qmk_firmware/Demos/Host/LowLevel/PrinterHost/PrinterHost.c

/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
 *  Main source file for the PrinterHost demo. This file contains the main tasks of
 *  the demo and is responsible for the initial application hardware configuration.
 */

#include "PrinterHost.h"

/** Main program entry point. This routine configures the hardware required by the application, then
 *  enters a loop to run the application tasks in sequence.
 */
int main(void)
{
	SetupHardware();

	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);

	puts_P(PSTR(ESC_FG_CYAN "Printer Host Demo running.\r\n" ESC_FG_WHITE));
	sei();
	
	for (;;)
	{
		USB_Printer_Host();
		USB_USBTask();
	}
}

/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
{
	/* Disable watchdog if enabled by bootloader/fuses */
	MCUSR &= ~(1 << WDRF);
	wdt_disable();

	/* Disable clock division */
	clock_prescale_set(clock_div_1);

	/* Hardware Initialization */
	SerialStream_Init(9600, false);
	LEDs_Init();
	USB_Init();
}

/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
 *  starts the library USB task to begin the enumeration and USB management process.
 */
void EVENT_USB_Host_DeviceAttached(void)
{
	puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
}

/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 *  stops the library USB task management process.
 */
void EVENT_USB_Host_DeviceUnattached(void)
{
	puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}

/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 *  enumerated by the host and is now ready to be used by the application.
 */
void EVENT_USB_Host_DeviceEnumerationComplete(void)
{
	LEDs_SetAllLEDs(LEDMASK_USB_READY);
}

/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
{
	USB_ShutDown();

	printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
	                         " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);

	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	for(;;);
}

/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 *  enumerating an attached USB device.
 */
void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
                                            const uint8_t SubErrorCode)
{
	printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
	                         " -- Error Code %d\r\n"
	                         " -- Sub Error Code %d\r\n"
	                         " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);

	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
}

/** Task to set the configuration of the attached device after it has been enumerated, and to send some test page
 *  data to the attached printer.
 */
void USB_Printer_Host(void)
{
	uint8_t ErrorCode;

	switch (USB_HostState)
	{
		case HOST_STATE_Addressed:
			puts_P(PSTR("Getting Config Data.\r\n"));
			
			/* Select the control pipe for the request transfer */
			Pipe_SelectPipe(PIPE_CONTROLPIPE);			
		
			/* Get and process the configuration descriptor data */
			if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
			{
				if (ErrorCode == ControlError)
				  puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
				else
				  puts_P(PSTR(ESC_FG_RED "Invalid Device.\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;
			}
				
			/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
			if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
			{
				printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
				                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

				/* Indicate error via status LEDs */
				LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

				/* Wait until USB device disconnected */
				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 Bidirectional 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)
				{
					printf_P(PSTR(ESC_FG_RED "Control Error (Set Interface).\r\n"
					                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

					/* Indicate error via status LEDs */
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

					/* Wait until USB device disconnected */
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;					
				}
			}
			
			puts_P(PSTR("Retrieving Device ID...\r\n"));
		
			char DeviceIDString[300];
			if ((ErrorCode = Printer_GetDeviceID(DeviceIDString, sizeof(DeviceIDString))) != HOST_SENDCONTROL_Successful)
			{
				printf_P(PSTR(ESC_FG_RED "Control Error (Get Device ID).\r\n"
				                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

				/* Indicate error via status LEDs */
				LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

				/* Wait until USB device disconnected */
				USB_HostState = HOST_STATE_WaitForDeviceRemoval;
				break;
			}

			printf_P(PSTR("Printer Device ID: %s\r\n"), DeviceIDString);

			puts_P(PSTR("Printer Enumerated.\r\n"));

			USB_HostState = HOST_STATE_Configured;
			break;
		case HOST_STATE_Configured:
			/* Indicate device busy via the status LEDs */
			LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
		
			char  TestPageData[]    = "\033%-12345X\033E" "LUFA PCL Test Page" "\033E\033%-12345X";
			uint16_t TestPageLength = strlen(TestPageData);
		
			printf_P(PSTR("Sending Test Page (%d bytes)...\r\n"), TestPageLength);

			if ((ErrorCode = Printer_SendData(&TestPageData, TestPageLength)) != PIPE_RWSTREAM_NoError)
			{
				printf_P(PSTR(ESC_FG_RED "Error Sending Test Page.\r\n"
				                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

				/* Indicate error via status LEDs */
				LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

				/* Wait until USB device disconnected */
				USB_HostState = HOST_STATE_WaitForDeviceRemoval;
				break;
			}

			puts_P(PSTR("Test Page Sent.\r\n"));
		
			/* Indicate device no longer busy */
			LEDs_SetAllLEDs(LEDMASK_USB_READY);

			USB_HostState = HOST_STATE_WaitForDeviceRemoval;
			break;
	}
}