/** 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();
CmdState = CMD_STOP;
LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
GlobalInterruptEnable();
for (;;)
{
Read_Joystick_Status();
DiscardNextReport();
USB_USBTask();
}
}
/** Writes a report to the attached device.
*
* \param[in] ReportOUTData Buffer containing the report to send to the device
* \param[in] ReportLength Length of the report to send
*/
void WriteNextReport(uint8_t* ReportOUTData, uint16_t ReportLength)
{
/* Select and unfreeze HID data OUT pipe */
Pipe_SelectPipe(HID_DATA_OUT_PIPE);
/* Not all HID devices have an OUT endpoint (some require OUT reports to be sent over the
* control endpoint instead) - check to see if the OUT endpoint has been initialized */
if (Pipe_IsConfigured())
{
Pipe_Unfreeze();
/* Ensure pipe is ready to be written to before continuing */
if (!(Pipe_IsOUTReady()))
{
/* Refreeze the data OUT pipe */
Pipe_Freeze();
return;
}
/* Write out HID report data */
Pipe_Write_Stream_LE(ReportOUTData, ReportLength);
/* Clear the OUT endpoint, send last data packet */
Pipe_ClearOUT();
/* Refreeze the data OUT pipe */
Pipe_Freeze();
}
else
{
/* Class specific request to send a HID report to the device */
USB_ControlRequest = (USB_Request_Header_t)
{
.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
.bRequest = 0x09,
.wValue = 0x02,
.wIndex = 0x01,
.wLength = ReportLength,
};
/* Select the control pipe for the request transfer */
Pipe_SelectPipe(PIPE_CONTROLPIPE);
/* Send the request to the device */
USB_Host_SendControlRequest(ReportOUTData);
}
}
/** Task to set the configuration of the attached device after it has been enumerated, and to read and process
* HID reports from the device and to send reports if desired.
*/
void HID_Host_Task(void)
{
uint8_t ErrorCode;
/* Switch to determine what user-application handled host state the host state machine is in */
switch (USB_HostState)
{
case HOST_STATE_Addressed:
/* Get and process the configuration descriptor data */
if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
{
/* Indicate error status */
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
/* Wait until USB device disconnected */
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
{
/* Indicate error status */
LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
/* Wait until USB device disconnected */
USB_HostState = HOST_STATE_WaitForDeviceRemoval;
break;
}
USB_HostState = HOST_STATE_Configured;
break;
case HOST_STATE_Configured:
DiscardNextReport();
break;
}
}
