From c3e4c9a25c2910d2d66d52215b3406b13d5b23d5 Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Sun, 29 Jun 2014 12:34:32 +0300 Subject: Add more board models --- .../ek-lm4f232/usb_dev_keyboard/usb_dev_keyboard.c | 731 +++++++++++++++++++++ 1 file changed, 731 insertions(+) create mode 100644 boards/ek-lm4f232/usb_dev_keyboard/usb_dev_keyboard.c (limited to 'boards/ek-lm4f232/usb_dev_keyboard/usb_dev_keyboard.c') diff --git a/boards/ek-lm4f232/usb_dev_keyboard/usb_dev_keyboard.c b/boards/ek-lm4f232/usb_dev_keyboard/usb_dev_keyboard.c new file mode 100644 index 0000000..028e97c --- /dev/null +++ b/boards/ek-lm4f232/usb_dev_keyboard/usb_dev_keyboard.c @@ -0,0 +1,731 @@ +//***************************************************************************** +// +// usb_dev_keyboard.c - Main routines for the keyboard example. +// +// Copyright (c) 2011-2014 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_memmap.h" +#include "inc/hw_types.h" +#include "inc/hw_gpio.h" +#include "inc/hw_sysctl.h" +#include "driverlib/debug.h" +#include "driverlib/fpu.h" +#include "driverlib/gpio.h" +#include "driverlib/pin_map.h" +#include "driverlib/rom.h" +#include "driverlib/sysctl.h" +#include "driverlib/systick.h" +#include "grlib/grlib.h" +#include "grlib/widget.h" +#include "usblib/usblib.h" +#include "usblib/usbhid.h" +#include "usblib/device/usbdevice.h" +#include "usblib/device/usbdhid.h" +#include "usblib/device/usbdhidkeyb.h" +#include "drivers/cfal96x64x16.h" +#include "drivers/buttons.h" +#include "usb_keyb_structs.h" + +//***************************************************************************** +// +//! \addtogroup example_list +//!

USB HID Keyboard Device (usb_dev_keyboard)

+//! +//! This example application turns the evaluation board into a USB keyboard +//! supporting the Human Interface Device class. When the push button is +//! pressed, a sequence of key presses is simulated to type a string. Care +//! should be taken to ensure that the active window can safely receive the +//! text; enter is not pressed at any point so no actions are attempted by the +//! host if a terminal window is used (for example). The status LED is used to +//! indicate the current Caps Lock state and is updated in response to any +//! other keyboard attached to the same USB host system. +//! +//! The device implemented by this application also supports USB remote wakeup +//! allowing it to request the host to reactivate a suspended bus. If the bus +//! is suspended (as indicated on the application display), pressing the +//! push button will request a remote wakeup assuming the host has not +//! specifically disabled such requests. +//! +// +//***************************************************************************** + +//***************************************************************************** +// +// The system tick timer period. +// +//***************************************************************************** +#define SYSTICKS_PER_SECOND 100 + +//***************************************************************************** +// +// A mapping from the ASCII value received from the UART to the corresponding +// USB HID usage code. +// +//***************************************************************************** +static const int8_t g_ppi8KeyUsageCodes[][2] = +{ + { 0, HID_KEYB_USAGE_SPACE }, // 0x20 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_1 }, // ! 0x21 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_FQUOTE }, // " 0x22 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_3 }, // # 0x23 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_4 }, // $ 0x24 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_5 }, // % 0x25 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_7 }, // & 0x26 + { 0, HID_KEYB_USAGE_FQUOTE }, // ' 0x27 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_9 }, // ( 0x28 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_0 }, // ) 0x29 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_8 }, // * 0x2a + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_EQUAL }, // + 0x2b + { 0, HID_KEYB_USAGE_COMMA }, // , 0x2c + { 0, HID_KEYB_USAGE_MINUS }, // - 0x2d + { 0, HID_KEYB_USAGE_PERIOD }, // . 