101 lines
3.9 KiB
C
101 lines
3.9 KiB
C
/****************************************************************************************
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| Description: LED driver source file
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| File Name: led.c
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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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| L I C E N S E
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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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| 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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| You should have received a copy of the GNU General Public License along with OpenBLT.
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| If not, see <http://www.gnu.org/licenses/>.
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| A special exception to the GPL is included to allow you to distribute a combined work
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| that includes OpenBLT without being obliged to provide the source code for any
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| proprietary components. The exception text is included at the bottom of the license
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| file <license.html>.
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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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#define LED_TOGGLE_MS (500) /* toggle interval time in millisecodns */
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/****************************************************************************************
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** NAME: LedInit
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Initializes the LED.
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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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** NAME: LedToggle
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Toggles the LED at a fixed time interval.
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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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