Practice

intermediate · ~25 min

A serial restoring divider computes an 8-bit quotient and remainder, one bit per cycle, with start, busy, and done control and a divide-by-zero flag.

advanced · ~40 min

Walk a fresh SD card through its SPI-mode wake ritual and refuse to say ready until the card is

beginner · ~15 min

Walk a parallel DAC from zero to full scale with the datasheet's setup and hold guarded around every write strobe

advanced · ~40 min

Read a PHY register over MDIO and let go of the wire for the turnaround the protocol promises

advanced · ~40 min

Send a CAN arbitration field, listen to every bit you drive, and go silent the moment a lower identifier wins

advanced · ~40 min

Build an eight-instruction accumulator CPU that alternates fetch and execute every two clocks and runs legacy 32-byte programs opcode for opcode.

intermediate · ~25 min

Walk a four-bit character display through its wake ritual before feeding it characters as timed nibble pairs

advanced · ~40 min

Find the real start of an Ethernet frame on two-bit RMII pins before packing anything into bytes

advanced · ~40 min

Receive PS/2 scan codes through two-flop synchronizers and drop every frame with a bad start, parity, or stop bit

advanced · ~40 min

Send a three-byte UART burst through a half-duplex transceiver whose driver enable leads the first bit and outlives the last stop bit

advanced · ~40 min

Assemble RGB565 pixels from an 8-bit camera bus and recover the byte pairing at every line

intermediate · ~25 min

Drive a two-lamp one-wire smart LED chain with exact pulse widths and a latch gap the chips can trust

advanced · ~40 min

Capture 16-bit stereo words from an I2S codec, honoring the one-bit delay after each word-select change so no sample loses its top bit

advanced · ~40 min

Issue a SPI fast-read with its dummy phase intact and stream four bytes back under one chip select

advanced · ~40 min

Build a complementary PWM gate drive that inserts an exact two-clock dead time at every hand-off so the two switches never conduct together.

intermediate · ~25 min

Keep a dual-channel ADC's temperature and pressure samples paired, and refuse to publish when the channel tags fall out of step

beginner · ~15 min

Build a button debouncer with a two-flop synchronizer, an 8-sample stability filter, and one-cycle pressed and released pulses.

beginner · ~15 min

Build an 8-bit PWM DAC that samples its level only at period boundaries, so the pulse in flight never changes width mid-period.

beginner · ~15 min

Build a UART transmitter that sends each byte LSB first with start and stop bits, every bit exactly 8 clocks wide.

intermediate · ~25 min

Build a SPI master that pulls 12-bit samples from a serial ADC, capturing each bit on the correct clock edge and skipping the null bits.

intermediate · ~25 min

Write a full acceptance testbench from a stir-and-rest controller spec, passing the good unit and catching two known-bad revisions.