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Update the Low Level Audio Input and Audio Output demos to support multiple sample rates.

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Remove custom PIDs on the Class Driver Audio device demos and revert back to the original Audio PIDs, as the low level and class driver demo versions are now descriptor compatible once again.
This commit is contained in:
Dean Camera 2011-06-06 09:43:09 +00:00
parent 7dffa15c16
commit 1a25b6f5f1
12 changed files with 138 additions and 27 deletions
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56
Demos/Device/LowLevel/AudioInput/AudioInput.c
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@ -39,6 +39,9 @@
/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
static bool StreamingAudioInterfaceSelected = false;
/** Current audio sampling frequency of the streaming audio endpoint. */
static uint32_t CurrentAudioSampleFrequency = 48000;
/** Main program entry point. This routine contains the overall program flow, including initial
* setup of all components and the main program loop.
@ -87,7 +90,7 @@ void EVENT_USB_Device_Connect(void)
/* Sample reload timer initialization */
TIMSK0 = (1 << OCIE0A);
OCR0A = ((F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1);
OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
TCCR0A = (1 << WGM01); // CTC mode
TCCR0B = (1 << CS01); // Fcpu/8 speed
}
@ -152,6 +155,57 @@ void EVENT_USB_Device_ControlRequest(void)
Endpoint_ClearSETUP();
Endpoint_ClearStatusStage();
}
break;
case AUDIO_REQ_SetCurrent:
if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT))
{
/* Extract out the relevant request information to get the target Endpoint index and control being set */
uint8_t EndpointIndex = (uint8_t)USB_ControlRequest.wIndex;
uint8_t EndpointControl = (USB_ControlRequest.wValue >> 8);
/* Only handle SET CURRENT requests to the audio endpoint's sample frequency property */
if ((EndpointIndex == AUDIO_STREAM_EPNUM) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq))
{
uint8_t SampleRate[3];
Endpoint_ClearSETUP();
Endpoint_Read_Control_Stream_LE(SampleRate, sizeof(SampleRate));
Endpoint_ClearOUT();
/* Set the new sampling frequency to the value given by the host */
CurrentAudioSampleFrequency = (((uint32_t)SampleRate[2] << 16) | ((uint32_t)SampleRate[1] << 8) | (uint32_t)SampleRate[0]);
/* Adjust sample reload timer to the new frequency */
OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
}
}
break;
case AUDIO_REQ_GetCurrent:
if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT))
{
/* Extract out the relevant request information to get the target Endpoint index and control being retrieved */
uint8_t EndpointIndex = (uint8_t)USB_ControlRequest.wIndex;
uint8_t EndpointControl = (USB_ControlRequest.wValue >> 8);
/* Only handle GET CURRENT requests to the audio endpoint's sample frequency property */
if ((EndpointIndex == AUDIO_STREAM_EPNUM) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq))
{
uint8_t SampleRate[3];
/* Convert the sampling rate value into the 24-bit format the host expects for the property */
SampleRate[2] = (CurrentAudioSampleFrequency >> 16);
SampleRate[1] = (CurrentAudioSampleFrequency >> 8);
SampleRate[0] = (CurrentAudioSampleFrequency & 0xFF);
Endpoint_ClearSETUP();
Endpoint_Write_Control_Stream_LE(SampleRate, sizeof(SampleRate));
Endpoint_ClearOUT();
}
}
break;
}
}