diff options
Diffstat (limited to 'Demos/Device/LowLevel/AudioInput/AudioInput.c')
-rw-r--r-- | Demos/Device/LowLevel/AudioInput/AudioInput.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/Demos/Device/LowLevel/AudioInput/AudioInput.c b/Demos/Device/LowLevel/AudioInput/AudioInput.c index 52fbb8bd6..ff165b25c 100644 --- a/Demos/Device/LowLevel/AudioInput/AudioInput.c +++ b/Demos/Device/LowLevel/AudioInput/AudioInput.c @@ -163,16 +163,16 @@ void EVENT_USB_Device_ControlRequest(void) /* Extract out the relevant request information to get the target Endpoint address and control being set */ uint8_t EndpointAddress = (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 ((EndpointAddress == (ENDPOINT_DIR_IN | AUDIO_STREAM_EPNUM)) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq)) { uint8_t SampleRate[3]; - + Endpoint_ClearSETUP(); Endpoint_Read_Control_Stream_LE(SampleRate, sizeof(SampleRate)); Endpoint_ClearIN(); - + /* 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]); @@ -180,7 +180,7 @@ void EVENT_USB_Device_ControlRequest(void) OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1); } } - + break; case AUDIO_REQ_GetCurrent: if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT)) @@ -188,20 +188,20 @@ void EVENT_USB_Device_ControlRequest(void) /* Extract out the relevant request information to get the target Endpoint address and control being retrieved */ uint8_t EndpointAddress = (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 ((EndpointAddress == (ENDPOINT_DIR_IN | 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(); + Endpoint_ClearOUT(); } } @@ -225,11 +225,11 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) #if defined(USE_TEST_TONE) static uint8_t SquareWaveSampleCount; static int16_t CurrentWaveValue; - + /* In test tone mode, generate a square wave at 1/256 of the sample rate */ if (SquareWaveSampleCount++ == 0xFF) CurrentWaveValue ^= 0x8000; - + /* Only generate audio if the board button is being pressed */ AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0; #else @@ -239,7 +239,7 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) #if defined(MICROPHONE_BIASED_TO_HALF_RAIL) /* Microphone is biased to half rail voltage, subtract the bias from the sample value */ AudioSample -= (SAMPLE_MAX_RANGE / 2); - #endif + #endif #endif /* Write the sample to the buffer */ |