0x2e + { 0, HID_KEYB_USAGE_FSLASH }, // / 0x2f + { 0, HID_KEYB_USAGE_0 }, // 0 0x30 + { 0, HID_KEYB_USAGE_1 }, // 1 0x31 + { 0, HID_KEYB_USAGE_2 }, // 2 0x32 + { 0, HID_KEYB_USAGE_3 }, // 3 0x33 + { 0, HID_KEYB_USAGE_4 }, // 4 0x34 + { 0, HID_KEYB_USAGE_5 }, // 5 0x35 + { 0, HID_KEYB_USAGE_6 }, // 6 0x36 + { 0, HID_KEYB_USAGE_7 }, // 7 0x37 + { 0, HID_KEYB_USAGE_8 }, // 8 0x38 + { 0, HID_KEYB_USAGE_9 }, // 9 0x39 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_SEMICOLON }, // : 0x3a + { 0, HID_KEYB_USAGE_SEMICOLON }, // ; 0x3b + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_COMMA }, // < 0x3c + { 0, HID_KEYB_USAGE_EQUAL }, // = 0x3d + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_PERIOD }, // > 0x3e + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_FSLASH }, // ? 0x3f + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_2 }, // @ 0x40 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_A }, // A 0x41 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_B }, // B 0x42 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_C }, // C 0x43 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_D }, // D 0x44 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_E }, // E 0x45 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_F }, // F 0x46 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_G }, // G 0x47 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_H }, // H 0x48 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_I }, // I 0x49 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_J }, // J 0x4a + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_K }, // K 0x4b + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_L }, // L 0x4c + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_M }, // M 0x4d + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_N }, // N 0x4e + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_O }, // O 0x4f + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_P }, // P 0x50 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_Q }, // Q 0x51 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_R }, // R 0x52 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_S }, // S 0x53 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_T }, // T 0x54 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_U }, // U 0x55 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_V }, // V 0x56 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_W }, // W 0x57 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_X }, // X 0x58 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_Y }, // Y 0x59 + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_Z }, // Z 0x5a + { 0, HID_KEYB_USAGE_LBRACKET }, // [ 0x5b + { 0, HID_KEYB_USAGE_BSLASH }, // \ 0x5c + { 0, HID_KEYB_USAGE_RBRACKET }, // ] 0x5d + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_6 }, // ^ 0x5e + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_MINUS }, // _ 0x5f + { 0, HID_KEYB_USAGE_BQUOTE }, // ` 0x60 + { 0, HID_KEYB_USAGE_A }, // a 0x61 + { 0, HID_KEYB_USAGE_B }, // b 0x62 + { 0, HID_KEYB_USAGE_C }, // c 0x63 + { 0, HID_KEYB_USAGE_D }, // d 0x64 + { 0, HID_KEYB_USAGE_E }, // e 0x65 + { 0, HID_KEYB_USAGE_F }, // f 0x66 + { 0, HID_KEYB_USAGE_G }, // g 0x67 + { 0, HID_KEYB_USAGE_H }, // h 0x68 + { 0, HID_KEYB_USAGE_I }, // i 0x69 + { 0, HID_KEYB_USAGE_J }, // j 0x6a + { 0, HID_KEYB_USAGE_K }, // k 0x6b + { 0, HID_KEYB_USAGE_L }, // l 0x6c + { 0, HID_KEYB_USAGE_M }, // m 0x6d + { 0, HID_KEYB_USAGE_N }, // n 0x6e + { 0, HID_KEYB_USAGE_O }, // o 0x6f + { 0, HID_KEYB_USAGE_P }, // p 0x70 + { 0, HID_KEYB_USAGE_Q }, // q 0x71 + { 0, HID_KEYB_USAGE_R }, // r 0x72 + { 0, HID_KEYB_USAGE_S }, // s 0x73 + { 0, HID_KEYB_USAGE_T }, // t 0x74 + { 0, HID_KEYB_USAGE_U }, // u 0x75 + { 0, HID_KEYB_USAGE_V }, // v 0x76 + { 0, HID_KEYB_USAGE_W }, // w 0x77 + { 0, HID_KEYB_USAGE_X }, // x 0x78 + { 0, HID_KEYB_USAGE_Y }, // y 0x79 + { 0, HID_KEYB_USAGE_Z }, // z 0x7a + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_LBRACKET }, // { 0x7b + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_BSLASH }, // | 0x7c + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_RBRACKET }, // } 0x7d + { HID_KEYB_LEFT_SHIFT, HID_KEYB_USAGE_BQUOTE }, // ~ 0x7e +}; + +//***************************************************************************** +// +// This global indicates whether or not we are connected to a USB host. +// +//***************************************************************************** +volatile