//***************************************************************************** // // usb_host_keyboard.c - main application code for the host keyboard example. // // Copyright (c) 2012-2014 Texas Instruments Incorporated. All rights reserved. // Software License Agreement // // Texas Instruments (TI) is supplying this software for use solely and // exclusively on TI's microcontroller products. The software is owned by // TI and/or its suppliers, and is protected under applicable copyright // laws. You may not combine this software with "viral" open-source // software in order to form a larger program. // // THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS. // NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT // NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY // CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL // DAMAGES, FOR ANY REASON WHATSOEVER. // // This is part of revision 2.1.0.12573 of the EK-LM4F232 Firmware Package. // //***************************************************************************** #include #include #include "inc/hw_ints.h" #include "inc/hw_memmap.h" #include "inc/hw_types.h" #include "driverlib/gpio.h" #include "driverlib/interrupt.h" #include "driverlib/pin_map.h" #include "driverlib/sysctl.h" #include "driverlib/systick.h" #include "driverlib/rom.h" #include "driverlib/uart.h" #include "grlib/grlib.h" #include "usblib/usblib.h" #include "usblib/usbhid.h" #include "usblib/host/usbhost.h" #include "usblib/host/usbhhid.h" #include "usblib/host/usbhhidkeyboard.h" #include "utils/uartstdio.h" #include "drivers/cfal96x64x16.h" //***************************************************************************** // //! \addtogroup example_list //!

USB HID Keyboard Host (usb_host_keyboard)

//! //! This example application demonstrates how to support a USB keyboard //! attached to the evaluation kit board. The display will show if a keyboard //! is currently connected and the current state of the Caps Lock key on the //! keyboard that is connected on the bottom status area of the screen. //! Pressing any keys on the keyboard will cause them to be printed on the //! screen and to be sent out the UART at 115200 baud with no parity, 8 bits //! and 1 stop bit. Any keyboard that supports the USB HID BIOS protocol //! should work with this demo application. // //***************************************************************************** //***************************************************************************** // // The ASCII code for a backspace character. // //***************************************************************************** #define ASCII_BACKSPACE 0x08 //***************************************************************************** // // The size of the host controller's memory pool in bytes. // //***************************************************************************** #define HCD_MEMORY_SIZE 128 //***************************************************************************** // // The memory pool to provide to the Host controller driver. // //***************************************************************************** uint8_t g_pui8HCDPool[HCD_MEMORY_SIZE]; //***************************************************************************** // // The size of the keyboard device interface's memory pool in bytes. // //***************************************************************************** #define KEYBOARD_MEMORY_SIZE 128 //***************************************************************************** // // The memory pool to provide to the keyboard device. // //***************************************************************************** uint8_t g_pui8Buffer[KEYBOARD_MEMORY_SIZE]; //***************************************************************************** // // Declare the USB Events driver interface. // //***************************************************************************** DECLARE_EVENT_DRIVER(g_sUSBEventDriver, 0, 0, USBHCDEvents); //***************************************************************************** // // The global that holds all of the host drivers in use in the application. // In this case, only the Keyboard class is loaded. // //***************************************************************************** static tUSBHostClassDriver const * const g_ppHostClassDrivers[] = { &g_sUSBHIDClassDriver, &g_sUSBEventDriver }; //***************************************************************************** // // This global holds the number of class drivers in the g_ppHostClassDrivers // list. // //***************************************************************************** static const uint32_t g_ui32NumHostClassDrivers = sizeof(g_ppHostClassDrivers) / sizeof(tUSBHostClassDriver *); //***************************************************************************** // // The number of SysTick ticks per second. // //***************************************************************************** #define TICKS_PER_SECOND 100 #define MS_PER_SYSTICK (1000 / TICKS_PER_SECOND) //***************************************************************************** // // Our running system tick counter and a global used to determine the time // elapsed since last call to GetTickms(). // //***************************************************************************** uint32_t g_ui32SysTickCount; uint32_t g_ui32LastTick; //***************************************************************************** // // Graphics context used to show text on the CSTN display. // //***************************************************************************** tContext g_sContext; //***************************************************************************** // // The global value used to store the keyboard instance value. // //***************************************************************************** static tUSBHKeyboard *g_psKeyboardInstance; //***************************************************************************** // // This enumerated type is used to hold the states of the keyboard. // //***************************************************************************** enum { // // No device is present. // STATE_NO_DEVICE, // // Keyboard has been detected and needs to be initialized in the main // loop. // STATE_KEYBOARD_INIT, // // Keyboard is connected and waiting for events. // STATE_KEYBOARD_CONNECTED, // // Keyboard has received a key press that requires updating the keyboard // in the main loop. // STATE_KEYBOARD_UPDATE, // // An unsupported device has been attached. // STATE_UNKNOWN_DEVICE, // // A power fault has occurred. // STATE_POWER_FAULT } g_eUSBState; extern const tHIDKeyboardUsageTable g_sUSKeyboardMap; //***************************************************************************** // // The current USB operating mode - Host, Device or unknown. // //***************************************************************************** tUSBMode g_eCurrentUSBMode; //***************************************************************************** // // These defines are used to define the screen constraints to the application. // //***************************************************************************** #define DISPLAY_BANNER_HEIGHT 10 #define DISPLAY_BANNER_BG ClrDarkBlue #define DISPLAY_TEXT_BORDER 2 #define DISPLAY_TEXT_FG ClrWhite #define DISPLAY_TEXT_BG ClrBlack //***************************************************************************** // // This variable holds the current status of the modifiers keys. // //***************************************************************************** uint32_t g_ui32Modifiers = 0; //***************************************************************************** // // This is the number of characters that will fit on a line in the text area. // //***************************************************************************** uint32_t g_ui32CharsPerLine; //***************************************************************************** // // This is the number of lines that will fit in the text area. // //***************************************************************************** uint32_t g_ui32LinesPerScreen; //***************************************************************************** // // This is the current line for printing in the text area. // //***************************************************************************** uint32_t g_ui32Line = 0; //***************************************************************************** // // This is the current column for printing in the text area. // //***************************************************************************** uint32_t g_ui32Column = 0; //***************************************************************************** // // The error routine that is called if the driver library encounters an error. // //***************************************************************************** #ifdef DEBUG void __error__(char *pcFilename, uint32_t ui32Line) { } #endif //***************************************************************************** // // This is the handler for this SysTick interrupt. // //***************************************************************************** void