/** ISR to handle the reloading of the endpoint with the next sample. */
ISR(TIMER0_COMPA_vect, ISR_BLOCK)
{
uint8_t PrevPipe = Pipe_GetCurrentPipe();
Pipe_SelectPipe(AUDIO_DATA_OUT_PIPE);
Pipe_Unfreeze();
/* Check if the current pipe can be written to (device ready for more data) */
if (Pipe_IsOUTReady())
{
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
/* Audio sample is ADC value scaled to fit the entire range */
AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
#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
Pipe_Write_16_LE(AudioSample);
Pipe_Write_16_LE(AudioSample);
if (!(Pipe_IsReadWriteAllowed()))
Pipe_ClearOUT();
}
Pipe_Freeze();
Pipe_SelectPipe(PrevPipe);
}
uint8_t USB_Host_SendControlRequest(void* const BufferPtr)
{
uint8_t* DataStream = (uint8_t*)BufferPtr;
bool BusSuspended = USB_Host_IsBusSuspended();
uint8_t ReturnStatus = HOST_SENDCONTROL_Successful;
uint16_t DataLen = USB_ControlRequest.wLength;
USB_Host_ResumeBus();
if ((ReturnStatus = USB_Host_WaitMS(1)) != HOST_WAITERROR_Successful)
goto End_Of_Control_Send;
Pipe_SetPipeToken(PIPE_TOKEN_SETUP);
Pipe_ClearError();
Pipe_Unfreeze();
Pipe_Write_8(USB_ControlRequest.bmRequestType);
Pipe_Write_8(USB_ControlRequest.bRequest);
Pipe_Write_16_LE(USB_ControlRequest.wValue);
Pipe_Write_16_LE(USB_ControlRequest.wIndex);
Pipe_Write_16_LE(USB_ControlRequest.wLength);
Pipe_ClearSETUP();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_SetupSent)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
Pipe_Freeze();
if ((ReturnStatus = USB_Host_WaitMS(1)) != HOST_WAITERROR_Successful)
goto End_Of_Control_Send;
if ((USB_ControlRequest.bmRequestType & CONTROL_REQTYPE_DIRECTION) == REQDIR_DEVICETOHOST)
{
Pipe_SetPipeToken(PIPE_TOKEN_IN);
if (DataStream != NULL)
{
while (DataLen)
{
Pipe_Unfreeze();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_InReceived)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
if (!(Pipe_BytesInPipe()))
DataLen = 0;
while (Pipe_BytesInPipe() && DataLen)
{
*(DataStream++) = Pipe_Read_8();
DataLen--;
}
Pipe_Freeze();
Pipe_ClearIN();
}
}
Pipe_SetPipeToken(PIPE_TOKEN_OUT);
Pipe_Unfreeze();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
Pipe_ClearOUT();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
}
else
{
if (DataStream != NULL)
{
Pipe_SetPipeToken(PIPE_TOKEN_OUT);
Pipe_Unfreeze();
while (DataLen)
{
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
while (DataLen && (Pipe_BytesInPipe() < USB_Host_ControlPipeSize))
{
Pipe_Write_8(*(DataStream++));
DataLen--;
}
Pipe_ClearOUT();
}
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
Pipe_Freeze();
}
Pipe_SetPipeToken(PIPE_TOKEN_IN);
Pipe_Unfreeze();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_InReceived)) != HOST_SENDCONTROL_Successful)
goto End_Of_Control_Send;
Pipe_ClearIN();
}
End_Of_Control_Send:
Pipe_Freeze();
if (BusSuspended)
USB_Host_SuspendBus();
Pipe_ResetPipe(PIPE_CONTROLPIPE);
return ReturnStatus;
}
static uint8_t USB_Host_SendControlRequest_PRV(void* const BufferPtr)
{
uint8_t* DataStream = (uint8_t*)BufferPtr;
uint8_t ReturnStatus = HOST_SENDCONTROL_Successful;
uint16_t DataLen = USB_ControlRequest.wLength;
USB_Host_ResumeBus();
if ((ReturnStatus = USB_Host_WaitMS(1)) != HOST_WAITERROR_Successful)
return ReturnStatus;
Pipe_SetPipeToken(PIPE_TOKEN_SETUP);
Pipe_ClearError();
Pipe_Unfreeze();
#if defined(ARCH_BIG_ENDIAN)
Pipe_Write_8(USB_ControlRequest.bmRequestType);
Pipe_Write_8(USB_ControlRequest.bRequest);
Pipe_Write_16_LE(USB_ControlRequest.wValue);
Pipe_Write_16_LE(USB_ControlRequest.wIndex);
Pipe_Write_16_LE(USB_ControlRequest.wLength);
#else
uint8_t* HeaderStream = (uint8_t*)&USB_ControlRequest;
for (uint8_t HeaderByte = 0; HeaderByte < sizeof(USB_Request_Header_t); HeaderByte++)
Pipe_Write_8(*(HeaderStream++));
#endif
Pipe_ClearSETUP();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_SetupSent)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
Pipe_Freeze();
if ((ReturnStatus = USB_Host_WaitMS(1)) != HOST_WAITERROR_Successful)
return ReturnStatus;
if ((USB_ControlRequest.bmRequestType & CONTROL_REQTYPE_DIRECTION) == REQDIR_DEVICETOHOST)
{
Pipe_SetPipeToken(PIPE_TOKEN_IN);
if (DataStream != NULL)
{
while (DataLen)
{
Pipe_Unfreeze();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_InReceived)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
if (!(Pipe_BytesInPipe()))
DataLen = 0;
while (Pipe_BytesInPipe() && DataLen)
{
*(DataStream++) = Pipe_Read_8();
DataLen--;
}
Pipe_Freeze();
Pipe_ClearIN();
}
}
Pipe_SetPipeToken(PIPE_TOKEN_OUT);
Pipe_Unfreeze();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
Pipe_ClearOUT();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
}
else
{
if (DataStream != NULL)
{
Pipe_SetPipeToken(PIPE_TOKEN_OUT);
Pipe_Unfreeze();
while (DataLen)
{
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
while (DataLen && (Pipe_BytesInPipe() < USB_Host_ControlPipeSize))
{
Pipe_Write_8(*(DataStream++));
DataLen--;
}
Pipe_ClearOUT();
}
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_OutReady)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
Pipe_Freeze();
}
Pipe_SetPipeToken(PIPE_TOKEN_IN);
Pipe_Unfreeze();
if ((ReturnStatus = USB_Host_WaitForIOS(USB_HOST_WAITFOR_InReceived)) != HOST_SENDCONTROL_Successful)
return ReturnStatus;
Pipe_ClearIN();
}
return ReturnStatus;
}