bool g_bConnected = false; + +//***************************************************************************** +// +// This global indicates whether or not the USB bus is currently in the suspend +// state. +// +//***************************************************************************** +volatile bool g_bSuspended = false; + +//***************************************************************************** +// +// Global system tick counter holds elapsed time since the application started +// expressed in 100ths of a second. +// +//***************************************************************************** +volatile uint32_t g_ui32SysTickCount; + +//***************************************************************************** +// +// The number of system ticks to wait for each USB packet to be sent before +// we assume the host has disconnected. The value 50 equates to half a second. +// +//***************************************************************************** +#define MAX_SEND_DELAY 50 + +//***************************************************************************** +// +// This global is set to true if the host sends a request to set or clear +// any keyboard LED. +// +//***************************************************************************** +volatile bool g_bDisplayUpdateRequired; + +//***************************************************************************** +// +// This enumeration holds the various states that the keyboard can be in during +// normal operation. +// +//***************************************************************************** +volatile enum +{ + // + // Unconfigured. + // + STATE_UNCONFIGURED, + + // + // No keys to send and not waiting on data. + // + STATE_IDLE, + + // + // Waiting on data to be sent out. + // + STATE_SENDING +} +g_eKeyboardState = STATE_UNCONFIGURED; + +//***************************************************************************** +// +// The error routine that is called if the driver library encounters an error. +// +//***************************************************************************** +#ifdef DEBUG +void +__error__(char *pcFilename, uint32_t ui32Line) +{ +} +#endif + +//***************************************************************************** +// +// Handles asynchronous events from the HID keyboard driver. +// +// \param pvCBData is the event callback pointer provided during +// USBDHIDKeyboardInit(). This is a pointer to our keyboard device structure +// (&g_sKeyboardDevice). +// \param ui32Event identifies the event we are being called back for. +// \param ui32MsgData is an event-specific value. +// \param pvMsgData is an event-specific pointer. +// +// This function is called by the HID keyboard driver to inform the application +// of particular asynchronous events related to operation of the keyboard HID +// device. +// +// \return Returns 0 in all cases. +// +//***************************************************************************** +uint32_t +KeyboardHandler(void *pvCBData, uint32_t ui32Event, uint32_t ui32MsgData, + void *pvMsgData) +{ + switch (ui32Event) + { + // + // The host has connected to us and configured the device. + // + case USB_EVENT_CONNECTED: + { + g_bConnected = true; + g_bSuspended = false; + break; + } + + // + // The host has disconnected from us. + // + case USB_EVENT_DISCONNECTED: + { + g_bConnected = false; + break; + } + + // + // We receive this event every time the host acknowledges transmission + // of a report. It is used here purely as a way of determining whether + // the host is still talking to us or not. + // + case USB_EVENT_TX_COMPLETE: + { + // + // Enter the idle state since we finished sending something. + // + g_eKeyboardState = STATE_IDLE; + break; + } + + // + // This event indicates that the host has suspended the USB bus. + // + case USB_EVENT_SUSPEND: + { + g_bSuspended = true; + break; + } + + // + // This event signals that the host has resumed signalling on the bus. + // + case USB_EVENT_RESUME: + { + g_bSuspended = false; + break; + } + + // + // This event indicates that the host has sent us an Output or + // Feature report and that the report is now in the buffer we provided + // on the previous USBD_HID_EVENT_GET_REPORT_BUFFER callback. + // + case USBD_HID_KEYB_EVENT_SET_LEDS: + { + // + // Set the LED to match the current state of the caps lock LED. + // + ROM_GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2, + (ui32MsgData & HID_KEYB_CAPS_LOCK) ? GPIO_PIN_2 : + 0); + + break; + } + + // + // We ignore all other events. + // + default: + { + break; + } + } + + return(0); +} + +//*************************************************************************** +// +// Wait for a period of time for the state to become idle. +// +// \param ui32TimeoutTick is the number of system ticks to wait before +// declaring a timeout and returning \b false. +// +// This function polls the current keyboard state for ui32TimeoutTicks system +// ticks waiting for it to become idle. If the state becomes idle, the +// function returns true. If it ui32TimeoutTicks occur prior to the state +// becoming idle, false is returned to indicate a timeout. +// +// \return Returns \b true on success or \b false on timeout. +// +//*************************************************************************** +bool +WaitForSendIdle(uint_fast32_t ui32TimeoutTicks) +{ + uint32_t ui32Start; + uint32_t ui32Now; + uint32_t ui32Elapsed; + + ui32Start = g_ui32SysTickCount; + ui32Elapsed = 0; + + while(ui32Elapsed < ui32TimeoutTicks) + { + // + // Is the keyboard is idle, return immediately. + // + if(g_eKeyboardState == STATE_IDLE) + { + return(true); + } + + // + // Determine how much time has elapsed since we started waiting. This + // should be safe across a wrap of g_ui32SysTickCount. + // + ui32Now = g_ui32SysTickCount; + ui32Elapsed = ((ui32Start < ui32Now) ? (ui32Now - ui32Start) : + (((uint32_t)0xFFFFFFFF - ui32Start) + ui32Now + 1)); + } + + // + // If we get here, we timed out so return a bad return code to let the + // caller know. + // + return(false); +} + +//***************************************************************************** +// +// Sends a string of characters via the USB HID keyboard interface. +// +//***************************************************************************** +void +SendString(char *pcStr) +{ + uint32_t ui32Char; + + // + // Loop while there are more characters in the string. + // + while(*pcStr) + { + // + // Get the next character from the string. + // + ui32Char = *pcStr++; + + // + // Skip this character if it is a non-printable character. + // + if((ui32Char < ' ') || (ui32Char > '~')) + { + continue; + } + + // + // Convert the character into an index into the keyboard usage code + // table. + // + ui32Char -= ' '; + + // + // Send the key press message. + // + g_eKeyboardState = STATE_SENDING; + if(USBDHIDKeyboardKeyStateChange((void *)&g_sKeyboardDevice, + g_ppi8KeyUsageCodes[ui32Char][0], + g_ppi8KeyUsageCodes[ui32Char][1], + true) != KEYB_SUCCESS) + { + return; + } + + // + // Wait until the key press message has been sent. + // + if(!WaitForSendIdle(MAX_SEND_DELAY)) + { + g_bConnected = 0; + return; + } + + // + // Send the key release message. + // + g_eKeyboardState = STATE_SENDING; + if(USBDHIDKeyboardKeyStateChange((void *)&g_sKeyboardDevice, + 0, g_ppi8KeyUsageCodes[ui32Char][1], + false) != KEYB_SUCCESS) + { + return; + } + + // + // Wait until the key release message has been sent. + // + if(!WaitForSendIdle(MAX_SEND_DELAY)) + { + g_bConnected = 0; + return; + } + } +} + +//***************************************************************************** +// +// This is the interrupt handler for the SysTick interrupt. It is used to +// update our local tick count which, in turn, is used to check for transmit +// timeouts. +// +//***************************************************************************** +void +SysTickIntHandler(void) +{ + g_ui32SysTickCount++; +} + +//***************************************************************************** +// +// This is the main loop that runs the application. +// +//***************************************************************************** +int +main(void) +{ + uint_fast32_t ui32LastTickCount; + bool bLastSuspend; + tRectangle sRect; + tContext sContext; + int_fast32_t i32CenterX; + + // + // 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 clocking to run from the PLL at 50MHz. + // + ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | + SYSCTL_XTAL_16MHZ); + + // + // 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); + + // + // Erratum workaround for silicon