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-rw-r--r--Demos/Device/LowLevel/AudioInput/AudioInput.c23
-rw-r--r--Demos/Device/LowLevel/AudioInput/AudioInput.h1
-rw-r--r--Demos/Device/LowLevel/AudioOutput/AudioOutput.c87
-rw-r--r--Demos/Device/LowLevel/AudioOutput/AudioOutput.h1
4 files changed, 47 insertions, 65 deletions
diff --git a/Demos/Device/LowLevel/AudioInput/AudioInput.c b/Demos/Device/LowLevel/AudioInput/AudioInput.c
index 8e2d97471..9257806ed 100644
--- a/Demos/Device/LowLevel/AudioInput/AudioInput.c
+++ b/Demos/Device/LowLevel/AudioInput/AudioInput.c
@@ -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);
}
diff --git a/Demos/Device/LowLevel/AudioInput/AudioInput.h b/Demos/Device/LowLevel/AudioInput/AudioInput.h
index dfad137d7..7ba233721 100644
--- a/Demos/Device/LowLevel/AudioInput/AudioInput.h
+++ b/Demos/Device/LowLevel/AudioInput/AudioInput.h
@@ -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);
diff --git a/Demos/Device/LowLevel/AudioOutput/AudioOutput.c b/Demos/Device/LowLevel/AudioOutput/AudioOutput.c
index e33eb401e..cea44e25d 100644
--- a/Demos/Device/LowLevel/AudioOutput/AudioOutput.c
+++ b/Demos/Device/LowLevel/AudioOutput/AudioOutput.c
@@ -51,7 +51,6 @@ int main(void)
for (;;)
{
- USB_Audio_Task();
USB_USBTask();
}
}
@@ -80,27 +79,28 @@ void EVENT_USB_Device_Connect(void)
LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
/* Sample reload timer initialization */
- OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
- TCCR0A = (1 << WGM01); // CTC mode
- TCCR0B = (1 << CS01); // Fcpu/8 speed
+ TIMSK0 = (1 << OCIE0A);
+ OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
+ TCCR0A = (1 << WGM01); // CTC mode
+ TCCR0B = (1 << CS01); // Fcpu/8 speed
-#if defined(AUDIO_OUT_MONO)
+ #if defined(AUDIO_OUT_MONO)
/* Set speaker as output */
- DDRC |= (1 << 6);
-#elif defined(AUDIO_OUT_STEREO)
+ DDRC |= (1 << 6);
+ #elif defined(AUDIO_OUT_STEREO)
/* Set speakers as outputs */
- DDRC |= ((1 << 6) | (1 << 5));
-#elif defined(AUDIO_OUT_PORTC)
+ DDRC |= ((1 << 6) | (1 << 5));
+ #elif defined(AUDIO_OUT_PORTC)
/* Set PORTC as outputs */
- DDRC |= 0xFF;
-#endif
+ DDRC |= 0xFF;
+ #endif
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
/* PWM speaker timer initialization */
- TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)
- | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP
- TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, F_CPU speed
-#endif
+ TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)
+ | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP
+ TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, F_CPU speed
+ #endif
}
/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
@@ -110,20 +110,20 @@ void EVENT_USB_Device_Disconnect(void)
{
/* Stop the timers */
TCCR0B = 0;
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
TCCR3B = 0;
-#endif
+ #endif
-#if defined(AUDIO_OUT_MONO)
+ #if defined(AUDIO_OUT_MONO)
/* Set speaker as input to reduce current draw */
- DDRC &= ~(1 << 6);
-#elif defined(AUDIO_OUT_STEREO)
+ DDRC &= ~(1 << 6);
+ #elif defined(AUDIO_OUT_STEREO)
/* Set speakers as inputs to reduce current draw */
- DDRC &= ~((1 << 6) | (1 << 5));
-#elif defined(AUDIO_OUT_PORTC)
+ DDRC &= ~((1 << 6) | (1 << 5));
+ #elif defined(AUDIO_OUT_PORTC)
/* Set PORTC low */
- PORTC = 0x00;
-#endif
+ PORTC = 0x00;
+ #endif
/* Indicate streaming audio interface not selected */
StreamingAudioInterfaceSelected = false;
@@ -171,34 +171,23 @@ 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);
+ int8_t LeftSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8);
+ int8_t RightSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8);
/* Mix the two channels together to produce a mono, 8-bit sample */
- int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
+ int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
/* Check to see if the bank is now empty */
if (!(Endpoint_IsReadWriteAllowed()))
@@ -207,17 +196,17 @@ void USB_Audio_Task(void)
Endpoint_ClearOUT();
}
-#if defined(AUDIO_OUT_MONO)
+ #if defined(AUDIO_OUT_MONO)
/* Load the sample into the PWM timer channel */
OCR3A = (MixedSample_8Bit ^ (1 << 7));
-#elif defined(AUDIO_OUT_STEREO)
+ #elif defined(AUDIO_OUT_STEREO)
/* Load the dual 8-bit samples into the PWM timer channels */
OCR3A = (LeftSample_8Bit ^ (1 << 7));
OCR3B = (RightSample_8Bit ^ (1 << 7));
-#elif defined(AUDIO_OUT_PORTC)
+ #elif defined(AUDIO_OUT_PORTC)
/* Load the 8-bit mixed sample into PORTC */
PORTC = MixedSample_8Bit;
-#endif
+ #endif
uint8_t LEDMask = LEDS_NO_LEDS;
@@ -233,5 +222,7 @@ void USB_Audio_Task(void)
LEDs_SetAllLEDs(LEDMask);
}
+
+ Endpoint_SelectEndpoint(PrevEndpoint);
}
diff --git a/Demos/Device/LowLevel/AudioOutput/AudioOutput.h b/Demos/Device/LowLevel/AudioOutput/AudioOutput.h
index 7e224f23c..46540db0e 100644
--- a/Demos/Device/LowLevel/AudioOutput/AudioOutput.h
+++ b/Demos/Device/LowLevel/AudioOutput/AudioOutput.h
@@ -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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 04:56:35 +0000