SysTickIntHandler(void) { // // Update our tick counter. // g_ui32SysTickCount++; } //***************************************************************************** // // This function prints the character out the UART and into the text area of // the screen. // // \param cChar is the character to print out. // // This function handles all of the detail of printing a character to both the // UART and to the text area of the screen on the evaluation board. The text // area of the screen will be cleared any time the text goes beyond the end // of the text area. // // \return None. // //***************************************************************************** void PrintChar(const char cChar) { tRectangle sRect; // // If both the line and column have gone to zero then clear the screen. // if((g_ui32Line == 0) && (g_ui32Column == 0)) { // // Form the rectangle that makes up the text box. // sRect.i16XMin = 0; sRect.i16YMin = (2 * DISPLAY_BANNER_HEIGHT) + DISPLAY_TEXT_BORDER; sRect.i16XMax = GrContextDpyWidthGet(&g_sContext) - DISPLAY_TEXT_BORDER; sRect.i16YMax = GrContextDpyHeightGet(&g_sContext) - DISPLAY_BANNER_HEIGHT - DISPLAY_TEXT_BORDER; // // Change the foreground color to black and draw black rectangle to // clear the screen. // GrContextForegroundSet(&g_sContext, DISPLAY_TEXT_BG); GrRectFill(&g_sContext, &sRect); // // Reset the foreground color to the text color. // GrContextForegroundSet(&g_sContext, DISPLAY_TEXT_FG); } // // Send the character to the UART. // UARTprintf("%c", cChar); // // Allow new lines to cause the column to go back to zero. // if(cChar != '\n') { // // Did we get a backspace character? // if(cChar != ASCII_BACKSPACE) { // // This is not a backspace so print the character to the screen. // GrStringDraw(&g_sContext, &cChar, 1, GrFontMaxWidthGet(g_psFontFixed6x8) * g_ui32Column, (2 * DISPLAY_BANNER_HEIGHT) + DISPLAY_TEXT_BORDER + (g_ui32Line * GrFontHeightGet(g_psFontFixed6x8)), 0); } else { // // We got a backspace. If we are at the top left of the screen, // return since we don't need to do anything. // if(g_ui32Column || g_ui32Line) { // // Adjust the cursor position to erase the last character. // if(g_ui32Column) { g_ui32Column--; } else { g_ui32Column = g_ui32CharsPerLine; g_ui32Line--; } // // Print a space at this position then return without fixing up // the cursor again. // GrStringDraw(&g_sContext, " ", 1, GrFontMaxWidthGet(g_psFontFixed6x8) * g_ui32Column, (2 * DISPLAY_BANNER_HEIGHT) + DISPLAY_TEXT_BORDER + (g_ui32Line * GrFontHeightGet(g_psFontFixed6x8)), true); } return; } } else { // // This will allow the code below to properly handle the new line. // g_ui32Column = g_ui32CharsPerLine; } // // Update the text row and column that the next character will use. // if(g_ui32Column < g_ui32CharsPerLine) { // // No line wrap yet so move one column over. // g_ui32Column++; } else { // // Line wrapped so go back to the first column and update the line. // g_ui32Column = 0; g_ui32Line++; // // The line has gone past the end so go back to the first line. // if(g_ui32Line >= g_ui32LinesPerScreen) { g_ui32Line = 0; } } } //***************************************************************************** // // This function updates the status area of the screen. It uses the current // state of the application to print the status bar. // //***************************************************************************** void UpdateStatus(void) { tRectangle sRect; // // Fill the bottom rows of the screen with blue to create the status area. // sRect.i16XMin = 0; sRect.i16YMin = GrContextDpyHeightGet(&g_sContext) - DISPLAY_BANNER_HEIGHT - 1; sRect.i16XMax = GrContextDpyWidthGet(&g_sContext) - 1; sRect.i16YMax = sRect.i16YMin + DISPLAY_BANNER_HEIGHT; GrContextForegroundSet(&g_sContext, DISPLAY_BANNER_BG); GrRectFill(&g_sContext, &sRect); // // Put a white box around the banner. // GrContextForegroundSet(&g_sContext, ClrWhite); GrRectDraw(&g_sContext, &sRect); // // Put the application name in the middle of the banner. // GrContextFontSet(&g_sContext, g_psFontFixed6x8); // // Update the status on the screen. // if(g_eUSBState == STATE_NO_DEVICE) { // // Keyboard is currently disconnected. // GrStringDrawCentered(&g_sContext, "no device", -1, GrContextDpyWidthGet(&g_sContext) / 2, sRect.i16YMin + 5, 0); } else if(g_eUSBState == STATE_UNKNOWN_DEVICE) { // // Unknown device is currently connected. // GrStringDrawCentered(&g_sContext, "unknown device", -1, GrContextDpyWidthGet(&g_sContext) / 2, sRect.i16YMin + 5, 0); } else if(g_eUSBState == STATE_POWER_FAULT) { // // Something caused a power