values on the bottom of the stack.
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This is just useful for debugging. */
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//*pxTopOfStack = 0x11;
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//pxTopOfStack--;
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//*pxTopOfStack = 0x22;
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//pxTopOfStack--;
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//*pxTopOfStack = 0x33;
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//pxTopOfStack--;
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/* Remember where the top of the hardware stack is - this is required
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below. */
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pxTopOfHardwareStack = pxTopOfStack;
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usAddress = ( uint16_t ) pxCode;
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*pxTopOfStack = ( StackType_t ) ( usAddress & ( uint16_t ) 0x00ff );
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pxTopOfStack--;
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usAddress >>= 8;
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*pxTopOfStack = ( StackType_t ) ( usAddress & ( uint16_t ) 0x00ff );
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pxTopOfStack--;
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/* Leave enough space for the hardware stack before starting the software
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stack. The '- 2' is because we have already used two spaces for the
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address of the start of the task. */
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pxTopOfStack -= ( configCALL_STACK_SIZE - 2 );
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/* Next simulate the stack as if after a call to portSAVE_CONTEXT().
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portSAVE_CONTEXT places the flags on the stack immediately after r0
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to ensure the interrupts get disabled as soon as possible, and so ensuring
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the stack use is minimal should a context switch interrupt occur. */
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*pxTopOfStack = ( StackType_t ) 0x00; /* R0 */
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pxTopOfStack--;
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*pxTopOfStack = portFLAGS_INT_ENABLED;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x00; /* RAMPZ */
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pxTopOfStack--;
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/* Next place the address of the hardware stack. This is required so
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the AVR stack pointer can be restored to point to the hardware stack. */
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pxTopOfHardwareStack -= portBYTES_USED_BY_RETURN_ADDRESS;
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usAddress = ( uint16_t ) pxTopOfHardwareStack;
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/* SPL */
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*pxTopOfStack = ( StackType_t ) ( usAddress & ( uint16_t ) 0x00ff );
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pxTopOfStack--;
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/* SPH */
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usAddress >>= 8;
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*pxTopOfStack = ( StackType_t ) ( usAddress & ( uint16_t ) 0x00ff );
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pxTopOfStack--;
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/* Now the remaining registers. */
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*pxTopOfStack = ( StackType_t ) 0x01; /* R1 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x02; /* R2 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x03; /* R3 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x04; /* R4 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x05; /* R5 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x06; /* R6 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x07; /* R7 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x08; /* R8 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x09; /* R9 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x10; /* R10 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x11; /* R11 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x12; /* R12 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x13; /* R13 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x14; /* R14 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x15; /* R15 */
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pxTopOfStack--;
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/* Place the parameter on the stack in the expected location. */
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usAddress = (uint16_t) pvParameters;
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*pxTopOfStack = (StackType_t) (usAddress & (uint16_t) 0x00ff);
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pxTopOfStack--;
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usAddress >>= 8;
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*pxTopOfStack = (StackType_t) (usAddress & (uint16_t) 0x00ff);
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x18; /* R18 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x19; /* R19 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x20; /* R20 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x21; /* R21 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x22; /* R22 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x23; /* R23 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x24; /* R24 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x25; /* R25 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x26; /* R26 X */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x27; /* R27 */
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pxTopOfStack--;
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/* The Y register is not stored as it is used as the software stack and
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gets saved into the task control block. */
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*pxTopOfStack = ( StackType_t ) 0x30; /* R30 Z */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x031; /* R31 */
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pxTopOfStack--;
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*pxTopOfStack = portNO_CRITICAL_NESTING; /* Critical nesting is zero when the task starts. */
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/*lint +e950 +e611 +e923 */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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BaseType_t xPortStartScheduler(void)
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{
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/* Setup the hardware to generate the tick. */
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prvSetupTimerInterrupt();
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/* Restore the context of the first task that is going to run.
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Normally we would just call portRESTORE_CONTEXT() here, but as the IAR
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compiler does not fully support inline assembler we have to make a call.*/
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vPortStart();
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/* Should not get here. */
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return pdTRUE;
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}
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/*-----------------------------------------------------------*/
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void vPortEndScheduler(void)
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{
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/* vPortEndScheduler is not implemented in this port. */
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}
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/*-----------------------------------------------------------*/
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/*
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* Setup timer to generate a tick interrupt.
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*/
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static void prvSetupTimerInterrupt(void)
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{
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TICK_init();
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}
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/*-----------------------------------------------------------*/
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#if configUSE_PREEMPTION == 1
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/*
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* Tick ISR for preemptive scheduler. We can use a naked attribute as
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* the context is saved at the start of vPortYieldFromTick(). The tick
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* count is incremented after the context is saved.
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*/
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__task void TICK_INT(void)
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{
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vPortYieldFromTick();
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asm("reti");
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}
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#else
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/*
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* Tick ISR for the cooperative scheduler. All this does is increment the
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* tick count. We don't need to switch context, this can only be done by
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* manual calls to taskYIELD();
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*/
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__interrupt void TICK_INT(void)
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{
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/* Clear tick interrupt flag. */
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INT_FLAGS = INT_MASK;
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xTaskIncrementTick();
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}
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#endif
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/*-----------------------------------------------------------*/
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void vPortEnterCritical( void )
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{
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portDISABLE_INTERRUPTS();
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uxCriticalNesting++;
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}
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/*-----------------------------------------------------------*/
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void vPortExitCritical( void )
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{
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uxCriticalNesting--;
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if( uxCriticalNesting == portNO_CRITICAL_NESTING )
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{
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portENABLE_INTERRUPTS();
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}
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}
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