Clock Stretching
Clock Stretching is a core part of I²C. Learn what the hardware or software block does, what inputs and outputs it has, how firmware configures or uses it, and how to verify the resulting behavior on the target system.
ARCHITECTURE
Identify the block, clock/source dependencies, data path and interfaces.
CONFIGURE
Follow the target reference manual and change only documented fields.
VERIFY
Define the expected register state, timing or signal before running the test.
DEBUG
Inspect software state and measure hardware behavior rather than guessing.
From manual to measurement
- Read the architecture/reference-manual section.
- Identify clocks, pins, memory, interrupts and dependencies.
- Calculate required timing or configuration values.
- Implement the smallest working configuration.
- Build with warnings enabled and flash the target.
- Inspect registers and measure the external behavior.
- Document failures, assumptions and the final fix.
KEY TAKEAWAY
Clock Stretching is a core part of I²C. Learn what the hardware or software block does, what inputs and outputs it has, how firmware configures or uses it, and how to verify the resulting behavior on the target system.