aboutsummaryrefslogtreecommitdiffstats
path: root/Demos/Device/LowLevel/DualVirtualSerial/DualVirtualSerial.c
blob: b94a67dab5dd84481605d7a67009981a61df1d18 (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
/*
             LUFA Library
     Copyright (C) Dean Camera, 2017.

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

/*
  Copyright 2017  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 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 DualVirtualSerial demo. This file contains the main tasks of the demo and
 *  is responsible for the initial application hardware configuration.
 */

#include "DualVirtualSerial.h"

/** Contains the current baud rate and other settings of the first virtual serial port. While this demo does not use
 *  the physical USART and thus does not use these settings, they must still be retained and returned to the host
 *  upon request or the host will assume the device is non-functional.
 *
 *  These values are set by the host via a class-specific request, however they are not required to be used accurately.
 *  It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
 *  serial link characteristics and instead sends and receives data in endpoint streams.
 */
static CDC_LineEncoding_t LineEncoding1 = { .BaudRateBPS = 0,
                                            .CharFormat  = CDC_LINEENCODING_OneStopBit,
                                            .ParityType  = CDC_PARITY_None,
                                            .DataBits    = 8                            };

/** Contains the current baud rate and other settings of the second virtual serial port. While this demo does not use
 *  the physical USART and thus does not use these settings, they must still be retained and returned to the host
 *  upon request or the host will assume the device is non-functional.
 *
 *  These values are set by the host via a class-specific request, however they are not required to be used accurately.
 *  It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
 *  serial link characteristics and instead sends and receives data in endpoint streams.
 */
static CDC_LineEncoding_t LineEncoding2 = { .BaudRateBPS = 0,
                                            .CharFormat  = CDC_LINEENCODING_OneStopBit,
                                            .ParityType  = CDC_PARITY_None,
                                            .DataBits    = 8                            };


/** 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 (;;)
	{
		CDC1_Task();
		CDC2_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();
}

/** 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);
}

/** 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 and CDC management tasks.
 */
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 set the current configuration
 *  of the USB device after enumeration - the device endpoints are configured and the CDC management tasks are started.
 */
void EVENT_USB_Device_ConfigurationChanged(void)
{
	bool ConfigSuccess = true;

	/* Setup first CDC Interface's Endpoints */
	ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
	ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
	ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);

	/* Setup second CDC Interface's Endpoints */
	ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
	ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
	ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);

	/* Reset line encoding baud rates so that the host knows to send new values */
	LineEncoding1.BaudRateBPS = 0;
	LineEncoding2.BaudRateBPS = 0;

	/* 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)
{
	/* Determine which interface's Line Coding data is being set from the wIndex parameter */
	void* LineEncodingData = (USB_ControlRequest.wIndex == 0) ? &LineEncoding1 : &LineEncoding2;

	/* Process CDC specific control requests */
	switch (USB_ControlRequest.bRequest)
	{
		case CDC_REQ_GetLineEncoding:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				/* Write the line coding data to the control endpoint */
				Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_LineEncoding_t));
				Endpoint_ClearOUT();
			}

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

				/* Read the line coding data in from the host into the global struct */
				Endpoint_Read_Control_Stream_LE(LineEncodingData, sizeof(CDC_LineEncoding_t));
				Endpoint_ClearIN();
			}

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

			break;
	}
}

/** Function to manage CDC data transmission and reception to and from the host for the first CDC interface, which sends joystick
 *  movements to the host as ASCII strings.
 */
void CDC1_Task(void)
{
	char*       ReportString    = NULL;
	uint8_t     JoyStatus_LCL   = Joystick_GetStatus();
	static bool ActionSent      = false;

	/* Device must be connected and configured for the task to run */
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;

	/* Determine if a joystick action has occurred */
	if (JoyStatus_LCL & JOY_UP)
	  ReportString = "Joystick Up\r\n";
	else if (JoyStatus_LCL & JOY_DOWN)
	  ReportString = "Joystick Down\r\n";
	else if (JoyStatus_LCL & JOY_LEFT)
	  ReportString = "Joystick Left\r\n";
	else if (JoyStatus_LCL & JOY_RIGHT)
	  ReportString = "Joystick Right\r\n";
	else if (JoyStatus_LCL & JOY_PRESS)
	  ReportString = "Joystick Pressed\r\n";
	else
	  ActionSent = false;

	/* Flag management - Only allow one string to be sent per action */
	if ((ReportString != NULL) && (ActionSent == false) && LineEncoding1.BaudRateBPS)
	{
		ActionSent = true;

		/* Select the Serial Tx Endpoint */
		Endpoint_SelectEndpoint(CDC1_TX_EPADDR);

		/* Write the String to the Endpoint */
		Endpoint_Write_Stream_LE(ReportString, strlen(ReportString), NULL);

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

		/* Wait until the endpoint is ready for another packet */
		Endpoint_WaitUntilReady();

		/* Send an empty packet to ensure that the host does not buffer data sent to it */
		Endpoint_ClearIN();
	}

	/* Select the Serial Rx Endpoint */
	Endpoint_SelectEndpoint(CDC1_RX_EPADDR);

	/* Throw away any received data from the host */
	if (Endpoint_IsOUTReceived())
	  Endpoint_ClearOUT();
}

/** Function to manage CDC data transmission and reception to and from the host for the second CDC interface, which echoes back
 *  all data sent to it from the host.
 */
void CDC2_Task(void)
{
	/* Device must be connected and configured for the task to run */
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;

	/* Select the Serial Rx Endpoint */
	Endpoint_SelectEndpoint(CDC2_RX_EPADDR);

	/* Check to see if any data has been received */
	if (Endpoint_IsOUTReceived())
	{
		/* Create a temp buffer big enough to hold the incoming endpoint packet */
		uint8_t  Buffer[Endpoint_BytesInEndpoint()];

		/* Remember how large the incoming packet is */
		uint16_t DataLength = Endpoint_BytesInEndpoint();

		/* Read in the incoming packet into the buffer */
		Endpoint_Read_Stream_LE(&Buffer, DataLength, NULL);

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

		/* Select the Serial Tx Endpoint */
		Endpoint_SelectEndpoint(CDC2_TX_EPADDR);

		/* Write the received data to the endpoint */
		Endpoint_Write_Stream_LE(&Buffer, DataLength, NULL);

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

		/* Wait until the endpoint is ready for the next packet */
		Endpoint_WaitUntilReady();

		/* Send an empty packet to prevent host buffering */
		Endpoint_ClearIN();
	}
}