LOGIC ANALYZER & SCOPE FIELD GUIDE FOR EMBEDDED FIRMWARE: Decode SPI, I2C, UART, and CAN Bus Signals to Fix Hardware-Software Protocol Bugs (The Embedded Debugging & Diagnostic Series)
Why does an SPI device work perfectly at low speed but fail when the clock frequency increases? Why does an I C bus suddenly become stuck with SDA held low? Why does UART communication work on one board but produce corrupted packets on another? What causes a CAN network to enter Bus-Off when the firmware appears to be working correctly? And when a failure could be caused by hardware, timing, signal integrity, or firmware, how do you find the real cause?
Stop guessing at embedded communication problems. Learn to see them.
Firmware does not operate in isolation. Every software decision eventually appears as a physical signal-a clock, pulse, voltage transition, acknowledgment, frame, or timing relationship on a wire. When something goes wrong, an oscilloscope and logic analyzer can reveal what a software debugger cannot.
Logic Analyzer & Scope Field Guide for Embedded Firmware is a practical guide to using measurement tools to diagnose real hardware-software failures in embedded systems.
The book begins with essential measurement and signal fundamentals. Learn when to use an oscilloscope versus a logic analyzer, how probe connections affect measurements, how logic thresholds work across common voltage levels, and how to use triggering techniques to capture elusive faults.
You will then investigate the physical causes behind intermittent communication failures, including ringing, overshoot, undershoot, slow rise times, ground bounce, power-rail sag, crosstalk, and PCB coupling.
The book takes you deep into four essential embedded communication interfaces:
UARTDecode frames and investigate baud-rate mismatch, clock drift, flow-control problems, framing errors, RS-232 and RS-485 signaling, and driver-enable timing.
I CAnalyze START and repeated-START conditions, addressing, ACK/NACK behavior, clock stretching, arbitration, pull-up requirements, and stuck-bus conditions. Learn practical bus-recovery techniques and how to verify them with measurement tools.
SPIUnderstand the four SPI clock modes and diagnose CPOL/CPHA errors, chip-select timing violations, setup and hold-time problems, shared-bus contention, and high-speed data corruption.
CANExamine differential signaling, termination, frame structure, arbitration, bit stuffing, CRC, acknowledgment, error states, and Bus-Off conditions to identify both physical-layer and protocol-level failures.
The book goes beyond protocol decoding by showing how to connect physical signals to firmware execution. Learn to use GPIO instrumentation, timing measurements, ISR and task markers, protocol-to-code correlation, and cross-triggering between analog and digital measurements.
Real-world case studies demonstrate how to investigate problems such as intermittent flash corruption, stuck I C buses, RS-485 packet truncation, corrupted SPI displays, CAN Bus-Off failures, and unexpected delays in motor-control systems.
The reference section provides protocol formulas, probing checklists, hardware-debugging guidance, and Python-based logic-analyzer scripting techniques to extend your diagnostic capabilities.
Whether you are an embedded firmware engineer, hardware engineer, robotics developer, IoT developer, automotive or industrial engineer, or engineering student, this field guide will help you develop a critical debugging skill:
Don't just ask what the firmware is supposed to do. Measure what the hardware is actually doing.
Capture the signal. Decode the evidence. Find the fault. Fix the system.
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