Hi Fred, > I currently looking to integrate the RF transceiver from Atmel in one of > my design and I just wonder if someone have something. Even the TX power tolerance of Atmel transceivers is +/-3dB, which means I am getting good preformance with RF as I can easily get Atmel: Atmel RF datasheet (April ), 4. Banner, R., Orda, A.: Multi-objective topology control in wireless networks.
|Published (Last):||10 October 2017|
|PDF File Size:||20.16 Mb|
|ePub File Size:||11.24 Mb|
|Price:||Free* [*Free Regsitration Required]|
Embedded microcontroller units are spreading in thousands of applications, ranging from single to distributed systems, control applications, multimedia, communication, medical applications and many others.
Modern microcontrollers, which are growing in computational power, speed and interfacing capabilities, are more and more feeling the rd230 of tools to make the development of complex scalable applications easier.
Atmel AVR8 – ErikaWiki
Embedded applications often require tight control on the temporal behavior of each single activity in the system. Real-time complex system systems such as Wireless Sensor Networks are nowadays deployed in academic and industrial tf230. The very limited set of resources available in the popular hardware platforms, and the diversified domains of WSN applications, require the adoption of an Operating System responding to the following pre-requisites:.
RT-Druid will be used to quickly configure the application, setting temporal parameters of real-time tasks, memory requirements, stack allocation and many other parameters. Moreover, RT-Druid generates the application template, and leaves the developer the task to implement the logic of each single task.
While programming the application, qtmel developer can exploit the power and flexibility offered by the primitives of the ERIKA Enterprise real-time kernel. The purpose of this document is to describe all the information needed to create, develop and modify an Erika Enterprise application for the AVR family of microcontrollers.
As a final note, all the settings which are explained in this document apply both to Erika Enterprise if not otherwise stated. Atmel AVR Studio is a development environment for Microsoft Windows which integrates a source code editor, an instruction set simulator and a debugger. In addition to the traditional development flow, Rv230 Srl provides a design and configuration environment named RT-Druid, based on Eclipse.
Eclipse is an open framework initially developed by IBM, which allows the possibility of integrating various development tools in a common environment. Application compilation is also done inside the Eclipse Framework. In fact, the RTDruid rf320 generator is able to generate the Erika Enterprise configuration files together with a set of configuration files typically, a makefile plus a set of.
The choice of the Cygwin environment has been done to simplify the building process of an application: Moreover, these tools are typically available for free rf203 the Linux platform, easing in this way the atnel of the application to a free development environment such atmep Linux.
Using ANT or the standalone version, the developer can automatically generate from scripts the configuration data and the makefiles which are then used to compile the application. This removes the need of opening the graphical environment to compile an application, providing a way to implement automatic compilation scripts and regression tests.
The porting provides both the binutils package and the gcc package, plus a set of libraries which can be used to control the various peripherals provided by the AVR8 microcontrollers. The following list describes the various packages which contains the various parts of the compilation toolchain:. The second and third textboxes are useful if you are using a development environment based on the Crossbow Mib5x0 board.
In particular, the second textbox, labeled Uisp path, refers to the installation directory of the uisp programmer for R230 Mib5x0 board, and the third textbox, labeled Serial port device, refers to the COM serial port where rf30 board is attached. This section describes the details about the various atme options which are available to create and compile atmep ERIKA Enterprise application for a AVR8 microcontroller. The typical compilation process of an ERIKA Enterprise application involves the computation of a dependency file which is used to understand which are the files which needs to be compiled or updated.
The typical compilation process of an Erika Enterprise application produces various files which can be used to ef230 analyze the code generated by the AVR8GCC compiler. In particular, from each. SRC file is produced containing the corresponding assembler listing, which is then compiled by the Avr-Gcc compiler to produce the.
It is possible to avoid the intermediate step which leads to the production of the. In that case, the compiler will be responsible of producing the. O file directly fr230 the. This in general also speeds up the compilation process a little bit.
The default compilation process typically prints only a compact output for each compilation step. That is in ateml not useful whenever a file is not compiled properly and the user wants to r230 the exact command which is executed in the compilation process. The default compiler set-up does not include optimizations. The source files which can be put in an RT-Druid project are composed by C-language files with extension.
Assembler files are always preprocessed by the C preprocessor. All the application files which has to be included in the final application needs to be listed inside the OIL file, as in the following OIL example:. In a monostack configuration, only a single stack exists in the system.
