97 lines
3.8 KiB
C
97 lines
3.8 KiB
C
/************************************************************************************//**
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* \file Demo/ARMCM0_S32K14_S32K118EVB_IAR/Prog/led.c
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* \brief LED driver source file.
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* \ingroup Prog_ARMCM0_S32K14_S32K118EVB_IAR
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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) 2020 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 (500U)
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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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/* LED GPIO pin configuration. PE8 = GPIO, MUX = ALT1. */
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PORTE->PCR[8] = PORT_PCR_MUX(1);
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/* Configure Port E pin 8 GPIO as digital output. */
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PTE->PDDR |= GPIO_PDDR_PDD(1 << 8U);
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/* Turn the LED off on Port E pin 8. */
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PTE->PCOR |= GPIO_PSOR_PTSO(1 << 8U);
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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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PTE->PSOR |= GPIO_PSOR_PTSO(1 << 8U);
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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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PTE->PCOR |= GPIO_PSOR_PTSO(1 << 8U);
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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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