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Diffstat (limited to 'Demos/Device/LowLevel/Keyboard/Keyboard.c')
| -rw-r--r-- | Demos/Device/LowLevel/Keyboard/Keyboard.c | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/Demos/Device/LowLevel/Keyboard/Keyboard.c b/Demos/Device/LowLevel/Keyboard/Keyboard.c new file mode 100644 index 000000000..6abd193f4 --- /dev/null +++ b/Demos/Device/LowLevel/Keyboard/Keyboard.c @@ -0,0 +1,424 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Denver Gingerich (denver [at] ossguy [dot] com)
+ Based on code by 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 Keyboard demo. This file contains the main tasks of the demo and
+ * is responsible for the initial application hardware configuration.
+ */
+
+#include "Keyboard.h"
+
+/* Scheduler Task List */
+TASK_LIST
+{
+ { .Task = USB_USBTask , .TaskStatus = TASK_STOP },
+ { .Task = USB_Keyboard_Report , .TaskStatus = TASK_STOP },
+};
+
+/* Global Variables */
+/** Indicates what report mode the host has requested, true for normal HID reporting mode, false for special boot
+ * protocol reporting mode.
+ */
+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).
+ */
+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.
+ */
+uint16_t IdleMSRemaining = 0;
+
+
+/** Main program entry point. This routine configures the hardware required by the application, then
+ * starts the scheduler to run the USB management task.
+ */
+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 */
+ Joystick_Init();
+ LEDs_Init();
+
+ /* Millisecond timer initialization, with output compare interrupt enabled for the idle timing */
+ OCR0A = 0x7D;
+ TCCR0A = (1 << WGM01);
+ TCCR0B = ((1 << CS01) | (1 << CS00));
+ TIMSK0 = (1 << OCIE0A);
+
+ /* 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.
+ */
+void EVENT_USB_Connect(void)
+{
+ /* Start USB management task */
+ Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
+
+ /* Indicate USB enumerating */
+ UpdateStatus(Status_USBEnumerating);
+
+ /* 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_Disconnect(void)
+{
+ /* Stop running keyboard reporting and USB management tasks */
+ Scheduler_SetTaskMode(USB_Keyboard_Report, 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 sets the current configuration
+ * of the USB device after enumeration, and configures the keyboard device endpoints.
+ */
+void EVENT_USB_ConfigurationChanged(void)
+{
+ /* Setup Keyboard Keycode Report Endpoint */
+ Endpoint_ConfigureEndpoint(KEYBOARD_EPNUM, EP_TYPE_INTERRUPT,
+ ENDPOINT_DIR_IN, KEYBOARD_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ /* Setup Keyboard LED Report Endpoint */
+ Endpoint_ConfigureEndpoint(KEYBOARD_LEDS_EPNUM, EP_TYPE_INTERRUPT,
+ ENDPOINT_DIR_OUT, KEYBOARD_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ /* Indicate USB connected and ready */
+ UpdateStatus(Status_USBReady);
+
+ /* Start running keyboard reporting task */
+ Scheduler_SetTaskMode(USB_Keyboard_Report, 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 HID commands, which are
+ * all issued via the control endpoint), so that they can be handled appropriately for the application.
+ */
+void EVENT_USB_UnhandledControlPacket(void)
+{
+ /* Handle HID Class specific requests */
+ switch (USB_ControlRequest.bRequest)
+ {
+ case REQ_GetReport:
+ if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ USB_KeyboardReport_Data_t KeyboardReportData;
+
+ Endpoint_ClearSETUP();
+
+ /* Create the next keyboard report for transmission to the host */
+ CreateKeyboardReport(&KeyboardReportData);
+
+ /* Write the report data to the control endpoint */
+ Endpoint_Write_Control_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
+
+ /* 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))
+ {
+ Endpoint_ClearSETUP();
+
+ /* Wait until the LED report has been sent by the host */
+ while (!(Endpoint_IsOUTReceived()));
+
+ /* Read in the LED report from the host */
+ uint8_t LEDStatus = Endpoint_Read_Byte();
+
+ /* Process the incoming LED report */
+ ProcessLEDReport(LEDStatus);
+
+ /* Clear the endpoint data */
+ Endpoint_ClearOUT();
+
+ /* Acknowledge status stage */
+ while (!(Endpoint_IsINReady()));
+ Endpoint_ClearIN();
+ }
+
+ break;
+ case REQ_GetProtocol:
+ if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ Endpoint_ClearSETUP();
+
+ /* Write the current protocol flag to the host */
