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Fix PrinterHost demo so that it will only enumerate printers with Bidirectional protocol encapsulation. Change enumeration code to automatically select the correct alternate setting for the printer interface to select the bidirectional protocol.

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This commit is contained in:
Dean Camera 2009-07-19 09:36:16 +00:00
parent 9d2613d908
commit d3fb6273aa
4 changed files with 44 additions and 30 deletions
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31
Demos/Host/Incomplete/PrinterHost/PrinterHost.c
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@ -36,8 +36,6 @@
#include "PrinterHost.h"
uint8_t PrinterProtocol;
int main(void)
{
@ -150,12 +148,37 @@ void USB_Printer_Host(void)
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
/* Some printers use alternate settings to determine the communication protocol used - if so, send a SetInterface
* request to switch to the interface alternate setting with the Bidirection protocol */
if (PrinterAltSetting)
{
USB_ControlRequest = (USB_Request_Header_t)
{
bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE),
bRequest: REQ_SetInterface,
wValue: PrinterAltSetting,
wIndex: PrinterInterfaceNumber,
wLength: 0,
};
if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Control Error (Set Interface).\r\n"));
printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
/* Indicate error via status LEDs */
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
/* Wait until USB device disconnected */
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
}
USB_HostState = HOST_STATE_Configured;
break;
case HOST_STATE_Configured:
printf_P(PSTR("Printer Protocol: %d\r\n"), PrinterProtocol);
puts_P(PSTR("Retrieving Device ID...\r\n"));
Device_ID_String_t DeviceIDString;