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Fix for bug 15218 - iAP detect sequence can fail after rapid reconnection attempts. On reset drain the c_iap channel of old data until the iAP core returns a reset token.

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This commit is contained in:
Sam Chesney
2014-02-06 11:48:59 +00:00
parent ef52f39b7f
commit f625904415
1 changed files with 56 additions and 42 deletions
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98
module_usb_audio/usb_buffer/usb_buffer.xc
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@@ -170,6 +170,7 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
int iap_data_remaining_to_device = 0;
int iap_data_collected_from_device = 0;
int iap_expected_data_length = 0;
int iap_draining_chan = 0;
#endif
@@ -555,7 +556,8 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
else if(tmp==-1)
{
XUD_ResetEndpoint(ep_iap_from_host, null);
iap_send_reset(c_iap); // What if this happen in the middle of a send/ack?
iap_send_reset(c_iap);
iap_draining_chan = 1; // Drain c_iap until a reset is sent back
iap_data_collected_from_device = 0;
iap_data_remaining_to_device = -1;
iap_expected_data_length = 0;
@@ -644,58 +646,70 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
/* Received word from iap thread - Check for ACK or Data */
case iap_get_ack_or_reset_or_data(c_iap, is_ack_iap, is_reset, datum_iap):
if (is_ack_iap)
if (iap_draining_chan)
{
/* An ack from the iap/uart thread means it has accepted some data we sent it
* we are okay to send another word */
if (iap_data_remaining_to_device == 0)
/* As we're draining the iAP channel now, ignore ACKs and data */
if (is_reset)
{
/* We have read an entire packet - Mark ready to receive another */
XUD_SetReady_Out(ep_iap_from_host, iap_from_host_buffer);
}
else
{
/* Read another byte from the fifo and output it to iap thread */
datum_iap = iap_from_host_buffer[iap_from_host_rdptr];
outuint(c_iap, datum_iap);
iap_from_host_rdptr += 1;
iap_data_remaining_to_device -= 1;
// The iAP core has returned a reset token, so we can stop draining the iAP channel now
iap_draining_chan = 0;
}
}
else
{
if (iap_expected_data_length == 0)
if (is_ack_iap)
{
/* Expect a length from iAP core */
iap_send_ack(c_iap);
iap_expected_data_length = datum_iap;
/* An ack from the iap/uart thread means it has accepted some data we sent it
* we are okay to send another word */
if (iap_data_remaining_to_device == 0)
{
/* We have read an entire packet - Mark ready to receive another */
XUD_SetReady_Out(ep_iap_from_host, iap_from_host_buffer);
}
else
{
/* Read another byte from the fifo and output it to iap thread */
datum_iap = iap_from_host_buffer[iap_from_host_rdptr];
outuint(c_iap, datum_iap);
iap_from_host_rdptr += 1;
iap_data_remaining_to_device -= 1;
}
}
else
else if (!is_reset)
{
if (iap_data_collected_from_device < IAP_USB_BUFFER_TO_HOST_SIZE)
if (iap_expected_data_length == 0)
{
/* There is room in the collecting buffer for the data.. */
iap_to_host_buffer[iap_data_collected_from_device] = datum_iap;
iap_data_collected_from_device += 1;
}
else
{
// Too many events from device - drop
}
/* Once we have the whole message, sent it to host */
/* Note we don't ack the last byte yet... */
if (iap_data_collected_from_device == iap_expected_data_length)
{
XUD_SetReady_In(ep_iap_to_host_int, gc_zero_buffer, 0);
XUD_SetReady_In(ep_iap_to_host, iap_to_host_buffer, iap_data_collected_from_device);
iap_data_collected_from_device = 0;
iap_expected_data_length = 0;
}
else
{
/* The iap/uart thread has sent us some data - handshake back */
/* Expect a length from iAP core */
iap_send_ack(c_iap);
iap_expected_data_length = datum_iap;
}
else
{
if (iap_data_collected_from_device < IAP_USB_BUFFER_TO_HOST_SIZE)
{
/* There is room in the collecting buffer for the data.. */
iap_to_host_buffer[iap_data_collected_from_device] = datum_iap;
iap_data_collected_from_device += 1;
}
else
{
// Too many events from device - drop
}
/* Once we have the whole message, sent it to host */
/* Note we don't ack the last byte yet... */
if (iap_data_collected_from_device == iap_expected_data_length)
{
XUD_SetReady_In(ep_iap_to_host_int, gc_zero_buffer, 0);
XUD_SetReady_In(ep_iap_to_host, iap_to_host_buffer, iap_data_collected_from_device);
iap_data_collected_from_device = 0;
iap_expected_data_length = 0;
}
else
{
/* The iap/uart thread has sent us some data - handshake back */
iap_send_ack(c_iap);
}
}
}
}