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Endpoint 0 only sends out format change commands if the interface Alt has changed (ignoring changes to the zero bandwidth alt)

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This commit is contained in:
Ross Owen
2014-04-08 15:50:09 +01:00
parent 393824c60f
commit 92d5596294
1 changed files with 15 additions and 4 deletions
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19
module_usb_audio/endpoint0/endpoint0.c
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@@ -93,6 +93,11 @@ extern unsigned char g_currentConfig;
/* Global endpoint status arrays - declared in usb_device.xc */
extern unsigned char g_interfaceAlt[];
/* We remember which streaming alt we were last using to avoid interrupting the I2S as best we can */
/* Note, we cannot simply use g_interfaceAlt[] since this also records using the zero bandwidth alt */
unsigned g_curStreamAlt_Out = 0;
unsigned g_curStreamAlt_In = 0;
/* Global variable for current USB bus speed (i.e. FS/HS) */
XUD_BusSpeed_t g_curUsbSpeed = 0;
@@ -228,14 +233,17 @@ void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
if(sp.bRequest == USB_SET_INTERFACE)
{
/* Check for audio stream from host start/stop */
if(sp.wIndex == 1) // Ouput interface
if(sp.wIndex == 1) /* Output interface */
{
/* Check the alt is in range */
if(sp.wValue <= OUTPUT_FORMAT_COUNT)
{
/* Alt 0 is stream stop */
if(sp.wValue > 0)
/* Only send change if we need to */
if((sp.wValue > 0) && (g_curStreamAlt_Out != sp.wValue))
{
g_curStreamAlt_Out = sp.wValue;
/* Send format of data onto buffering */
outuint(c_audioControl, SET_STREAM_FORMAT_OUT);
outuint(c_audioControl, g_dataFormat_Out[sp.wValue-1]); /* Data format (PCM/DSD) */
@@ -256,14 +264,17 @@ void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
}
}
}
else if(sp.wIndex == 2) // Input interface
else if(sp.wIndex == 2) /* Input interface */
{
/* Check the alt is in range */
if(sp.wValue <= INPUT_FORMAT_COUNT)
{
/* Alt 0 is stream stop */
if(sp.wValue > 0)
/* Only send change if we need to */
if((sp.wValue > 0) && (g_curStreamAlt_In != sp.wValue))
{
g_curStreamAlt_In = sp.wValue;
/* Send format of data onto buffering */
outuint(c_audioControl, SET_STREAM_FORMAT_IN);
outuint(c_audioControl, g_dataFormat_In[sp.wValue-1]); /* Data format (PCM/DSD) */