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Now, I want to know the start address and length of "_DATA_GROUP_", How can I do it, thanks.
Managed to press end a bit early...
Was about to write:
If someone asks: How can I switch tires on my car without need for loosening the bolts, the suggestion could be to build a machine that can remove and fit tires - and balance the wheels - while the rim is still mounted on the car. That is a very expensive solution if the OPs original problem just was that he had lost his wrench.
Let's assume that someone is spending a lot of time figuring out how to use ultrasonic sound to upgrade the firmware in an application, to avoid the need to opening the case. If the box already has an external serial port, it might be a better suggestion to ask why the serial port isn't used - since a ultrasonic solution would require special hardware to perform the update.
If someone is all set on trying to get an embedded processor to generate a 10MHz fixed-frequency signal out from an ISR (even if that is expected to consume more than 100% of the processor capacity), it might be better to suggest a cheap external crystal oscillator.
Don't take this wrong, but only a fool would unconditionally try to answer questions. Suggesting solutions is easy. Trying to figure out the original problem is the hard part.