Texas Instruments OMAP5912 Reference Manual page 1440

Multimedia processor device overview and architecture

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USB Device Controller

Setup Interrupt Handler

Universal Serial Bus (USB)

A separate interrupt flag exists for setup transactions so that the MPU cannot

miss a setup transaction, even if it occurs during the data or status phase of

another transfer (case of an aborted transfer). The setup parsing function

captures the control transfer request information for use in determining which

USB bus activity is needed and in controlling how the MPU must generate or

respond to the control transfer. This information includes the following:

bmRequestType

The setup interrupt handler shown in Figure 16 is responsible for processing

setup transactions occurring on endpoint 0. It calls the routine that parses the

control transfer request information, shown in Figure 17 to set flags that the

rest of the ISR code can use to control proper response to control transfers.

Two flags are set by the setup interrupt handler, to be used during endpoint 0

interrupt handlers:

Control read flag

Control write flag

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