473 lines
15 KiB
C
Executable file
473 lines
15 KiB
C
Executable file
/******************************************************************************
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*
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* (c) Copyright 2011-2013 Xilinx, Inc. All rights reserved.
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*
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* This file contains confidential and proprietary information of Xilinx, Inc.
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* and is protected under U.S. and international copyright and other
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* intellectual property laws.
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*
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* DISCLAIMER
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* This disclaimer is not a license and does not grant any rights to the
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* materials distributed herewith. Except as otherwise provided in a valid
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* license issued to you by Xilinx, and to the maximum extent permitted by
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* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
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* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
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* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
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* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
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* and (2) Xilinx shall not be liable (whether in contract or tort, including
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* negligence, or under any other theory of liability) for any loss or damage
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* of any kind or nature related to, arising under or in connection with these
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* materials, including for any direct, or any indirect, special, incidental,
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* or consequential loss or damage (including loss of data, profits, goodwill,
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* or any type of loss or damage suffered as a result of any action brought by
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* a third party) even if such damage or loss was reasonably foreseeable or
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* Xilinx had been advised of the possibility of the same.
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*
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* CRITICAL APPLICATIONS
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* Xilinx products are not designed or intended to be fail-safe, or for use in
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* any application requiring fail-safe performance, such as life-support or
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* safety devices or systems, Class III medical devices, nuclear facilities,
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* applications related to the deployment of airbags, or any other applications
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* that could lead to death, personal injury, or severe property or
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* environmental damage (individually and collectively, "Critical
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* Applications"). Customer assumes the sole risk and liability of any use of
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* Xilinx products in Critical Applications, subject only to applicable laws
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* and regulations governing limitations on product liability.
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*
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* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
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* AT ALL TIMES.
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*
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******************************************************************************/
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/*****************************************************************************/
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/**
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* @file xtmrctr_intr_64bit_example.c
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*
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* This file contains a design example using the timer counter driver
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* (XTmCtr) and hardware device using interrupt mode with the counters configured
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* in cascasde mode for a 64 bit operation. Both the timers should enabled in
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* HW configuration for the cascade mode of operation.
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*
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* The cascade mode of operation is present in the new versions of the
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* axi_timer IP. Please check the HW Datasheet to see whether this feature
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* is present in the version of the IP that you are using.
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*
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* This example assumes that the interrupt controller is also present as a part of
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* the system.
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*
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*
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*
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* <pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -----------------------------------------------
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* 2.04a sdm 07/15/11 Created based on the xtmrctr_intr_example
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*
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*</pre>
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******************************************************************************/
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/***************************** Include Files *********************************/
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#include "xparameters.h"
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#include "xtmrctr.h"
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#include "xintc.h"
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#include "xil_exception.h"
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/************************** Constant Definitions *****************************/
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/*
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* The following constants map to the XPAR parameters created in the
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* xparameters.h file. They are only defined here such that a user can easily
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* change all the needed parameters in one place.
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*/
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#define TMRCTR_DEVICE_ID XPAR_TMRCTR_0_DEVICE_ID
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#define INTC_DEVICE_ID XPAR_INTC_0_DEVICE_ID
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#define TMRCTR_INTERRUPT_ID XPAR_INTC_0_TMRCTR_0_VEC_ID
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/*
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* The following constant determines which timer counter of the device that is
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* used for this example, there are currently 2 timer counters in a device
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* and this example uses the first one, 0, the timer numbers are 0 based
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*/
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#define TIMER_CNTR_0 0
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#define TIMER_CNTR_1 1
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/*
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* The following constants are used to set the reset value of the timer counter,
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* making this number larger reduces the amount of time this example consumes
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* because it is the value the timer counter is loaded with when it is started
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*/
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#define RESET_VALUE_CNTR_0 0xF0000000
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#define RESET_VALUE_CNTR_1 0xFFFFFF00
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/**************************** Type Definitions *******************************/
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/***************** Macros (Inline Functions) Definitions *********************/
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/************************** Function Prototypes ******************************/
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int TmrCtrCascadeIntrExample(XIntc* IntcInstancePtr,
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XTmrCtr* InstancePtr,
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u16 DeviceId,
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u16 IntrId);
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static int TmrCtrSetupIntrSystem(XIntc* IntcInstancePtr,
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XTmrCtr* InstancePtr,
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u16 DeviceId,
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u16 IntrId);
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void TimerCounterHandler(void *CallBackRef, u8 TmrCtrNumber);
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void TmrCtrDisableIntr(XIntc* IntcInstancePtr, u16 IntrId);
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/************************** Variable Definitions *****************************/
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XIntc InterruptController; /* The instance of the Interrupt Controller */
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XTmrCtr TimerCounterInst; /* The instance of the Timer Counter */
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/*
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* The following variables are shared between non-interrupt processing and
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* interrupt processing such that they must be global.
