Make both LowLevel and ClassDriver AudioOutput demos always output to board LEDs, regardless of output mode (removed AUDIO_OUT_LEDS compile time option from the demo). This allows for positive feedback to the user of audio activity regardless of output mode.

Demos/Device/ClassDriver/AudioOutput/AudioOutput.c

@@ -103,10 +103,11 @@ void ProcessNextSample(void)
 		int8_t  LeftSample_8Bit   = (LeftSample_16Bit  >> 8);
 		int8_t  RightSample_8Bit  = (RightSample_16Bit >> 8);
 
-#if !defined(AUDIO_OUT_STEREO)
 		/* 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);
-#endif
+
+		/* Get absolute value of mixed sample value */
+		uint8_t MixedSample_8Bit_Abs = abs(MixedSample_8Bit);
 
 #if defined(AUDIO_OUT_MONO)
 		/* Load the sample into the PWM timer channel */
@@ -118,26 +119,23 @@ void ProcessNextSample(void)
 #elif defined(AUDIO_OUT_PORTC)
 		/* Load the 8-bit mixed sample into PORTC */
 		PORTC = MixedSample_8Bit;
-#else
-		uint8_t LEDMask = LEDS_NO_LEDS;
+#endif
 
-		/* Make mixed sample value positive (absolute) */
-		MixedSample_8Bit = abs(MixedSample_8Bit);
+		uint8_t LEDMask = LEDS_NO_LEDS;
 
-		if (MixedSample_8Bit > 2)
+		if (MixedSample_8Bit_Abs > 2)
 		  LEDMask |= LEDS_LED1;
 		  
-		if (MixedSample_8Bit > 4)
+		if (MixedSample_8Bit_Abs > 4)
 		  LEDMask |= LEDS_LED2;
 		  
-		if (MixedSample_8Bit > 8)
+		if (MixedSample_8Bit_Abs > 8)
 		  LEDMask |= LEDS_LED3;
 
-		if (MixedSample_8Bit > 16)
+		if (MixedSample_8Bit_Abs > 16)
 		  LEDMask |= LEDS_LED4;
 
 		LEDs_SetAllLEDs(LEDMask);
-#endif
 	}
 }
 

Demos/Device/ClassDriver/AudioOutput/AudioOutput.txt

@@ -53,11 +53,11 @@
  *  required).
  *  
  *  On start-up the system will automatically enumerate and function
- *  as a USB speaker. Incoming audio will output in 8-bit PWM onto
- *  the timer output (timer 3 for the AT90USBXXX6/7 USB AVRs, timer 1 for
- *  the AT90USBXXX2 controller AVRs) compare channel A for AUDIO_OUT_MONO
- *  mode, on channels A and B for AUDIO_OUT_STEREO and on the board LEDs
- *  for AUDIO_OUT_LEDS mode. Decouple audio outputs with a capacitor and
+ *  as a USB speaker. Outgoing audio will output in 8-bit PWM onto
+ *  the timer 3 output compare channel A for AUDIO_OUT_MONO mode, on
+ *  timer 3 channels A and B for AUDIO_OUT_STEREO and on PORTC as a signed
+ *  mono sample for AUDIO_OUT_PORTC. Audio output will also be indicated on
+ *  the board LEDs in all modes. Decouple audio outputs with a capacitor and
  *  attach to a speaker to hear the audio.
  *  
  *  Under Windows, if a driver request dialogue pops up, select the option
@@ -84,11 +84,6 @@
  *    <td>When defined, this outputs the audio samples in mono to the timer output pin of the microcontroller.</td>
  *   </tr>
  *   <tr>
- *    <td>AUDIO_OUT_LEDS</td>
- *    <td>Makefile CDEFS</td>
- *    <td>When defined, this outputs the audio samples in stereo to the board LEDs.</td>
- *   </tr>
- *   <tr>
  *    <td>AUDIO_OUT_PORTC</td>
  *    <td>Makefile CDEFS</td>
  *    <td>When defined, this outputs the audio samples in mono to port C of the microcontroller, for connection to an

