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Diffstat (limited to 'Demos/CDC/CDC.c')
| -rw-r--r-- | Demos/CDC/CDC.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/Demos/CDC/CDC.c b/Demos/CDC/CDC.c new file mode 100644 index 000000000..6e232a48b --- /dev/null +++ b/Demos/CDC/CDC.c @@ -0,0 +1,318 @@ +/*
+ 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 CDC demo. This file contains the main tasks of the demo and
+ * is responsible for the initial application hardware configuration.
+ */
+
+#include "CDC.h"
+
+/* Project Tags, for reading out using the ButtLoad project */
+BUTTLOADTAG(ProjName, "LUFA CDC App");
+BUTTLOADTAG(BuildTime, __TIME__);
+BUTTLOADTAG(BuildDate, __DATE__);
+BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);
+
+/* Scheduler Task List */
+TASK_LIST
+{
+ { Task: USB_USBTask , TaskStatus: TASK_STOP },
+ { Task: CDC_Task , TaskStatus: TASK_STOP },
+};
+
+/* Globals: */
+/** Contains the current baud rate and other settings of the 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 recieves data in endpoint streams.
+ */
+CDC_Line_Coding_t LineCoding = { BaudRateBPS: 9600,
+ CharFormat: OneStopBit,
+ ParityType: Parity_None,
+ DataBits: 8 };
+
+/** String to print through the virtual serial port when the joystick is pressed upwards. */
+char JoystickUpString[] = "Joystick Up\r\n";
+
+/** String to print through the virtual serial port when the joystick is pressed downwards. */
+char JoystickDownString[] = "Joystick Down\r\n";
+
+/** String to print through the virtual serial port when the joystick is pressed left. */
+char JoystickLeftString[] = "Joystick Left\r\n";
+
+/** String to print through the virtual serial port when the joystick is pressed right. */
+char JoystickRightString[] = "Joystick Right\r\n";
+
+/** String to print through the virtual serial port when the joystick is pressed inwards. */
+char JoystickPressedString[] = "Joystick Pressed\r\n";
+
+/** 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 */
+ SetSystemClockPrescaler(0);
+
+ /* Hardware Initialization */
+ Joystick_Init();
+ LEDs_Init();
+
+ /* Indicate USB not ready */
+ UpdateStatus(Status_USBNotReady);
+
+ /* Initialize Scheduler so that it can be used */
+ Scheduler_Init();
+
+ /* Initialize USB Subsystem */
+ USB_Init();
+
+ /* Scheduling - routine never returns, so put this last in the main function */
+ Scheduler_Start();
+}
+
+/** 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.
+ */
+EVENT_HANDLER(USB_Connect)
+{
+ /* Start USB management task */
+ Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
+
+ /* Indicate USB enumerating */
+ UpdateStatus(Status_USBEnumerating);
+}
+
+/** 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.
+ */
+EVENT_HANDLER(USB_Disconnect)
+{
+ /* Stop running CDC and USB management tasks */
+ Scheduler_SetTaskMode(CDC_Task, TASK_STOP);
+ Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
+
+ /* Indicate USB not ready */
+ UpdateStatus(Status_USBNotReady);
+}
+
+/** 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 task started.
+ */
+EVENT_HANDLER(USB_ConfigurationChanged)
+{
+ /* Setup CDC Notification, Rx and Tx Endpoints */
+ Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
+ ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
+ ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
+ ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ /* Indicate USB connected and ready */
+ UpdateStatus(Status_USBReady);
+
+ /* Start CDC task */
+ Scheduler_SetTaskMode(CDC_Task, TASK_RUN);
+}
+
+/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
+ * control requests that are not handled internally by the USB library (including the CDC control commands,
+ * which are all issued via the control endpoint), so that they can be handled appropriately for the application.