fault. // GrStringDrawCentered(&g_sContext, "power fault", -1, GrContextDpyWidthGet(&g_sContext) / 2, sRect.i16YMin + 5, 0); } else if((g_eUSBState == STATE_KEYBOARD_CONNECTED) || (g_eUSBState == STATE_KEYBOARD_UPDATE)) { // // Keyboard is connected. // GrStringDrawCentered(&g_sContext, "connected", -1, GrContextDpyWidthGet(&g_sContext) / 2, sRect.i16YMin + 5, 0); // // Update the CAPS Lock status. // if(g_ui32Modifiers & HID_KEYB_CAPS_LOCK) { GrStringDrawCentered(&g_sContext, "C", GrContextDpyWidthGet(&g_sContext) / 2, sRect.i16XMax - 10, sRect.i16YMin + 5, 0); } } } //***************************************************************************** // // This is the generic callback from host stack. // // pvData is actually a pointer to a tEventInfo structure. // // This function will be called to inform the application when a USB event has // occurred that is outside those related to the keyboard device. At this // point this is used to detect unsupported devices being inserted and removed. // It is also used to inform the application when a power fault has occurred. // This function is required when the g_USBGenericEventDriver is included in // the host controller driver array that is passed in to the // USBHCDRegisterDrivers() function. // //***************************************************************************** void USBHCDEvents(void *pvData) { tEventInfo *pEventInfo; // // Cast this pointer to its actual type. // pEventInfo = (tEventInfo *)pvData; switch(pEventInfo->ui32Event) { // // New keyboard detected. // case USB_EVENT_CONNECTED: { // // See if this is a HID Keyboard. // if((USBHCDDevClass(pEventInfo->ui32Instance, 0) == USB_CLASS_HID) && (USBHCDDevProtocol(pEventInfo->ui32Instance, 0) == USB_HID_PROTOCOL_KEYB)) { // // Indicate that the keyboard has been detected. // UARTprintf("Keyboard Connected\n"); // // Proceed to the STATE_KEYBOARD_INIT state so that the main // loop can finish initialized the mouse since // USBHKeyboardInit() cannot be called from within a callback. // g_eUSBState = STATE_KEYBOARD_INIT; } break; } // // Unsupported device detected. // case USB_EVENT_UNKNOWN_CONNECTED: { UARTprintf("Unsupported Device Class (0x%02x) Connected.\n", pEventInfo->ui32Instance); // // An unknown device was detected. // g_eUSBState = STATE_UNKNOWN_DEVICE; UpdateStatus(); break; } // // Device has been unplugged. // case USB_EVENT_DISCONNECTED: { // // Indicate that the device has been disconnected. // UARTprintf("Device Disconnected\n"); // // Change the state so that the main loop knows that the device // is no longer present. // g_eUSBState = STATE_NO_DEVICE; // // Update the screen. // UpdateStatus(); break; } // // Power Fault occurred. // case USB_EVENT_POWER_FAULT: { UARTprintf("Power Fault\n"); // // No power means no device is present. // g_eUSBState = STATE_POWER_FAULT; UpdateStatus(); break; } default: { break; } } } //***************************************************************************** // // USB Mode callback // // \param ui32Index is the zero-based index of the USB controller making the // callback. // \param eMode indicates the new operating mode. // // This function is called by the USB library whenever an OTG mode change // occurs and, if a connection has been made, informs us of whether we are to // operate as a host or device. // // \return None. // //***************************************************************************** void ModeCallback(uint32_t ui32Index, tUSBMode eMode) { // // Save the new mode. // g_eCurrentUSBMode = eMode; switch(eMode) { case eUSBModeHost: { UARTprintf("\nHost Mode.\n"); break; } case eUSBModeDevice: { UARTprintf("\nDevice Mode.\n"); break; } case eUSBModeNone: { UARTprintf("\nIdle Mode.\n"); break; } default: { UARTprintf("ERROR: Bad Mode!\n"); break; } } } //***************************************************************************** // // This is the callback from the USB HID keyboard handler. // // \param psKbInstance is ignored by this function. // \param ui32Event is one of the valid events for a keyboard device. // \param ui32MsgParam is defined by the event that occurs. // \param pvMsgData is a pointer to data that is defined by the event that // occurs. // // This function will be called to inform the application when a keyboard has // been plugged in or removed and any time a key is pressed or released. // // \return None. // //***************************************************************************** void KeyboardCallback(tUSBHKeyboard *psKbInstance, uint32_t ui32Event, uint32_t ui32MsgParam, void *pvMsgData) { char