Armв® Cortex(t... | Embedded Systems: Introduction To

Sometimes, the Watchman needs to move a huge pile of logs (data) from the thermometer to a storage logbook. If he did this himself, he couldn't watch the door. So, he uses his assistant, the Direct Memory Access (DMA) controller. He tells the DMA, "Move these 100 readings to memory and let me know when you're done." The Watchman stays focused on the big picture while the data moves in the background.

The Watchman is incredibly disciplined. He doesn’t spend his time browsing the web or playing games like a "Desktop PC" manager would. Instead, he sits at a small desk with a set of very specific instructions (the Code ) and a tiny bit of scratchpad paper ( RAM ). He is designed to do one thing perfectly: keep that flower alive. Embedded systems: introduction to ARMВ® Cortex(T...

The ARM Cortex-M isn't the fastest brain in the world, but it is the most deterministic . In the world of embedded systems, it’s not about how much you can do—it’s about doing the right thing at the exact right microsecond, every single time, without ever taking a break. Sometimes, the Watchman needs to move a huge