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VSF -- Versaloon Software Framework

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Full name of VSF is "Versaloon Software Framework". VSF is an open-source software framework for embedded applications based on Apache2 license. VSF includes hal, a pre-emptive multi-thread kernel, services and components. VSF is implemented by C language with object-oriented programming methods(PLOOC).

Overall Framework

Catalogue

Kernel

Pre-emptive kernel based on event-driven architecture, supporting mcs51, 8bit MCU, 32/64 bit ARM, riscv, x86, etc.

• event-driven architecture, sleep if no event occurred, lower-power naturally
• in pre-emptive mode, task switch is implemented by hardware swi(software interrupt), priority of task is the priority of the swi.
• pre-emptive scheduling for tasks with different priority, collaborative scheduling for tasks with the same priority
• can run in other RTOS as a task, or as swi ISR
• different tasks
  • event handler task -- minimum resources usage, 20 bytes ram usage for minimum configuration, 40 bytes ram usage for normal configuration
  • pt task
  • thread with dedicated stack -- depending on setjmp in libc
  • fsm task
  • other tasks in shell, eg pthread
• IPC: semaphore, mutex, trigger, queue, etc

Components

• Reasonable framework for code re-use
• declarative development model
• standard interface, standard port for 3rd-party components
• software components
  • distbus -- distributed bus framework
  • fifo
  • heap
  • json
  • pool
  • stream
  • trace
• Components
  • fs -- filesystem with vfs support
  • input -- input sub-system
  • mal -- memory abstraction layer(normally known as 'block' device)
  • scsi -- SCSI device
  • tcpip -- TCPIP stack and netdrv drivers
  • ui -- UI and display drivers
  • usb -- USB host/slave stacks
  • bt -- bt stack(using btstack)

HAL -- hardware abstraction layer

• standard hal interface and API -- eg: vsf_spi_init can be used with hardware SPI, GPIO emulated SPI, SPI from external usb device, etc
• IP core driver -- simplify porting by implement clock, reset, interrupt functions which is not provided by IP core
• template for different intefaces and functionalities
• interfaces
  • PM
  • GPIO
  • SPI
  • I2C
  • PWM
  • ADC
  • SWI
  • USART
  • FLASH
  • USB
  • ethernet

Shell

To use applications from other system, shell can be used.

• SDL -- use applications based on SDL directly
• linux -- use applications based on linux directly
  • posix
  • devfs
  • socket
  • console
  • libraries
    • libusb
    • libgen
    • libsdl2
    • libcurl
    • etc

3rd-party