I have been using winavr as the avr development tool before. Versions after AVRstudio 5 directly include the GCCAVR tool chain. The development environment has also changed a lot. Overall, it is still very powerful, so I have been following the version updates. The original program cannot be compiled by directly copying it. The most common error is this:
错误 __builtin_avr_delay_cycles expects an integer constant.
After searching, it was found that it was caused by the header file version update. The description of line 214 of the delay.h file is as follows:
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.
The solution is obvious. The new definition is incompatible with the previous one, so just add define __DELAY_BACKWARD_COMPATIBLE__ before calling the header file.
Finally, I have to sigh that AVR is out of date and has no advantages anymore. I don't need to consider 8-bit AVR for future projects. The emulator is still so expensive. Alas.
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