95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
/************************************************************************************//**
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* \file Demo\ARM7_LPC2000_Olimex_LPC_L2294_GCC\Prog\led.c
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* \brief LED driver source file.
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* \ingroup Prog_ARM7_LPC2000_Olimex_LPC_L2294_GCC
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* \internal
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*----------------------------------------------------------------------------------------
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* C O P Y R I G H T
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*----------------------------------------------------------------------------------------
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* Copyright (c) 2011 by Feaser http://www.feaser.com All rights reserved
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*
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*----------------------------------------------------------------------------------------
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* L I C E N S E
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*----------------------------------------------------------------------------------------
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* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You have received a copy of the GNU General Public License along with OpenBLT. It
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* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
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*
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* \endinternal
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "header.h" /* generic header */
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/****************************************************************************************
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* Macro definitions
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****************************************************************************************/
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/** \brief Toggle interval time in milliseconds. */
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#define LED_TOGGLE_MS (500)
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/************************************************************************************//**
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** \brief Initializes the LED.
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** \return none.
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**
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****************************************************************************************/
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void LedInit(void)
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{
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/* set io pins for led P1.23 */
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IO1DIR |= 0x00800000;
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/* turn the led off */
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IO1SET = 0x00800000;
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} /*** end of LedInit ***/
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/************************************************************************************//**
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** \brief Toggles the LED at a fixed time interval.
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** \return none.
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**
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****************************************************************************************/
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void LedToggle(void)
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{
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static unsigned char led_toggle_state = 0;
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static unsigned long timer_counter_last = 0;
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unsigned long timer_counter_now;
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/* check if toggle interval time passed */
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timer_counter_now = TimerGet();
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if ( (timer_counter_now - timer_counter_last) < LED_TOGGLE_MS)
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{
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/* not yet time to toggle */
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return;
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}
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/* determine toggle action */
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if (led_toggle_state == 0)
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{
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led_toggle_state = 1;
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/* turn the LED on */
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IO1CLR = 0x00800000;
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}
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else
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{
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led_toggle_state = 0;
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/* turn the LED off */
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IO1SET = 0x00800000;
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}
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/* store toggle time to determine next toggle interval */
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timer_counter_last = timer_counter_now;
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} /*** end of LedToggle ***/
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/*********************************** end of led.c **************************************/
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