//! The main function
int main(int argc, char *argv[])
{
unsigned int cycle_count;
// Switch to external Oscillator 0.
pm_switch_to_osc0(&AVR32_PM, FOSC0, OSC0_STARTUP);
// Initialize the DSP debug module
dsp_debug_initialization(FOSC0);
// Get the actual cycle count
cycle_count = Get_sys_count();
// Perform a 25-taps FIR
dsp16_filt_fir(y, x, SIZE, fir_coef, FIR_COEF_SIZE);
// Calculate the number of cycles
cycle_count = Get_sys_count() - cycle_count;
// Print the number of cycles
dsp16_debug_printf("Cycle count: %d\n", cycle_count);
// Print the output signal
dsp16_debug_print_vect(y, SIZE - FIR_COEF_SIZE + 1);
while(1);
}
void dac_reload_callback(void)
{
int i;
if (current_stereo_out_buf == stereo_out_buf1)
current_stereo_out_buf = stereo_out_buf2;
else
current_stereo_out_buf = stereo_out_buf1;
generate_signal(signal1_buf, &signal1_generator);
generate_signal(signal2_buf, &signal2_generator);
/* In order for the FIR filter to work correctly we need to keep
* the last part of the previous buffer */
for (i = 0; i < FIR_NUM_COEF; i++) {
signal_pre_filter_buf[i] =
signal_pre_filter_buf[BUFFER_LENGTH + i];
}
/* New data is put in the signal_in_buf which points behind the data
* kept from the previous buffer */
dsp16_vect_add_and_sat(signal_in_buf, signal1_buf, signal2_buf,
BUFFER_LENGTH);
/* Run the FIR filter; the input buffer will be ... longer then the
* output buffer, which has normal length */
if (active_filter > 0) {
dsp16_filt_fir(signal_out_buf, signal_pre_filter_buf,
BUFFER_LENGTH + FIR_NUM_COEF - 1,
filter_coef[active_filter - 1], FIR_NUM_COEF);
} else {
for (i = 0; i < BUFFER_LENGTH; i++)
signal_out_buf[i] = signal_in_buf[i];
}
for (i = 0; i < BUFFER_LENGTH; i++) {
current_stereo_out_buf[i*2] = signal_out_buf[i];
current_stereo_out_buf[i*2+1] = signal_out_buf[i];
}
signals_are_updated = 1;
/* Update PDCA buffer */
tpa6130_dac_output(current_stereo_out_buf, BUFFER_LENGTH);
}