No blocking primitives are supported, and all the tasks and interrupts execute on the same stack. In this case, the one and only stack starts from the gf230 of the application allocated memory, growing towards higher addresses.
In a multistack configuration, the kernel support the existence of different stacks in the same application. Having different stacks allow the application tasks to use blocking primitives like WaitSem and WaitEventwhich basically may block the execution of the running task.
In that case, the calling task must have a private stack which is changed upon blocking.
The stack will be selected again when the task will be rescheduled. There are different stacks available in a multistack configuration:. In the AVR8 architecture, the shared stack works as in the monostack configuration, that is it is allocated at the end of the SRAM data memory, growing towards lower addresses.
The IRQ stack and the private stacks, instead, are allocated in the application data space as arrays. The following example shows an OIL configuration which configures a multistack kernel without a separate IRQ stack in this case, IRQ handlers execute on the stack of the interrupted task:.
The following example shows an OIL configuration which configures a multistack kernel with a separate IRQ stack in this case, some registers are saved on the stack of the interrupted task, but the IRQ handler C function is executed on a separate IRQ stack.
In this example is showed also the task0 that uses a private stack. Atmel produces various families of the AVR8 microcontrollers, each one with different peripherals armel memory sizes. The AVR8GCC specifies the various peripherals and memory areas by passing an appropriate command line parameter which selects the right linker script for the specified device.
For xtmel reason, the OIL file allows the specification of the rff230 used, as in the following example:. The lowest addresses of the interrupt vector table is allocated to the RESET and to the interrupt vectors. Interrupt handlers placed at lower addresses has higher hardware priorities than interrupt handlers placed at higher addresses. The complete list of vectors entries is shown below for every supported microcontroller. All peripheral Interrupts aatmel prioritized according to their interrupt vector address, where the lowest interrupt vector address atmsl the highest interrupt priority.
To use the external interrupt source the user must set the external interrupt mask with the following function.
Enables wtmel external interrupt source that are specified in the 8-bit bitmask. For example, if the third bit in the bitmask is set, the third external interrupt will be enabled. The number atme hardware timers in the MEGA family is highly dependent on the particular chip used.
For example, the ATmega device has 4 timers 2 8-bit timers and 2 bit timers. The timers used in the application with the corresponding prescalers can be specified in the OIL file these settings applies to ATmega The timer0 have also the prescaler factor DIV The User can use inside the source code of application the following functions to use the timer. All peripherals can select between three different priority levels for their interrupts: Interrupts are prioritized according to their level and their interrupt vector address.
Medium-level interrupts will interrupt low-level interrupt handlers. High-level interrupts will interrupt both medium- and rf23 interrupt handlers.
Within atmle level, the interrupt priority is decided from the interrupt vector address, where the lowest interrupt vector address has the highest interrupt priority. The MCU Driver offers two levels of error checking, extended status for development phase and standard status for production phase.
The extended status allows for enhanced plausibility checks on calling MCU Driver services. Due to the additional error checking it requires more execution time and memory space than the standard version. However, many errors can be found in a test phase. After all errors have been eliminated, the systemcan be recompiled with the standard version. The behaviour of those services can be synchronous or asynchronous. The E2P Driver offers two levels of error checking, extended status for development armel and standard status for production phase.
The extended status allows for enhanced plausibility checks on calling E2P Driver services. The number of hardware timers atel the TINY family is highly dependent on the particular chip used. For example, the ATtiny device has 2 timers 1 8-bit timers and 1 bit timers. The timers used in the application with the corresponding prescalers can be specified in the OIL file these settings applies to ATtiny The RT-Druid code generator will handle the the conversion between the relative deadline value in the corresponding timing value automatically.
In general, that value depends on the timing reference which is made available by the AVR. The 16 bit timer is obtained by using the timer1 available on the AVR.
[Tinyos-help] Atmel RF230
The clock used for the timers is the system clock, with a tick time equal to 1 Fc. Ahmel is the frequency of the oscillator, and depends on the application configuration. In that case, the OIL file should contain the following line:.
Please note that both boards mib and mib are supported, enabling the programming of the armel and micaz nodes see Figure 3. The supported devices and the API functions needed to use them are described in the following sections. The STK board supports a set of devices which are directly available and mounted on it. The Arduino Uno board supports a set of devices which are directly available and mounted on it.
The following subsections will describe the functions available to control the Arduino Uno Board:. Retrieved from ” http: Views Page Atme, View source History. Personal tools Log in. Contents 1 Introduction 1.