diff options
Diffstat (limited to 'Demos/Device/AudioOutput/AudioOutput.c')
| -rw-r--r-- | Demos/Device/AudioOutput/AudioOutput.c | 277 |
1 files changed, 91 insertions, 186 deletions
diff --git a/Demos/Device/AudioOutput/AudioOutput.c b/Demos/Device/AudioOutput/AudioOutput.c index 40e376b52..0f193567a 100644 --- a/Demos/Device/AudioOutput/AudioOutput.c +++ b/Demos/Device/AudioOutput/AudioOutput.c @@ -28,27 +28,33 @@ this software.
*/
-/** \file
- *
- * Main source file for the Audio Output demo. This file contains the main tasks of the demo and
- * is responsible for the initial application hardware configuration.
- */
-
#include "AudioOutput.h"
-/* Scheduler Task List */
-TASK_LIST
-{
- { .Task = USB_USBTask , .TaskStatus = TASK_STOP },
- { .Task = USB_Audio_Task , .TaskStatus = TASK_STOP },
-};
+USB_ClassInfo_Audio_t Speaker_Audio_Interface =
+ {
+ .InterfaceNumber = 0,
+ .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,
+ .DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,
+ };
-/** Main program entry point. This routine configures the hardware required by the application, then
- * starts the scheduler to run the application tasks.
- */
int main(void)
{
+ SetupHardware();
+
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+ for (;;)
+ {
+ if (Speaker_Audio_Interface.InterfaceEnabled)
+ ProcessNextSample();
+
+ USB_USBTask();
+ }
+}
+
+void SetupHardware(void)
+{
/* Disable watchdog if enabled by bootloader/fuses */
MCUSR &= ~(1 << WDRF);
wdt_disable();
@@ -58,186 +64,19 @@ int main(void) /* Hardware Initialization */
LEDs_Init();
-
- /* Indicate USB not ready */
- UpdateStatus(Status_USBNotReady);
-
- /* Initialize Scheduler so that it can be used */
- Scheduler_Init();
-
- /* Initialize USB Subsystem */
USB_Init();
-
- /* Scheduling - routine never returns, so put this last in the main function */
- Scheduler_Start();
-}
-
-/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and
- * configures the sample update and PWM timers.
- */
-void EVENT_USB_Connect(void)
-{
- /* Start USB management task */
- Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
-
- /* Indicate USB enumerating */
- UpdateStatus(Status_USBEnumerating);
-
- /* Sample reload timer initialization */
- OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;
- TCCR0A = (1 << WGM01); // CTC mode
- TCCR0B = (1 << CS00); // Fcpu speed
-
-#if defined(AUDIO_OUT_MONO)
- /* Set speaker as output */
- DDRC |= (1 << 6);
-#elif defined(AUDIO_OUT_STEREO)
- /* Set speakers as outputs */
- DDRC |= ((1 << 6) | (1 << 5));
-#elif defined(AUDIO_OUT_PORTC)
- /* Set PORTC as outputs */
- DDRC |= 0xFF;
-#endif
-
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
- /* PWM speaker timer initialization */
- TCCRxA = ((1 << WGMx0) | (1 << COMxA1) | (1 << COMxA0)
- | (1 << COMxB1) | (1 << COMxB0)); // Set on match, clear on TOP
- TCCRxB = ((1 << WGMx2) | (1 << CSx0)); // Fast 8-Bit PWM, Fcpu speed
-#endif
}
-/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
- * the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.
- */
-void EVENT_USB_Disconnect(void)
-{
- /* Stop the timers */
- TCCR0B = 0;
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
- TCCRxB = 0;
-#endif
-
-#if defined(AUDIO_OUT_MONO)
- /* Set speaker as input to reduce current draw */
- DDRC &= ~(1 << 6);
-#elif defined(AUDIO_OUT_STEREO)
- /* Set speakers as inputs to reduce current draw */
- DDRC &= ~((1 << 6) | (1 << 5));
-#elif defined(AUDIO_OUT_PORTC)
- /* Set PORTC low */
- PORTC = 0x00;
-#endif
-
- /* Stop running audio and USB management tasks */
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);
- Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
-
- /* Indicate USB not ready */
- UpdateStatus(Status_USBNotReady);
-}
-
-/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
- * of the USB device after enumeration - the device endpoints are configured.
- */
-void EVENT_USB_ConfigurationChanged(void)
-{
- /* Setup audio stream endpoint */
- Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,
- ENDPOINT_DIR_OUT, AUDIO_STREAM_EPSIZE,
- ENDPOINT_BANK_DOUBLE);
-
- /* Indicate USB connected and ready */
- UpdateStatus(Status_USBReady);
-}
-
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
- * control requests that are not handled internally by the USB library (including the Audio class-specific
- * requests) so that they can be handled appropriately for the application.
