| Latest revision |
Your text |
| Line 1: |
Line 1: |
| − | This project intends to provide ideas and technical information to create a multi-purpose embedded system.
| + | ==Architecture== |
| − | *Information contained in this wiki should be as generic as possible (unless otherwise stated) so that the ideas and information can be portable to different hardware (e.g. 8-bit/16-bit/32-bit MCU).
| |
| − | *The peripheral devices should be expandable
| |
| | | | |
| − | ==Hardware Architecture== | + | ===Hardware=== |
| | [[Image:Mpes hw archi.png]] | | [[Image:Mpes hw archi.png]] |
| − | | + | *MCU |
| − | ===MCU===
| + | **MCU can be 8-bit/16-bit/32-bit |
| − | *MCU can be 8-bit/16-bit/32-bit | + | **MCU should have sufficient RAM (i.e. no external RAM required) |
| − | *MCU should have sufficient RAM (i.e. no external RAM required) | + | **MCU should have program Flash (i.e. no external program flash required) |
| − | *MCU should have program Flash (i.e. no external program flash required) | + | *Data Memory |
| − | | + | **Use serial bus (I2C/SPI) to expand data memory to save I/O pins |
| − | | + | **Need a file system to access the data |
| − | ===Data Memory===
| + | **EEPROM has a higher endurance (typically 10,000 cycles) for saving frequently write data |
| − | *Use serial bus (I2C/SPI) to expand data memory to save I/O pins | + | **Flash has a lower endurance (typically < 10,000 cycles) for saving less frequently write data (may not be true, to be confirmed) |
| − | *Need a file system to access the data | + | *Communication |
| − | *EEPROM for small block of re-writable data | + | **RS232 for short distance one-to-one communication with PC |
| − | *Flash for large block of re-writable data | + | **RS485 for longer distance networked communication |
| − | | + | **USB for USB communication with PC |
| − | | + | **Ethernet for Internet connectivity |
| − | ===Communication===
| + | **GPIB for automated test equipment |
| − | *RS232 for short distance communication with PC | + | *User Interface |
| − | *RS485 for longer distance communication (upto 1200m) over a set of devices | + | **Graphical displays (LCD, VFD, etc.) |
| − | *USB for USB communication with PC | + | **Keypad for input |
| − | *Ethernet for Internet connectivity | + | *Sensory Control |
| − | **Use of Ethernet controller (e.g. [http://www.davicom.com.tw/userfile/24247/DM9000A-DS-F01-101906.pdf DM9000A] (requiring software TCP/IP stack) | + | **ADC for analog feedback signals |
| − | **User of TCP/IP chip (e.g. [http://www.wiznet.co.kr/ W5300])
| + | **DAC for analog control signals |
| − | *GPIB for automated test equipment | + | **GPIO for digital feedback and control signals |
| − | | |
| − | | |
| − | ===User Interface===
| |
| − | *Graphical displays (LCD, VFD, etc.) | |
| − | *Keypad for input | |
| − | | |
| − | | |
| − | ===Sensory Control===
| |
| − | *ADC for analog feedback signals | |
| − | **Requires anti-aliasing analog filters and op-amp circuits | |
| − | ***Use desktop software (e.g. [http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en010007 FilterLab]) to design circuits
| |
| − | **May incorporate [http://www-users.cs.york.ac.uk/~fisher/mkfilter/ digital filter] to improve reduce noise
| |
| − | *DAC for analog control signals | |
| − | **Refer to [[Modulation_Plugin | here]] if modulation is needed. | |
| − | *GPIO for digital feedback and control signals | |
| − | **Option 1: directly controlled by MCU
| |
| − | **Option 2: indirectly through D-type flip-flops (e.g. [http://www.datasheetcatalog.org/datasheet/philips/74lv574.pdf 74LV574]) for low pin counts MCU
| |
