qmk_firmware/Demos/Host/CDCHost/CDCHost.c

/*
             LUFA Library
     Copyright (C) Dean Camera, 2009.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, and distribute this software
  and its documentation for any purpose and without fee is hereby
  granted, 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 CDCHost demo. This file contains the main tasks of
 *  the demo and is responsible for the initial application hardware configuration.
 */
 
#include "CDCHost.h"

/* Scheduler Task List */
TASK_LIST
{
	{ .Task = USB_USBTask          , .TaskStatus = TASK_STOP },
	{ .Task = USB_CDC_Host         , .TaskStatus = TASK_STOP },
};


/** Main program entry point. This routine configures the hardware required by the application, then
 *  starts the scheduler to run the application tasks.
 */
int main(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();
	
	/* Indicate USB not ready */
	UpdateStatus(Status_USBNotReady);
	
	/* Initialize Scheduler so that it can be used */
	Scheduler_Init();

	/* Initialize USB Subsystem */
	USB_Init();

	/* Start-up message */
	puts_P(PSTR(ESC_RESET ESC_BG_WHITE ESC_INVERSE_ON ESC_ERASE_DISPLAY
	       "CDC Host Demo running.\r\n" ESC_INVERSE_OFF));
		   
	/* Scheduling - routine never returns, so put this last in the main function */
	Scheduler_Start();
}

/** 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.
 */
EVENT_HANDLER(USB_DeviceAttached)
{
	puts_P(PSTR("Device Attached.\r\n"));
	UpdateStatus(Status_USBEnumerating);

	/* Start USB management task to enumerate the device */
	Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
}

/** 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.
 */
EVENT_HANDLER(USB_DeviceUnattached)
{
	/* Stop keyboard and USB management task */
	Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
	Scheduler_SetTaskMode(USB_CDC_Host, TASK_STOP);

	puts_P(PSTR("\r\nDevice Unattached.\r\n"));
	UpdateStatus(Status_USBNotReady);
}

/** 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.
 */
EVENT_HANDLER(USB_DeviceEnumerationComplete)
{
	/* Start CDC Host task */
	Scheduler_SetTaskMode(USB_CDC_Host, TASK_RUN);

	/* Indicate device enumeration complete */
	UpdateStatus(Status_USBReady);
}

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

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

	UpdateStatus(Status_HardwareError);
	for(;;);
}

/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 *  enumerating an attached USB device.
 */
EVENT_HANDLER(USB_DeviceEnumerationFailed)
{
	puts_P(PSTR(ESC_BG_RED "Dev Enum Error\r\n"));
	printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
	printf_P(PSTR(" -- Sub Error Code %d\r\n"), SubErrorCode);
	printf_P(PSTR(" -- In State %d\r\n"), USB_HostState);
	
	UpdateStatus(Status_EnumerationError);
}

/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
 *  log to a serial port, or anything else that is suitable for status updates.
 *
 *  \param CurrentStatus  Current status of the system, from the CDCHost_StatusCodes_t enum
 */
void UpdateStatus(uint8_t CurrentStatus)
{
	uint8_t LEDMask = LEDS_NO_LEDS;
	
	/* Set the LED mask to the appropriate LED mask based on the given status code */
	switch (CurrentStatus)
	{
		case Status_USBNotReady:
			LEDMask = (LEDS_LED1);
			break;
		case Status_USBEnumerating:
			LEDMask = (LEDS_LED1 | LEDS_LED2);
			break;
		case Status_USBReady:
			LEDMask = (LEDS_LED2);
			break;
		case Status_EnumerationError:
		case Status_HardwareError:
			LEDMask = (LEDS_LED1 | LEDS_LED3);
			break;
	}
	
	/* Set the board LEDs to the new LED mask */
	LEDs_SetAllLEDs(LEDMask);
}

/** Task to set the configuration of the attached device after it has been enumerated, and to read in
 *  data received from the attached CDC device and print it to the serial port.
 */
TASK(USB_CDC_Host)
{
	uint8_t ErrorCode;

	switch (USB_HostState)
	{
		case HOST_STATE_Addressed:
			/* Standard request to set the device configuration to configuration 1 */
			USB_ControlRequest = (USB_Request_Header_t)
				{
					.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_DEVICE),
					.bRequest      = REQ_SetConfiguration,
					.wValue        = 1,
					.wIndex        = 0,
					.wLength       = 0,
				};

			/* Select the control pipe for the request transfer */
			Pipe_SelectPipe(PIPE_CONTROLPIPE);

			/* Send the request, display error and wait for device detach if request fails */
			if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
			{
				puts_P(PSTR("Control Error (Set Configuration).\r\n"));
				printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);

				/* Indicate error via status LEDs */
				UpdateStatus(Status_EnumerationError);

				/* Wait until USB device disconnected */
				while (USB_IsConnected);
				break;
			}
				
			USB_HostState = HOST_STATE_Configured;
			break;
		case HOST_STATE_Configured:
			puts_P(PSTR("Getting Config Data.\r\n"));
		
			/* Get and process the configuration descriptor data */
			if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
			{
				if (ErrorCode == ControlError)
				  puts_P(PSTR("Control Error (Get Configuration).\r\n"));
				else
				  puts_P(PSTR("Invalid Device.\r\n"));

				printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
				
				/* Indicate error via status LEDs */
				UpdateStatus(Status_EnumerationError);

				/* Wait until USB device disconnected */
				while (USB_IsConnected);
				break;
			}

			puts_P(PSTR("CDC Device Enumerated.\r\n"));
				
			USB_HostState = HOST_STATE_Ready;
			break;
		case HOST_STATE_Ready:
			/* Select and the data IN pipe */
			Pipe_SelectPipe(CDC_DATAPIPE_IN);

			/* Check to see if a packet has been received */
			if (Pipe_IsINReceived())
			{
				/* Check if data is in the pipe */
				if (Pipe_IsReadWriteAllowed())
				{
					/* Get the length of the pipe data, and create a new buffer to hold it */
					uint16_t BufferLength = Pipe_BytesInPipe();
					uint8_t Buffer[BufferLength];
					
					/* Read in the pipe data to the temporary buffer */
					Pipe_Read_Stream_LE(Buffer, BufferLength);
									
					/* Print out the buffer contents to the USART */
					for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
					  putchar(Buffer[BufferByte]);
				}

				/* Clear the pipe after it is read, ready for the next packet */
				Pipe_ClearIN();
			}

			/* Select and unfreeze the notification pipe */
			Pipe_SelectPipe(CDC_NOTIFICATIONPIPE);
			Pipe_Unfreeze();
			
			/* Check if a packet has been received */
			if (Pipe_IsINReceived())
			{
				/* Discard the event notification */
				Pipe_ClearIN();
			}
			
			/* Freeze notification IN pipe after use */
			Pipe_Freeze();
						
			break;
	}
}