GenericHID.c 8.05 KB
Newer Older
1
2
/*
             LUFA Library
Dean Camera's avatar
Dean Camera committed
3
     Copyright (C) Dean Camera, 2010.
4
5
6
7
8
9
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
Dean Camera's avatar
Dean Camera committed
10
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
11

12
13
14
15
16
17
18
  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 
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
  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 GenericHID demo. This file contains the main tasks of the demo and
 *  is responsible for the initial application hardware configuration.
 */

#include "GenericHID.h"

/** Static buffer to hold the last received report from the host, so that it can be echoed back in the next sent report */
static uint8_t LastReceived[GENERIC_REPORT_SIZE];


/** Main program entry point. This routine configures the hardware required by the application, then
44
 *  enters a loop to run the application tasks in sequence.
45
46
 */
int main(void)
47
48
49
50
{
	SetupHardware();
	
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
51
	sei();
52
53
54
55
56
57
58
59
60
61

	for (;;)
	{
		HID_Task();
		USB_USBTask();
	}
}

/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
{
	/* Disable watchdog if enabled by bootloader/fuses */
	MCUSR &= ~(1 << WDRF);
	wdt_disable();

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

	/* Hardware Initialization */
	LEDs_Init();
	USB_Init();
}

/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
 *  starts the library USB task to begin the enumeration and USB management process.
 */
78
void EVENT_USB_Device_Connect(void)
79
80
{
	/* Indicate USB enumerating */
81
	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
82
83
84
85
86
}

/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 *  the status LEDs and stops the USB management task.
 */
87
void EVENT_USB_Device_Disconnect(void)
88
89
{
	/* Indicate USB not ready */
90
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
91
92
93
94
95
}

/** Event handler for the USB_ConfigurationChanged event. This is fired when the host sets the current configuration
 *  of the USB device after enumeration, and configures the generic HID device endpoints.
 */
96
void EVENT_USB_Device_ConfigurationChanged(void)
97
98
{
	/* Indicate USB connected and ready */
99
	LEDs_SetAllLEDs(LEDMASK_USB_READY);
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115

	/* Setup Generic IN Report Endpoint */
	if (!(Endpoint_ConfigureEndpoint(GENERIC_IN_EPNUM, EP_TYPE_INTERRUPT,
		                             ENDPOINT_DIR_IN, GENERIC_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
	
	/* Setup Generic OUT Report Endpoint */
	if (!(Endpoint_ConfigureEndpoint(GENERIC_OUT_EPNUM, EP_TYPE_INTERRUPT,
		                             ENDPOINT_DIR_OUT, GENERIC_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
116
117
}

118
/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
119
120
121
 *  control requests that are not handled internally by the USB library (including the HID commands, which are
 *  all issued via the control endpoint), so that they can be handled appropriately for the application.
 */
122
void EVENT_USB_Device_UnhandledControlRequest(void)
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
{
	/* Handle HID Class specific requests */
	switch (USB_ControlRequest.bRequest)
	{
		case REQ_GetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				uint8_t GenericData[GENERIC_REPORT_SIZE];

				Endpoint_ClearSETUP();
	
				CreateGenericHIDReport(GenericData);

				/* Write the report data to the control endpoint */
				Endpoint_Write_Control_Stream_LE(&GenericData, sizeof(GenericData));

				/* Finalize the stream transfer to send the last packet or clear the host abort */
				Endpoint_ClearOUT();
			}
		
			break;
		case REQ_SetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				uint8_t GenericData[GENERIC_REPORT_SIZE];

				Endpoint_ClearSETUP();
				
				/* Wait until the generic report has been sent by the host */
152
153
154
155
156
				while (!(Endpoint_IsOUTReceived()))
				{
					if (USB_DeviceState == DEVICE_STATE_Unattached)
					  return;
				}
157
158
159
160
161
162
163
164
165

				Endpoint_Read_Control_Stream_LE(&GenericData, sizeof(GenericData));

				ProcessGenericHIDReport(GenericData);
			
				/* Clear the endpoint data */
				Endpoint_ClearOUT();

				/* Wait until the host is ready to receive the request confirmation */
166
167
168
169
170
				while (!(Endpoint_IsINReady()))
				{
					if (USB_DeviceState == DEVICE_STATE_Unattached)
					  return;
				}
171
172
173
174
175
176
177
178
179
180
181
				
				/* Handshake the request by sending an empty IN packet */
				Endpoint_ClearIN();
			}
			
			break;
	}
}

/** Function to process the lest received report from the host.
 *
182
 *  \param[in] DataArray  Pointer to a buffer where the last report data is stored
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
 */
void ProcessGenericHIDReport(uint8_t* DataArray)
{
	/*
		This is where you need to process the reports being sent from the host to the device.
		DataArray is an array holding the last report from the host. This function is called
		each time the host has sent a report to the device.
	*/
	
	for (uint8_t i = 0; i < GENERIC_REPORT_SIZE; i++)
	  LastReceived[i] = DataArray[i];
}

/** Function to create the next report to send back to the host at the next reporting interval.
 *
198
 *  \param[out] DataArray  Pointer to a buffer where the next report data should be stored
199
200
201
202
203
204
205
206
207
208
209
210
211
 */
void CreateGenericHIDReport(uint8_t* DataArray)
{
	/*
		This is where you need to create reports to be sent to the host from the device. This
		function is called each time the host is ready to accept a new report. DataArray is 
		an array to hold the report to the host.
	*/

	for (uint8_t i = 0; i < GENERIC_REPORT_SIZE; i++)
	  DataArray[i] = LastReceived[i];
}

212
void HID_Task(void)
213
{
214
	/* Device must be connected and configured for the task to run */
215
	if (USB_DeviceState != DEVICE_STATE_Configured)
216
217
218
219
220
221
	  return;

	Endpoint_SelectEndpoint(GENERIC_OUT_EPNUM);
	
	/* Check to see if a packet has been sent from the host */
	if (Endpoint_IsOUTReceived())
222
	{
223
224
		/* Check to see if the packet contains data */
		if (Endpoint_IsReadWriteAllowed())
225
		{
226
227
228
229
230
231
232
233
234
			/* Create a temporary buffer to hold the read in report from the host */
			uint8_t GenericData[GENERIC_REPORT_SIZE];
			
			/* Read Generic Report Data */
			Endpoint_Read_Stream_LE(&GenericData, sizeof(GenericData));
			
			/* Process Generic Report Data */
			ProcessGenericHIDReport(GenericData);
		}
235

236
237
238
		/* Finalize the stream transfer to send the last packet */
		Endpoint_ClearOUT();
	}	
239

240
241
242
243
244
245
246
	Endpoint_SelectEndpoint(GENERIC_IN_EPNUM);
	
	/* Check to see if the host is ready to accept another packet */
	if (Endpoint_IsINReady())
	{
		/* Create a temporary buffer to hold the report to send to the host */
		uint8_t GenericData[GENERIC_REPORT_SIZE];
247
		
248
249
		/* Create Generic Report Data */
		CreateGenericHIDReport(GenericData);
250

251
252
		/* Write Generic Report Data */
		Endpoint_Write_Stream_LE(&GenericData, sizeof(GenericData));
253

254
255
		/* Finalize the stream transfer to send the last packet */
		Endpoint_ClearIN();
256
257
	}
}