同样的代码，在5535上就可以实现fft，但是到了5517就不行了，
rom的地址也改过了，改为
/* HWAFFT Routines ROM Addresses */
_hwafft_br = 0x00fefefc;
_hwafft_8pts = 0x00feff10;
_hwafft_16pts = 0x00feffff;
_hwafft_32pts = 0x00ff0155;
_hwafft_64pts = 0x00ff045e;
_hwafft_128pts = 0x00ff05f3;
_hwafft_256pts = 0x00ff0804;
_hwafft_512pts = 0x00ff0a02;
_hwafft_1024pts = 0x00ff0c7c;
还有哪些需要注意的吗