cChar; switch(ui32Event) { // // New Key press detected. // case USBH_EVENT_HID_KB_PRESS: { // // If this was a Caps Lock key then update the Caps Lock state. // if(ui32MsgParam == HID_KEYB_USAGE_CAPSLOCK) { // // The main loop needs to update the keyboard's Caps Lock // state. // g_eUSBState = STATE_KEYBOARD_UPDATE; // // Toggle the current Caps Lock state. // g_ui32Modifiers ^= HID_KEYB_CAPS_LOCK; // // Update the screen based on the Caps Lock status. // UpdateStatus(); } else if(ui32MsgParam == HID_KEYB_USAGE_SCROLLOCK) { // // The main loop needs to update the keyboard's Scroll Lock // state. // g_eUSBState = STATE_KEYBOARD_UPDATE; // // Toggle the current Scroll Lock state. // g_ui32Modifiers ^= HID_KEYB_SCROLL_LOCK; } else if(ui32MsgParam == HID_KEYB_USAGE_NUMLOCK) { // // The main loop needs to update the keyboard's Scroll Lock // state. // g_eUSBState = STATE_KEYBOARD_UPDATE; // // Toggle the current Num Lock state. // g_ui32Modifiers ^= HID_KEYB_NUM_LOCK; } else { // // Was this the backspace key? // if((uint8_t)ui32MsgParam == HID_KEYB_USAGE_BACKSPACE) { // // Yes - set the ASCII code for a backspace key. This is // not returned by USBHKeyboardUsageToChar since this only // returns printable characters. // cChar = ASCII_BACKSPACE; } else { // // This is not backspace so try to map the usage code to a // printable ASCII character. // cChar = (char) USBHKeyboardUsageToChar(g_psKeyboardInstance, &g_sUSKeyboardMap, (uint8_t)ui32MsgParam); } // // A zero value indicates there was no textual mapping of this // usage code. // if(cChar != 0) { PrintChar(cChar); } } break; } case USBH_EVENT_HID_KB_MOD: { // // This application ignores the state of the shift or control // and other special keys. // break; } case USBH_EVENT_HID_KB_REL: { // // This applications ignores the release of keys as well. // break; } } } //***************************************************************************** // // This function returns the number of ticks since the last time this function // was called. // //***************************************************************************** uint32_t GetTickms(void) { uint32_t ui32RetVal; uint32_t ui32Saved; ui32RetVal = g_ui32SysTickCount; ui32Saved = ui32RetVal; if(ui32Saved > g_ui32LastTick) { ui32RetVal = ui32Saved - g_ui32LastTick; } else { ui32RetVal = g_ui32LastTick - ui32Saved; } // // This could miss a few milliseconds but the timings here are on a // much larger scale. // g_ui32LastTick = ui32Saved; // // Return the number of milliseconds since the last time this was called. // return(ui32RetVal * MS_PER_SYSTICK); } //***************************************************************************** // // Configure the UART and its pins. This must be called before UARTprintf(). // //***************************************************************************** void ConfigureUART(void) { // // Enable the GPIO Peripheral used by the UART. // ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA); // // Enable UART0 // ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); // // Configure GPIO Pins for UART mode. // ROM_GPIOPinConfigure(GPIO_PA0_U0RX); ROM_GPIOPinConfigure(GPIO_PA1_U0TX); ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1); // // Use the internal 16MHz oscillator as the UART clock source. // UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC); // // Initialize the UART for console I/O. // UARTStdioConfig(0, 115200, 16000000); } //***************************************************************************** // // This is the main loop that runs the application. // //***************************************************************************** int main(void) { tRectangle sRect; tUSBMode eLastMode; char *pcString; // // Enable lazy stacking for interrupt handlers. This allows floating-point // instructions to be used within interrupt handlers, but at the expense of // extra stack usage. // ROM_FPULazyStackingEnable(); // // Set the system clock to run at 50MHz from the PLL. // ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ); // // Initially wait for device connection. // g_eUSBState = STATE_NO_DEVICE; eLastMode = eUSBModeOTG; g_eCurrentUSBMode = eUSBModeOTG; // // Enable Clocking to the USB controller. // ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0); // // Configure the required pins for USB operation. // ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB); ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG); ROM_GPIOPinConfigure(GPIO_PG4_USB0EPEN); ROM_GPIOPinTypeUSBDigital(GPIO_PORTG_BASE, GPIO_PIN_4); ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOL); ROM_GPIOPinTypeUSBAnalog(GPIO_PORTL_BASE, GPIO_PIN_6 | GPIO_PIN_7); ROM_GPIOPinTypeUSBAnalog(GPIO_PORTB_BASE, GPIO_PIN_0 | GPIO_PIN_1); // // Configure SysTick for a 100Hz interrupt. // ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / TICKS_PER_SECOND); ROM_SysTickEnable(); ROM_SysTickIntEnable(); // // Enable Interrupts // ROM_IntMasterEnable(); // // Configure UART0 for debug output. // ConfigureUART(); // // Initialize the USB stack mode and pass in a mode callback. // USBStackModeSet(0, eUSBModeOTG, ModeCallback); // // Register the host class drivers. // USBHCDRegisterDrivers(0, g_ppHostClassDrivers, g_ui32NumHostClassDrivers); // // Open an instance of the keyboard driver. The keyboard does not need // to be present at this time, this just save a place for it and allows // the applications to be notified when a keyboard is present. // g_psKeyboardInstance = USBHKeyboardOpen(KeyboardCallback, g_pui8Buffer, KEYBOARD_MEMORY_SIZE); // // Initialize the power configuration. This sets the power enable signal // to be active high and does not enable the power fault. // USBHCDPowerConfigInit(0, USBHCD_VBUS_AUTO_HIGH | USBHCD_VBUS_FILTER); // // Initialize the USB controller for OTG operation with a 2ms polling // rate. // USBOTGModeInit(0, 2000, g_pui8HCDPool, HCD_MEMORY_SIZE); // // Initialize the display driver. // CFAL96x64x16Init(); // // Initialize the graphics context. // GrContextInit(&g_sContext, &g_sCFAL96x64x16); // // Fill the top part of the screen with blue to create the banner. // sRect.i16XMin = 0; sRect.i16YMin = 0; sRect.i16XMax = GrContextDpyWidthGet(&g_sContext) - 1; sRect.i16YMax = (2 * DISPLAY_BANNER_HEIGHT) - 1; GrContextForegroundSet(&g_sContext, DISPLAY_BANNER_BG); GrRectFill(&g_sContext, &sRect); // // Change foreground for white text. // GrContextForegroundSet(&g_sContext, DISPLAY_TEXT_FG); // // Put the application name in the middle of the banner. // GrContextFontSet(&g_sContext, g_psFontFixed6x8); GrStringDrawCentered(&g_sContext, "usb-host-", -1, GrContextDpyWidthGet(&g_sContext) / 2, 4, 0); GrStringDrawCentered(&g_sContext, "keyboard", -1, GrContextDpyWidthGet(&g_sContext) / 2, 14, 0); // // Calculate the number of characters that will fit on a line. // Make sure to leave a small border for the text box. // g_ui32CharsPerLine = (GrContextDpyWidthGet(&g_sContext) - 4) / GrFontMaxWidthGet(g_psFontFixed6x8); // // Calculate the number of lines per usable text screen. This requires // taking off space for the top and bottom banners and adding a small bit // for a border. // g_ui32LinesPerScreen = (GrContextDpyHeightGet(&g_sContext) - (3*(DISPLAY_BANNER_HEIGHT + 1)))/ GrFontHeightGet(g_psFontFixed6x8); // // Open and instance of the keyboard class driver. // UARTprintf("Host Keyboard Application\n"); // // Initial update of the screen. // UpdateStatus(); // // The main loop for the application. // while(1) { // // Tell the OTG library code how much time has passed in // milliseconds since the last call. // USBOTGMain(GetTickms()); // // Has the USB mode changed since last time we checked? // if(g_eCurrentUSBMode != eLastMode) { // // Remember the new mode. // eLastMode = g_eCurrentUSBMode; switch(eLastMode) { case eUSBModeHost: pcString = "HOST"; break; case eUSBModeDevice: pcString = "DEVICE"; break; case eUSBModeNone: pcString = "NONE"; break; default: pcString = "UNKNOWN"; break; } UARTprintf("USB mode changed to %s\n", pcString); } switch(g_eUSBState) { // // This state is entered when they keyboard is first detected. // case STATE_KEYBOARD_INIT: { // // Initialized the newly connected keyboard. // USBHKeyboardInit(g_psKeyboardInstance); // // Proceed to the keyboard connected state. // g_eUSBState = STATE_KEYBOARD_CONNECTED; // // Update the screen now that the keyboard has been // initialized. // UpdateStatus(); USBHKeyboardModifierSet(g_psKeyboardInstance, g_ui32Modifiers); break; } case STATE_KEYBOARD_UPDATE: { // // If the application detected a change that required an // update to be sent to the keyboard to change the modifier // state then call it and return to the connected state. // g_eUSBState = STATE_KEYBOARD_CONNECTED; USBHKeyboardModifierSet(g_psKeyboardInstance, g_ui32Modifiers); break; } case STATE_KEYBOARD_CONNECTED: { // // Nothing is currently done in the main loop when the keyboard // is connected. // break; } case STATE_UNKNOWN_DEVICE: { // // Nothing to do as the device is unknown. // break; } case STATE_NO_DEVICE: { // // Nothing is currently done in the main loop when the keyboard // is not connected. // break; } default: { break; } } } }