aboutsummaryrefslogtreecommitdiffstats
path: root/Demos/Device/LowLevel/Keyboard/Keyboard.c
blob: 18fde65dd9baef55725f6c8c6efb8b20506f0878 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
/*
             LUFA Library
     Copyright (C) Dean Camera, 2013.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2013  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  Copyright 2010  Denver Gingerich (denver [at] ossguy [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 disclaims 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 Keyboard demo. This file contains the main tasks of the demo and
 *  is responsible for the initial application hardware configuration.
 */

#include "Keyboard.h"

/** Indicates what report mode the host has requested, true for normal HID reporting mode, \c false for special boot
 *  protocol reporting mode.
 */
static bool UsingReportProtocol = true;

/** Current Idle period. This is set by the host via a Set Idle HID class request to silence the device's reports
 *  for either the entire idle duration, or until the report status changes (e.g. the user presses a key).
 */
static uint16_t IdleCount = 500;

/** Current Idle period remaining. When the IdleCount value is set, this tracks the remaining number of idle
 *  milliseconds. This is separate to the IdleCount timer and is incremented and compared as the host may request
 *  the current idle period via a Get Idle HID class request, thus its value must be preserved.
 */
static uint16_t IdleMSRemaining = 0;


/** 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);
	GlobalInterruptEnable();

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

/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
{
#if (ARCH == ARCH_AVR8)
	/* Disable watchdog if enabled by bootloader/fuses */
	MCUSR &= ~(1 << WDRF);
	wdt_disable();

	/* Disable clock division */
	clock_prescale_set(clock_div_1);
#elif (ARCH == ARCH_XMEGA)
	/* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
	XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
	XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);

	/* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
	XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
	XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);

	PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
#endif

	/* Hardware Initialization */
	Joystick_Init();
	LEDs_Init();
	USB_Init();
	Buttons_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.
 */
void EVENT_USB_Device_Connect(void)
{
	/* Indicate USB enumerating */
	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);

	/* Default to report protocol on connect */
	UsingReportProtocol = true;
}

/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 *  the status LEDs.
 */
void EVENT_USB_Device_Disconnect(void)
{
	/* Indicate USB not ready */
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}

/** 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 keyboard device endpoints.
 */
void EVENT_USB_Device_ConfigurationChanged(void)
{
	bool ConfigSuccess = true;

	/* Setup HID Report Endpoints */
	ConfigSuccess &= Endpoint_ConfigureEndpoint(KEYBOARD_IN_EPADDR, EP_TYPE_INTERRUPT, KEYBOARD_EPSIZE, 1);
	ConfigSuccess &= Endpoint_ConfigureEndpoint(KEYBOARD_OUT_EPADDR, EP_TYPE_INTERRUPT, KEYBOARD_EPSIZE, 1);

	/* Turn on Start-of-Frame events for tracking HID report period expiry */
	USB_Device_EnableSOFEvents();

	/* Indicate endpoint configuration success or failure */
	LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
}

/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
 *  the device from the USB host before passing along unhandled control requests to the library for processing
 *  internally.
 */
void EVENT_USB_Device_ControlRequest(void)
{
	/* Handle HID Class specific requests */
	switch (USB_ControlRequest.bRequest)
	{
		case HID_REQ_GetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				USB_KeyboardReport_Data_t KeyboardReportData;

				/* Create the next keyboard report for transmission to the host */
				CreateKeyboardReport(&KeyboardReportData);

				Endpoint_ClearSETUP();

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

			break;
		case HID_REQ_SetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				/* Wait until the LED report has been sent by the host */
				while (!(Endpoint_IsOUTReceived()))
				{
					if (USB_DeviceState == DEVICE_STATE_Unattached)
					  return;
				}

				/* Read in the LED report from the host */
				uint8_t LEDStatus = Endpoint_Read_8();

				Endpoint_ClearOUT();
				Endpoint_ClearStatusStage();

				/* Process the incoming LED report */
				ProcessLEDReport(LEDStatus);
			}

			break;
		case HID_REQ_GetProtocol:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				/* Write the current protocol flag to the host */
				Endpoint_Write_8(UsingReportProtocol);

				Endpoint_ClearIN();
				Endpoint_ClearStatusStage();
			}

			break;
		case HID_REQ_SetProtocol:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_ClearStatusStage();

				/* Set or clear the flag depending on what the host indicates that the current Protocol should be */
				UsingReportProtocol = (USB_ControlRequest.wValue != 0);
			}

			break;
		case HID_REQ_SetIdle:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_ClearStatusStage();

				/* Get idle period in MSB, IdleCount must be multiplied by 4 to get number of milliseconds */
				IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);
			}

			break;
		case HID_REQ_GetIdle:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				/* Write the current idle duration to the host, must be divided by 4 before sent to host */
				Endpoint_Write_8(IdleCount >> 2);

				Endpoint_ClearIN();
				Endpoint_ClearStatusStage();
			}

			break;
	}
}

/** Event handler for the USB device Start Of Frame event. */
void EVENT_USB_Device_StartOfFrame(void)
{
	/* One millisecond has elapsed, decrement the idle time remaining counter if it has not already elapsed */
	if (IdleMSRemaining)
	  IdleMSRemaining--;
}

