Hi, I am a student. More than a year ago i used to work with Atmega 32 by using C. By including a header file i used to deal directly with the registers names . Currently I am working with HiFive 1 rev B. And i having an issue to deal directly with any registers such as input_value or output_ value. What i should do to overcome this issue. Also, is there any materials that explain Hifive1 revB in more details than the manual. Thanks very much in advance.