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| intc Xilinx SDK Drivers API Documentation

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intc Documentation

The Xilinx interrupt controller driver component. This component supports the Xilinx interrupt controller.

The interrupt controller driver uses the idea of priority for the various handlers. Priority is an integer within the range of 0 and 31 inclusive with 0 being the highest priority interrupt source.

The Xilinx interrupt controller supports the following features:

- specific individual interrupt enabling/disabling
- specific individual interrupt acknowledging
- attaching specific callback function to handle interrupt source
- master enable/disable
- single callback per interrupt or all pending interrupts handled for each interrupt of the processor

The acknowledgement of the interrupt within the interrupt controller is selectable, either prior to the device's handler being called or after the handler is called. This is necessary to support interrupt signal inputs which are either edge or level signals. Edge driven interrupt signals require that the interrupt is acknowledged prior to the interrupt being serviced in order to prevent the loss of interrupts which are occurring extremely close together. A level driven interrupt input signal requires the interrupt to acknowledged after servicing the interrupt to ensure that the interrupt only generates a single interrupt condition.

Details about connecting the interrupt handler of the driver are contained in the source file specific to interrupt processing, xintc_intr.c.

This driver is intended to be RTOS and processor independent. It works with physical addresses only. Any needs for dynamic memory management, threads or thread mutual exclusion, virtual memory, or cache control must be satisfied by the layer above this driver.

Interrupt Vector Tables

The interrupt vector table for each interrupt controller device is declared statically in xintc_g.c within the configuration data for each instance. The device ID of the interrupt controller device is used by the driver as a direct index into the configuration data table - to retrieve the vector table for an instance of the interrupt controller. The user should populate the vector table with handlers and callbacks at run-time using the XIntc_Connect() and XIntc_Disconnect() functions.

Each vector table entry corresponds to a device that can generate an interrupt. Each entry contains an interrupt handler function and an argument to be passed to the handler when an interrupt occurs. The tools default this argument to the base address of the interrupting device. Note that the device driver interrupt handlers given in this file do not take a base address as an argument, but instead take a pointer to the driver instance. This means that although the table is created statically, the user must still use XIntc_Connect() when the interrupt handler takes an argument other than the base address. This is only to say that the existence of the static vector tables should not mislead the user into thinking they no longer need to register/connect interrupt handlers with this driver.

    MODIFICATION HISTORY:

    Ver   Who  Date     Changes

    1.00a ecm  08/16/01 First release
    1.00a rpm  01/09/02 Removed the AckLocation argument from XIntc_Connect().
                        This information is now internal in xintc_g.c.
    1.00b jhl  02/13/02 Repartitioned the driver for smaller files
    1.00b jhl  04/24/02 Made LookupConfig function global and relocated config
                        data type
    1.00c rpm  10/17/03 New release. Support the static vector table created
                        in the xintc_g.c configuration table. Moved vector
                        table and options out of instance structure and into
                        the configuration table.
    1.10c mta  03/21/07 Updated to new coding style
    1.11a sv   11/21/07 Updated driver to support access through a DCR bridge
    2.00a ktn  10/20/09 Updated to use HAL Processor APIs and _m is removed from
                  all the macro names/definitions.
    2.01a sdm  04/27/10 Updated the tcl so that the definitions are generated in
                  the xparameters.h to know whether the optional registers
                  SIE, CIE and IVR are enabled in the HW - Refer CR 555392.
                  This driver doesnot make use of these definitions and does
                  not use the optional registers.
    2.03a hvm  05/24/11 Updated the tcl to generate vector Ids for external
                  interrupts. CR565336
    2.04a bss  01/13/12 Added XIntc_ConnectFastHandler API for Fast Interrupt
                  and XIntc_SetNormalIntrMode for setting to normal
                  interrupt mode.
    2.04a asa  03/19/12 Changed the XIntc_Config struct. The order of entries
                  declared in the structure now matches with the
                  XIntc_ConfigTable generated by the driver tcl.
    2.05a bss  08/16/12 Updated to support relocatable vectors in Microblaze,
                  added IntVectorAddr to XIntc_Config for this.
                  Added XIntc_RegisterFastHandler API to register fast
                  interrupt handlers using base address.
    2.06a bss  01/28/13 To support Cascade mode:
                          Added XIN_INTC_NOCASCADE,XIN_INTC_PRIMARY,
                  XIN_INTC_SECONDARY,XIN_INTC_LAST and
                  XIN_CONTROLLER_MAX_INTRS  macros
                  Added NumberofIntrs and IntcType fields in XIntc_Config
                  structure.
                  Modified XIntc_Initialize,XIntc_Start,XIntc_Connect
                  XIntc_Disconnect,XIntc_Enable,XIntc_Disable,
                  XIntc_Acknowledge,XIntc_ConnectFastHandler and
                  XIntc_SetNormalIntrMode APIs.Added XIntc_InitializeSlaves
                  API in xintc.c
                          Modified XIntc_DeviceInterruptHandler,
                          XIntc_SetIntrSvcOption,XIntc_RegisterHandler and
                  XIntc_RegisterFastHandler APIs.Added XIntc_CascadeHandler
                  API in xintc_l.c.
                  Modified XIntc_SetOptions API in xintc_options.c.
                  Modified XIntc_SimulateIntr API in xintc_selftest.c.
                  Modified driver tcl:
                    to check for Cascade mode and generate XPAR_INTC_TYPE
                    for each controller.
                    Generate XPAR_INTC_MAX_NUM_INTR_INPUTS by adding all
                    interrupt sources of all Controllers in Cascade mode.
    2.07a bss  10/18/13 To support Nested interrupts:
                  Modified XIntc_DeviceInterruptHandler API.
                  Added XIN_ILR_OFFSET macro in xintc_l.h.
                  Modified driver tcl to generate HAS_ILR parameter in
                  xparameters.h
    3.0   bss  01/28/13 Modified xintc.c to initialize IVAR register with
                  XPAR_MICROBLAZE_BASE_VECTORS + 0x10 to fix
                  CR#765931.
                  Modified driver tcl to generate XPAR_AXI_INTC_0_TYPE
                  correctly(CR#764865).
    3.10  mus   04/10/19 Updated intc_update_source_array proc to
                          calculate total_source_intrs, based on the width of
                  interrupt port/pins.

