Final answer:
The major disadvantage of wiring SPI devices in daisy chain is that if one device fails or is disconnected, it can disrupt communication with all the devices connected after it. This can render the entire daisy chain unreliable or non-functional.
Step-by-step explanation:
The major disadvantage of wiring SPI (Serial Peripheral Interface) devices in daisy chain is that if one device in the chain fails or is disconnected, it can disrupt communication with all the devices connected after it. This means that if there is an issue with one device, it can render the entire daisy chain unreliable or non-functional.
For example, let's say you have four SPI devices wired in a daisy chain: Device A, Device B, Device C, and Device D. If Device B fails or is disconnected, the communication between Device A and Device C will be disrupted, and you will not be able to communicate with Device C or Device D.
This disadvantage can be mitigated by using a different wiring configuration, such as a star topology, where each device is connected directly to a central controller. However, this may require more wiring and can be more complex to implement.