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Fixed trap when no mclk applied by customer (device now sends 0-length packets in this case)

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This commit is contained in:
Ross Owen
2015-09-21 16:02:25 +01:00
parent 6cc3ea7549
commit 08c55f9a7d
1 changed files with 12 additions and 17 deletions
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29
module_usb_audio/usb_buffer/decouple.xc
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@@ -423,13 +423,15 @@ __builtin_unreachable();
{
/* Finished creating packet - commit it to the FIFO */
if (sampsToWrite == 0)
/* Total samps to write could start at 0 (i.e. no MCLK) so need to check for < 0) */
if (sampsToWrite <= 0)
{
int speed;
packState = 0;
/* Write last packet length into FIFO */
unsigned datasize = totalSampsToWrite * g_curSubSlot_In * g_numUsbChan_In;
write_via_xc_ptr(g_aud_to_host_wrptr, datasize);
/* Round up to nearest word - note, not needed for slotsize == 4! */
@@ -446,8 +448,10 @@ __builtin_unreachable();
g_aud_to_host_dptr = g_aud_to_host_wrptr + 4;
/* Now calculate new packet length... */
/* Get feedback val - ideally this would be syncronised */
/* Now calculate new packet length...
* First get feedback val (ideally this would be syncronised)
* Note, if customer hasn't applied a valid MCLK this could go to 0
* we need to handle this gracefully */
asm volatile("ldw %0, dp[g_speed]" : "=r" (speed) :);
/* Calc packet size to send back based on our fb */
@@ -471,7 +475,8 @@ __builtin_unreachable();
space_left = aud_to_host_fifo_end - g_aud_to_host_wrptr;
}
if((space_left > 0) && (space_left < (totalSampsToWrite * g_numUsbChan_In * g_curSubSlot_In + 4)))
//if((space_left > 0) && (space_left < (totalSampsToWrite * g_numUsbChan_In * g_curSubSlot_In + 4)))
if((space_left < (totalSampsToWrite * g_numUsbChan_In * g_curSubSlot_In + 4)))
{
/* In pipe has filled its buffer - we need to overflow
* Accept the packet, and throw away the oldest in the buffer */
@@ -496,7 +501,7 @@ __builtin_unreachable();
{
rdPtr = aud_to_host_fifo_start;
}
space_left += datalength;
SET_SHARED_GLOBAL(g_aud_to_host_rdptr, rdPtr);
@@ -548,20 +553,10 @@ static inline void SetupZerosSendBuffer(XUD_ep aud_to_host_usb_ep, unsigned samp
int min, mid, max, p;
GetADCCounts(sampFreq, min, mid, max);
// TODO, don't need to use speed.
//if (usb_speed == XUD_SPEED_HS)
//{
// mid *= NUM_USB_CHAN_IN * slotSize;
// }
//else
//{
// mid *= NUM_USB_CHAN_IN_FS * slotSize;
//}
/* Set IN stream packet size to something sensible. We expect the buffer to
* over flow and this to be reset */
SET_SHARED_GLOBAL(sampsToWrite, mid);
SET_SHARED_GLOBAL(totalSampsToWrite, mid);
SET_SHARED_GLOBAL(sampsToWrite, 0);
SET_SHARED_GLOBAL(totalSampsToWrite, 0);
mid *= g_numUsbChan_In * slotSize;