/** Fills the given HID report data structure with the next HID report to send to the host.
 *
 *  \param[out] ReportData  Pointer to a HID report data structure to be filled
 */
void CreateKeyboardReport(USB_KeyboardReport_Data_t* const ReportData)
{
	uint8_t JoyStatus_LCL     = Joystick_GetStatus();
	uint8_t ButtonStatus_LCL  = Buttons_GetStatus();

	uint8_t UsedKeyCodes      = 0;

	/* Clear the report contents */
	memset(ReportData, 0, sizeof(USB_KeyboardReport_Data_t));

	/* Make sent key uppercase by indicating that the left shift key is pressed */
	ReportData->Modifier = HID_KEYBOARD_MODIFIER_LEFTSHIFT;

	if (JoyStatus_LCL & JOY_UP)
	  ReportData->KeyCode[UsedKeyCodes++] = HID_KEYBOARD_SC_A;
	else if (JoyStatus_LCL & JOY_DOWN)
	  ReportData->KeyCode[UsedKeyCodes++] = HID_KEYBOARD_SC_B;

	if (JoyStatus_LCL & JOY_LEFT)
	  ReportData->KeyCode[UsedKeyCodes++] = HID_KEYBOARD_SC_C;
	else if (JoyStatus_LCL & JOY_RIGHT)
	  ReportData->KeyCode[UsedKeyCodes++] = HID_KEYBOARD_SC_D;

	if (JoyStatus_LCL & JOY_PRESS)
	  ReportData->KeyCode[UsedKeyCodes++] = HID_KEYBOARD_SC_E;

	if (ButtonStatus_LCL & BUTTONS_BUTTON1)
	  ReportData->KeyCode[UsedKeyCodes++] = HID_KEYBOARD_SC_F;
}

/** Processes a received LED report, and updates the board LEDs states to match.
 *
 *  \param[in] LEDReport  LED status report from the host
 */
void ProcessLEDReport(const uint8_t LEDReport)
{
	uint8_t LEDMask = LEDS_LED2;

	if (LEDReport & HID_KEYBOARD_LED_NUMLOCK)
	  LEDMask |= LEDS_LED1;

	if (LEDReport & HID_KEYBOARD_LED_CAPSLOCK)
	  LEDMask |= LEDS_LED3;

	if (LEDReport & HID_KEYBOARD_LED_SCROLLLOCK)
	  LEDMask |= LEDS_LED4;

	/* Set the status LEDs to the current Keyboard LED status */
	LEDs_SetAllLEDs(LEDMask);
}

/** Sends the next HID report to the host, via the keyboard data endpoint. */
void SendNextReport(void)
{
	static USB_KeyboardReport_Data_t PrevKeyboardReportData;
	USB_KeyboardReport_Data_t        KeyboardReportData;
	bool                             SendReport = false;

	/* Create the next keyboard report for transmission to the host */
	CreateKeyboardReport(&KeyboardReportData);

	/* Check if the idle period is set and has elapsed */
	if (IdleCount && (!(IdleMSRemaining)))
	{
		/* Reset the idle time remaining counter */
		IdleMSRemaining = IdleCount;

		/* Idle period is set and has elapsed, must send a report to the host */
		SendReport = true;
	}
	else
	{
		/* Check to see if the report data has changed - if so a report MUST be sent */
		SendReport = (memcmp(&PrevKeyboardReportData, &KeyboardReportData, sizeof(USB_KeyboardReport_Data_t)) != 0);
	}

	/* Select the Keyboard Report Endpoint */
	Endpoint_SelectEndpoint(KEYBOARD_IN_EPADDR);

	/* Check if Keyboard Endpoint Ready for Read/Write and if we should send a new report */
	if (Endpoint_IsReadWriteAllowed() && SendReport)
	{
		/* Save the current report data for later comparison to check for changes */
		PrevKeyboardReportData = KeyboardReportData;

		/* Write Keyboard Report Data */
		Endpoint_Write_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData), NULL);

		/* Finalize the stream transfer to send the last packet */
		Endpoint_ClearIN();
	}
}

/** Reads the next LED status report from the host from the LED data endpoint, if one has been sent. */
void ReceiveNextReport(void)
{
	/* Select the Keyboard LED Report Endpoint */
	Endpoint_SelectEndpoint(KEYBOARD_OUT_EPADDR);

	/* Check if Keyboard LED Endpoint contains a packet */
	if (Endpoint_IsOUTReceived())
	{
		/* Check to see if the packet contains data */
		if (Endpoint_IsReadWriteAllowed())
		{
			/* Read in the LED report from the host */
			uint8_t LEDReport = Endpoint_Read_8();

			/* Process the read LED report from the host */
			ProcessLEDReport(LEDReport);
		}

		/* Handshake the OUT Endpoint - clear endpoint and ready for next report */
		Endpoint_ClearOUT();
	}
}

/** Function to manage HID report generation and transmission to the host, when in report mode. */
void HID_Task(void)
{
	/* Device must be connected and configured for the task to run */
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;

	/* Send the next keypress report to the host */
	SendNextReport();

	/* Process the LED report sent from the host */
	ReceiveNextReport();
}