DSP21375 FIR output a wrong results ,some elements are incorrect

hello all :

My test is use dsp21375 to generate a 1khz signal at Sample rate 96khz (A array named "input" ,which have 192 elements);

When i use FIR (use visual dsp ++5.5 lib ) function to test the input ,and it output a wrong results .

The fir have 80 taps,pass band 10khz and stop band 15khz ,signal degradation :80db.

Test input line plot:

FIR test output line plot:

The No.0 to 39 elements incorrect,and the No.152 to 191 elements are missing!

The FIR fuction returns a "state" array,what can i do somthing to avoid error whith it?

Software :

#define TAPS 80

#define fs 96000

#define pi 3.14159

float input[fir_SAMPLES];// FIR INPUT

float output[fir_SAMPLES];//OUTPUT

float dm state[TAPS+1];

const pm float coeffs[TAPS]=

{

-0.00142993104524,-0.003289811986829,-0.005282332460651, -0.0075069448623,

-0.00833784587848,-0.007776107140672,-0.005016122768101,-0.001099967770155,

0.003213643962488, 0.006016725367764, 0.006414789515753, 0.003780666676801,

-0.0007747690201561,-0.005593084934047,-0.008292796716591,-0.007474471569354,

-0.002894142730604, 0.00370558678562, 0.009576439183326, 0.01170483457889,

0.008546757383277, 0.000697116076388,-0.008783990634843, -0.01564147328494,

-0.01604979055559,-0.008671667639916, 0.004414367121836, 0.01793968257963,

0.02542079739782, 0.0218443329146, 0.006360386319139, -0.01649993681243,

-0.03756126656446, -0.04588317097792, -0.03271438997146, 0.004775757393522,

0.06159175162126, 0.1256310834033, 0.181053268937, 0.2131620859593,

0.2131620859593, 0.181053268937, 0.1256310834033, 0.06159175162126,

0.004775757393522, -0.03271438997146, -0.04588317097792, -0.03756126656446,

-0.01649993681243, 0.006360386319139, 0.0218443329146, 0.02542079739782,

0.01793968257963, 0.004414367121836,-0.008671667639916, -0.01604979055559,

-0.01564147328494,-0.008783990634843, 0.000697116076388, 0.008546757383277,

0.01170483457889, 0.009576439183326, 0.00370558678562,-0.002894142730604,

-0.007474471569354,-0.008292796716591,-0.005593084934047,-0.0007747690201561,

0.003780666676801, 0.006414789515753, 0.006016725367764, 0.003213643962488,

-0.001099967770155,-0.005016122768101,-0.007776107140672, -0.00833784587848,

-0.0075069448623,-0.005282332460651,-0.003289811986829, -0.00142993104524

};

for (i = 0; i < TAPS+1; i++) state[i] = 0;

// 1Khz 192 elements

for(i=0;i<fir_SAMPLES;i++)

{

*(input+i) =0.5*sinf(2*pi*1000*(i)/fs);

}

// FIR TEST Process No. 0 to 191 elements

fir (input, output, coeffs, state, fir_SAMPLES, TAPS);