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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.

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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2
LUFA.pnproj
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File diff suppressed because one or more lines are too long

1
LUFA/DoxygenPages/ChangeLog.txt
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@ -34,6 +34,7 @@
* having to reset the Mass Storage interface * having to reset the Mass Storage interface
* - USB_CONFIG_ATTR_BUSPOWERED constant renamed to USB_CONFIG_ATTR_RESERVED, as this was misnamed (thanks to NXP Semiconductors) * - USB_CONFIG_ATTR_BUSPOWERED constant renamed to USB_CONFIG_ATTR_RESERVED, as this was misnamed (thanks to NXP Semiconductors)
* - Reordered board name definition indexes so that a mispelled BOARD compile option will default to BOARD_USER rather than BOARD_USBKEY * - Reordered board name definition indexes so that a mispelled BOARD compile option will default to BOARD_USER rather than BOARD_USBKEY
* - Altered the HID class driver to only try to construct at maximum one packet per USB frame, to reduce CPU usage
* - Library Applications: * - Library Applications:
* - Altered the Mass Storage Host LowLevel demo so that SCSI data STALLs from the attached device can be recovered from automatically without * - Altered the Mass Storage Host LowLevel demo so that SCSI data STALLs from the attached device can be recovered from automatically without
* having to reset the Mass Storage interface * having to reset the Mass Storage interface

5
LUFA/Drivers/USB/Class/Device/HIDClassDevice.c
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@ -156,6 +156,9 @@ void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
if (USB_DeviceState != DEVICE_STATE_Configured) if (USB_DeviceState != DEVICE_STATE_Configured)
return; return;
if (HIDInterfaceInfo->State.PrevFrameNum == USB_Device_GetFrameNumber())
return;
Endpoint_SelectEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber); Endpoint_SelectEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber);
if (Endpoint_IsReadWriteAllowed()) if (Endpoint_IsReadWriteAllowed())
@ -190,6 +193,8 @@ void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
Endpoint_ClearIN(); Endpoint_ClearIN();
} }
HIDInterfaceInfo->State.PrevFrameNum = USB_Device_GetFrameNumber();
} }
} }

1
LUFA/Drivers/USB/Class/Device/HIDClassDevice.h
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@ -113,6 +113,7 @@
struct struct
{ {
bool UsingReportProtocol; /**< Indicates if the HID interface is set to Boot or Report protocol mode. */ 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 IdleCount; /**< Report idle period, in milliseconds, set by the host. */
uint16_t IdleMSRemaining; /**< Total number of milliseconds remaining before the idle period elapsed - this 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. */ * should be decremented by the user application if non-zero each millisecond. */