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Chapter 6
6
6-4-2 SINGLE USB ISR VECTOR
If the platform architecture does not allow parameters to be passed to ISR handlers and the
USB device controller has a single interrupt vector for the USB device, the first-level
interrupt handler may be defined as:
PROTOTYPE
void USBD_BSP_<controller>_IntHandler (void);
ARGUMENTS
None.
NOTES / WARNINGS
In this configuration, the pointer to the USB device driver structure must be stored globally
in the driver. Since the pointer to the USB device structure is never modified, the BSP
initialization function, USBD_BSP_Init() , can save its address for later use.
6-4-3 MULTIPLE USB ISR VECTORS WITH ISR HANDLER
ARGUMENTS
If the platform architecture allows parameters to be passed to ISR handlers and the USB
device controller has multiple interrupt vectors for the USB device (e.g., USB events, DMA
transfers), the first-level interrupt handler may need to be split into multiple sub-handlers.
Each sub-handler would be responsible for managing the status reported to the different
vectors. For example, the first-level interrupt handlers for a USB device controller that
redirects USB events to one interrupt vector and the status of DMA transfers to a second
interrupt vector may be defined as:
PROTOTYPE
void USBD_BSP_<controller>_EventIntHandler (void *p_arg);
void USBD_BSP_<controller>_DMAIntHandler (void *p_arg);
ARGUMENTS
p_arg
Pointer to USB device driver structure that must be typecast to a pointer to
USBD_DRV .
82
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