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Fixed PrinterHost demo returning invalid Device ID data when the attached device does not have a device ID (thanks to Andrei Krainev).

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This commit is contained in:
Dean Camera 2009-09-28 15:56:27 +00:00
parent 409c49f057
commit e57e08c672
5 changed files with 22 additions and 4 deletions
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8
Demos/Host/LowLevel/PrinterHost/Lib/PrinterCommands.c
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@ -77,7 +77,7 @@ uint8_t Printer_SendData(void* PrinterCommands, uint16_t CommandSize)
uint8_t Printer_GetDeviceID(char* DeviceIDString, uint16_t BufferSize)
{
uint8_t ErrorCode = HOST_SENDCONTROL_Successful;
uint16_t DeviceIDStringLength;
uint16_t DeviceIDStringLength = 0;
USB_ControlRequest = (USB_Request_Header_t)
{
@ -92,6 +92,12 @@ uint8_t Printer_GetDeviceID(char* DeviceIDString, uint16_t BufferSize)
if ((ErrorCode = USB_Host_SendControlRequest(&DeviceIDStringLength)) != HOST_SENDCONTROL_Successful)
return ErrorCode;
if (!(DeviceIDStringLength))
{
DeviceIDString[0] = 0x00;
return HOST_SENDCONTROL_Successful;
}
DeviceIDStringLength = SwapEndian_16(DeviceIDStringLength);