\r
/** \file\r
*\r
- * Main source file for the Audio Input demo. This file contains the main tasks of the demo and\r
- * is responsible for the initial application hardware configuration.\r
+ * Main source file for the AudioInput demo. This file contains the main tasks of\r
+ * the demo and is responsible for the initial application hardware configuration.\r
*/\r
\r
#include "AudioInput.h"\r
\r
-/* Scheduler Task List */\r
-TASK_LIST\r
-{\r
- { .Task = USB_USBTask , .TaskStatus = TASK_STOP },\r
- { .Task = USB_Audio_Task , .TaskStatus = TASK_STOP },\r
-};\r
+/** LUFA Audio Class driver interface configuration and state information. This structure is\r
+ * passed to all Audio Class driver functions, so that multiple instances of the same class\r
+ * within a device can be differentiated from one another.\r
+ */\r
+USB_ClassInfo_Audio_t Microphone_Audio_Interface =\r
+ {\r
+ .StreamingInterfaceNumber = 1,\r
\r
+ .DataINEndpointNumber = AUDIO_STREAM_EPNUM,\r
+ .DataINEndpointSize = AUDIO_STREAM_EPSIZE,\r
+ };\r
\r
-/** Main program entry point. This routine configures the hardware required by the application, then\r
- * starts the scheduler to run the application tasks.\r
+/** Main program entry point. This routine contains the overall program flow, including initial\r
+ * setup of all components and the main program loop.\r
*/\r
int main(void)\r
{\r
+ SetupHardware();\r
+\r
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
+ \r
+ for (;;)\r
+ {\r
+ if (Microphone_Audio_Interface.InterfaceEnabled)\r
+ ProcessNextSample();\r
+\r
+ USB_Audio_USBTask(&Microphone_Audio_Interface);\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
/* Hardware Initialization */\r
LEDs_Init();\r
+ USB_Init();\r
ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);\r
ADC_SetupChannel(MIC_IN_ADC_CHANNEL);\r
\r
/* Start the ADC conversion in free running mode */\r
ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_CHANNEL);\r
- \r
- /* Indicate USB not ready */\r
- UpdateStatus(Status_USBNotReady);\r
- \r
- /* Initialize Scheduler so that it can be used */\r
- Scheduler_Init();\r
-\r
- /* Initialize USB Subsystem */\r
- USB_Init();\r
-\r
- /* Scheduling - routine never returns, so put this last in the main function */\r
- Scheduler_Start();\r
}\r
\r
-/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and\r
- * configures the sample update and PWM timers.\r
+/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio\r
+ * interface, each time the sample reload timer period elapses to give a constant sample rate.\r
*/\r
-EVENT_HANDLER(USB_Connect)\r
+void ProcessNextSample(void)\r
{\r
- /* Start USB management task */\r
- Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);\r
+ if ((TIFR0 & (1 << OCF0A)) && USB_Audio_IsReadyForNextSample(&Microphone_Audio_Interface))\r
+ {\r
+ TIFR0 |= (1 << OCF0A);\r
+\r
+ /* Audio sample is ADC value scaled to fit the entire range */\r
+ int16_t AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());\r
+ \r
+#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)\r
+ /* Microphone is biased to half rail voltage, subtract the bias from the sample value */\r
+ AudioSample -= (SAMPLE_MAX_RANGE / 2));\r
+#endif\r
+\r
+ USB_Audio_WriteSample16(AudioSample);\r
+ }\r
+}\r
\r
- /* Indicate USB enumerating */\r
- UpdateStatus(Status_USBEnumerating);\r
+/** Event handler for the library USB Connection event. */\r
+void EVENT_USB_Connect(void)\r
+{\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
\r
/* Sample reload timer initialization */\r
OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;\r
TCCR0B = (1 << CS00); // Fcpu speed\r
}\r
\r
-/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via\r
- * the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.\r
- */\r
-EVENT_HANDLER(USB_Disconnect)\r
+/** Event handler for the library USB Disconnection event. */\r
+void EVENT_USB_Disconnect(void)\r
{\r
/* Stop the sample reload timer */\r
TCCR0B = 0;\r
\r
- /* Stop running audio and USB management tasks */\r
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);\r
- Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);\r
