想实现1ms的定时中断。
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通常RTI时钟为75MHz(由HAlCoGen生成的代码)。如果计数器频率为9.375MHz(UC compare = 7),则可以通过设置compare 0 为9375并更新compare 0寄存器来获得1 ms的中断。
另外您可以参考一下下面的程序
/** @example example_rtiBlinky.c * This is an example which descibes the steps to create an example application which * toggles the High End Timer (HET) pin 1 based on an RTI timer compare 0 tick of one second. * * @b Step @b 1: * * Create a new project. * * Navigate: -> File -> New -> Project * * @image html example_createProject.jpg "Figure: Create a new Project" * * @b Step @b 2: * * Configure driver code generation: * - Enable RTI driver * - Enable GIO driver * - Disable others * * Navigate: -> TMS570LCxx /RM57xx -> Enable Drivers * * @image html example_rtiBlinky_enableDrivers.jpg "Figure: Driver Configuration" * * @b Step @b 3: * * Configure Vectored Interrupt Module Channels: * - Map VIM Channel 2 to RTI Compare 0 interrupt * - Enable VIM Channel 2 * - Map VIM Channel 2 to IRQ * * Navigate: -> TMS570LCxx /RM5x -> VIM Channel 0-31 * * @image html example_rtiBlinky_vimChannelView.jpg "Figure: VIM Channel Configuration" * * @b Step @b 4: * * Configure RTI compare 0 period to 1000 ms: * - Enter 1000.000 to Compare 0 Period edit box * * Navigate: -> RTI -> RTI1 Compare * * @image html example_rtiBlinky_rti1CompareView.jpg "Figure: RTI Compare Configuration" * * @b Step @b 5: * * Generate code * * Navigate: -> File -> Generate Code * * @image html generateCode.jpg "Figure: Generate Code" * * @b Step @b 6: * * Copy source code below into your application. * * The example file example_rtiBlinky.c can also be found in the examples folder: ../HALCoGen/examples * * @note HALCoGen generates an enpty main function in sys_main.c, * please make sure that you link in the right main function or copy the source into the user code sections of this file. * */ /** @file sys_main.c * @brief Application main file * @date 25.July.2013 * @version 03.06.00 * * This file contains an empty main function, * which can be used for the application. */ /* (c) Texas Instruments 2009-2013, All rights reserved. */ /* * Copyright (C) 2009-2015 Texas Instruments Incorporated - www.ti.com * * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the * distribution. * * Neither the name of Texas Instruments Incorporated nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /* USER CODE BEGIN (0) */ /* USER CODE END */ /* Include Files */ #include "HL_sys_common.h" #include "HL_system.h" /* USER CODE BEGIN (1) */ #include "HL_sys_core.h" #include "HL_mibspi.h" #include "HL_esm.h" #include "HL_rti.h" #include "HL_gio.h" #include "HL_het.h" /* USER CODE END */ /** @fn void main(void) * @brief Application main function * @note This function is empty by default. * * This function is called after startup. * The user can use this function to implement the application. */ /* USER CODE BEGIN (2) */ /* USER CODE END */ void main(void) { /* USER CODE BEGIN (3) */ /* Initialize RTI driver */ rtiInit(); /* Set high end timer GIO port hetPort pin direction to all output */ gioSetDirection(hetPORT1, 0xFFFFFFFF); /* Enable RTI Compare 0 interrupt notification */ rtiEnableNotification(rtiREG1,rtiNOTIFICATION_COMPARE0); /* Enable IRQ - Clear I flag in CPS register */ /* Note: This is usually done by the OS or in an svc dispatcher */ _enable_IRQ_interrupt_(); /* Start RTI Counter Block 0 */ rtiStartCounter(rtiREG1,rtiCOUNTER_BLOCK0); /* Run forever */ while(1); /* USER CODE END */ } /* USER CODE BEGIN (4) */ /* Note-You need to remove rtiNotification from notification.c to avoid redefinition */ void rtiNotification(rtiBASE_t *rtiREG, uint32 notification) { /* enter user code between the USER CODE BEGIN and USER CODE END. */ /* Toggle HET pin 0 */ gioSetPort(hetPORT1, gioGetPort(hetPORT1) ^ 0x00000001); } /* USER CODE END */