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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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17
LUFA/Drivers/USB/Class/Device/CDC.c
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@ -240,6 +240,12 @@ void CDC_Device_CreateStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE*
fdev_set_udata(Stream, CDCInterfaceInfo);
}
void CDC_Device_CreateBlockingStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream)
{
*Stream = (FILE)FDEV_SETUP_STREAM(CDC_Device_putchar, CDC_Device_getchar_Blocking, _FDEV_SETUP_RW);
fdev_set_udata(Stream, CDCInterfaceInfo);
}
static int CDC_Device_putchar(char c, FILE* Stream)
{
return CDC_Device_SendByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream), c) ? _FDEV_ERR : 0;
@ -253,4 +259,15 @@ static int CDC_Device_getchar(FILE* Stream)
return CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
}
static int CDC_Device_getchar_Blocking(FILE* Stream)
{
while (!(CDC_Device_BytesReceived((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream))))
{
CDC_Device_USBTask((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
USB_USBTask();
}
return CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
}
#endif