Install Free Rtos

FreeRTOS ™ Real-time operating system for microcontrollers. Developed in partnership with the world’s leading chip companies over a 15-year period, and now downloaded every 170 seconds, FreeRTOS is a market-leading real-time operating system for microcontrollers and small microprocessors. This page describes how to install QEMU for use with FreeRTOS demo applications that target the QEMU emulator, rather than physical chips. Note: At the time of writing all demo projects that target QEMU were developed and tested on Windows hosts. Download and install QEMU - there is a separate download page for pre-built QEMU Windows executables. Well I’ve never used that demo before, but just from the output you posted I guess you need to download FreeRTOS, then in the IDE go to PreferencesCSSBuildVariables and create a variable called FREERTOSINSTALLDIR that is set to wherever you downloaded FreeRTOS too. How can i install freertosPosted by mafalda14 on November 28, 2007Hello, Im trying to install freertos in my board, it’s at91sam9263, i’ve the source code from the at91sam9260 and i don’t now what have to adapt and where have i to insert the bin. Next, you can use the FreeRTOS console to get a custom download of the operating system by choosing the libraries relevant to your use case. The console will guide you through this process so you can begin developing immediately. You can also find FreeRTOS on GitHub, or FreeRTOS.org. It will contain all libraries and hardware-specific porting.

Introduction

Some ARM Cortex-A processors incorporate ARM's own Generic Interrupt Controller(GIC), while others incorporate proprietary interrupt controllers. Separate webpages are provided to give instructions on using the RTOS in both scenarios.This page provides information on running the RTOS on an ARM Cortex-Aembedded processor that does not incorporates ARM's own Generic Interrupt Controller (GIC).See also the web page that describesrunning the RTOS on an ARM Cortex-Aembedded processor that also includes ARM's GIC.

On this page:

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Features of the FreeRTOS ARM Cortex-A RTOS port

The FreeRTOS ARM Cortex-A port for microprocessors that use a proprietary interrupt controller:
  • Extends the use of the familiar, small, simple, deterministic, de facto standard FreeRTOS kernel beyond the microcontroller market
  • Supports interrupt nesting (note that, unlike the RTOS version for ARM Cortex-A parts that incorporate a GIC, the version for processors with a proprietary interrupt controller does not keep a subset of interrupt priorities permanently enabled - this is because no assumptions are made as to the interrupt controller in use).
  • Includes hardware floating point support
  • Uses a flat/linear memory model (the MMU is not supported).


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Using the floating point unit (FPU)

Tasks that make use of the hardware floating point unit must call portTASK_USES_FLOATING_POINT()before any floating point calculations are executed. It is only necessary tocall portTASK_USES_FLOATING_POINT() once per task. For example:


It should be noted that, by default, the Cortex-A9 port does not support the use of the floating pointunit in interrupts. If it is necessary to use the floating point unit in interruptsthen it will also be necessary to save the entire floating point context to thestack on entry to each (potentially nested) interrupt.


ARM Cortex-A specific FreeRTOSConfig.h settings

The following settings must be included in FreeRTOSConfig.h. Note these settingsare specific to the ARM Cortex-A RTOS port for processors that use a proprietaryinterrupt controller. The settings for the RTOS port for ARM Cortex-A processorsthat use the ARM GIC are different because they also configure the GIC.
  • configFPU_D32

    If the FPU has 16 'd' registers then set configFPU_D32 to 0. If the FPU has 32 'd' registers then set configFPU_D32 to 1.

  • configINTERRUPT_VECTOR_ADDRESS

    Most interrupt controllers contain a register from which the address of the currently asserted (executing) interrupt handler can be read. If such a register exists then set configINTERRUPT_VECTOR_ADDRESS to its address. If such a register does not exist then set configINTERRUPT_VECTOR_ADDRESS to the address of a variable that points to a central interrupt handler.

  • configEOI_ADDRESS

    Most interrupt controllers contain an End of Interrupt (EOI) register that must be written to at the end of an interrupt handing routine. If such a register exists then set configEIO_ADDRESS to its address. If a register does not exist then set configEIO_ADDRESS to the address of a variable to which writes will be harmless.

