Drivers that are initialized

• Minimal, Polling UART0 initialized @ 38400 BPS
• RTC
• ADC
• SPI0, SPI1
• I2C2

Other items that are setup

• PLL Setup according to desired CPU speed set @ sys_config.h
• Flash Acceleration setup according to CPU frequency
• FreeRTOS fully setup, just need to create tasks and start FreeRTOS scheduler
• Attempt is made to mount SD Card & Flash Memory, so File IO is ready

The following resources are setup before main() is called

• System Tick Interrupt is setup for FreeRTOS
• Timer1 is enabled to to provide system timer services that also helps capture IR signal. Timer1 also services the mesh networking task if FreeRTOS is not running. *

Layer 0 sets up the following items

• Setup the System Memory and CPU Clock
• Initialize minimal UART0 (polling version) for standard I/O
• Make a call to high_level_init() followed by call to main()
• This layer also contains the processor memory map file

Layer 1 provides the FreeRTOS API

• Some source code is optimized and improved to provide better information.

Layer 2 provides the System Drivers

• All of your drivers should be placed in this layer.
• Base classes for UART and I2C are present to help write drivers for additional UARTs

Layer 3 provides Utility functions and classes

• Utility functions contain embedded tweaks for String and Vector class
• Other classes include LOGGER, Command Handler, and FreeRTOS wrapper around Timers

Layer 4 provides gateway to the SJ One Board IO that includes

• FAT File System to access SD Card and on-board Flash Memory
• Nordic wireless API also exists at this layer
• Storage class that allows to format and get information about SD and Flash Memory
• Acceleration, IR, Temperature, and Light Sensors
• LED Display, LEDs, and Switches class

Layer 5 is where your application code should go including

• FreeRTOS Tasks
• High level code that interacts with lower layers