+ Endpoint_Write_Byte(UsingReportProtocol);
+
+ /* Send the flag to the host */
+ Endpoint_ClearIN();
+
+ /* Acknowledge status stage */
+ while (!(Endpoint_IsOUTReceived()));
+ Endpoint_ClearOUT();
+ }
+
+ break;
+ case REQ_SetProtocol:
+ if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ Endpoint_ClearSETUP();
+
+ /* Set or clear the flag depending on what the host indicates that the current Protocol should be */
+ UsingReportProtocol = (USB_ControlRequest.wValue != 0);
+
+ /* Acknowledge status stage */
+ while (!(Endpoint_IsINReady()));
+ Endpoint_ClearIN();
+ }
+
+ break;
+ case REQ_SetIdle:
+ if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ Endpoint_ClearSETUP();
+
+ /* Get idle period in MSB */
+ IdleCount = (USB_ControlRequest.wValue >> 8);
+
+ /* Acknowledge status stage */
+ while (!(Endpoint_IsINReady()));
+ Endpoint_ClearIN();
+ }
+
+ break;
+ case REQ_GetIdle:
+ if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
+ {
+ Endpoint_ClearSETUP();
+
+ /* Write the current idle duration to the host */
+ Endpoint_Write_Byte(IdleCount);
+
+ /* Send the flag to the host */
+ Endpoint_ClearIN();
+
+ /* Acknowledge status stage */
+ while (!(Endpoint_IsOUTReceived()));
+ Endpoint_ClearOUT();
+ }
+
+ break;
+ }
+}
+
+/** ISR for the timer 0 compare vector. This ISR fires once each millisecond, and increments the
+ * scheduler elapsed idle period counter when the host has set an idle period.
+ */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)
+{
+ /* 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 ReportData Pointer to a HID report data structure to be filled
+ */
+void CreateKeyboardReport(USB_KeyboardReport_Data_t* ReportData)
+{
+ uint8_t JoyStatus_LCL = Joystick_GetStatus();
+
+ /* Clear the report contents */
+ memset(ReportData, 0, sizeof(USB_KeyboardReport_Data_t));
+
+ if (JoyStatus_LCL & JOY_UP)
+ ReportData->KeyCode[0] = 0x04; // A
+ else if (JoyStatus_LCL & JOY_DOWN)
+ ReportData->KeyCode[0] = 0x05; // B
+
+ if (JoyStatus_LCL & JOY_LEFT)
+ ReportData->KeyCode[0] = 0x06; // C
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ ReportData->KeyCode[0] = 0x07; // D
+
+ if (JoyStatus_LCL & JOY_PRESS)
+ ReportData->KeyCode[0] = 0x08; // E
+}
+
+/** Processes a received LED report, and updates the board LEDs states to match.
+ *
+ * \param LEDReport LED status report from the host
+ */
+void ProcessLEDReport(uint8_t LEDReport)
+{
+ uint8_t LEDMask = LEDS_LED2;
+
+ if (LEDReport & 0x01) // NUM Lock
+ LEDMask |= LEDS_LED1;
+
+ if (LEDReport & 0x02) // CAPS Lock
+ LEDMask |= LEDS_LED3;
+
+ if (LEDReport & 0x04) // SCROLL Lock
+ 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 = true;
+
+ /* Create the next keyboard report for transmission to the host */
+ CreateKeyboardReport(&KeyboardReportData);
+
+ /* 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);
+
+ /* Save the current report data for later comparison to check for changes */
+ PrevKeyboardReportData = KeyboardReportData;
+
+ /* Check if the idle period is set and has elapsed */
+ if ((IdleCount != HID_IDLE_CHANGESONLY) && (!(IdleMSRemaining)))
+ {
+ /* Reset the idle time remaining counter, must multiply by 4 to get the duration in milliseconds */
+ IdleMSRemaining = (IdleCount << 2);
+
+ /* Idle period is set and has elapsed, must send a report to the host */
+ SendReport = true;
+ }
+
+ /* Select the Keyboard Report Endpoint */
+ Endpoint_SelectEndpoint(KEYBOARD_EPNUM);
+
+ /* Check if Keyboard Endpoint Ready for Read/Write and if we should send a new report */
+ if (Endpoint_IsReadWriteAllowed() && SendReport)
+ {
+ /* Write Keyboard Report Data */
+ Endpoint_Write_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
+
+ /* 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_LEDS_EPNUM);
+
+ /* 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_Byte();
+
+ /* 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 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 Keyboard_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 HID report generation and transmission to the host, when in report mode. */
+TASK(USB_Keyboard_Report)
+{
+ /* Check if the USB system is connected to a host */
+ if (USB_IsConnected)
+ {
+ /* Send the next keypress report to the host */
+ SendNextReport();
+
+ /* Process the LED report sent from the host */
+ ReceiveNextReport();
+ }
+}
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