错误 __builtin_avr_delay_cycles expects an integer constant.
经过查找发现是头文件版本更新所致。delay.h文件214行说明如下：
Note: The new implementation of _delay_us(double __us) with
__builtin_avr_delay_cycles(unsigned long) support is not backward compatible.
User can define __DELAY_BACKWARD_COMPATIBLE__ to get a backward compatible delay.
Also, the backward compatible
algorithm will be chosen if the code is compiled in a freestanding
environment (GCC option \c -ffreestanding), as the math functions
required for rounding are not available to the compiler then.
这样解决方法就明显了，新的定义和之前的不兼容，
因此调用延时文件#include 之前加入#define __DELAY_BACKWARD_COMPATIBLE__ 即可。
例如：
#define F_CPU 8000000UL
#include
#define __DELAY_BACKWARD_COMPATIBLE__
#include
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