ahoneybun/qmk_firmware
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add new Audio Class Driver Host demos.

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

31
Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c
View file

@ -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();