Demos/Device/LowLevel/AudioOutput/AudioOutput.c

@@ -210,10 +210,11 @@ void USB_Audio_Task(void)
 		int8_t  LeftSample_8Bit   = (LeftSample_16Bit  >> 8);
 		int8_t  RightSample_8Bit  = (RightSample_16Bit >> 8);
 			
-#if !defined(AUDIO_OUT_STEREO)
 		/* 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);
-#endif
+
+		/* Get absolute value of mixed sample value */
+		uint8_t MixedSample_8Bit_Abs = abs(MixedSample_8Bit);
 
 #if defined(AUDIO_OUT_MONO)
 		/* Load the sample into the PWM timer channel */
@@ -225,25 +226,22 @@ void USB_Audio_Task(void)
 #elif defined(AUDIO_OUT_PORTC)
 		/* Load the 8-bit mixed sample into PORTC */
 		PORTC = MixedSample_8Bit;
-#else
-		uint8_t LEDMask = LEDS_NO_LEDS;
+#endif
 
-		/* Make mixed sample value positive (absolute) */
-		MixedSample_8Bit = abs(MixedSample_8Bit);
+		uint8_t LEDMask = LEDS_NO_LEDS;
 
-		if (MixedSample_8Bit > 2)
+		if (MixedSample_8Bit_Abs > 2)
 		  LEDMask |= LEDS_LED1;
 		  
-		if (MixedSample_8Bit > 4)
+		if (MixedSample_8Bit_Abs > 4)
 		  LEDMask |= LEDS_LED2;
 		  
-		if (MixedSample_8Bit > 8)
+		if (MixedSample_8Bit_Abs > 8)
 		  LEDMask |= LEDS_LED3;
 
-		if (MixedSample_8Bit > 16)
+		if (MixedSample_8Bit_Abs > 16)
 		  LEDMask |= LEDS_LED4;
 		  
 		LEDs_SetAllLEDs(LEDMask);
-#endif
 	}
 }

Demos/Device/LowLevel/AudioOutput/AudioOutput.txt

@@ -53,11 +53,11 @@
  *  required).
  *  
  *  On start-up the system will automatically enumerate and function
- *  as a USB speaker. Incoming audio will output in 8-bit PWM onto
- *  the timer output (timer 3 for the AT90USBXXX6/7 USB AVRs, timer 1 for
- *  the AT90USBXXX2 controller AVRs) compare channel A for AUDIO_OUT_MONO
- *  mode, on channels A and B for AUDIO_OUT_STEREO and on the board LEDs
- *  for AUDIO_OUT_LEDS mode. Decouple audio outputs with a capacitor and
+ *  as a USB speaker. Outgoing audio will output in 8-bit PWM onto
+ *  the timer 3 output compare channel A for AUDIO_OUT_MONO mode, on
+ *  timer 3 channels A and B for AUDIO_OUT_STEREO and on PORTC as a signed
+ *  mono sample for AUDIO_OUT_PORTC. Audio output will also be indicated on
+ *  the board LEDs in all modes. Decouple audio outputs with a capacitor and
  *  attach to a speaker to hear the audio.
  *  
  *  Under Windows, if a driver request dialogue pops up, select the option
@@ -84,11 +84,6 @@
  *    <td>When defined, this outputs the audio samples in mono to the timer output pin of the microcontroller.</td>
  *   </tr>
  *   <tr>
- *    <td>AUDIO_OUT_LEDS</td>
- *    <td>Makefile CDEFS</td>
- *    <td>When defined, this outputs the audio samples in stereo to the board LEDs.</td>
- *   </tr>
- *   <tr>
  *    <td>AUDIO_OUT_PORTC</td>
  *    <td>Makefile CDEFS</td>
  *    <td>When defined, this outputs the audio samples in mono to port C of the microcontroller, for connection to an