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Interrupt Handling
6-4 INTERRUPT HANDLING
6
Interrupt handling is accomplished using the following multi-level scheme.
1
Processor level kernel-aware interrupt handler
2
Device driver interrupt handler
During initialization, the device driver registers all necessary interrupt sources with the BSP
interrupt management code. You can also accomplish this by plugging an interrupt vector
table during compile time. Once the global interrupt vector sources are configured and an
interrupt occurs, the system will call the first-level interrupt handler. The first-level interrupt
handler is responsible for performing all kernel required steps prior to calling the USB
device driver interrupt handler: USBD_DrvISR_Handler() . Depending on the platform
architecture (that is the way the kernel handles interrupts) and the USB device controller
interrupt vectors, the device driver interrupt handler implementation may follow the models
below.
6-4-1 SINGLE USB ISR VECTOR WITH ISR HANDLER
ARGUMENT
If the platform architecture allows 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 *p_arg);
ARGUMENTS
p_arg
Pointer to USB device driver structure that must be typecast to a pointer to
USBD_DRV .
81
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