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Changed AudioInput and AudioOutput demos to reload the next sample via an interrupt rather than polling the sample timer.

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This commit is contained in:
Dean Camera 2010-10-26 06:52:09 +00:00
parent 55538dcef3
commit 08de757811
10 changed files with 88 additions and 112 deletions
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23
Demos/Device/LowLevel/AudioInput/AudioInput.c
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@ -51,7 +51,6 @@ int main(void)
for (;;)
{
USB_Audio_Task();
USB_USBTask();
}
}
@ -86,6 +85,7 @@ void EVENT_USB_Device_Connect(void)
LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
/* Sample reload timer initialization */
TIMSK0 = (1 << OCIE0A);
OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
TCCR0A = (1 << WGM01); // CTC mode
TCCR0B = (1 << CS01); // Fcpu/8 speed
@ -145,26 +145,17 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
}
}
/** Task to manage the Audio interface, reading in ADC samples from the microphone, and them to the host. */
void USB_Audio_Task(void)
/** ISR to handle the reloading of the data endpoint with the next sample. */
ISR(TIMER0_COMPA_vect, ISR_BLOCK)
{
/* Device must be connected and configured for the task to run */
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
/* Check to see if the streaming interface is selected, if not the host is not receiving audio */
if (!(StreamingAudioInterfaceSelected))
return;
uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
/* Select the audio stream endpoint */
Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);
/* Check if the current endpoint can be written to and that the next sample should be stored */
if (Endpoint_IsINReady() && (TIFR0 & (1 << OCF0A)))
/* Check if the current endpoint can be written to and that the audio interface is enabled */
if (Endpoint_IsINReady() && StreamingAudioInterfaceSelected)
{
/* Clear the sample reload timer */
TIFR0 |= (1 << OCF0A);
int16_t AudioSample;
#if defined(USE_TEST_TONE)
@ -197,5 +188,7 @@ void USB_Audio_Task(void)
Endpoint_ClearIN();
}
}
Endpoint_SelectEndpoint(PrevEndpoint);
}