Skill Profile

SPI / I2C / UART Protocols

Hardware protocols: SPI, I2C, UART, timing, pull-ups, bus arbitration

Embedded & IoT Hardware Interfaces

Roles

where this skill appears

Levels

structured growth path

Mandatory requirements

the other 2 optional

Embedded & IoT

Hardware Interfaces

3/17/2026

Choose your current level and compare expectations. The items below show what to cover to advance to the next level.

What is Expected at Each Level

The table shows how skill depth grows from Junior to Principal. Click a row to see details.

Role	Required	Description
Embedded Developer	Required	Understands the fundamentals of SPI / I2C / UART Protocols. Applies basic practices in daily work. Follows recommendations from the team and documentation.
IoT Engineer		Connects sensors and actuators to MCU via I2C and UART. Understands basic protocol principles: I2C addressing, UART baud rate. Uses logic analyzer for debugging.

Role	Required	Description
Embedded Developer	Required	Independently implements SPI/I2C/UART drivers: DMA transfers, error handling, multi-slave bus management. Debugs communication issues using logic analyzer.
IoT Engineer		Develops drivers for SPI/I2C/UART devices in IoT projects. Configures DMA for high-speed SPI exchange. Diagnoses bus issues with Saleae/Wireshark.

Role	Required	Description
Embedded Developer	Required	Designs high-performance communications: multi-slave SPI with chip select mux, I2C bus recovery, UART with custom protocol and CRC.
IoT Engineer	Required	Designs hardware abstraction layer for SPI/I2C/UART in IoT platform. Optimizes bus throughput and ensures thread-safe access from RTOS tasks. Implements sensor hot-plug.

Role	Required	Description
Embedded Developer	Required	Defines communication protocol standards for the platform. Establishes unified driver architecture for SPI/I2C/UART, conducts driver reviews.
IoT Engineer	Required	Defines hardware interface standards for the IoT product line. Establishes reference designs and reusable driver libraries for the team.

Role	Required	Description
Embedded Developer	Required	Shapes communication bus strategy: defines unified driver architecture across products, establishes bus performance standards, creates reference implementations for new MCU platform bring-up.
IoT Engineer	Required	Defines enterprise hardware interfaces strategy for IoT. Evaluates new protocols (I3C, SPI Quad) for next generation. Builds platform driver architecture.

Junior 2 requirements

Embedded Developer
Required

Understands the fundamentals of SPI / I2C / UART Protocols. Applies basic practices in daily work. Follows recommendations from the team and documentation.
IoT Engineer

Connects sensors and actuators to MCU via I2C and UART. Understands basic protocol principles: I2C addressing, UART baud rate. Uses logic analyzer for debugging.

Middle 2 requirements

Embedded Developer
Required

Independently implements SPI/I2C/UART drivers: DMA transfers, error handling, multi-slave bus management. Debugs communication issues using logic analyzer.
IoT Engineer

Develops drivers for SPI/I2C/UART devices in IoT projects. Configures DMA for high-speed SPI exchange. Diagnoses bus issues with Saleae/Wireshark.

Senior 2 requirements

Embedded Developer
Required

Designs high-performance communications: multi-slave SPI with chip select mux, I2C bus recovery, UART with custom protocol and CRC.
IoT Engineer
Required

Designs hardware abstraction layer for SPI/I2C/UART in IoT platform. Optimizes bus throughput and ensures thread-safe access from RTOS tasks. Implements sensor hot-plug.

Lead / Staff 2 requirements

Embedded Developer
Required

Defines communication protocol standards for the platform. Establishes unified driver architecture for SPI/I2C/UART, conducts driver reviews.
IoT Engineer
Required

Defines hardware interface standards for the IoT product line. Establishes reference designs and reusable driver libraries for the team.

Principal 2 requirements

Embedded Developer
Required

Shapes communication bus strategy: defines unified driver architecture across products, establishes bus performance standards, creates reference implementations for new MCU platform bring-up.
IoT Engineer
Required

Defines enterprise hardware interfaces strategy for IoT. Evaluates new protocols (I3C, SPI Quad) for next generation. Builds platform driver architecture.

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