TMS320F28335: 使用官方的FIR32_ALT滤波结果不正确，求助各位我哪里配置的有问题吗？

Guangming Li

Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

使用官方给的“Example_F335_FixedPoint_FIR32_Alt”例程数据与滤波系数，滤波结果正常，因为这个例程的滤波阶数是43阶，我将滤波阶数提高到319阶时，滤波结果完全不正确。但是自己写一个卷积和滤波是正常的。

谁有这方面的经验的大神，感谢帮忙指正一下，还望不吝赐教，感谢！

3 年多前

0 Ben Qin 3 年多前

TI__Mastermind 39885 points

你好，感谢您对TI产品的关注！为了更好的解决您的问题，我将向更了解这款芯片的TI资深工程师咨询，一旦有回复会立即回复给您。

0 Ben Qin 3 年多前

TI__Mastermind 39885 points

你好，方便提供一下输入数据吗？使用库函数时的输入和您使用自己写的函数时的输入是一样的吗，如果两者不一样请都提供一下。

0 Guangming Li 3 年多前回复 Ben Qin

使用库函数输入和自己写的函数输入是一样的

10Hz数据

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25Hz数据

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-12214,
-12516,
-12746,
-12903,
-13012,
-13049,
-13019,
-12920,
-12772,
-12548,
-12253,
-11908,
-11502,
-11036,
-10511,
-9942,
-9325,
-8648,
-7935,
-7177,
-6394,
-5573,
-4723,
-3858,
-2961,
-2056,
-1146,
-217,
712,
1622,
2539,
3440,
4310,
5183,
6021,
6821,
7589,
8325,
9020,
9665,
10259,
10804,
11297,
11733,
12108,
12432,
12687,
12871,
13002,
13070,
13061,
12992,
12857,
12664,
12399,
12073,
11692,
11247,
10749,
10197,
9596,
8936,
8246,
7508,
6729,
5921,
5089,
4221,
3333,
2432,
1522,
600,
-332,
-1243,
-2161,
-3068,
-3954,
-4826,
-5676,
-6496,
-7271,
-8020,
-8733,
-9397,
-10007,
-10580,
-11096,
-11547,
-11949,
-12293,
-12569,
-12787,
-12936,
-13029,
-13041,
-12999,
-12889,
-12716,
-12479,
-12180,
-11822,
-11399,
-10917,
-10390,
-9802,
-9165,
-8493,
-7773,
-7006,
-6206,
-5386,
-4534,
-3644,
-2753,
-1849,
-923,
-5,
919,
1836,
2748,
3641,
4520,

滤波系数

-2,
-1,
-1,
-2,
-2,
-3,
-3,
-4,
-4,
-5,
-5,
-6,
-7,
-8,
-9,
-10,
-11,
-12,
-13,
-14,
-15,
-16,
-17,
-18,
-19,
-20,
-21,
-22,
-23,
-24,
-24,
-25,
-25,
-25,
-25,
-25,
-24,
-23,
-22,
-21,
-19,
-17,
-15,
-12,
-9,
-6,
-3,
1,
6,
10,
15,
20,
26,
32,
38,
44,
50,
57,
64,
70,
77,
84,
90,
97,
103,
109,
115,
120,
125,
130,
134,
137,
140,
142,
143,
144,
143,
142,
140,
136,
132,
127,
121,
113,
105,
96,
85,
74,
61,
48,
34,
19,
3,
-14,
-31,
-49,
-67,
-85,
-104,
-123,
-142,
-161,
-179,
-197,
-215,
-232,
-249,
-265,
-279,
-293,
-305,
-316,
-326,
-334,
-341,
-346,
-349,
-350,
-350,
-347,
-343,
-336,
-328,
-318,
-306,
-292,
-276,
-258,
-238,
-217,
-194,
-170,
-145,
-118,
-91,
-62,
-33,
-3,
27,
58,
89,
119,
149,
179,
208,
236,
264,
290,
314,
338,
359,
379,
397,
413,
427,
439,
448,
456,
460,
463,
463,
460,
456,
448,
439,
427,
413,
397,
379,
359,
338,
314,
290,
264,
236,
208,
179,
149,
119,
89,
58,
27,
-3,
-33,
-62,
-91,
-118,
-145,
-170,
-194,
-217,
-238,
-258,
-276,
-292,
-306,
-318,
-328,
-336,
-343,
-347,
-350,
-350,
-349,
-346,
-341,
-334,
-326,
-316,
-305,
-293,
-279,
-265,
-249,
-232,
-215,
-197,
-179,
-161,
-142,
-123,
-104,
-85,
-67,
-49,
-31,
-14,
3,
19,
34,
48,
61,
74,
85,
96,
105,
113,
121,
127,
132,
136,
140,
142,
143,
144,
143,
142,
140,
137,
134,
130,
125,
120,
115,
109,
103,
97,
90,
84,
77,
70,
64,
57,
50,
44,
38,
32,
26,
20,
15,
10,
6,
1,
-3,
-6,
-9,
-12,
-15,
-17,
-19,
-21,
-22,
-23,
-24,
-25,
-25,
-25,
-25,
-25,
-24,
-24,
-23,
-22,
-21,
-20,
-19,
-18,
-17,
-16,
-15,
-14,
-13,
-12,
-11,
-10,
-9,
-8,
-7,
-6,
-5,
-5,
-4,
-4,
-3,
-3,
-2,
-2,
-1,
-1,
-2,

