Editing Multi-purpose Embedded System
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==Hardware Architecture== | ==Hardware Architecture== | ||
[[Image:Mpes hw archi.png]] | [[Image:Mpes hw archi.png]] | ||
| − | + | *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 | |
| − | + | **EEPROM for small block of re-writable data | |
| − | *Use serial bus (I2C/SPI) to expand data memory to save I/O pins | + | **Flash for large block of re-writable data |
| − | *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 | |
| − | + | **GPIB for automated test equipment | |
| − | *RS232 for short distance communication with PC | + | *User Interface |
| − | *RS485 for longer distance communication | + | **Graphical displays (LCD, VFD, etc.) |
| − | *USB for USB communication with PC | + | **Keypad for input |
| − | *Ethernet for Internet connectivity | + | *Sensory Control |
| − | * | + | **ADC for analog feedback signals |
| − | + | **DAC for analog control signals | |
| − | *GPIB for automated test equipment | + | **GPIO for digital feedback and control signals |
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| − | *Graphical displays (LCD, VFD, etc.) | ||
| − | *Keypad for input | ||
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| − | *ADC for analog feedback signals | ||
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| − | *DAC for analog control signals | ||
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| − | *GPIO for digital feedback and control signals | ||
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Hardware | UART | ADC | DAC | NVM | PWM | ... | TIMERS | | Hardware | UART | ADC | DAC | NVM | PWM | ... | TIMERS | | ||
+------+-----+-----+-----+-----+-----+----------+ | +------+-----+-----+-----+-----+-----+----------+ | ||
| − | * | + | *The task scheduler is based on [http://www.freertos.org/ FreeRTOS] V4.1.3 incorporating coroutine developed by [http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html Simon Tatham]. The scheduler API is wrapped by the [http://www.die.net/doc/linux/man/man2/ POSIX] Thread API. |
| + | **e.g. pthread_create(), usleep(), etc. | ||
| + | *Software drivers are developed to allow users at Application Level to use the hardware (e.g. ADC, DAC, UART, NVM etc) through the [http://www.die.net/doc/linux/man/man2/ POSIX] System call API. | ||
| + | **e.g. open(), write(), read(), ioctl(), lseek(), etc. | ||
| + | *The most up-to-date development can be found at repository [http://chungyan5.no-ip.org/vc/?root=freertos_posix freertos_posix] | ||
===GUI=== | ===GUI=== | ||
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+---------------+----------------+ | +---------------+----------------+ | ||
User Applications | Application 1 | Application 2 | | User Applications | Application 1 | Application 2 | | ||
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Drivers & Scheduler | Display | Pointer | Keypad | Task Scheduler | | Drivers & Scheduler | Display | Pointer | Keypad | Task Scheduler | | ||
+-----------+-----------+----------+----------------+ | +-----------+-----------+----------+----------------+ | ||
| + | *See [http://chungyan5.no-ip.org/wiki/index.php/UI here] for description | ||
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| Server | | | Resolver | | | | | | | Server | | | Resolver | | | | | | ||
+--------+------+------+----------+------+----+ | | | +--------+------+------+----------+------+----+ | | | ||
| − | Socket API | | + | Socket API | Linux-like Socket | | | |
| − | + | +---------------------------------------------+ | | | |
| − | TCP/IP Stack | | + | TCP/IP Stack | uip | | | |
| − | + | +---------------------------------------------+ | | | |
| − | | | + | | Ethernet Controller | | | |
| − | + | +--------------------------------------+------+--------------------+-------+ | |
| − | POSIX API | | + | POSIX API | POSIX System Calls | POSIX Threads | |
| − | +---------- | + | +--------------------------------------+-----------------------------------+ |
| Drivers | Task Scheduler | | | Drivers | Task Scheduler | | ||
| − | +---------- | + | +--------------------------------------+-----------------------------------+ |
| − | + | *See [http://www.opencircuits.com/Ethernet_Module here] for description | |
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| − | *See [ | ||
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