* * Base Commit for SAMG55J19. No errors and no implementations.

* * Added gpio files.

* * Added pinmap files.

* * Base commit for usticker implementation.

* * Added gcc_arm export functionality

* * added files for usticker.
* added template file for samd55j19

* * GPIO IRQ base commit.

* * updated with changes in gpio irq driver.

* * Reverted back unexpected commit in SAM0 gpio driver.

* * updated gpio_irq driver.

* * correction in gpio and gpio_irq drivers.
* added support for some test for gpio.

* * base commit for peripheralpins for usart.
* update in serial apis.

* * updated serial apis.

* * updated serial apis and test.

* * update serial apis for asynch apis.

* * updated peripheral pins for i2c and spi.
* added test support for serial flow control

* * Base commit for low power ticker implementation.

* * base commit for port apis.
* update in lp ticker apis.

* * Added test support for port.

* * base commit for sleep apis.

* * Base commit for spi.

* * updated with corrections in gpio irq.
* usticker file updated with latest source.

* * updated with corrections for unexpected board reset.
* updated gpio irq apis and added test for the same.

* * updated sleep api for deepsleep.

* * updated serial apis.

* Added uc_ticker and SPI api implementations

* Removed unused SPI pin map

* Updated review feedback

* * implemented lpticker with TC module.
* updated files for KnR Coding Statndard.
* updated serial and usticker apis.

* * Base commit for AnalogueIn apis.

* * RTC apis base commit without implementation.

* * Updated with corrections in lpticker implementations.

* * Added implementation for rtc apis.

* * updated with implementations for pwm.
* changed usticker from TC0 to TC1.

* Added I2C support

* * removed setvector usage from usticker and lpticker implementations
* added tests for SAMG55J19

* * Removed unwanted .o and .d files.
* Updated I2C files for KnR Coding Standards.
* Update for reducing compiler warnings in peripheralpins,c
* Updated with PWM free implementation.

* * Removed unwanted headers file inclusion.
* Compiler warning corrections in serial_api.c

* * Updated ADC with 16 bit mode initialization and code refinements.
* Updated PWM with code refinements.

* Updated I2C review feedback and fixed style

* Updated target name for SAMG55

* * Added Test Support for I2C with AT30TSE75X and Added Support for SAMG55J19 in atmelstudio project exporter

* * Added Test Support for I2C with AT30TSE75X and Added Support for SAMG55J19 in atmelstudio project exporter

* Used NVIC_SetVector for interrupt callback

* Removed Target macro define in test

* Updated test cases to have SAMG55 support

* * Updated with corrections in Serial and SPI asynchronous implementations.
* Updated deepsleep api implementation
* Merged LP_Ticker with latest code from mbed 3.0 repository.

* * updated with corrections in I2C Asynch implementation.