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Add new Audio Class Driver Host demos.

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Fix errors in the new Audio Host mode Class Driver, which would have prevented data from being sent or received properly by the device.

Add microphone/square wave generation compile time switch to the Low Level AudioOutput Host demo.
This commit is contained in:
Dean Camera
2011-06-09 04:08:03 +00:00
parent 0bf5064aec
commit 1f1d0710f3
16 changed files with 5306 additions and 23 deletions
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Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c
+23 -8
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@@ -68,6 +68,8 @@ void SetupHardware(void)
/* Hardware Initialization */
Serial_Init(9600, false);
Buttons_Init();
ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
LEDs_Init();
USB_Init();
@@ -234,17 +236,30 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
/* Check if the current pipe can be written to (device ready for more data) */
if (Pipe_IsOUTReady())
{
static uint8_t SquareWaveSampleCount;
static int16_t CurrentWaveValue;
int16_t AudioSample;
#if defined(USE_TEST_TONE)
static uint8_t SquareWaveSampleCount;
static int16_t CurrentWaveValue;
if (SquareWaveSampleCount++ == 0xFF)
CurrentWaveValue ^= 0x8000;
/* 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 */
int16_t Sample_16Bit = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
/* Only generate audio if the board button is being pressed */
AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
#else
/* Audio sample is ADC value scaled to fit the entire range */
AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
#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
Pipe_Write_16_LE(Sample_16Bit);
Pipe_Write_16_LE(Sample_16Bit);
Pipe_Write_16_LE(AudioSample);
Pipe_Write_16_LE(AudioSample);
if (!(Pipe_IsReadWriteAllowed()))
Pipe_ClearOUT();