Introducción a DSP

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/* Initialize the board support library, must be first BSL call */
DSK6713_init();
/* Initialize the LED and DIP switch modules of the BSL */
DSK6713_LED_init();
DSK6713_DIP_init();
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IRQ_globalDisable();
// Disable global interrupts during setup
hCodec = DSK6713_AIC23_openCodec(0, &config);
DSK6713_AIC23_setFreq(hCodec,DSK6713_AIC23_FREQ_8KHZ);
initIrq();
IRQ_globalEnable();
void initIrq()
{
/* Enable RXTX interrupts to the CPU */
IRQ_clear(IRQ_EVT_RINT1);
// Clear any pending RX interrupts
IRQ_enable(IRQ_EVT_RINT1);
// Enable RX interrupt
}
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Output = buffer0[buffer0_pos];
buffer0[buffer0_pos] = Channel;
buffer0_pos = (buffer0_pos+1)%buffer_len;
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DSK6713_AIC23_read(hCodec,&Channel);
if (! flag) {
Output = sinetableC0[pos_tbl_c0];
pos_tbl_c0 = (pos_tbl_c0 +1)% SINE_TABLE_SIZE;
} else {
Output = sinetableC1[pos_tbl_c1];
pos_tbl_c1 = (pos_tbl_c1 + 1)% SINE_TABLE_SIZE;
}
flag = !flag;
DSK6713_AIC23_write(hCodec,Output);
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Acumulador=0;
buffer0[0]=Channel;
for (c=buffer_len-1;c--;c>0){
Acumulador += buffer0[c]*coefs_ch0[c];
buffer0[c] = buffer0[c-1];
}
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1
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2
y[n-1]
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y[n-1]
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MULTIPLICADOR
Multiplica los dos valores
8000
Preg
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8000
Acumulador
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0000
Acumulador
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0000
Acumulador
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Mueve resultado a ACC
Suma el resultado dos
veces para compensar
1
K
2 1
Normaliza
desplazando un bit a
la izquierda y elimina
el bit extra
Resultado
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Int32 Acumulador;
Int16 Channel;
Acumulador=0;
buffer0[0]=Channel;
for (c=buffer_len-1;c--;c>0){
Acumulador += buffer0[c]*coefs_ch0[c];
buffer0[c] = buffer0[c-1];
}
Acumulador += buffer0[0]*coefs_ch0[c];
Output = Acumulador>>15;
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