/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
* enumerated by the host and is now ready to be used by the application.
*/
void EVENT_USB_Host_DeviceEnumerationComplete(void)
{
LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
uint16_t ConfigDescriptorSize;
uint8_t ConfigDescriptorData[512];
if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
{
puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
return;
}
if (Audio_Host_ConfigurePipes(&Speaker_Audio_Interface,
ConfigDescriptorSize, ConfigDescriptorData) != AUDIO_ENUMERROR_NoError)
{
puts_P(PSTR("Attached Device Not a Valid Audio Output Device.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
return;
}
if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Error Setting Device Configuration.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
return;
}
if (Audio_Host_StartStopStreaming(&Speaker_Audio_Interface, true) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Error Enabling Audio Stream.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_Host_SetDeviceConfiguration(0);
return;
}
USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
if (Audio_Host_GetSetEndpointProperty(&Speaker_Audio_Interface, Speaker_Audio_Interface.Config.DataOUTPipeNumber,
AUDIO_REQ_SetCurrent, AUDIO_EPCONTROL_SamplingFreq,
sizeof(SampleRate), &SampleRate) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Error Setting Audio Sampling Frequency.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_Host_SetDeviceConfiguration(0);
return;
}
/* Sample reload timer initialization */
TIMSK0 = (1 << OCIE0A);
OCR0A = ((F_CPU / 8 / 48000) - 1);
TCCR0A = (1 << WGM01); // CTC mode
TCCR0B = (1 << CS01); // Fcpu/8 speed
puts_P(PSTR("Audio Device Enumerated.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_READY);
}
.Type = DTYPE_CSInterface
},
.Subtype = AUDIO_DSUBTYPE_CSInterface_FormatType,
.FormatType = 0x01,
.Channels = 0x01,
.SubFrameSize = 0x02,
.BitResolution = 16,
.TotalDiscreteSampleRates = (sizeof(ConfigurationDescriptor.Audio_AudioFormatSampleRates) / sizeof(USB_Audio_SampleFreq_t)),
},
.Audio_AudioFormatSampleRates =
{
AUDIO_SAMPLE_FREQ(8000),
AUDIO_SAMPLE_FREQ(11025),
AUDIO_SAMPLE_FREQ(22050),
AUDIO_SAMPLE_FREQ(44100),
AUDIO_SAMPLE_FREQ(48000),
},
.Audio_StreamEndpoint =
{
.Endpoint =
{
.Header = {.Size = sizeof(USB_Audio_Descriptor_StreamEndpoint_Std_t), .Type = DTYPE_Endpoint},
.EndpointAddress = (ENDPOINT_DESCRIPTOR_DIR_IN | AUDIO_STREAM_EPNUM),
.Attributes = (EP_TYPE_ISOCHRONOUS | ENDPOINT_ATTR_SYNC | ENDPOINT_USAGE_DATA),
.EndpointSize = AUDIO_STREAM_EPSIZE,
/** Main program entry point. This routine configures the hardware required by the application, then
* enters a loop to run the application tasks in sequence.
*/
int main(void)
{
SetupHardware();
puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));
LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
sei();
for (;;)
{
switch (USB_HostState)
{
case HOST_STATE_Addressed:
LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
uint16_t ConfigDescriptorSize;
uint8_t ConfigDescriptorData[512];
if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
{
puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
if (Audio_Host_ConfigurePipes(&Speaker_Audio_Interface,
ConfigDescriptorSize, ConfigDescriptorData) != AUDIO_ENUMERROR_NoError)
{
puts_P(PSTR("Attached Device Not a Valid Audio Output Device.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Error Setting Device Configuration.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
if (Audio_Host_StartStopStreaming(&Speaker_Audio_Interface, true) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Error Enabling Audio Stream.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
if (Audio_Host_GetSetEndpointProperty(&Speaker_Audio_Interface, Speaker_Audio_Interface.Config.DataOUTPipeNumber,
AUDIO_REQ_SetCurrent, AUDIO_EPCONTROL_SamplingFreq,
sizeof(SampleRate), &SampleRate) != HOST_SENDCONTROL_Successful)
{
puts_P(PSTR("Error Setting Audio Sampling Frequency.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
/* Sample reload timer initialization */
