void sound_init()
{
// Initialise the hardware. We make use of the SSC module.
sound_interrupt_disable();
sound_disable();
*AT91C_PMC_PCER = (1 << AT91C_ID_SSC);
*AT91C_PIOA_ODR = AT91C_PA17_TD;
*AT91C_PIOA_OWDR = AT91C_PA17_TD;
*AT91C_PIOA_MDDR = AT91C_PA17_TD;
*AT91C_PIOA_PPUDR = AT91C_PA17_TD;
*AT91C_PIOA_IFDR = AT91C_PA17_TD;
*AT91C_PIOA_CODR = AT91C_PA17_TD;
*AT91C_PIOA_IDR = AT91C_PA17_TD;
*AT91C_SSC_CR = AT91C_SSC_SWRST;
*AT91C_SSC_TCMR = AT91C_SSC_CKS_DIV + AT91C_SSC_CKO_CONTINOUS + AT91C_SSC_START_CONTINOUS;
*AT91C_SSC_TFMR = 31 + (7 << 8) + AT91C_SSC_MSBF; // 8 32-bit words
*AT91C_SSC_CR = AT91C_SSC_TXEN;
aic_mask_on(AT91C_ID_SSC);
aic_clear(AT91C_ID_SSC);
aic_set_vector(AT91C_ID_SSC, AT91C_AIC_PRIOR_LOWEST | AT91C_AIC_SRCTYPE_INT_EDGE_TRIGGERED,
(U32)sound_isr_entry); /*PG*/
sample.buf_id = 0;
sample.cur_vol = -1;
sample.sample_buf = NULL;
}
void sound_toggle(void) {
#ifdef Z80_EMULATED
//puts("sound_toggle");
if (!(sound_muted&0x2))
{
if (sound_muted&0x1)
sound_enable();
else
sound_disable();
}
#endif
}
void sound_isr_C()
{
//U64 s = systick_get_ns();
if (sample.count > 0)
{
// refill the buffer, and adjust any clocks
*AT91C_SSC_CMR = sample.clock_div;
sound_enable();
if (*AT91C_SSC_TCR == 0)
{
if (sound_mode == SOUND_MODE_PCM)
{
sound_fill_sample_buffer();
*AT91C_SSC_TPR = (unsigned int)sample.buf[sample.buf_id];
}
else
*AT91C_SSC_TPR = (unsigned int)sample.ptr;
*AT91C_SSC_TCR = sample.len;
sample.count--;
}
if (sound_mode == SOUND_MODE_PCM)
{
sound_fill_sample_buffer();
*AT91C_SSC_TNPR = (unsigned int)sample.buf[sample.buf_id];
}
else
*AT91C_SSC_TNPR = (unsigned int)sample.ptr;
*AT91C_SSC_TNCR = sample.len;
sample.count--;
// If this is the last sample wait for it to complete, otherwise wait
// to switch buffers
sound_interrupt_enable(AT91C_SSC_ENDTX);
}
else
{
sound_disable();
sound_interrupt_disable();
}
//ttime += (systick_get_ns() - s);
}
