Part 4 – Applying Timeouts in Peripheral Drivers

In Part 3, we built a minimal timeout API in C: a small struct with a deadline, a start function, and an expired() check. Now it’s time to put this API to work.

In this article, we’ll apply timeouts to common embedded peripheral drivers—UART, I²C, and SPI. These peripherals are at the heart of most embedded applications, and without timeouts, they are also common sources of hangs. By the end, you’ll see how adding a timeout layer turns fragile drivers into robust ones.

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