  • configCLEAR_TICK_INTERRUPT()

    As described in the 'Configuring and installing the RTOS tick interrupt' section below, the RTOS tick interrupt can be generated from any convenient timer source. If the interrupt generated by the selected timer must be cleared within its handling function then defined configCLEAR_TICK_INTERRUPT() to clear the interrupt. If the interrupt generated by the selected timer does not require explicit clearing then configCLEAR_TICK_INTERRUPT() can be defined to nothing (so it does not generate any code).

Note: If there is an official demo forthe Cortex-A9 processor you are using then theFreeRTOSConfig.h file provided with the demo will already contain the correctsettings.


Configuring and installing the RTOS tick interrupt

Install Free RtosEvery official FreeRTOS demo that targets an ARM Cortex-A based embedded processorincludes code to configure a timer to generate the RTOS tick interrupt, and installthe FreeRTOS tick interrupt handler. The following information is only requiredif you need to change the provided implementation.

The macro configSETUP_TICK_INTERRUPT() is called by the RTOS kernel port layer.configSETUP_TICK_INTERRUPT() must be #defined in FreeRTOSConfig.h to configurea peripheral to generate a periodic interrupt at the frequency set by theconfigTICK_RATE_HZ FreeRTOSConfig.h setting. FreeRTOS_Tick_Handler() must thenbe installed as the interrupt's handling function. For example:


Interrupt handling

Official RTOS demo applicationsinclude example interrupt handlers. Refer to the official RTOS demo applicationfor the processor in use to find examples and reference source code.

Interrupt entry, nesting, and exit is managed by the RTOS kernel port layer sointerrupt handlers provided by the application writer can be standard C functions.Specific interrupt related pragmas, assembly code wrappers or attributequalifiers are not required.

Interrupt handling routes provided by the application writer are called by theRTOS with interrupts enabled.

Also see the description of the configINTERRUPT_VECTOR_ADDRESS FreeRTOSConfig.hsetting above.


Installing the FreeRTOS IRQ and SWI (SVC) interrupt handlers

FreeRTOS_IRQ_Handler() must be installed as the Cortex-A's IRQ handler.

FreeRTOS_SWI_Handler() must be installed as the Cortex-A's SWI (SVC) handler.

If it is not possible to edit the interrupt vector code then map the FreeRTOShandlers to the required handler names using #defines in FreeRTOSConfig.h. For example,if the installed handlers are called IRQ_Handler() and SWI_Handler() respectively, thenthe FreeRTOS handlers can be mapped to these names by adding the following two linesto FreeRTOSConfig.h.


Cortex-A processor modes and stacks

The C start up code must, as a minimum, configure stacks for the IRQ and Supervisor modesof the Cortex-A processor.

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main() must be called from a privileged mode, preferablySupervisor mode.

It is not necessary to allocate a stack to User/System mode unless main() iscalled from System mode (main() must not be called from User mode). If a stackis allocated to User/System mode it will not be used after the RTOS kernel hasbeen started.

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To get started quickly, you can choose hardware that supports FreeRTOS features and capabilities from the AWS Partner Device Catalog. You can validate your devices will run FreeRTOS using the AWS IoT Device Tester. If you want to get started without hardware, you can use the FreeRTOS Windows simulator.

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Next, you can use the FreeRTOS console to get a custom download of the operating system by choosing the libraries relevant to your use case. The console will guide you through this process so you can begin developing immediately.

You can also find FreeRTOS on GitHub, or FreeRTOS.org. It will contain all libraries and hardware-specific porting layers, which you can selectively include or remove after download based on your use case. You can also access the stand-alone FreeRTOS kernel through any of these channels. For Bluetooth Low Energy (BLE), you can download source code from the FreeRTOS GitHub repository and the companion Android and iOS SDKs from GitHub.

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FreeRTOS is open source, so you are free to extend, modify, or delete any of the source code libraries.