Simple Multitask Schedule core for Atmega AVR

在野火开发板上实现基于freeRTOS的多任务，包括USART,ADC采集，LED-multitask realization on wildfire board based on freeRTOS.Tasks include ADC ,UASRT,LED。

stm32 开发板上的freeRTOS移植。实现了ADC,usart,LCD,跑马灯多任务切换。点击按键，LCD会有不同的图形显示。-Running multitask in freeRTOS on wildfire board 。By pushing key-button,graphs on ILI9341 LCD change,while an UASRT task sends the ADC value to PC.