--- /dev/null
+/*\r
+ LUFA Library\r
+ Copyright (C) Dean Camera, 2011.\r
+\r
+ dean [at] fourwalledcubicle [dot] com\r
+ www.lufa-lib.org\r
+*/\r
+\r
+/*\r
+ Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+ Permission to use, copy, modify, distribute, and sell this\r
+ software and its documentation for any purpose is hereby granted\r
+ without fee, provided that the above copyright notice appear in\r
+ all copies and that both that the copyright notice and this\r
+ permission notice and warranty disclaimer appear in supporting\r
+ documentation, and that the name of the author not be used in\r
+ advertising or publicity pertaining to distribution of the\r
+ software without specific, written prior permission.\r
+\r
+ The author disclaim all warranties with regard to this\r
+ software, including all implied warranties of merchantability\r
+ and fitness. In no event shall the author be liable for any\r
+ special, indirect or consequential damages or any damages\r
+ whatsoever resulting from loss of use, data or profits, whether\r
+ in an action of contract, negligence or other tortious action,\r
+ arising out of or in connection with the use or performance of\r
+ this software.\r
+*/\r
+\r
+/** \file\r
+ *\r
+ * Main source file for the AudioOutputHost demo. This file contains the main tasks of\r
+ * the demo and is responsible for the initial application hardware configuration.\r
+ */\r
+\r
+#include "AudioOutputHost.h"\r
+\r
+/** Main program entry point. This routine configures the hardware required by the application, then\r
+ * enters a loop to run the application tasks in sequence.\r
+ */\r
+int main(void)\r
+{\r
+ SetupHardware();\r
+\r
+ puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));\r
+\r
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
+ sei();\r
+\r
+ for (;;)\r
+ {\r
+ Audio_Task();\r
+ USB_USBTask();\r
+ }\r
+}\r
+\r
+/** Configures the board hardware and chip peripherals for the demo's functionality. */\r
+void SetupHardware(void)\r
+{\r
+ /* Disable watchdog if enabled by bootloader/fuses */\r
+ MCUSR &= ~(1 << WDRF);\r
+ wdt_disable();\r
+\r
+ /* Disable clock division */\r
+ clock_prescale_set(clock_div_1);\r
+\r
+ /* Hardware Initialization */\r
+ Serial_Init(9600, false);\r
+ Buttons_Init();\r
+ LEDs_Init();\r
+ USB_Init();\r
+\r
+ /* Create a stdio stream for the serial port for stdin and stdout */\r
+ Serial_CreateStream(NULL);\r
+}\r
+\r
+/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and\r
+ * starts the library USB task to begin the enumeration and USB management process.\r
+ */\r
+void EVENT_USB_Host_DeviceAttached(void)\r
+{\r
+ puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
+}\r
+\r
+/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and\r
+ * stops the library USB task management process.\r
+ */\r
+void EVENT_USB_Host_DeviceUnattached(void)\r
+{\r
+ puts_P(PSTR(ESC_FG_GREEN "Device Unattached.\r\n" ESC_FG_WHITE));\r
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
+}\r
+\r
+/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully\r
+ * enumerated by the host and is now ready to be used by the application.\r
+ */\r
+void EVENT_USB_Host_DeviceEnumerationComplete(void)\r
+{\r
+ LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
+}\r
+\r
+/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */\r
+void EVENT_USB_Host_HostError(const uint8_t ErrorCode)\r
+{\r
+ USB_Disable();\r
+\r
+ printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"\r
+ " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);\r
+\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
+ for(;;);\r
+}\r
+\r
+/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while\r
+ * enumerating an attached USB device.\r
+ */\r
+void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,\r
+ const uint8_t SubErrorCode)\r
+{\r
+ printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"\r
+ " -- Error Code %d\r\n"\r
