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Feedback calc allows a couple of extra bits for the multiplication to allow for a better range of mclk/samplerate combos

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This commit is contained in:
Ross Owen
2015-11-11 14:16:03 +00:00
parent ee40514079
commit 3da6a51d5f
2 changed files with 6 additions and 4 deletions
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9
module_usb_audio/endpoint0/audiorequests.xc
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@@ -319,7 +319,10 @@ int AudioClassRequests_2(XUD_ep ep0_out, XUD_ep ep0_in, USB_SetupPacket_t &sp, c
i_tmp = MCLK_441;
}
setG_curSamFreqMultiplier(g_curSamFreq/(i_tmp/512));
unsigned mult = (g_curSamFreq*512*4)/i_tmp;
setG_curSamFreqMultiplier(mult);
asm("ecallf %0"::"r"(mult));
#ifdef ADAT_RX
/* Configure ADAT SMUX based on sample rate */
outuint(c_clk_ctl, SET_SMUX);
@@ -854,7 +857,6 @@ int AudioClassRequests_2(XUD_ep ep0_out, XUD_ep ep0_in, USB_SetupPacket_t &sp, c
maxFreq = MAX_FREQ_FS;
}
#endif
while(1)
{
if((currentFreq44 <= maxFreq) && (currentFreq44 >= MIN_FREQ))
@@ -1083,8 +1085,7 @@ int AudioEndpointRequests_1(XUD_ep ep0_out, XUD_ep ep0_in, USB_SetupPacket_t &sp
i_tmp = MCLK_441;
}
//setG_curSamFreqMultiplier(g_curSamFreq/(i_tmp/512));
setG_curSamFreqMultiplier((g_curSamFreq*512)/i_tmp);
setG_curSamFreqMultiplier((g_curSamFreq*512*4)/i_tmp);
/* Instruct audio thread to change sample freq */
outuint(c_audioControl, SET_SAMPLE_FREQ);

1
module_usb_audio/usb_buffer/usb_buffer.xc
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@@ -410,6 +410,7 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in,
/* Number of MCLKS this SOF, approx 125 * 24 (3000), sample by sample rate */
GET_SHARED_GLOBAL(cycles, g_curSamFreqMultiplier);
cycles = ((int)((short)(u_tmp - lastClock))) * cycles;
cycles >>= 2; /* /4 */
/* Any odd bits (lower than 16.23) have to be kept seperate */
remnant += cycles & mask;