USBCBSuspend Function

Microchip USB Device Library

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USB Device Library Help

void USBCBSuspend();

Description

Call back that is invoked when a USB suspend is detected.

Example power saving code. Insert appropriate code here for the desired application behavior. If the microcontroller will be put to sleep, a process similar to that shown below may be used:

Example Psuedo Code:

Copy Code

ConfigureIOPinsForLowPower();
SaveStateOfAllInterruptEnableBits();
DisableAllInterruptEnableBits();

//should enable at least USBActivityIF as a wake source
EnableOnlyTheInterruptsWhichWillBeUsedToWakeTheMicro();

Sleep();

//Preferrably, this should be done in the
//  USBCBWakeFromSuspend() function instead.
RestoreStateOfAllPreviouslySavedInterruptEnableBits();

//Preferrably, this should be done in the
//  USBCBWakeFromSuspend() function instead.
RestoreIOPinsToNormal();

IMPORTANT NOTE: Do not clear the USBActivityIF (ACTVIF) bit here. This bit is cleared inside the usb_device.c file. Clearing USBActivityIF here will cause things to not work as intended.

Preconditions

None

Paramters: None

Side Effects

None

Remark: None

MCHPFSUSB Device Library > Stack > Public API Members > Functions and Macros > USBCBSuspend Function

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