+ */
+EVENT_HANDLER(USB_UnhandledControlPacket)
+{
+ uint8_t* LineCodingData = (uint8_t*)&LineCoding;
+
+ /* Process CDC specific control requests */
+ switch (bRequest)
+ {
+ case REQ_GetLineEncoding:
+ if (bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ /* Acknowedge the SETUP packet, ready for data transfer */
+ Endpoint_ClearSetupReceived();
+
+ /* Write the line coding data to the control endpoint */
+ Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(CDC_Line_Coding_t));
+
+ /* Finalize the stream transfer to send the last packet or clear the host abort */
+ Endpoint_ClearSetupOUT();
+ }
+
+ break;
+ case REQ_SetLineEncoding:
+ if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ /* Acknowedge the SETUP packet, ready for data transfer */
+ Endpoint_ClearSetupReceived();
+
+ /* Read the line coding data in from the host into the global struct */
+ Endpoint_Read_Control_Stream_LE(LineCodingData, sizeof(CDC_Line_Coding_t));
+
+ /* Finalize the stream transfer to clear the last packet from the host */
+ Endpoint_ClearSetupIN();
+ }
+
+ break;
+ case REQ_SetControlLineState:
+ if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+#if 0
+ /* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
+ lines. The mask is read in from the wValue parameter, and can be masked against the CONTROL_LINE_OUT_* masks
+ to determine the RTS and DTR line states using the following code:
+ */
+
+ uint16_t wIndex = Endpoint_Read_Word_LE();
+
+ // Do something with the given line states in wIndex
+#endif
+
+ /* Acknowedge the SETUP packet, ready for data transfer */
+ Endpoint_ClearSetupReceived();
+
+ /* Send an empty packet to acknowedge the command */
+ Endpoint_ClearSetupIN();
+ }
+
+ break;
+ }
+}
+
+/** 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 CDC_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 | LEDS_LED4);
+ break;
+ }
+
+ /* Set the board LEDs to the new LED mask */
+ LEDs_SetAllLEDs(LEDMask);
+}
+
+/** Function to manage CDC data transmission and reception to and from the host. */
+TASK(CDC_Task)
+{
+ char* ReportString = NULL;
+ uint8_t JoyStatus_LCL = Joystick_GetStatus();
+ static bool ActionSent = false;
+
+#if 0
+ /* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232
+ handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:
+ */
+ USB_Notification_Header_t Notification = (USB_Notification_Header_t)
+ {
+ NotificationType: (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
+ Notification: NOTIF_SerialState,
+ wValue: 0,
+ wIndex: 0,
+ wLength: sizeof(uint16_t),
+ };
+
+ uint16_t LineStateMask;
+
+ // Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host
+
+ Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
+ Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
+ Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));
+ Endpoint_ClearCurrentBank();
+#endif
+
+ /* Determine if a joystick action has occurred */
+ if (JoyStatus_LCL & JOY_UP)
+ ReportString = JoystickUpString;
+ else if (JoyStatus_LCL & JOY_DOWN)
+ ReportString = JoystickDownString;
+ else if (JoyStatus_LCL & JOY_LEFT)
+ ReportString = JoystickLeftString;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ ReportString = JoystickRightString;
+ else if (JoyStatus_LCL & JOY_PRESS)
+ ReportString = JoystickPressedString;
+
+ /* Flag management - Only allow one string to be sent per action */
+ if (ReportString == NULL)
+ {
+ ActionSent = false;
+ }
+ else if (ActionSent == false)
+ {
+ ActionSent = true;
+
+ /* Select the Serial Tx Endpoint */
+ Endpoint_SelectEndpoint(CDC_TX_EPNUM);
+
+ /* Write the String to the Endpoint */
+ Endpoint_Write_Stream_LE(ReportString, strlen(ReportString));
+
+ /* Finalize the stream transfer to send the last packet */
+ Endpoint_ClearCurrentBank();
+ }
+
+ /* Select the Serial Rx Endpoint */
+ Endpoint_SelectEndpoint(CDC_RX_EPNUM);
+
+ /* Throw away any received data from the host */
+ if (Endpoint_ReadWriteAllowed())
+ Endpoint_ClearCurrentBank();
+}
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