1. Enable the required peripheral modules in app_config.h, see the instructions in app_config.h for details
2. Configure touch channels in tk_cfg_user.h
3. Configure touch parameters in tk_cfg.h
4. Add user logic code in user_code.c
   user_init()     User initialization function
   user_loop()     Tasks to be done in the user main loop
   user_timer()    User timer, timing period is set by SYSTICK
5. When ADC sampling is required, process ADC data in ADC_Callback(). This function will be called back after ADC sampling is completed
