Finished CDC device class driver documentation.

[pub/USBasp.git] / LUFA / Drivers / USB / Class / Device / CDC.c

diff --git a/LUFA/Drivers/USB/Class/Device/CDC.c b/LUFA/Drivers/USB/Class/Device/CDC.c
index dface2a..c551fb7 100644 (file)
--- a/LUFA/Drivers/USB/Class/Device/CDC.c
+++ b/LUFA/Drivers/USB/Class/Device/CDC.c
@@ -130,6 +130,9 @@ void USB_CDC_USBTask(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
 \r
 void USB_CDC_SendString(USB_ClassInfo_CDC_t* CDCInterfaceInfo, char* Data, uint16_t Length)\r
 {\r
+       if (!(USB_IsConnected))\r
+         return;\r
+\r
        Endpoint_SelectEndpoint(CDCInterfaceInfo->DataINEndpointNumber);\r
        Endpoint_Write_Stream_LE(Data, Length, NO_STREAM_CALLBACK);\r
 }\r
@@ -159,6 +162,9 @@ uint16_t USB_CDC_BytesReceived(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
 \r
 uint8_t USB_CDC_ReceiveByte(USB_ClassInfo_CDC_t* CDCInterfaceInfo)\r
 {\r
+       if (!(USB_IsConnected))\r
+         return 0;\r
+\r
        Endpoint_SelectEndpoint(CDCInterfaceInfo->DataOUTEndpointNumber);\r
        \r
        uint8_t DataByte = Endpoint_Read_Byte();\r
@@ -171,6 +177,9 @@ uint8_t USB_CDC_ReceiveByte(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
 \r
 void USB_CDC_SendSerialLineStateChange(USB_ClassInfo_CDC_t* CDCInterfaceInfo, uint16_t LineStateMask)\r
 {\r
+       if (!(USB_IsConnected))\r
+         return;\r
+\r
        Endpoint_SelectEndpoint(CDCInterfaceInfo->NotificationEndpointNumber);\r
        \r
        USB_Request_Header_t Notification = (USB_Request_Header_t)\r