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*/
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volatile int TimerExpired;
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/*****************************************************************************/
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/**
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* This function is the main function of the Tmrctr 64 bit example using
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* Interrupts.
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*
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* @param None.
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*
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* @return
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*
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* - XST_SUCCESS to indicate success
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* - XST_FAILURE to indicate a failure.
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*
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* @note None.
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*
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******************************************************************************/
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int main(void)
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{
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int Status;
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/*
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* Run the Timer Counter Cascade mode - Interrupt example.
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*/
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Status = TmrCtrCascadeIntrExample(&InterruptController,
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&TimerCounterInst,
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TMRCTR_DEVICE_ID,
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TMRCTR_INTERRUPT_ID);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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return XST_SUCCESS;
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}
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/*****************************************************************************/
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/**
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* This function does a minimal test on the timer counter device and driver as a
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* design example. The purpose of this function is to illustrate how to use the
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* XTmrCtr driver in cascade mode of operation. It initializes a timer counter
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* and then sets it up in compare mode with auto reload such that a periodic
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* interrupt is generated.
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*
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* This function uses interrupt driven mode of the timer counter.
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*
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* @param IntcInstancePtr is a pointer to the Interrupt Controller
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* driver Instance
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* @param TmrCtrInstancePtr is a pointer to the XTmrCtr driver Instance
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* @param DeviceId is the XPAR_<TmrCtr_instance>_DEVICE_ID value from
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* xparameters.h
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* @param IntrId is XPAR_<INTC_instance>_<TmrCtr_instance>_VEC_ID
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* value from xparameters.h
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*
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* @return
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* - XST_SUCCESS if the Test is successful.
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* - XST_FAILURE if the Test is Not Successful.
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*
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* @note This function contains an infinite loop such that if interrupts
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* are not working it may never return.
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*
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*****************************************************************************/
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int TmrCtrCascadeIntrExample(XIntc *IntcInstancePtr,
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XTmrCtr *TmrCtrInstancePtr,
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u16 DeviceId,
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u16 IntrId)
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{
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int Status;
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int LastTimerExpired = 0;
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/*
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* Initialize the timer counter so that it's ready to use,
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* specify the device ID that is generated in xparameters.h
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*/
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Status = XTmrCtr_Initialize(TmrCtrInstancePtr, DeviceId);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Perform a self-test to ensure that the hardware was built
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* correctly, use the 1st timer in the device (0)
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*/
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Status = XTmrCtr_SelfTest(TmrCtrInstancePtr, TIMER_CNTR_0);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Perform a self-test to ensure that the hardware was built
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* correctly, use the 2nd timer in the device (0)
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*/
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Status = XTmrCtr_SelfTest(TmrCtrInstancePtr, TIMER_CNTR_1);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Connect the timer counter to the interrupt subsystem such that
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* interrupts can occur. This function is application specific.
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* In the cascade mode only the interrupt from Timer Zero is valid.
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*/
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Status = TmrCtrSetupIntrSystem(IntcInstancePtr,
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TmrCtrInstancePtr,
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DeviceId,
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IntrId);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Setup the handler for the timer counter that will be called from the
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* interrupt context when the timer expires, specify a pointer to the
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* timer counter driver instance as the callback reference so the handler
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* is able to access the instance data
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*/
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XTmrCtr_SetHandler(TmrCtrInstancePtr, TimerCounterHandler,
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TmrCtrInstancePtr);
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/*
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* Set a reset value for the timer counter such that it will expire
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* eariler than letting it roll over from 0, the reset value is loaded
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* into the timer counter when it is started
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*/
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XTmrCtr_SetResetValue(TmrCtrInstancePtr, TIMER_CNTR_0,
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RESET_VALUE_CNTR_0);
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XTmrCtr_SetResetValue(TmrCtrInstancePtr, TIMER_CNTR_1,
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RESET_VALUE_CNTR_1);
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/*
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* Enable the interrupt of the timer counter so interrupts will occur
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* and use auto reload mode such that the timer counter will reload
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* itself automatically and continue repeatedly, without this option
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* it would expire once only and set the Cascade mode.
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*/
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XTmrCtr_SetOptions(TmrCtrInstancePtr, TIMER_CNTR_0,
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XTC_INT_MODE_OPTION |
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XTC_AUTO_RELOAD_OPTION |
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XTC_CASCADE_MODE_OPTION);
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/*
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* Reset the timer counters such that it's incrementing by default
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*/
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XTmrCtr_Reset(TmrCtrInstancePtr, TIMER_CNTR_0);
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XTmrCtr_Reset(TmrCtrInstancePtr, TIMER_CNTR_1);
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/*
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* Start the timer counter 0 such that it's incrementing by default,
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* then wait for it to timeout a number of times.
