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Hi , I'm sorry if someone has already asked this question. I'm having a problem using the codec program. I want to do a simple function of outputting a cosine with frequency component of 1000Hz. The problem is when I monitor the signal using oscilloscope , the waveform doesn't even look like a sinusoid. I'm sure somebody else has encountered this problem before, please tell me what is wrong. Here is my simple code. Thanking you in advance. #include <type.h> #include <board.h> #include <codec.h> #include <mcbsp54.h> #include <stdio.h> #include <math.h> #include <stdlib.h> #include <std.h> #include <dsplib.h> #include <tms320.h> #define PI 3.14159265 HANDLE hHandset; int out1=0; void main() { int i; int out2=0; float sin_value2[16]={0}; short fmtQ15[16]={0}; for(i=0;i<16;i++){ sin_value2[i]=cos(2*PI*1000*i*1/8000); } hHandset = codec_open(HANDSET_CODEC); codec_dac_mode(hHandset, CODEC_DAC_15BIT); codec_adc_mode(hHandset, CODEC_ADC_15BIT); codec_ain_gain(hHandset, CODEC_AIN_0dB); codec_aout_gain(hHandset, CODEC_AOUT_MINUS_0dB); codec_sample_rate(hHandset,SR_8000); for(out1=0;out1<10000;out1++){ fltoq15(sin_value2,fmtQ15,16); for(out2=0;out2<16;out2++){ *(volatile u16*)DXR1_ADDR(HANDSET_CODEC)=fmtQ15[out2]; } } return; } li UTM Malaysia |
incorrect signal output using codec
Started by ●November 14, 2002
