Difference between revisions of "MotionSystem"
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===FPGA Firmware=== | ===FPGA Firmware=== | ||
| − | For basics about FPGA on Armadeus board, please consult [[FPGA]] | + | For basics about FPGA on Armadeus board, please consult [[FPGA]]. |
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The FPGA firmware is located in the fpgaFirmware directory of the main archive file of the project (see above). The following files form the FPGA firmware: | The FPGA firmware is located in the fpgaFirmware directory of the main archive file of the project (see above). The following files form the FPGA firmware: | ||
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====How to build the FPGA Firmware:==== | ====How to build the FPGA Firmware:==== | ||
| + | The Xilinx ISE® WebPACK™ design software | ||
===Linux Kernel Driver=== | ===Linux Kernel Driver=== | ||
Revision as of 08:20, 18 June 2009
Contents
Project Description
The application field of this project is robotic.
The goal of this project is to provide a R/C Servos Controller to manage R/C by different ways, and a motion measurement system via accelerometers.
The project is composed by different componants:
- A hardware board on which are plugged R/C servos, accelerometers and ADC multiplexers.
- A FPGA firmware which manages R/C servo at low level (Already written, thanks to Sonzerro and Fabien Marteau).
- A Linux Kernel Driver which manages the FPGA Firware, the ADC multiplexers and ADC Max1027.
- A user space daemon which manages the driver and listen on TCP port to accept remote commands from the network.
- A user desktop application which sends commands to the daemon.
Texte italique
Participating Armadeus members
- Yvan ROCH
Project data
Introduction
Overall original objectives of the project have not been reached. The following functionality are not implemented:
- The accelerometers and ADC multiplexers are under development (hardware, driver and user application).
- The board is available in schematic form. No PCB layout.
The following functionality are implemented:
- A FPGA firmware which manages R/C servo at low level.
- A Linux Kernel Driver which manages the FPGA Firware.
- A user space daemon which manages the driver and listen on TCP port to accept remote commands from the network.
- A user desktop application which sends commands to the daemon.
Project Files
All the necessary files are available in an archive under the following URL: Project Files
Hardware Board
The board contains the logic and voltage level adaptation to drive the R/C servos. As already said, the is no PCB layout.
The schematic is available in the file...
The schematic was design with Eagle available at the following URL: Eagle
FPGA Firmware
Linux Kernel Driver
User Space Daemon
User GUI Application
How to use the project
Introduction
The main goal of this project is to develop a system to manage motion on robotic platform. Finally only the subsystem that manages R/C servos is achieved. The MotionSystem can manage up to 32 R/C servos. R/C servos are a good solution to the moving issue on a small robotic platform. Hobbyist robotic platform like Lynxmotion Robots (http://www.lynxmotion.com) use many R/C servos.
R/C Servo
A description (in French) of such R/C servo can be found at http://fribotte.free.fr. R/C servo needs a pulse-width modulated (PWM) signal to manage his angular position. This signal looks like this:
Basically, it is possible to generate this signal with a GPIO pin controlled by Linux kernel code. But this solution has three major drawbacks:
- The true concurrency is impossible, R/C servo signal are not synchronous
- The delays of PWM signal (between 0.5 ms and 2.5 ms) are mandatory implemented with busy waiting (udelay Linux kernel function) to give the necessary accuracy. It is very processor time consuming.
- Due to the intrinsic non real time characteristic of the Linux kernel, the accuracy of the delays are impassible on a heavy loaded system. This causes R/C servo jittering (When a R/C servo jitters, it seems to have Parkinson's disease... Jitter
For these reasons, the subsystem that generates PWM signals is implemented in the FPGA. In a FPGA, true concurrency is feasible, no processor time is used and timings are very strict.
MotionSystem Architecture
The MotionSystem architecture is describe in the following diagram:
Hardware Board
FPGA Firmware
For basics about FPGA on Armadeus board, please consult FPGA.
The FPGA firmware is located in the fpgaFirmware directory of the main archive file of the project (see above). The following files form the FPGA firmware:
SERVO_top.vhd: This is the main module.
COUNTER.vhd: This module is a 16 bits counter at 4 MHz used by all the PWM modules.
RESET_MODULE.vhd: This module is a cold start reset generator.
pwm_module.vhd: This module generates the PWM output.
servo.ucf: Signals/pins mapping file.
How to build the FPGA Firmware:
The Xilinx ISE® WebPACK™ design software
