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QuestionMy GLINK USB 2.0 extension cable isn't detecting External Hard Drive, though Pen drive is detected. How do I make sure the EHD is detected? Pin
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AnswerRe: Serial port takes a long time to respond Pin
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AnswerRe: Serial port takes a long time to respond Pin
Patrice T5-Jul-20 0:53
mvePatrice T5-Jul-20 0:53 
Member 14809996 wrote:
The response from the micro should be pretty fast, its running at a baudrate of 115200, meaning the whole 512 kb file should in theory take just over 30 seconds to complete, at the moment it is more than double that, at 80 seconds.

You missed a couple things:
- In serial communications, every byte is preceded by at least a start bit and a stop bit, other settings like parity can add other delay. This make at least 10 bits for a byte transmitted, this make sending 512kB just under 45 secondes at 100% efficient.
- Any operation like reading the 512kB from storage will add delay.
- Any one serious with serial communication, for such a file, will encapsulate the data within a communication protocol to ensure data is not corrupted on the other side. This imply mode data to transmit and some time to ensure data integrity.
So 80 secondes is not that bad.

“Everything should be made as simple as possible, but no simpler.” Albert Einstein

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