TIMSK0 = (1 << OCIE0A);
OCR0A = ((F_CPU / 8 / 48000) - 1);
TCCR0A = (1 << WGM01); // CTC mode
TCCR0B = (1 << CS01); // Fcpu/8 speed
puts_P(PSTR("Audio Device Enumerated.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_READY);
USB_HostState = HOST_STATE_Configured;
break;
case HOST_STATE_Configured:
/* Do nothing - audio stream is handled by the timer interrupt routine */
break;
}
Audio_Host_USBTask(&Speaker_Audio_Interface);
USB_USBTask();
}
}
.AudioFormat = 0x0001
},
.Audio_AudioFormat =
{
.Header = {.Size = sizeof(USB_Audio_Descriptor_Format_t), .Type = DTYPE_CSInterface},
.Subtype = AUDIO_DSUBTYPE_CSInterface_FormatType,
.FormatType = 0x01,
.Channels = 0x01,
.SubFrameSize = 0x02,
.BitResolution = 16,
.SampleFrequencyType = AUDIO_TOTAL_SAMPLE_RATES,
.SampleFrequencies = {AUDIO_SAMPLE_FREQ(AUDIO_SAMPLE_FREQUENCY)}
},
.Audio_StreamEndpoint =
{
.Endpoint =
{
.Header = {.Size = sizeof(USB_Audio_Descriptor_StreamEndpoint_Std_t), .Type = DTYPE_Endpoint},
.EndpointAddress = (ENDPOINT_DESCRIPTOR_DIR_IN | AUDIO_STREAM_EPNUM),
.Attributes = (EP_TYPE_ISOCHRONOUS | ENDPOINT_ATTR_SYNC | ENDPOINT_USAGE_DATA),
.EndpointSize = AUDIO_STREAM_EPSIZE,
.PollingIntervalMS = 0x01
},
.Refresh = 0,
/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
* enumerated by the host and is now ready to be used by the application.
*/
void EVENT_USB_Host_DeviceEnumerationComplete(void)
{
puts_P(PSTR("Getting Config Data.\r\n"));
uint8_t ErrorCode;
/* Get and process the configuration descriptor data */
if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
{
if (ErrorCode == ControlError)
puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
else
puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
return;
}
/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
{
printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
return;
}
if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
{
printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"
" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_Host_SetDeviceConfiguration(0);
return;
}
USB_ControlRequest = (USB_Request_Header_t)
{
.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),
.bRequest = AUDIO_REQ_SetCurrent,
.wValue = (AUDIO_EPCONTROL_SamplingFreq << 8),
.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 */
Pipe_SelectPipe(PIPE_CONTROLPIPE);
/* Set the sample rate on the streaming interface endpoint */
if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
{
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
USB_Host_SetDeviceConfiguration(0);
return;
}
/* Sample reload timer initialization */
TIMSK0 = (1 << OCIE0A);
OCR0A = ((F_CPU / 8 / 48000) - 1);
TCCR0A = (1 << WGM01); // CTC mode
TCCR0B = (1 << CS01); // Fcpu/8 speed
puts_P(PSTR("Speaker Enumerated.\r\n"));
LEDs_SetAllLEDs(LEDMASK_USB_READY);
}
/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
{
USB_Disable();
printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
" -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
for(;;);
}
0x01, /* bTerminalLink */ 0x01, /* bDelay */ 0x01, /* wFormatTag AUDIO_FORMAT_PCM 0x0001*/ 0x00, /* 07 byte*/ /* USB Speaker Audio Type III Format Interface Descriptor */ 0x0B, /* bLength */ AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ AUDIO_FORMAT_TYPE_III, /* bFormatType */ 0x02, /* bNrChannels */ 0x02, /* bSubFrameSize : 2 Bytes per frame (16bits) */ 16, /* bBitResolution (16-bits per sample) */ 0x01, /* bSamFreqType only one frequency supported */ AUDIO_SAMPLE_FREQ(USBD_AUDIO_FREQ), /* Audio sampling frequency coded on 3 bytes */ /* 11 byte*/ /* Endpoint 1 - Standard Descriptor */ AUDIO_STANDARD_ENDPOINT_DESC_SIZE, /* bLength */ USB_DESC_TYPE_ENDPOINT, /* bDescriptorType */ AUDIO_OUT_EP, /* bEndpointAddress 1 out endpoint*/ USBD_EP_TYPE_ISOC, /* bmAttributes */ AUDIO_PACKET_SZE(USBD_AUDIO_FREQ), /* wMaxPacketSize in Bytes (Freq(Samples)*2(Stereo)*2(HalfWord)) */ 0x01, /* bInterval */ 0x00, /* bRefresh */ 0x00, /* bSynchAddress */ /* 09 byte*/ /* Endpoint - Audio Streaming Descriptor*/ AUDIO_STREAMING_ENDPOINT_DESC_SIZE, /* bLength */
