add more atmel studio framework code

watch-library/hal/documentation/flash.rst

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+The Flash Driver
+================
+
+Flash is a re-programmable memory that retains program and data
+storage even with power off.
+
+User can write or read several bytes from any valid address in a flash.
+
+As to the erase/lock/unlock command, the input parameter of address should
+be a bytes address aligned with the page start, otherwise, the command will fail
+to be executed. At the meantime, the number of pages that can be locked or unlocked
+at once depends on region size of the flash. User can get the real number
+from the function return value which could be different for the different devices.
+
+Features
+--------
+
+* Initialization/de-initialization
+* Writing/Reading bytes
+* Locking/Unlocking/Erasing pages
+* Notifications about errors or being ready for a new command
+
+Applications
+------------
+
+* Mini disk which can retain program and data storage
+* Boot loader
+* Non volatile storage
+
+Dependencies
+------------
+
+The peripheral which controls a re-programmable flash memory.
+
+Concurrency
+-----------
+
+N/A
+
+Limitations
+-----------
+
+User should pay attention to set a proper stack size in their application,
+since the driver manages a temporary buffer in stack to cache unchanged data
+when calling flash write and erase function.
+Due to flash memory architecture of SAMD21/D20/L21/L22/C20/C21/D09/D10/D11/R21,
+write operation erazes row content before each write.
+
+Known issues and workarounds
+----------------------------
+
+N/A

watch-library/hal/documentation/rand_sync.rst

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+==========================================
+Random Number Generator Synchronous driver
+==========================================
+
+Random Number Generator (RAND) generates a sequence of numbers that can not
+be reasonably predicted better than by a random chance.
+
+In some implementation cases, seed is required for the Random Number Generator
+to generate random numbers. rand_sync_set_seed is used to update the seed.
+If it's actually not required by the generator implementation, the function just
+returns ERR_UNSUPPORTED_OP.
+
+Features
+--------
+
+* Initialization and de-initialization
+* Enabling and Disabling
+* Setting seed
+* 8-bit and 32-bit random data/data array generation
+
+Applications
+------------
+
+* Generate random keys for data encryption
+
+Dependencies
+------------
+
+* Random number generation hardware/software
+
+Concurrency
+-----------
+N/A
+
+Limitations
+-----------
+
+N/A
+
+Known issues and workarounds
+----------------------------
+N/A
+

watch-library/hal/documentation/spi_master_sync.rst

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+The SPI Master Synchronous Driver
+=================================
+
+The serial peripheral interface (SPI) is a synchronous serial communication
+interface.
+
+SPI devices communicate in full duplex mode using a master-slave
+architecture with a single master. The master device originates the frame for
+reading and writing. Multiple slave devices are supported through selection
+with individual slave select (SS) lines.
+
+Features
+--------
+
+* Initialization/de-initialization
+* Enabling/disabling
+* Control of the following settings:
+
+  * Baudrate
+  * SPI mode
+  * Character size
+  * Data order
+* Data transfer: transmission, reception and full-duplex
+
+Applications
+------------
+
+Send/receive/exchange data with a SPI slave device. E.g., serial flash, SD card,
+LCD controller, etc.
+
+Dependencies
+------------
+
+SPI master capable hardware
+
+Concurrency
+-----------
+
+N/A
+
+Limitations
+-----------
+
+The slave select (SS) is not automatically inserted during read/write/transfer,
+user must use I/O to control the devices' SS.
+
+Known issues and workarounds
+----------------------------
+
+N/A
+

watch-library/hal/documentation/usart_sync.rst

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+The USART Synchronous Driver
+============================
+
+The universal synchronous and asynchronous receiver and transmitter
+(USART) is usually used to transfer data from one device to the other.
+
+User can set action for flow control pins by function usart_set_flow_control,
+if the flow control is enabled. All the available states are defined in union
+usart_flow_control_state.
+
+Note that user can set state of flow control pins only if automatic support of
+the flow control is not supported by the hardware.
+
+Features
+--------
+
+* Initialization/de-initialization
+* Enabling/disabling
+* Control of the following settings:
+
+  * Baudrate
+  * UART or USRT communication mode
+  * Character size
+  * Data order
+  * Flow control
+* Data transfer: transmission, reception
+
+Applications
+------------
+
+They are commonly used in a terminal application or low-speed communication
+between devices.
+
+Dependencies
+------------
+
+USART capable hardware.
+
+Concurrency
+-----------
+
+Write buffer should not be changed while data is being sent.
+
+
+Limitations
+-----------
+
+* The driver does not support 9-bit character size.
+* The "USART with ISO7816" mode can be only used in ISO7816 capable devices. 
+  And the SCK pin can't be set directly. Application can use a GCLK output PIN
+  to generate SCK. For example to communicate with a SMARTCARD with ISO7816
+  (F = 372 ; D = 1), and baudrate=9600, the SCK pin output frequency should be
+  config as 372*9600=3571200Hz. More information can be refer to ISO7816 Specification.
+
+Known issues and workarounds
+----------------------------
+
+N/A