static void pssj_callback(void *p)
{
pssj_t *pssj = (pssj_t *)p;
int data;
pssj_update(pssj);
if (pssj->ctrl & 2)
{
if ((pssj->ctrl & 3) == 3)
{
data = dma_channel_read(1);
if (data != DMA_NODATA)
{
pssj->dac_val = data & 0xff;
// pclog("DAC_val=%02x\n", data);
}
}
else
{
data = dma_channel_write(1, 0x80);
}
if ((data & DMA_OVER) && data != DMA_NODATA)
{
// pclog("Check IRQ %i %02x\n", pssj->irq, pssj->ctrl);
if (pssj->ctrl & 0x08)
{
pssj->irq = 1;
pssj_update_irq(pssj);
}
}
}
else
{
switch (pssj->wave & 0xc0)
{
case 0x00: /*Pulse*/
pssj->dac_val = (pssj->wave_pos > (pssj->pulse_width << 1)) ? 0xff : 0;
break;
case 0x40: /*Ramp*/
pssj->dac_val = pssj->wave_pos << 3;
break;
case 0x80: /*Triangle*/
if (pssj->wave_pos & 16)
pssj->dac_val = (pssj->wave_pos ^ 31) << 4;
else
pssj->dac_val = pssj->wave_pos << 4;
break;
case 0xc0:
pssj->dac_val = 0x80;
break;
}
pssj->wave_pos = (pssj->wave_pos + 1) & 31;
}
pssj->timer_count += (int)(TIMER_USEC * (1000000.0 / 3579545.0) * (double)(pssj->freq ? pssj->freq : 0x400));
}
static void pssj_get_buffer(int32_t *buffer, int len, void *p)
{
pssj_t *pssj = (pssj_t *)p;
int c;
pssj_update(pssj);
for (c = 0; c < len * 2; c++)
buffer[c] += pssj->buffer[c >> 1];
pssj->pos = 0;
}
