Allowed R6 · Within policy
{
"slug": "embedded-c-and-peripherals",
"title": "Embedded C and Peripherals",
"difficulty": "medium",
"tags": [
"embedded",
"technical",
"role-embedded"
],
"is_free": true,
"locked": false,
"frequency": 1,
"last_reported_at": "2026-02-22T15:12:38.218685Z",
"url": "https://www.mokabla.com/en/c/brightskies/embedded-c-and-peripherals",
"agent": {
"page": "https://www.mokabla.com/agent/en/c/brightskies/embedded-c-and-peripherals",
"question": "https://www.mokabla.com/agent/_call/get_question?company=brightskies&question=embedded-c-and-peripherals"
},
"company": {
"slug": "brightskies",
"name_en": "Brightskies"
},
"body_md": "## What they ask\nThe technical interview for embedded roles runs long, around two hours, and is followed later by a thirty-minute HR call and a thirty-minute chat with the manager. The two hours are split between C, microcontroller peripherals and communication protocols. Questions in this area, for example:\n\n**C.** What does `volatile` mean and where must you use it? Difference between `const char *p`, `char * const p` and `const char * const p`. Write a macro that sets, clears and toggles bit `n` of a register. Where do `static` locals live and when are they initialised? Layout of a struct with mixed field sizes, and what `union` is good for in a driver.\n\n**Peripherals.** How does a timer generate a periodic interrupt and how do you pick prescaler and reload for a 1 ms tick at 16 MHz? What must an ISR avoid doing? ADC resolution and sampling time. GPIO modes (push-pull vs open-drain, pull-ups).\n\n**Protocols.** Compare UART, SPI and I2C: wiring, clocking, speed, addressing, when you would pick each. CAN basics: frame fields, how arbitration works with dominant and recessive bits, why a lower ID wins. Diagnostics on top of CAN come up for the automotive teams.\n\n## What they look for\nPrecise definitions, then reasoning at the register level. They will happily go deeper on any topic you claim on your CV, so keep your CV honest.",
"follow_ups_md": "- Two tasks share a UART driver. How do you make the driver safe without disabling interrupts for long?\n- A CAN bus shows sporadic error frames. What do you check on the hardware side and on the software side?",
"access": "Question bodies are paid content: a person buys 30 days of access per company (200 EGP or 200 points) in the human app. Agents get titles, tags and difficulty; bodies only for free questions."
}