-\r
- /* Indicate USB not ready */\r
- UpdateStatus(Status_USBNotReady);\r
-}\r
-\r
-/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration\r
- * of the USB device after enumeration - the device endpoints are configured.\r
- */\r
-EVENT_HANDLER(USB_ConfigurationChanged)\r
-{\r
- /* Setup audio stream endpoint */\r
- Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,\r
- ENDPOINT_DIR_IN, AUDIO_STREAM_EPSIZE,\r
- ENDPOINT_BANK_DOUBLE);\r
-\r
- /* Indicate USB connected and ready */\r
- UpdateStatus(Status_USBReady);\r
-}\r
-\r
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific\r
- * control requests that are not handled internally by the USB library (including the Audio class-specific\r
- * requests) so that they can be handled appropriately for the application.\r
- */\r
-EVENT_HANDLER(USB_UnhandledControlPacket)\r
-{\r
- /* Process General and Audio specific control requests */\r
- switch (bRequest)\r
- {\r
- case REQ_SetInterface:\r
- /* Set Interface is not handled by the library, as its function is application-specific */\r
- if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))\r
- {\r
- uint16_t wValue = Endpoint_Read_Word_LE();\r
- \r
- Endpoint_ClearControlSETUP();\r
- \r
- /* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */\r
- if (wValue)\r
- {\r
- /* Start audio task */\r
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_RUN);\r
- }\r
- else\r
- {\r
- /* Stop audio task */\r
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP); \r
- }\r
- \r
- /* Acknowledge status stage */\r
- while (!(Endpoint_IsINReady()));\r
- Endpoint_ClearControlIN();\r
- }\r
-\r
- break;\r
- }\r
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
}\r
\r
-/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to\r
- * log to a serial port, or anything else that is suitable for status updates.\r
- *\r
- * \param CurrentStatus Current status of the system, from the AudioInput_StatusCodes_t enum\r
- */\r
-void UpdateStatus(uint8_t CurrentStatus)\r
+/** Event handler for the library USB Configuration Changed event. */\r
+void EVENT_USB_ConfigurationChanged(void)\r
{\r
- uint8_t LEDMask = LEDS_NO_LEDS;\r
+ LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
\r
- /* Set the LED mask to the appropriate LED mask based on the given status code */\r
- switch (CurrentStatus)\r
- {\r
- case Status_USBNotReady:\r
- LEDMask = (LEDS_LED1);\r
- break;\r
- case Status_USBEnumerating:\r
- LEDMask = (LEDS_LED1 | LEDS_LED2);\r
- break;\r
- case Status_USBReady:\r
- LEDMask = (LEDS_LED2 | LEDS_LED4);\r
- break;\r
- }\r
- \r
- /* Set the board LEDs to the new LED mask */\r
- LEDs_SetAllLEDs(LEDMask);\r
+ if (!(USB_Audio_ConfigureEndpoints(&Microphone_Audio_Interface)))\r
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
}\r
\r
-/** Task to manage the Audio interface, reading in ADC samples from the microphone, and them to the host. */\r
-TASK(USB_Audio_Task)\r
+/** Event handler for the library USB Unhandled Control Packet event. */\r
+void EVENT_USB_UnhandledControlPacket(void)\r
{\r
- /* Select the audio stream endpoint */\r
- Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);\r
- \r
- /* Check if the current endpoint can be written to and that the next sample should be stored */\r
- if (Endpoint_IsINReady() && (TIFR0 & (1 << OCF0A)))\r
- {\r
- /* Clear the sample reload timer */\r
- TIFR0 |= (1 << OCF0A);\r
-\r
- /* Audio sample is ADC value scaled to fit the entire range */\r
- int16_t AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());\r
- \r
-#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)\r
- /* Microphone is biased to half rail voltage, subtract the bias from the sample value */\r
- AudioSample -= (SAMPLE_MAX_RANGE / 2));\r
-#endif\r
-\r
- /* Write the sample to the buffer */\r
- Endpoint_Write_Word_LE(AudioSample);\r
-\r
- /* Check to see if the bank is now full */\r
- if (!(Endpoint_IsReadWriteAllowed()))\r
- {\r
- /* Send the full packet to the host */\r
- Endpoint_ClearIN();\r
- }\r
- }\r
+ USB_Audio_ProcessControlPacket(&Microphone_Audio_Interface);\r
}\r
projects / pub / USBasp.git / blobdiff