From c0c2687135013a6d656bd98b92d9d09dd666dfdc Mon Sep 17 00:00:00 2001
From: liuyihui <liuyihui02@gmail.com>
Date: Mon, 24 Apr 2023 21:07:51 +0800
Subject: [PATCH] feat: hanning17

---
 include/fft/table.h |  1 +
 src/fft/fft.c       | 14 +++++++-------
 src/fft/table.c     |  4 ++++
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/include/fft/table.h b/include/fft/table.h
index 855f04b..6a89254 100644
--- a/include/fft/table.h
+++ b/include/fft/table.h
@@ -2,6 +2,7 @@
 
 #include "fft.h"
 
+extern const q15_t hanning_17[];
 extern const q15_t hanning_160[];
 
 extern const uint16_t bitrevTable[];
diff --git a/src/fft/fft.c b/src/fft/fft.c
index 1dcdefb..71d4f76 100644
--- a/src/fft/fft.c
+++ b/src/fft/fft.c
@@ -8,6 +8,8 @@
 #define Re(x) 2 * x
 #define Im(x) 2 * x + 1
 
+static q15_t res[N * 2];
+
 static inline void bitreversal(q31_t *data) {
     q31_t tmp;
     uint16_t n1 = N >> 1;
@@ -83,16 +85,14 @@ static inline void butterfly(q15_t *data) {
 }
 
 int FFT(q15_t *data) {
-    q15_t out[N * 2];
-
     for (uint16_t i = 0; i < N; i++) {
-        out[Re(i)] = data[i];  // real
-        out[Im(i)] = 0;        // imaginary
+        res[Re(i)] = data[i];  // real
+        res[Im(i)] = 0;        // imaginary
     }
 
-    butterfly(out);
-    bitreversal((q31_t *)out);
-    for (uint16_t i = 0; i < N; i++) data[i] = (q15_t)abs(out[2 * i]);
+    butterfly(res);
+    bitreversal((q31_t *)res);
+    for (uint16_t i = 0; i < N; i++) data[i] = (q15_t)abs(res[Re(i)]);
 
     return 0;
 }
diff --git a/src/fft/table.c b/src/fft/table.c
index 4cb20a8..142667d 100644
--- a/src/fft/table.c
+++ b/src/fft/table.c
@@ -1,5 +1,9 @@
 #include "fft/table.h"
 
+const q15_t hanning_17[] = {
+    0, 1247, 4799, 10114, 16384, 22654, 27969, 31521, 32767, 31521, 27969, 22654, 16384, 10114, 4799, 1247, 0,
+};
+
 const q15_t hanning_160[] = {
     0,     13,    51,    115,   204,   319,   458,   623,   812,   1025,  1263,  1524,  1808,  2115,  2444,  2795,
     3167,  3560,  3973,  4405,  4856,  5325,  5811,  6314,  6832,  7366,  7913,  8474,  9047,  9631,  10226, 10831,