revision A1. VBUS must have pull-down. + // + if(CLASS_IS_TM4C123 && REVISION_IS_A1) + { + HWREG(GPIO_PORTB_BASE + GPIO_O_PDR) |= GPIO_PIN_1; + } + + // + // Enable the GPIO that is used for the on-board LED. + // + ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG); + ROM_GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_2); + ROM_GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2, 0); + + // + // Initialize the buttons driver + // + ButtonsInit(); + + // + // Initialize the display driver. + // + CFAL96x64x16Init(); + + // + // Initialize the graphics context and find the middle X coordinate. + // + GrContextInit(&sContext, &g_sCFAL96x64x16); + i32CenterX = GrContextDpyWidthGet(&sContext) / 2; + + // + // Fill the top part of the screen with blue to create the banner. + // + sRect.i16XMin = 0; + sRect.i16YMin = 0; + sRect.i16XMax = GrContextDpyWidthGet(&sContext) - 1; + sRect.i16YMax = 9; + GrContextForegroundSet(&sContext, ClrDarkBlue); + GrRectFill(&sContext, &sRect); + + // + // Change foreground for white text. + // + GrContextForegroundSet(&sContext, ClrWhite); + + // + // Put the application name in the middle of the banner. + // + GrContextFontSet(&sContext, g_psFontFixed6x8); + GrStringDrawCentered(&sContext, "usb-dev-keyboard", -1, i32CenterX, 4, 0); + + // + // Not configured initially. + // + g_bConnected = false; + g_bSuspended = false; + bLastSuspend = false; + + // + // Initialize the USB stack for device mode. + // + USBStackModeSet(0, eUSBModeDevice, 0); + + // + // Pass our device information to the USB HID device class driver, + // initialize the USB + // controller and connect the device to the bus. + // + USBDHIDKeyboardInit(0, &g_sKeyboardDevice); + + // + // Set the system tick to fire 100 times per second. + // + ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / SYSTICKS_PER_SECOND); + ROM_SysTickIntEnable(); + ROM_SysTickEnable(); + + // + // The main loop starts here. We begin by waiting for a host connection + // then drop into the main keyboard handling section. If the host + // disconnects, we return to the top and wait for a new connection. + // + while(1) + { + uint8_t ui8Buttons; + uint8_t ui8ButtonsChanged; + + // + // Tell the user what we are doing and provide some basic instructions. + // + GrStringDrawCentered(&sContext, " Waiting ", + -1, i32CenterX, 22, 1); + GrStringDrawCentered(&sContext, " for host ... ", -1, + i32CenterX, 32, 1); + + // + // Wait here until USB device is connected to a host. + // + while(!g_bConnected) + { + } + + // + // Update the status. + // + GrStringDrawCentered(&sContext, " Host ", + -1, i32CenterX, 22, 1); + GrStringDrawCentered(&sContext, " connected ... ", + -1, i32CenterX, 32, 1); + + // + // Enter the idle state. + // + g_eKeyboardState = STATE_IDLE; + + // + // Assume that the bus is not currently suspended if we have just been + // configured. + // + bLastSuspend = false; + + // + // Keep transferring characters from the UART to the USB host for as + // long as we are connected to the host. + // + while(g_bConnected) + { + // + // Remember the current time. + // + ui32LastTickCount = g_ui32SysTickCount; + + // + // Has the suspend state changed since last time we checked? + // + if(bLastSuspend != g_bSuspended) + { + // + // Yes - the state changed so update the display. + // + bLastSuspend = g_bSuspended; + if(bLastSuspend) + { + GrStringDrawCentered(&sContext, " Bus ", -1, + i32CenterX, 22, 1); + GrStringDrawCentered(&sContext, " suspended ... ", -1, + i32CenterX, 32, 1); + } + else + { + GrStringDrawCentered(&sContext, " Host ", -1, + i32CenterX, 22, 1); + GrStringDrawCentered(&sContext, " connected ... ", + -1, i32CenterX, 32, 1); + } + } + + // + // See if the button was just pressed. + // + ui8Buttons = ButtonsPoll(&ui8ButtonsChanged, 0); + if(BUTTON_PRESSED(SELECT_BUTTON, ui8Buttons, ui8ButtonsChanged)) + { + // + // If the bus is suspended then resume it. Otherwise, type + // some "random" characters. + // + if(g_bSuspended) + { + USBDHIDKeyboardRemoteWakeupRequest( + (void *)&g_sKeyboardDevice); + } + else + { + SendString("Make the Switch to TI Microcontrollers!"); + } + } + + // + // Wait for at least 1 system tick to have gone by before we poll + // the buttons again. + // + while(g_ui32SysTickCount == ui32LastTickCount) + { + } + } + } +} -- cgit v1.3.1