0 Ben Qin 3 年多前回复 Guangming Li

TI__Mastermind 39885 points

你好，对于常数系数数组、它们是否采用与示例相同的格式、使用反向顺序？

0 Guangming Li 3 年多前回复 Ben Qin

系数使用了与实例相同的格式，没有进行反向顺序。因为系数表数据本来就是对称的。另外FIR32也不需要系数排序。

0 Ben Qin 3 年多前回复 Guangming Li

TI__Mastermind 39885 points

你好，我需要一些时间来进一步研究这个问题,因为我以前没有使用任何定点库功能的经验。我会尽快回来,但可能需要一段时间。

0 Ben Qin 3 年多前回复 Guangming Li

TI__Mastermind 39885 points

抱歉由于美国那边节日假期，支持该问题的工程师休假了，下周他将返工，届时他将跟进您的问题，抱歉给您造成不便。

0 Ben Qin 3 年多前回复 Guangming Li

TI__Mastermind 39885 points

你好，我运行 C2000Ware 中提供的示例并尝试将滤波器阶数从43更改为319，在对照检查时没有任何错误。使用您的数据后我也出现了相同的问题，当然结果图表并不是完全一样。我将尝试与其他人确认这种情况的原因，看看他们是否知道；我将在本周晚些时候尝试作出回应。

同时，我查看了您之前发送的输入数据，并在 CCS 中绘制了类似的波浪形图，这是您所期望的吗？

0 Guangming Li 3 年多前回复 Ben Qin

你这个是我给你的两个频率的输入波形叠加在一起的吗？我是不叠加测试的。

0 Ben Qin 3 年多前回复 Guangming Li

TI__Mastermind 39885 points

你好，我没有将它们叠加，我只是将它们加载到存储器中并使用 CCS 的图形工具绘制它们的图形。在 Excel 中，它看起来很正常，因此可能只是图形设置不正确。当我在 Excel 中对10Hz 信号的输出进行图形化时，我会得到下图。我仍在等待我的联系人查看他们是否对结果如此奇怪的原因有任何了解，所以请让我等到本周结束，以获得回复。

0 Ben Qin 3 年多前回复 Guangming Li

TI__Mastermind 39885 points

你好，如果您查看 C2000Ware 中的2833x_FixedPoint_FIR32_Alt 示例，您将看到输入和滤波器系数幅度远大于您的示例使用的幅度。我想知道库是否会因为这个原因而出现精度问题。也许您可以尝试将所有值(输入和系数)按固定值(例如32768)进行缩放，然后看有什么样的反应。

另一种可能，虽然可能性很小，是 dbuff (历史缓冲区)的大小问题，您已将其定义为512，远远大于滤波器的阶数(319)。我相信只需要320。我不认为这应该是一个问题，因为循环缓冲区应该在达到所需大小循环而不是定义的大小。但是可以试着检查一下。

但首先我会检查量级问题。我比较怀疑这个，因为与预期输出相比，库生成的输出在量级上也非常小。

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TMS320F28335: 使用官方的FIR32_ALT滤波结果不正确，求助各位我哪里配置的有问题吗？