+ " -- Sub Error Code %d\r\n"\r
+ " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);\r
+\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
+}\r
+\r
+void Audio_Task(void)\r
+{\r
+ uint8_t ErrorCode;\r
+\r
+ switch (USB_HostState)\r
+ {\r
+ case HOST_STATE_Addressed:\r
+ puts_P(PSTR("Getting Config Data.\r\n"));\r
+\r
+ /* Get and process the configuration descriptor data */\r
+ if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)\r
+ {\r
+ if (ErrorCode == ControlError)\r
+ puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));\r
+ else\r
+ puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));\r
+\r
+ printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);\r
+\r
+ /* Indicate error status */\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
+\r
+ /* Wait until USB device disconnected */\r
+ USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
+ break;\r
+ }\r
+\r
+ /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */\r
+ if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)\r
+ {\r
+ printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"\r
+ " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);\r
+\r
+ /* Indicate error status */\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
+\r
+ /* Wait until USB device disconnected */\r
+ USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
+ break;\r
+ }\r
+ \r
+ if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,\r
+ StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)\r
+ {\r
+ printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"\r
+ " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);\r
+\r
+ /* Indicate error status */\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
+\r
+ /* Wait until USB device disconnected */\r
+ USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
+ break;\r
+ }\r
+\r
+ USB_ControlRequest = (USB_Request_Header_t)\r
+ {\r
+ .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),\r
+ .bRequest = AUDIO_REQ_SetCurrent,\r
+ .wValue = 0x0100,\r
+ .wIndex = StreamingEndpointAddress,\r
+ .wLength = sizeof(USB_Audio_SampleFreq_t),\r
+ };\r
+ \r
+ USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);\r
+\r
+ /* Select the control pipe for the request transfer */\r
+ Pipe_SelectPipe(PIPE_CONTROLPIPE);\r
+\r
+ /* Set the sample rate on the streaming interface endpoint */\r
+ if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)\r
+ {\r
+ /* Indicate error status */\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
+\r
+ /* Wait until USB device disconnected */\r
+ USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
+ break;\r
+ }\r
+ \r
+ /* Sample reload timer initialization */\r
+ TIMSK0 = (1 << OCIE0A);\r
+ OCR0A = ((F_CPU / 8 / 48000) - 1);\r
+ TCCR0A = (1 << WGM01); // CTC mode\r
+ TCCR0B = (1 << CS01); // Fcpu/8 speed \r
+ \r
+ puts_P(PSTR("Speaker Enumerated.\r\n"));\r
+\r
+ USB_HostState = HOST_STATE_Configured;\r
+ break;\r
+ case HOST_STATE_Configured:\r
+ break;\r
+ }\r
+}\r
+\r
+/** ISR to handle the reloading of the endpoint with the next sample. */\r
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)\r
+{\r
+ uint8_t PrevPipe = Pipe_GetCurrentPipe();\r
+\r
+ Pipe_SelectPipe(AUDIO_DATA_OUT_PIPE);\r
+ Pipe_Unfreeze();\r
+\r
+ /* Check if the current pipe can be written to (device ready for more data) */\r
+ if (Pipe_IsOUTReady())\r
+ {\r
+ static uint8_t SquareWaveSampleCount;\r
+ static int16_t CurrentWaveValue;\r
+ \r
+ if (SquareWaveSampleCount++ == 0xFF)\r
+ CurrentWaveValue ^= 0x8000;\r
+ \r
+ /* Only generate audio if the board button is being pressed */\r
+ int16_t Sample_16Bit = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;\r
+ \r
+ Pipe_Write_16_LE(Sample_16Bit);\r
+ Pipe_Write_16_LE(Sample_16Bit);\r
+ \r
+ if (!(Pipe_IsReadWriteAllowed()))\r
+ Pipe_ClearOUT();\r
+ }\r
+\r
+ Pipe_Freeze();\r
+ Pipe_SelectPipe(PrevPipe);\r
+}\r
projects / pub / lufa.git / blobdiff