BS814A-2 and BS818A-2 library

<br /> !!!! I Don't Writen FreeRTOS and BS818A-2 Yet !!!! <br /> I hope use it and enjoy. <br /> I use Stm32f0k6 and Keil Compiler and Stm32CubeMX wizard. <br /> Please Do This ... <br /> <br /> 1) Select "General peripheral Initalizion as a pair of '.c/.h' file per peripheral" on project settings. <br /> 2) Select 1 pin as gpio output for Clock and 1 pin as gpio input for Data. <br /> 3) Config your Bs81x_Conf.h. <br /> 4) After Bs81x_Init() you can call Bs81x_Scan(). return -1 if no key pressed.