It was relatively short. The interviewer asked me to tell them about myself, and then they told me about the position and the product the department is developing. Then, they asked me one question.

He asked to write a function in C that reads an index from memory and turns on the relevant bits in the relevant registers, meaning to read a GPIO index from OTP and set it to high.

• 0 - tri-state

• 1 - GPIO_MODE_IN

• 2 - GPIO_MODE_OUT

• [1:0] - GPIO1

• [5:4] - GPIO2

• [9:8] - GPIO3

#define reg_gpio_mode_sel

bool NVM_read_block(uint32_t address_in_bytes, uint8_t* buffer, uint32_t size_in_bytes);

In OTP: byte 112 contains:

• [3:0] - gpio index
• [7:4] - override gpio index (if not zero, use instead of lower nibble)