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

Browse Source
pull/1469/head
Dean Camera 14 years ago
parent 55538dcef3
commit 08de757811
10 changed files with 88 additions and 112 deletions
Show Stats Download Patch File Download Diff File

18
Demos/Device/ClassDriver/AudioInput/AudioInput.c
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@ -63,8 +63,6 @@ int main(void)
for (;;)
{
ProcessNextSample();
Audio_Device_USBTask(&Microphone_Audio_Interface);
USB_USBTask();
}
@ -91,17 +89,14 @@ void SetupHardware(void)
ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_MUX_MASK);
}
/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio
* interface, each time the sample reload timer period elapses to give a constant sample rate.
*/
void ProcessNextSample(void)
/** ISR to handle the reloading of the data endpoint with the next sample. */
ISR(TIMER0_COMPA_vect, ISR_BLOCK)
{
uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
/* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */
if ((TIFR0 & (1 << OCF0A)) && Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface))
if (Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface))
{
/* Clear the sample reload timer compare flag, ready for the next interval */
TIFR0 |= (1 << OCF0A);
int16_t AudioSample;
#if defined(USE_TEST_TONE)
@ -126,6 +121,8 @@ void ProcessNextSample(void)
Audio_Device_WriteSample16(&Microphone_Audio_Interface, AudioSample);
}
Endpoint_SelectEndpoint(PrevEndpoint);
}
/** Event handler for the library USB Connection event. */
@ -134,6 +131,7 @@ 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

1
Demos/Device/ClassDriver/AudioInput/AudioInput.h
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@ -77,7 +77,6 @@
/* Function Prototypes: */
void SetupHardware(void);
void ProcessNextSample(void);
void EVENT_USB_Device_Connect(void);
void EVENT_USB_Device_Disconnect(void);

19
Demos/Device/ClassDriver/AudioOutput/AudioOutput.c
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@ -63,8 +63,6 @@ int main(void)
for (;;)
{
ProcessNextSample();
Audio_Device_USBTask(&Speaker_Audio_Interface);
USB_USBTask();
}
@ -85,17 +83,13 @@ void SetupHardware(void)
USB_Init();
}
/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio
* interface, each time the sample reload timer period elapses to give a constant sample rate.
*/
void ProcessNextSample(void)
{
/* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */
if ((TIFR0 & (1 << OCF0A)) && Audio_Device_IsSampleReceived(&Speaker_Audio_Interface))
/** ISR to handle the reloading of the PWM timer with the next sample. */
ISR(TIMER0_COMPA_vect, ISR_BLOCK)
{
/* Clear the sample reload timer compare flag, ready for the next interval */
TIFR0 |= (1 << OCF0A);
uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
if (Audio_Device_IsSampleReceived(&Speaker_Audio_Interface))
{
/* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */
int8_t LeftSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
int8_t RightSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
@ -129,6 +123,8 @@ void ProcessNextSample(void)
LEDs_SetAllLEDs(LEDMask);
}
Endpoint_SelectEndpoint(PrevEndpoint);
}
/** Event handler for the library USB Connection event. */
@ -137,6 +133,7 @@ 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

1
Demos/Device/ClassDriver/AudioOutput/AudioOutput.h
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@ -64,7 +64,6 @@
/* Function Prototypes: */
void SetupHardware(void);
void ProcessNextSample(void);
void EVENT_USB_Device_Connect(void);
void EVENT_USB_Device_Disconnect(void);

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);
}

1
Demos/Device/LowLevel/AudioInput/AudioInput.h
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@ -77,7 +77,6 @@
/* Function Prototypes: */
void SetupHardware(void);
void USB_Audio_Task(void);
void EVENT_USB_Device_Connect(void);
void EVENT_USB_Device_Disconnect(void);

25
Demos/Device/LowLevel/AudioOutput/AudioOutput.c
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@ -51,7 +51,6 @@ int main(void)
for (;;)
{
USB_Audio_Task();
USB_USBTask();
}
}
@ -80,6 +79,7 @@ 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
@ -171,28 +171,17 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
}
}
/** Task to manage the Audio interface, reading in audio samples from the host, and outputting them to the speakers/LEDs as
* desired.
*/
void USB_Audio_Task(void)
/** ISR to handle the reloading of the PWM timer 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 read from (contains a packet) and that the next sample should be read */
if (Endpoint_IsOUTReceived() && (TIFR0 & (1 << OCF0A)))
/* Check if the current endpoint can be read from (contains a packet) and the host is sending data */
if (Endpoint_IsOUTReceived() && StreamingAudioInterfaceSelected)
{
/* Clear the sample reload timer */
TIFR0 |= (1 << OCF0A);
/* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */
int8_t LeftSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8);
int8_t RightSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8);
@ -233,5 +222,7 @@ void USB_Audio_Task(void)
LEDs_SetAllLEDs(LEDMask);
}
Endpoint_SelectEndpoint(PrevEndpoint);
}

1
Demos/Device/LowLevel/AudioOutput/AudioOutput.h
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@ -63,7 +63,6 @@
/* Function Prototypes: */
void SetupHardware(void);
void USB_Audio_Task(void);
void EVENT_USB_Device_Connect(void);
void EVENT_USB_Device_Disconnect(void);

4
LUFA/Drivers/USB/Class/Host/HID.h
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@ -97,8 +97,8 @@
bool DataOUTPipeDoubleBank; /**< Indicates if the HID interface's OUT data pipe should use double banking. */
uint8_t HIDInterfaceProtocol; /**< HID interface protocol value to match against if a specific
* boot subclass protocol is required, a value from the \ref HID_BootProtocols_t
* enum.
* boot subclass protocol is required, a protocol value from the
* \ref HID_Descriptor_ClassSubclassProtocol_t enum.
*/
#if !defined(HID_HOST_BOOT_PROTOCOL_ONLY)
HID_ReportInfo_t* HIDParserData; /**< HID parser data to store the parsed HID report data, when boot protocol

1
LUFA/ManPages/ChangeLog.txt
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@ -57,6 +57,7 @@
* - Better algorithm to extract and convert the internal device serial number into a string descriptor (if present)
* - All USB class drivers are now automatically included when LUFA/Drivers/USB.h is included, and no longer need to be seperately included
* - All LowLevel demos changed to use the constants and types defined in the USB class drivers
* - Changed AudioInput and AudioOutput demos to reload the next sample via an interrupt rather than polling the sample timer
*
* <b>Fixed:</b>
* - Fixed USB_GetHIDReportItemInfo() function modifying the given report item's data when the report item does not exist

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