BlackBerry Embedded Software Engineering Intern interview questions

Got a phone call from the HR manager & he asked about few stuffs in the resume. He scheduled a technical round on the immediate next day. A senior level engineer called me & asked questions regarding auto-interrupts, external interrupts, SPI, UART & DAC. He also asked some questions in C about linked list & structures. Asked few questions from RTOS, difference between semaphore & mutex, scheduler & stack, frame pointers.