209 lines
7.1 KiB
C
Executable file
209 lines
7.1 KiB
C
Executable file
/******************************************************************************
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*
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* (c) Copyright 2002-2010,2013 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_low_level_example.c
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*
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* This file contains a design example using the Timer Counter (XTmrCtr)
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* low level driver and hardware device in a polled mode.
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*
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* @note
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*
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* None
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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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* 1.00b jhl 02/13/02 First release
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* 1.00b sv 04/26/05 Minor changes to comply to Doxygen and coding guidelines
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* 2.00a ktn 10/30/09 Updated the example as the macros in the driver are
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* renamed by removing _m in the definition.
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* Minor changes as per coding guidelines are done.
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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 "xstatus.h"
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#include "xtmrctr_l.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_BASEADDR XPAR_TMRCTR_0_BASEADDR
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/*
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* This example only uses the 1st of the 2 timer counters contained in a
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* single timer counter hardware device
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*/
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#define TIMER_COUNTER_0 0
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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 TmrCtrLowLevelExample(u32 TmrCtrBaseAddress, u8 TimerCounter);
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/************************** Variable Definitions *****************************/
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/*****************************************************************************/
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/**
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* This function is the main function of the Tmrctr low level example.
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*
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* @param None.
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*
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* @return XST_SUCCESS to indicate success, else XST_FAILURE to indicate
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* a Failure.
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*
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* @note None.
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*
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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 - Low Level example .
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*/
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Status = TmrCtrLowLevelExample(TMRCTR_BASEADDR, TIMER_COUNTER_0);
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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
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* the low level driver as a design example. The purpose of this function is
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* to illustrate how to use the XTmrCtr low level driver.
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*
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*
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* @param TmrCtrBaseAddress is the base address of the device.
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* @param TmrCtrNumber is the timer counter of the device to operate on.
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* Each device may contain multiple timer counters.
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* The timer number is a zero based number with a range of
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* 0 - (XTC_DEVICE_TIMER_COUNT - 1).
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*
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* @return XST_SUCCESS to indicate success, else XST_FAILURE to indicate
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* a Failure.
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*
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* @note
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*
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* This function contains a loop which waits for the value of a timer counter
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* to change. If the hardware is not working correctly, this function may not
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* return.
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*
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****************************************************************************/
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int TmrCtrLowLevelExample(u32 TmrCtrBaseAddress, u8 TmrCtrNumber)
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{
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u32 Value1;
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u32 Value2;
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u32 ControlStatus;
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/*
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* Clear the Control Status Register
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*/
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XTmrCtr_SetControlStatusReg(TmrCtrBaseAddress, TmrCtrNumber,0x0);
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/*
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* Set the value that is loaded into the timer counter and cause it to
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* be loaded into the timer counter
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*/
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XTmrCtr_SetLoadReg(TmrCtrBaseAddress, TmrCtrNumber, 0xDEADBEEF);
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XTmrCtr_LoadTimerCounterReg(TmrCtrBaseAddress, TmrCtrNumber);
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/*
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* Clear the Load Timer bit in the Control Status Register
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*/
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ControlStatus = XTmrCtr_GetControlStatusReg(TmrCtrBaseAddress,
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TmrCtrNumber);
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XTmrCtr_SetControlStatusReg(TmrCtrBaseAddress, TmrCtrNumber,
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ControlStatus & (~XTC_CSR_LOAD_MASK));
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/*
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* Get a snapshot of the timer counter value before it's started
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* to compare against later
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*/
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Value1 = XTmrCtr_GetTimerCounterReg(TmrCtrBaseAddress, TmrCtrNumber);
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/*
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* Start the timer counter such that it's incrementing by default
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*/
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XTmrCtr_Enable(TmrCtrBaseAddress, TmrCtrNumber);
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/*
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* Read the value of the timer counter and wait for it to change,
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* since it's incrementing it should change, if the hardware is not
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* working for some reason, this loop could be infinite such that the
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* function does not return
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*/
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while (1) {
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Value2 = XTmrCtr_GetTimerCounterReg(TmrCtrBaseAddress, TmrCtrNumber);
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if (Value1 != Value2) {
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break;
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}
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}
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/*
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* Disable the timer counter such that it stops incrementing
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*/
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XTmrCtr_Disable(TmrCtrBaseAddress, TmrCtrNumber);
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return XST_SUCCESS;
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}
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