- */
-void EVENT_USB_UnhandledControlPacket(void)
+void ProcessNextSample(void)
{
- /* Process General and Audio specific control requests */
- switch (USB_ControlRequest.bRequest)
- {
- case REQ_SetInterface:
- /* Set Interface is not handled by the library, as its function is application-specific */
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
- {
- Endpoint_ClearSETUP();
-
- /* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
- if (USB_ControlRequest.wValue)
- {
- /* Start audio task */
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_RUN);
- }
- else
- {
- /* Stop audio task */
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);
- }
-
- /* Acknowledge status stage */
- while (!(Endpoint_IsINReady()));
- Endpoint_ClearIN();
- }
-
- break;
- }
-}
-
-/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
- * log to a serial port, or anything else that is suitable for status updates.
- *
- * \param CurrentStatus Current status of the system, from the AudioOutput_StatusCodes_t enum
- */
-void UpdateStatus(uint8_t CurrentStatus)
-{
- uint8_t LEDMask = LEDS_NO_LEDS;
-
- /* Set the LED mask to the appropriate LED mask based on the given status code */
- switch (CurrentStatus)
- {
- case Status_USBNotReady:
- LEDMask = (LEDS_LED1);
- break;
- case Status_USBEnumerating:
- LEDMask = (LEDS_LED1 | LEDS_LED2);
- break;
- case Status_USBReady:
- LEDMask = (LEDS_LED2 | LEDS_LED4);
- break;
- }
-
- /* Set the board LEDs to the new LED mask */
- LEDs_SetAllLEDs(LEDMask);
-}
-
-/** Task to manage the Audio interface, reading in audio samples from the host, and outputting them to the speakers/LEDs as
- * desired.
- */
-TASK(USB_Audio_Task)
-{
- /* Select the audio stream endpoint */
- Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);
-
- /* Check if the current endpoint can be read from (contains a packet) and that the next sample should be read */
- if (Endpoint_IsOUTReceived() && (TIFR0 & (1 << OCF0A)))
+ if ((TIFR0 & (1 << OCF0A)) && USB_Audio_IsSampleReceived(&Speaker_Audio_Interface))
{
/* Clear the sample reload timer */
TIFR0 |= (1 << OCF0A);
/* Retrieve the signed 16-bit left and right audio samples */
- int16_t LeftSample_16Bit = (int16_t)Endpoint_Read_Word_LE();
- int16_t RightSample_16Bit = (int16_t)Endpoint_Read_Word_LE();
-
- /* Check to see if the bank is now empty */
- if (!(Endpoint_IsReadWriteAllowed()))
- {
- /* Acknowledge the packet, clear the bank ready for the next packet */
- Endpoint_ClearOUT();
- }
+ int16_t LeftSample_16Bit = (int16_t)USB_Audio_ReadSample16();
+ int16_t RightSample_16Bit = (int16_t)USB_Audio_ReadSample16();
/* Massage signed 16-bit left and right audio samples into signed 8-bit */
int8_t LeftSample_8Bit = (LeftSample_16Bit >> 8);
@@ -289,3 +128,69 @@ TASK(USB_Audio_Task) #endif
}
}
+
+void EVENT_USB_Connect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+
+ /* Sample reload timer initialization */
+ OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;
+ TCCR0A = (1 << WGM01); // CTC mode
+ TCCR0B = (1 << CS00); // Fcpu speed
+
+#if defined(AUDIO_OUT_MONO)
+ /* Set speaker as output */
+ DDRC |= (1 << 6);
+#elif defined(AUDIO_OUT_STEREO)
+ /* Set speakers as outputs */
+ DDRC |= ((1 << 6) | (1 << 5));
+#elif defined(AUDIO_OUT_PORTC)
+ /* Set PORTC as outputs */
+ DDRC |= 0xFF;
+#endif
+
+#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ /* PWM speaker timer initialization */
+ TCCRxA = ((1 << WGMx0) | (1 << COMxA1) | (1 << COMxA0)
+ | (1 << COMxB1) | (1 << COMxB0)); // Set on match, clear on TOP
+ TCCRxB = ((1 << WGMx2) | (1 << CSx0)); // Fast 8-Bit PWM, Fcpu speed
+#endif
+}
+
+/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
+ * the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.
+ */
+void EVENT_USB_Disconnect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+ /* Stop the timers */
+ TCCR0B = 0;
+#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ TCCRxB = 0;
+#endif
+
+#if defined(AUDIO_OUT_MONO)
+ /* Set speaker as input to reduce current draw */
+ DDRC &= ~(1 << 6);
+#elif defined(AUDIO_OUT_STEREO)
+ /* Set speakers as inputs to reduce current draw */
+ DDRC &= ~((1 << 6) | (1 << 5));
+#elif defined(AUDIO_OUT_PORTC)
+ /* Set PORTC low */
+ PORTC = 0x00;
+#endif
+}
+
+void EVENT_USB_ConfigurationChanged(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_READY);
+
+ if (!(USB_Audio_ConfigureEndpoints(&Speaker_Audio_Interface)))
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+}
+
+void EVENT_USB_UnhandledControlPacket(void)
+{
+ USB_Audio_ProcessControlPacket(&Speaker_Audio_Interface);
+}
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