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*/
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XTmrCtr_Start(TmrCtrInstancePtr, TIMER_CNTR_0);
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while (1) {
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/*
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* Wait for the first timer counter to expire as indicated by the
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* shared variable which the handler will increment
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*/
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while (TimerExpired == LastTimerExpired) {
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}
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LastTimerExpired = TimerExpired;
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/*
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* If it has expired a number of times, then stop the timer counter
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* and stop this example
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*/
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if (TimerExpired == 3) {
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XTmrCtr_Stop(TmrCtrInstancePtr, TIMER_CNTR_0);
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break;
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}
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}
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TmrCtrDisableIntr(IntcInstancePtr, DeviceId);
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return XST_SUCCESS;
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}
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/*****************************************************************************/
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/**
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* This function is the handler which performs processing for the timer counter.
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* It is called from an interrupt context such that the amount of processing
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* performed should be minimized. It is called when the timer counter expires
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* if interrupts are enabled.
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*
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* This handler provides an example of how to handle timer counter interrupts
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* but is application specific.
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*
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* @param CallBackRef is a pointer to the callback function
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* @param TmrCtrNumber is the number of the timer to which this
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* handler is associated with.
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*
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* @return None.
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*
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* @note None.
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*
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******************************************************************************/
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void TimerCounterHandler(void *CallBackRef, u8 TmrCtrNumber)
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{
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XTmrCtr *InstancePtr = (XTmrCtr *)CallBackRef;
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/*
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* Check if the timer counter has expired, checking is not necessary
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* since that's the reason this function is executed, this just shows
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* how the callback reference can be used as a pointer to the instance
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* of the timer counter that expired, increment a shared variable so
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* the main thread of execution can see the timer expired
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*/
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if (XTmrCtr_IsExpired(InstancePtr, TmrCtrNumber)) {
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TimerExpired++;
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if(TimerExpired == 3) {
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XTmrCtr_SetOptions(InstancePtr, TmrCtrNumber, 0);
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}
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}
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}
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/*****************************************************************************/
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/**
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* This function setups the interrupt system such that interrupts can occur
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* for the timer counter. This function is application specific since the actual
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* system may or may not have an interrupt controller. The timer counter could
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* be directly connected to a processor without an interrupt controller. The
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* user should modify this function to fit the application.
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*
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* @param IntcInstancePtr is a pointer to the Interrupt Controller
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* driver Instance.
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* @param TmrCtrInstancePtr is a pointer to the XTmrCtr driver Instance.
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* @param DeviceId is the XPAR_<TmrCtr_instance>_DEVICE_ID value from
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* xparameters.h.
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* @param IntrId is XPAR_<INTC_instance>_<TmrCtr_instance>_VEC_ID
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* value from xparameters.h.
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*
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* @return
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* - XST_SUCCESS if the Test is successful
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* - XST_FAILURE if the Test is not successful
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*
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* @note This function contains an infinite loop such that if interrupts
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* are not working it may never return.
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*
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******************************************************************************/
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static int TmrCtrSetupIntrSystem(XIntc* IntcInstancePtr,
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XTmrCtr* TmrCtrInstancePtr,
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u16 DeviceId,
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u16 IntrId)
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{
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int Status;
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/*
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* Initialize the interrupt controller driver so that
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* it's ready to use, specify the device ID that is generated in
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* xparameters.h
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*/
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Status = XIntc_Initialize(IntcInstancePtr, INTC_DEVICE_ID);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Connect a device driver handler that will be called when an interrupt
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* for the device occurs, the device driver handler performs the specific
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* interrupt processing for the device
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*/
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Status = XIntc_Connect(IntcInstancePtr, IntrId,
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(XInterruptHandler)XTmrCtr_InterruptHandler,
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(void *)TmrCtrInstancePtr);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Start the interrupt controller such that interrupts are enabled for
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* all devices that cause interrupts, specific real mode so that
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* the timer counter can cause interrupts thru the interrupt controller.
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*/
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Status = XIntc_Start(IntcInstancePtr, XIN_REAL_MODE);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Enable the interrupt for the timer counter
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*/
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XIntc_Enable(IntcInstancePtr, IntrId);
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/*
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* Initialize the exception table.
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*/
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Xil_ExceptionInit();
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/*
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* Register the interrupt controller handler with the exception table.
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*/
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Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
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(Xil_ExceptionHandler)
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XIntc_InterruptHandler,
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IntcInstancePtr);
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/*
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* Enable non-critical exceptions.
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*/
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Xil_ExceptionEnable();
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return XST_SUCCESS;
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}
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/******************************************************************************/
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/**
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*
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* This function disables the interrupts for the Timer.
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*
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* @param IntcInstancePtr is a reference to the Interrupt Controller
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* driver Instance.
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* @param IntrId is XPAR_<INTC_instance>_<Timer_instance>_VEC_ID
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* value from xparameters.h.
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*
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* @return None.
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*
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* @note None.
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*
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******************************************************************************/
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void TmrCtrDisableIntr(XIntc* IntcInstancePtr, u16 IntrId)
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{
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/*
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* Disable the interrupt for the timer counter
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*/
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XIntc_Disable(IntcInstancePtr, IntrId);
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return;
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}
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