Fixed PrinterHost demo returning invalid Device ID data when the attached device...

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

diff --git a/Demos/Host/LowLevel/PrinterHost/Lib/PrinterCommands.c b/Demos/Host/LowLevel/PrinterHost/Lib/PrinterCommands.c
index 7ed8898..c75b7f9 100644 (file)
--- a/Demos/Host/LowLevel/PrinterHost/Lib/PrinterCommands.c
+++ b/Demos/Host/LowLevel/PrinterHost/Lib/PrinterCommands.c
@@ -77,7 +77,7 @@ uint8_t Printer_SendData(void* PrinterCommands, uint16_t CommandSize)
 uint8_t Printer_GetDeviceID(char* DeviceIDString, uint16_t BufferSize)\r
 {\r
        uint8_t  ErrorCode = HOST_SENDCONTROL_Successful;\r
 uint8_t Printer_GetDeviceID(char* DeviceIDString, uint16_t BufferSize)\r
 {\r
        uint8_t  ErrorCode = HOST_SENDCONTROL_Successful;\r

-       uint16_t DeviceIDStringLength;\r
+       uint16_t DeviceIDStringLength = 0;\r

 \r
        USB_ControlRequest = (USB_Request_Header_t)\r
                {\r
 \r
        USB_ControlRequest = (USB_Request_Header_t)\r
                {\r


@@ -92,6 +92,12 @@ uint8_t Printer_GetDeviceID(char* DeviceIDString, uint16_t BufferSize)
 \r
        if ((ErrorCode = USB_Host_SendControlRequest(&DeviceIDStringLength)) != HOST_SENDCONTROL_Successful)\r
          return ErrorCode;\r
 \r
        if ((ErrorCode = USB_Host_SendControlRequest(&DeviceIDStringLength)) != HOST_SENDCONTROL_Successful)\r
          return ErrorCode;\r

+         \r
+       if (!(DeviceIDStringLength))\r
+       {\r
+               DeviceIDString[0] = 0x00;\r
+               return HOST_SENDCONTROL_Successful;\r
+       }\r

        \r
        DeviceIDStringLength = SwapEndian_16(DeviceIDStringLength);\r
 \r
        \r
        DeviceIDStringLength = SwapEndian_16(DeviceIDStringLength);\r
 \r