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Added some defences against a 0 length packet being received from the host and breaking the MIDI/IAP FIFOs. Also added further use of XUD_Result_t in select functions.

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This commit is contained in:
Ross Owen
2014-02-20 18:22:46 +00:00
parent 6d838ece93
commit 22758cc81c
1 changed files with 32 additions and 29 deletions
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41
module_usb_audio/usb_buffer/usb_buffer.xc
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@@ -165,7 +165,6 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
unsigned char iap_from_host_buffer[MAX_IAP_PACKET_SIZE+4]; unsigned char iap_from_host_buffer[MAX_IAP_PACKET_SIZE+4];
unsigned char iap_to_host_buffer[MAX_IAP_PACKET_SIZE+4]; unsigned char iap_to_host_buffer[MAX_IAP_PACKET_SIZE+4];
int is_ack_iap; int is_ack_iap;
int is_reset; int is_reset;
unsigned int datum_iap; unsigned int datum_iap;
@@ -175,8 +174,6 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
int iap_draining_chan = 0; int iap_draining_chan = 0;
#endif #endif
//xc_ptr p_inZeroBuff = array_to_xc_ptr(inZeroBuff);
#if defined(SPDIF_RX) || defined(ADAT_RX) #if defined(SPDIF_RX) || defined(ADAT_RX)
asm("stw %0, dp[int_usb_ep]"::"r"(ep_int)); asm("stw %0, dp[int_usb_ep]"::"r"(ep_int));
#endif #endif
@@ -214,6 +211,9 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
while(1) while(1)
{ {
XUD_Result_t result;
unsigned length;
/* Wait for response from XUD and service relevant EP */ /* Wait for response from XUD and service relevant EP */
select select
{ {
@@ -376,7 +376,7 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
#ifdef INPUT #ifdef INPUT
/* Sent audio packet DEVICE -> HOST */ /* Sent audio packet DEVICE -> HOST */
case XUD_SetData_Select(c_aud_in, ep_aud_in, tmp): case XUD_SetData_Select(c_aud_in, ep_aud_in, result):
{ {
/* Inform stream that buffer sent */ /* Inform stream that buffer sent */
SET_SHARED_GLOBAL0(g_aud_to_host_flag, bufferIn+1); SET_SHARED_GLOBAL0(g_aud_to_host_flag, bufferIn+1);
@@ -386,7 +386,7 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
#ifdef OUTPUT #ifdef OUTPUT
/* Feedback Pipe */ /* Feedback Pipe */
case XUD_SetData_Select(c_aud_fb, ep_aud_fb, tmp): case XUD_SetData_Select(c_aud_fb, ep_aud_fb, result):
{ {
asm("#aud fb"); asm("#aud fb");
XUD_BusSpeed_t busSpeed; XUD_BusSpeed_t busSpeed;
@@ -404,14 +404,14 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
} }
break; break;
/* Recieved Audio packet HOST -> DEVICE */ /* Received Audio packet HOST -> DEVICE. Datalength written to length */
case XUD_GetData_Select(c_aud_out, ep_aud_out, tmp): case XUD_GetData_Select(c_aud_out, ep_aud_out, length, result):
{ {
asm("#h->d aud data"); asm("#h->d aud data");
GET_SHARED_GLOBAL(aud_from_host_buffer, g_aud_from_host_buffer); GET_SHARED_GLOBAL(aud_from_host_buffer, g_aud_from_host_buffer);
write_via_xc_ptr(aud_from_host_buffer, tmp); write_via_xc_ptr(aud_from_host_buffer, length);
/* Sync with decouple thread */ /* Sync with decouple thread */
SET_SHARED_GLOBAL0(g_aud_from_host_flag, 1); SET_SHARED_GLOBAL0(g_aud_from_host_flag, 1);
@@ -420,12 +420,14 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
#endif #endif
#ifdef MIDI #ifdef MIDI
case XUD_GetData_Select(c_midi_from_host, ep_midi_from_host, tmp): case XUD_GetData_Select(c_midi_from_host, ep_midi_from_host, length, result):
asm("#midi h->d"); asm("#midi h->d");
if((result == XUD_RES_OKAY) && (length > 0))
{
/* Get buffer data from host - MIDI OUT from host always into a single buffer */ /* Get buffer data from host - MIDI OUT from host always into a single buffer */
/* Write datalength (tmp) into buffer[0], data stored in buffer[4] onwards */ /* Write datalength (tmp) into buffer[0], data stored in buffer[4] onwards */
midi_data_remaining_to_device = tmp; midi_data_remaining_to_device = length;
midi_from_host_rdptr = midi_from_host_buffer; midi_from_host_rdptr = midi_from_host_buffer;
@@ -436,10 +438,11 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
midi_from_host_rdptr += 4; midi_from_host_rdptr += 4;
midi_data_remaining_to_device -= 4; midi_data_remaining_to_device -= 4;
} }
}
break; break;
/* MIDI IN to host */ /* MIDI IN to host */
case XUD_SetData_Select(c_midi_to_host, ep_midi_to_host, tmp): case XUD_SetData_Select(c_midi_to_host, ep_midi_to_host, result):
asm("#midi d->h"); asm("#midi d->h");
/* The buffer has been sent to the host, so we can ack the midi thread */ /* The buffer has been sent to the host, so we can ack the midi thread */
@@ -464,12 +467,12 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
#endif #endif
#ifdef IAP #ifdef IAP
/* IAP OUT from host */ /* IAP OUT from host. Datalength writen to tmp */
case XUD_GetData_Select(c_iap_from_host, ep_iap_from_host, tmp): case XUD_GetData_Select(c_iap_from_host, ep_iap_from_host, length, result):
asm("#iap h->d"); asm("#iap h->d");
if(tmp >= 0) if((result == XUD_RES_OKAY) && (length > 0))
{ {
iap_data_remaining_to_device = tmp; iap_data_remaining_to_device = length;
if(iap_data_remaining_to_device) if(iap_data_remaining_to_device)
{ {
@@ -489,10 +492,10 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
break; break;
/* IAP IN to host */ /* IAP IN to host */
case XUD_SetData_Select(c_iap_to_host, ep_iap_to_host, tmp): case XUD_SetData_Select(c_iap_to_host, ep_iap_to_host, result):
asm("#iap d->h"); asm("#iap d->h");
if(tmp == -1) if(result == XUD_RES_RST)
{ {
XUD_ResetEndpoint(ep_iap_to_host, null); XUD_ResetEndpoint(ep_iap_to_host, null);
#ifdef IAP_INT_EP #ifdef IAP_INT_EP
@@ -513,7 +516,7 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
break; /* IAP IN to host */ break; /* IAP IN to host */
#ifdef IAP_INT_EP #ifdef IAP_INT_EP
case XUD_SetData_Select(c_iap_to_host_int, ep_iap_to_host_int, tmp): case XUD_SetData_Select(c_iap_to_host_int, ep_iap_to_host_int, result):
asm("#iap int d->h"); asm("#iap int d->h");
/* Do nothing.. */ /* Do nothing.. */
@@ -524,7 +527,7 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
#ifdef HID_CONTROLS #ifdef HID_CONTROLS
/* HID Report Data */ /* HID Report Data */
case XUD_SetData_Select(c_hid, ep_hid, tmp): case XUD_SetData_Select(c_hid, ep_hid, result):
{ {
g_hidData[0]=0; g_hidData[0]=0;
UserReadHIDButtons(g_hidData); UserReadHIDButtons(g_hidData);