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Changes to support DSD Native mode

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This commit is contained in:
Ross Owen
2013-08-23 14:23:37 +01:00
parent bbb4999318
commit 1e33bf819d
7 changed files with 217 additions and 72 deletions
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39
module_usb_audio/usb_buffer/decouple.xc
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@@ -190,6 +190,7 @@ void handle_audio_request(chanend c_mix_out)
asm("ldw %0, %1[%2]":"=r"(mult):"r"(p_multIn),"r"(i));
{h, l} = macs(mult, sample, 0, 0);
sample = h << 3;
sample |= (l >> 29) & 0x7; // Note, this step is not required if we assume sample depth is 24 (rather than 32)
#elif defined(IN_VOLUME_IN_MIXER) && defined(IN_VOLUME_AFTER_MIX)
sample = sample << 3;
#endif
@@ -296,6 +297,7 @@ void handle_audio_request(chanend c_mix_out)
asm("ldw %0, %1[%2]":"=r"(mult):"r"(p_multOut),"r"(i));
{h, l} = macs(mult, sample, 0, 0);
h <<= 3;
h |= (l >>29)& 0x7; // Note this step is not required if we assume sample depth is 24bit (rather than 32bit)
outuint(c_mix_out, h);
#else
outuint(c_mix_out, sample);
@@ -670,7 +672,7 @@ void decouple(chanend c_mix_out,
/* Pass on to mixer */
DISABLE_INTERRUPTS();
inuint(c_mix_out);
outct(c_mix_out, 9);
outct(c_mix_out, SET_SAMPLE_FREQ);
outuint(c_mix_out, sampFreq);
inOverflow = 0;
@@ -778,6 +780,41 @@ void decouple(chanend c_mix_out,
SET_SHARED_GLOBAL(g_freqChange, 0);
ENABLE_INTERRUPTS();
}
#ifdef NATIVE_DSD
else if(tmp == SET_DSD_MODE)
{
unsigned dsdMode;
DISABLE_INTERRUPTS();
/* Clear the buffer as we dont want to send out old PCM samples.. */
SET_SHARED_GLOBAL(g_freqChange_flag, 0);
GET_SHARED_GLOBAL(dsdMode, g_freqChange_sampFreq); /* Misuse of g_freqChange_sampFreq */
/* Reset OUT buffer state */
SET_SHARED_GLOBAL(g_aud_from_host_rdptr, aud_from_host_fifo_start);
SET_SHARED_GLOBAL(g_aud_from_host_wrptr, aud_from_host_fifo_start);
outUnderflow = 1;
if(outOverflow)
{
/* If we were previously in overflow we wont have marked as ready */
XUD_SetReady_OutPtr(aud_from_host_usb_ep, aud_from_host_fifo_start+4);
outOverflow = 0;
}
inuint(c_mix_out);
outct(c_mix_out, SET_DSD_MODE);
outuint(c_mix_out, dsdMode);
/* Wait for handshake back */
chkct(c_mix_out, XS1_CT_END);
SET_SHARED_GLOBAL(g_freqChange, 0);
asm("outct res[%0],%1"::"r"(buffer_aud_ctl_chan),"r"(XS1_CT_END));
ENABLE_INTERRUPTS();
}
#endif
}
#ifdef OUTPUT