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Add blocking versions of the CDC Class driver streams, for applications requiring blocking reads.

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This commit is contained in:
Dean Camera 2009-11-12 12:47:15 +00:00
parent 6a46f0025a
commit 652042111c
4 changed files with 51 additions and 0 deletions
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11
LUFA/Drivers/USB/Class/Host/CDC.c
View file

@ -353,6 +353,17 @@ static int CDC_Host_getchar(FILE* Stream)
return CDC_Host_ReceiveByte((USB_ClassInfo_CDC_Host_t*)fdev_get_udata(Stream));
}
static int CDC_Host_getchar_Blocking(FILE* Stream)
{
while (!(CDC_Host_BytesReceived((USB_ClassInfo_CDC_Host_t*)fdev_get_udata(Stream))))
{
CDC_Host_USBTask((USB_ClassInfo_CDC_Host_t*)fdev_get_udata(Stream));
USB_USBTask();
}
return CDC_Host_ReceiveByte((USB_ClassInfo_CDC_Host_t*)fdev_get_udata(Stream));
}
void CDC_Host_Event_Stub(void)
{

9
LUFA/Drivers/USB/Class/Host/CDC.h
View file

@ -219,6 +219,14 @@
*/
void CDC_Host_CreateStream(USB_ClassInfo_CDC_Host_t* CDCInterfaceInfo, FILE* Stream);
/** Identical to CDC_Host_CreateStream(), except that reads are blocking until the calling stream function terminates
* the transfer. While blocking, the USB and CDC service tasks are called repeatedly to maintain USB communications.
*
* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed
*/
void CDC_Host_CreateBlockingStream(USB_ClassInfo_CDC_Host_t* CDCInterfaceInfo, FILE* Stream);
/** CDC class driver event for a control line state change on a CDC host interface. This event fires each time the device notifies
* the host of a control line state change (containing the virtual serial control line states, such as DCD) and may be hooked in the
* user program by declaring a handler function with the same name and parameters listed here. The new control line states
@ -247,6 +255,7 @@
#if defined(INCLUDE_FROM_CDC_CLASS_HOST_C)
static int CDC_Host_putchar(char c, FILE* Stream);
static int CDC_Host_getchar(FILE* Stream);
static int CDC_Host_getchar_Blocking(FILE* Stream);
void CDC_Host_Event_Stub(void);
void EVENT_CDC_Host_ControLineStateChanged(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo)