GCC ARM-inline-asm

http://www.ethernut.de/en/documents/arm-inline-asm.html

 

一个例子:

TRIMBYTE(dst, src) __asm__ __volatile__("USAT %[dstr] , #8, %[srcr]": [dstr] "=r" (dst) : [srcr] "r" (src));

 

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