You then use register 127 as your loop counter and register 126 as your base pointer, and perform convert_to_upper on each value until you get to the end of the buffer.
然后再将寄存器127用作循环计数器，将寄存器126用作基指针，并在每个值上执行convert _ to_upper，直到到达缓冲区的底部为止。
If the protocol stack wants to update a register value because a write register function was received a buffer with the new register values is passed to the callback function.
如果协议栈收到了一个写寄存器命令，将会执行寄存器更新操作，一个包含新寄存器数值的缓冲区会传给回调函数。
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