Add incomplete Android Accessory Host LowLevel demo.
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Dean Camera
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2011.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the AndroidAccessoryHost demo. This file contains the main tasks
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* of the demo and is responsible for the initial application hardware configuration.
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*/
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#include "AndroidAccessoryHost.h"
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/** Main program entry point. This routine configures the hardware required by the application, then
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* enters a loop to run the application tasks in sequence.
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*/
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int main(void)
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{
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SetupHardware();
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puts_P(PSTR(ESC_FG_CYAN "Android Accessory Host Demo running.\r\n" ESC_FG_WHITE));
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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sei();
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for (;;)
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{
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Android_Host_Task();
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USB_USBTask();
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Hardware Initialization */
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Serial_Init(9600, false);
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LEDs_Init();
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USB_Init();
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/* Create a stdio stream for the serial port for stdin and stdout */
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Serial_CreateStream(NULL);
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}
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/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
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* starts the library USB task to begin the enumeration and USB management process.
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*/
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void EVENT_USB_Host_DeviceAttached(void)
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{
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puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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}
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/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
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* stops the library USB task management process.
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*/
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void EVENT_USB_Host_DeviceUnattached(void)
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{
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puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
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* enumerated by the host and is now ready to be used by the application.
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*/
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void EVENT_USB_Host_DeviceEnumerationComplete(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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}
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/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
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void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
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{
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USB_Disable();
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printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
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" -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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for(;;);
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}
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/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
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* enumerating an attached USB device.
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*/
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void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
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const uint8_t SubErrorCode)
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{
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printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
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" -- Error Code %d\r\n"
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" -- Sub Error Code %d\r\n"
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" -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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/** Task to set the configuration of the attached device after it has been enumerated. */
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void Android_Host_Task(void)
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{
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uint8_t ErrorCode;
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switch (USB_HostState)
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{
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case HOST_STATE_Addressed:
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puts_P(PSTR("Getting Device Data.\r\n"));
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/* Get and process the configuration descriptor data */
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ErrorCode = ProcessDeviceDescriptor();
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/* Save whether the Android device needs to be mode-switched later on */
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bool RequiresModeSwitch = (ErrorCode == NonAccessoryModeAndroidDevice);
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/* Error out if the device is not an Android device or an error ocurred */
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if ((ErrorCode != AccessoryModeAndroidDevice) && !(RequiresModeSwitch))
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{
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if (ErrorCode == DevControlError)
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puts_P(PSTR(ESC_FG_RED "Control Error (Get Device).\r\n"));
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else
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puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
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printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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/* Indicate error via status LEDs */
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LEDs_SetAllLEDs(LEDS_LED1);
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/* Wait until USB device disconnected */
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USB_HostState = HOST_STATE_WaitForDeviceRemoval;
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break;
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}
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printf_P(PSTR("Android Device Detected - %sAccessory mode.\r\n"), (RequiresModeSwitch ? "Non-" : ""));
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/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
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if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
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{
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printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
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" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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/* Indicate error via status LEDs */
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LEDs_SetAllLEDs(LEDS_LED1);
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/* Wait until USB device disconnected */
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USB_HostState = HOST_STATE_WaitForDeviceRemoval;
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break;
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}
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/* Check if a valid Android device was attached, but it is not current in Accessory mode */
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if (RequiresModeSwitch)
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{
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USB_ControlRequest = (USB_Request_Header_t)
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{
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.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_VENDOR | REQREC_DEVICE),
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.bRequest = ANDROID_Req_StartAccessoryMode,
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.wValue = 0,
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.wIndex = 0,
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.wLength = 0,
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};
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/* Send the control request for the Android device to switch to accessory mode */
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Pipe_SelectPipe(PIPE_CONTROLPIPE);
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USB_Host_SendControlRequest(NULL);
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/* Wait until USB device disconnected */
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USB_HostState = HOST_STATE_WaitForDeviceRemoval;
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break;
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}
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puts_P(PSTR("Getting Config Data.\r\n"));
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/* Get and process the configuration descriptor data */
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if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
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{
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if (ErrorCode == ControlError)
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puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
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else
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puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
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printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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/* Indicate error via status LEDs */
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LEDs_SetAllLEDs(LEDS_LED1);
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/* Wait until USB device disconnected */
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USB_HostState = HOST_STATE_WaitForDeviceRemoval;
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break;
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}
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puts_P(PSTR("Accessory Mode Android Enumerated.\r\n"));
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USB_HostState = HOST_STATE_Configured;
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break;
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case HOST_STATE_Configured:
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/* Select the data IN pipe */
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Pipe_SelectPipe(ANDROID_DATA_IN_PIPE);
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Pipe_Unfreeze();
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/* Check to see if a packet has been received */
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if (Pipe_IsINReceived())
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{
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/* Re-freeze IN pipe after the packet has been received */
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Pipe_Freeze();
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/* Check if data is in the pipe */
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if (Pipe_IsReadWriteAllowed())
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{
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uint8_t NextReceivedByte = Pipe_BytesInPipe();
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uint8_t LEDMask = LEDS_NO_LEDS;
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if (NextReceivedByte & 0x01)
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LEDMask |= LEDS_LED1;
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if (NextReceivedByte & 0x02)
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LEDMask |= LEDS_LED2;
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if (NextReceivedByte & 0x04)
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LEDMask |= LEDS_LED3;
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if (NextReceivedByte & 0x08)
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LEDMask |= LEDS_LED4;
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LEDs_SetAllLEDs(LEDMask);
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}
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else
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{
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/* Clear the pipe after all data in the packet has been read, ready for the next packet */
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Pipe_ClearIN();
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}
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}
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/* Re-freeze IN pipe after use */
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Pipe_Freeze();
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break;
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}
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}
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