在ST更新STM32 DSP库之前，需要用到256点和1024点FFT运算的同学，不妨用以下的补丁打上。
1. 现有的DSP库函数中，64点FFT是正确的。
2. 256/1024点需要更改以下几个地方
(1)NPT的定义
IAR assembly file: #define NPT 64 => #define NPT 256/1024
Keil assembly file: NPT EQU 64 => NPT EQU 256/1024
RIDE assembly file: .equ NPT, 64 => .equ NPT, 256/1024
(2)修改一些汇编代码
IAR assembly file:
BUTFLY4ZERO_OPT MACRO pIN,offset, pOUT
LDRSH Ai, [pIN, #2]
LDRSH Ar, [pIN],#NPT
LDRSH Ci, [pIN, #2]
LDRSH Cr, [pIN],#NPT
LDRSH Bi, [pIN, #2]
LDRSH Br, [pIN],#NPT
LDRSH Di, [pIN, #2]
LDRSH Dr, [pIN],#NPT
改成:
BUTFLY4ZERO_OPT MACRO pIN,offset, pOUT
LDRSH Ai, [pIN, #2]
LDRSH Ar, [pIN]
ADD pIN, pIN, #NPT
LDRSH Ci, [pIN, #2]
LDRSH Cr, [pIN]
ADD pIN, pIN, #NPT
LDRSH Bi, [pIN, #2]
LDRSH Br, [pIN]
ADD pIN, pIN, #NPT
LDRSH Di, [pIN, #2]
LDRSH Dr, [pIN]
ADD pIN, pIN, #NPT
Keil assembly file:
MACRO
BUTFLY4ZERO_OPT $pIN,$offset, $pOUT
LDRSH Ai, [$pIN, #2]
LDRSH Ar, [$pIN],#NPT
LDRSH Ci, [$pIN, #2]
LDRSH Cr, [$pIN],#NPT
LDRSH Bi, [$pIN, #2]
LDRSH Br, [$pIN],#NPT
LDRSH Di, [$pIN, #2]
LDRSH Dr, [$pIN],#NPT
改成:
MACRO
BUTFLY4ZERO_OPT $pIN,$offset, $pOUT
LDRSH Ai, [$pIN, #2]
LDRSH Ar, [$pIN]
ADD $pIN, #NPT
LDRSH Ci, [$pIN, #2]
LDRSH Cr, [$pIN]
ADD $pIN, #NPT
LDRSH Bi, [$pIN, #2]
LDRSH Br, [$pIN]
ADD $pIN, #NPT
LDRSH Di, [$pIN, #2]
LDRSH Dr, [$pIN]
ADD $pIN, #NPT
RIDE assembly file:
preloop_v7:
ADD r14, r1, r12, LSR#24 /*256pts*/
LDRSH r5, [r14, #2]
LDRSH r4, [r14],#NPT
LDRSH r9, [r14, #2]
LDRSH r8, [r14],#NPT
LDRSH r7, [r14, #2]
LDRSH r6, [r14],#NPT
LDRSH r11, [r14, #2]
LDRSH r10, [r14],#NPT
改成：
preloop_v7:
ADD r14, r1, r12, LSR#24 /*256pts*/
LDRSH r5, [r14, #2]
LDRSH r4, [r14]
ADD r14, #NPT
LDRSH r9, [r14, #2]
LDRSH r8, [r14]
ADD r14, #NPT
LDRSH r7, [r14, #2]
LDRSH r6, [r14]
ADD r14, #NPT
LDRSH r11, [r14, #2]
LDRSH r10, [r14]
ADD r14, #NPT
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