    NoteFor Cascade mode, Interrupt IDs are generated in xparameters.h
            as shown below:
    Master/Primary INTC

            |      |-0      Secondary INTC
            |      |-.         ______
            |      |-.        |      |-32        Last INTC
            |      |-.        |      |-.          ______
            |______|<-31---—|      |-.         |      |-64
                              |      |-.         |      |-.
                              |______|<-63----—|      |-.
                                                       |      |-.
                                                       |______|-95

            All driver functions has to be called using DeviceId/
            InstancePtr/BaseAddress of Primary/Master Controller and
            Interrupts IDs generated in xparameters.h only.
            Driver functions takes care of Slave Controllers based on
            Interrupt ID passed. User must not use Interrupt source/ID
            31 of Primary and Secondary controllers to call driver
            functions.

            For nested interrupts, XIntc_DeviceInterruptHandler saves
            microblaze r14 register on entry and restores on exit. This is
            required since compiler does not support nesting. It enables
            Microblaze interrupts after blocking further interrupts from
            the current interrupt number and interrupts below current
            interrupt priority by writing to Interrupt Level Register of
            INTC on entry. On exit, it disables microblaze interrupts and
            restores ILR register default value(0xFFFFFFFF)back. It is
            recommended to increase STACK_SIZE in linker script for nested
            interrupts.
    3.0     adk    12/10/13  Updated as per the New Tcl API's
    3.0       adk    17/02/14  Fixed the CR:771287 Changes are made in the intc
                               driver tcl.
    3.1     adk    8/4/14    Fixed the CR:783248 Changes are made in
                       the test-app tcl
    3.2     bss    4/8/14    Fixed driver tcl to handle external interrupt pins
                       correctly (CR#799609).
    3.3     adk    11/3/14   added generation of C_HAS_ILR parameter to
                       xparameters.h.Changes are made in the driver tcl file
                       (CR#828046).
    3.5   sk   11/10/15 Used UINTPTR instead of u32 for Baseaddress CR# 867425.
    3.6   ms   01/23/17 Added xil_printf statement in main function for all
                        examples to ensure that "Successfully ran" and "Failed"
                        strings are available in all examples. This is a fix
                        for CR-965028.
          ms   03/17/17 Added readme.txt file in examples folder for doxygen
                        generation.
    3.7   ms   04/18/17 Modified tcl file to add suffix U for macro definitions
                        of intc in xparameters.h
    3.9   adk  19/12/18 If design contains unconnected interrupt pins
                  return proper error message(CR#1018878).