Magstripe Project: Ensure that empty tracks still print out a newline seperator so...

[pub/USBasp.git] / Demos / Host / Incomplete / PrinterHost / Lib / PrinterCommands.c

diff --git a/Demos/Host/Incomplete/PrinterHost/Lib/PrinterCommands.c b/Demos/Host/Incomplete/PrinterHost/Lib/PrinterCommands.c
index 0312891..46e534d 100644 (file)
--- a/Demos/Host/Incomplete/PrinterHost/Lib/PrinterCommands.c
+++ b/Demos/Host/Incomplete/PrinterHost/Lib/PrinterCommands.c
@@ -32,7 +32,8 @@
 \r
 uint8_t Printer_GetDeviceID(Device_ID_String_t* DeviceIDString)\r
 {\r
-       uint8_t ErrorCode = HOST_SENDCONTROL_Successful;\r
+       uint8_t  ErrorCode = HOST_SENDCONTROL_Successful;\r
+       uint16_t DeviceIDStringLength;\r
 \r
        USB_ControlRequest = (USB_Request_Header_t)\r
                {\r
@@ -40,19 +41,24 @@ uint8_t Printer_GetDeviceID(Device_ID_String_t* DeviceIDString)
                        bRequest:      GET_DEVICE_ID,\r
                        wValue:        0,\r
                        wIndex:        0,\r
-                       wLength:       sizeof(DeviceIDString),\r
+                       wLength:       sizeof(DeviceIDString->Length),\r
                };\r
 \r
-       if ((ErrorCode == USB_Host_SendControlRequest(DeviceIDString)) != HOST_SENDCONTROL_Successful)\r
+       if ((ErrorCode = USB_Host_SendControlRequest(DeviceIDString)) != HOST_SENDCONTROL_Successful)\r
          return ErrorCode;\r
-         \r
-       DeviceIDString->Length = SwapEndian_16(DeviceIDString->Length);\r
        \r
+       DeviceIDStringLength = SwapEndian_16(DeviceIDString->Length);\r
+\r
        /* Protect against overflow for the null terminator if the string length is equal to or larger than the buffer */\r
-       if (DeviceIDString->Length >= sizeof(DeviceIDString->String))\r
-         DeviceIDString->Length = sizeof(DeviceIDString->String) - 1;\r
+       if (DeviceIDStringLength >= sizeof(DeviceIDString->String))\r
+         DeviceIDStringLength = sizeof(DeviceIDString->String) - 1;\r
+\r
+       USB_ControlRequest.wLength = DeviceIDStringLength;\r
+       \r
+       if ((ErrorCode = USB_Host_SendControlRequest(DeviceIDString)) != HOST_SENDCONTROL_Successful)\r
+         return ErrorCode;\r
        \r
-       DeviceIDString->String[DeviceIDString->Length] = 0x00;\r
+       DeviceIDString->String[DeviceIDStringLength] = 0x00;\r
        \r
        return HOST_SENDCONTROL_Successful;\r
 }\r