Only deque from the USBtoSerial's USB->USART buffer when the USART is idle.

[pub/USBasp.git] / Demos / Host / LowLevel / AudioOutputHost / AudioOutputHost.c

diff --git a/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c b/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c
index 704ddea..819c83e 100644 (file)
--- a/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c
+++ b/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2011.
+     Copyright (C) Dean Camera, 2014.
 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*
-  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -18,7 +18,7 @@
   advertising or publicity pertaining to distribution of the
   software without specific, written prior permission.
 
-  The author disclaim all warranties with regard to this
+  The author disclaims all warranties with regard to this
   software, including all implied warranties of merchantability
   and fitness.  In no event shall the author be liable for any
   special, indirect or consequential damages or any damages
@@ -46,7 +46,7 @@ int main(void)
        puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));
 
        LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
-       sei();
+       GlobalInterruptEnable();
 
        for (;;)
        {
@@ -57,23 +57,28 @@ int main(void)
 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 void SetupHardware(void)
 {
+#if (ARCH == ARCH_AVR8)
        /* Disable watchdog if enabled by bootloader/fuses */
        MCUSR &= ~(1 << WDRF);
        wdt_disable();
 
        /* Disable clock division */
        clock_prescale_set(clock_div_1);
+#endif
 
        /* Hardware Initialization */
        Serial_Init(9600, false);
        Buttons_Init();
        ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
-       ADC_SetupChannel(MIC_IN_ADC_CHANNEL);   
+       ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
        LEDs_Init();
        USB_Init();
 
        /* Create a stdio stream for the serial port for stdin and stdout */
        Serial_CreateStream(NULL);
+
+       /* Start the ADC conversion in free running mode */
+       ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL));
 }
 
 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
@@ -126,7 +131,7 @@ void EVENT_USB_Host_DeviceEnumerationComplete(void)
                LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
                return;
        }
-       
+
        if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
                                                         StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
        {
@@ -146,7 +151,7 @@ void EVENT_USB_Host_DeviceEnumerationComplete(void)
                        .wIndex        = StreamingEndpointAddress,
                        .wLength       = sizeof(USB_Audio_SampleFreq_t),
                };
-               
+
        USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 
        /* Select the control pipe for the request transfer */
@@ -155,6 +160,9 @@ void EVENT_USB_Host_DeviceEnumerationComplete(void)
        /* Set the sample rate on the streaming interface endpoint */
        if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
        {
+               printf_P(PSTR(ESC_FG_RED "Could not set requested Audio sample rate.\r\n"
+                                        " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+
                LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
                USB_Host_SetDeviceConfiguration(0);
                return;
@@ -164,8 +172,8 @@ void EVENT_USB_Host_DeviceEnumerationComplete(void)
        TIMSK0  = (1 << OCIE0A);
        OCR0A   = ((F_CPU / 8 / 48000) - 1);
        TCCR0A  = (1 << WGM01);  // CTC mode
-       TCCR0B  = (1 << CS01);   // Fcpu/8 speed        
-       
+       TCCR0B  = (1 << CS01);   // Fcpu/8 speed
+
        puts_P(PSTR("Speaker Enumerated.\r\n"));
        LEDs_SetAllLEDs(LEDMASK_USB_READY);
 }
@@ -207,16 +215,16 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
        /* Check if the current pipe can be written to (device ready for more data) */
        if (Pipe_IsOUTReady())
        {
-               int16_t AudioSample;            
-       
+               int16_t AudioSample;
+
                #if defined(USE_TEST_TONE)
                        static uint8_t SquareWaveSampleCount;
                        static int16_t CurrentWaveValue;
-                       
+
                        /* 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 */
                        AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
                #else
@@ -226,12 +234,12 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
                        #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
                #endif
-               
+
                Pipe_Write_16_LE(AudioSample);
                Pipe_Write_16_LE(AudioSample);
-               
+
                if (!(Pipe_IsReadWriteAllowed()))
                  Pipe_ClearOUT();
        }
@@ -239,3 +247,4 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
        Pipe_Freeze();
        Pipe_SelectPipe(PrevPipe);
 }
+