| − | **Option 3: indirectly through shift register flip-flops (e.g. [http://www.standardics.nxp.com/products/lv/datasheet/74lv165.pdf 74LV165] for input, [http://www.datasheetcatalog.org/datasheet/texasinstruments/tpic6595.pdf TPIC6595] or [http://www.nxp.com/acrobat_download/datasheets/74LV595_3.pdf 74LV595] for output ) for extremely low pin count MCU
| |
| − | | |
| − | | |
| − | ==Software Architecture==
| |
| − | | |
| − | ===RTOS===
| |
| − | +-----------+-----------+----------------------------------------------+
| |
| − | Application | Task 1 | Task 2 | ... |
| |
| − | +-----------+-----------+------------+----------------------+----------+
| |
| − | Standard API | POSIX System Call | POSIX Thread | C-Lib |
| |
| − | +------------------+-----------------+----------------------+----------+
| |
| − | Kernel | Power Management | | Task Scheduler |
| |
| − | +------------------+ +----------+-----------+
| |
| − | | Drivers | FreeRTOS | Coroutine |
| |
| − | +------+-----+-----+-----+-----+-----+----------+-----------+
| |
| − | Hardware | UART | ADC | DAC | NVM | PWM | ... | TIMERS |
| |
| − | +------+-----+-----+-----+-----+-----+----------+
| |
| − | *See [[Freertos_posix_Development | here]] for description
| |
| − | | |
| − | | |
| − | ===GUI===
| |
| − | +---------------+----------------+
| |
| − | User Applications | Application 1 | Application 2 |
| |
| − | | +----------------+------------------+
| |
| − | Middlewares | | Toolkits | Window Manager |
| |
| − | +---------------+----------------+------------------+
| |
| − | GUI Library | Graphics Engine (inc Font) |
| |
| − | +-----------+----------------------+----------------+
| |
| − | POSIX API | | POSIX System Calls | POSIX Threads |
| |
| − | | +-----------+----------+----------------+
| |
| − | Drivers & Scheduler | Display | Pointer | Keypad | Task Scheduler |
| |
| − | +-----------+-----------+----------+----------------+
| |
| − | | |
| − | | |
| − | ===TCP/IP Stack===
| |
| − | +---------------------------------------------+--------------------+-------+
| |
| − | Applications | Ethernet Application | GUI Application | ... |
| |
| − | +--------+------+------+----------+------+----+ | |
| |
| − | Web Libraries | Web | DHCP | SNMP | DNS | SMTP |... | | |
| |
| − | | Server | | | Resolver | | | | |
| |
| − | +--------+------+------+----------+------+----+ | |
| |
| − | Socket API | Linux Socket Wrapper | | |
| |
| − | | +----------------------------------+ | |
| |
| − | TCP/IP Stack | | uip | | |
| |
| − | | +----------------------------------+ | |
| |
| − | | | Ethernet Thread | | |
| |
| − | | +---------------------------+------+--------------------+-------+
| |
| − | POSIX API | | POSIX System Calls | POSIX Threads |
| |
| − | +----------+---------------------------+-----------------------------------+
| |
| − | | Drivers | Task Scheduler |
| |
| − | +----------+---------------------------+-----------------------------------+
| |
| − | | H/W |
| |
| − | | TCP/IP |
| |
| − | | Stack |
| |
| − | +----------+
| |
| − | *See [[Ethernet_Module | here]] for description
| |
| − | | |
| − | | |
| − | ===File System===
| |
| − | +------------+------------+------------+------------+------------+------------+
| |
| − | Application | App 1 | App 2 | App 3 | App 4 | App 5 | App 6 |
| |
| − | +------------+------+-----+------------+------------+------------+------------+
| |
| − | POSIX API | POSIX System Calls | POSIX Threads |
| |
| − | +--------------------+ | |
| |
| − | | FatFs Wrapper | | |
| |
| − | +--------------------+ | |
| |
| − | File System | FatFs | | |
| |
| − | +--------+-----+-----+-----------------+--------------------------------------+
| |
| − | | EEPROM | MMC | USB | Drivers | Task Scheduler |
| |
| − | +--------+-----+-----+-----------------+--------------------------------------+
| |
| − | *See [[MMC_Card_Reader | here]] for description
| |
| − | | |
| − | [[category:projects]]
| |
