Editing Multi-purpose Embedded System
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**May incorporate [http://www-users.cs.york.ac.uk/~fisher/mkfilter/ digital filter] to improve reduce noise | **May incorporate [http://www-users.cs.york.ac.uk/~fisher/mkfilter/ digital filter] to improve reduce noise | ||
*DAC for analog control signals | *DAC for analog control signals | ||
− | **Refer to [ | + | **Refer to [http://www.opencircuits.com/Modulation_Plugin here] if modulation is needed. |
*GPIO for digital feedback and control signals | *GPIO for digital feedback and control signals | ||
**Option 1: directly controlled by MCU | **Option 1: directly controlled by MCU | ||
− | **Option 2: indirectly through D-type flip-flops (e.g. [http://www.datasheetcatalog.org/datasheet/philips/74lv574.pdf | + | **Option 2: indirectly through D-type flip-flops (e.g. [http://www.datasheetcatalog.org/datasheet/philips/74lv574.pdf 74LV154]) for low pin counts MCU |
− | **Option 3: indirectly through shift register flip-flops (e.g. [http://www. | + | **Option 3: indirectly through shift register flip-flops (e.g. [http://www.datasheetcatalog.com/datasheets_pdf/M/7/4/H/M74HC165.shtml 74HC165] for input, [http://www.datasheetcatalog.org/datasheet/texasinstruments/tpic6595.pdf TPIC6595] or [http://www.datasheetcatalog.org/datasheet/philips/74HC_HCT595_CNV_3.pdf 74HC595] for output ) for extremely low pin count MCU |
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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] 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] | ||
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| Stack | | | Stack | | ||
+----------+ | +----------+ | ||
− | *See [ | + | *See [http://www.opencircuits.com/Ethernet_Module here] for description |
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Application | App 1 | App 2 | App 3 | App 4 | App 5 | App 6 | | Application | App 1 | App 2 | App 3 | App 4 | App 5 | App 6 | | ||
+------------+------+-----+------------+------------+------------+------------+ | +------------+------+-----+------------+------------+------------+------------+ | ||
− | + | Standard Lib | Stdio.h wrapper | | | | |
− | + | + | +-------------------+ | | |
− | + | File System | FatFs | | POSIX Threads | | |
− | + | + | | +--------+ | | |
− | + | POSIX API | | POSIX System Calls | | | |
− | +--------+----- | + | +----------+---------------------------+--------------------------------------+ |
− | | | + | | Drivers | Task Scheduler | |
− | +-------- | + | +--------------------------------------+--------------------------------------+ |
− | *See [ | + | *See [{{SERVER}}/MMC_Card_Reader here] for description |
+ | |||
[[category:projects]] | [[category:projects]] |