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Altered the HID class driver to only try to construct at maximum one packet per USB frame, to reduce CPU usage.

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This commit is contained in:
Dean Camera 2012-02-09 20:30:27 +00:00
parent 385ffb6de3
commit 2180f57d17
4 changed files with 8 additions and 1 deletions
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5
LUFA/Drivers/USB/Class/Device/HIDClassDevice.c
View file

@ -156,6 +156,9 @@ void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
if (HIDInterfaceInfo->State.PrevFrameNum == USB_Device_GetFrameNumber())
return;
Endpoint_SelectEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber);
if (Endpoint_IsReadWriteAllowed())
@ -190,6 +193,8 @@ void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
Endpoint_ClearIN();
}
HIDInterfaceInfo->State.PrevFrameNum = USB_Device_GetFrameNumber();
}
}

1
LUFA/Drivers/USB/Class/Device/HIDClassDevice.h
View file

@ -113,6 +113,7 @@
struct
{
bool UsingReportProtocol; /**< Indicates if the HID interface is set to Boot or Report protocol mode. */
uint16_t PrevFrameNum; /**< Frame number of the previous HID report packet opportunity. */
uint16_t IdleCount; /**< Report idle period, in milliseconds, set by the host. */
uint16_t IdleMSRemaining; /**< Total number of milliseconds remaining before the idle period elapsed - this
* should be decremented by the user application if non-zero each millisecond. */