175 lines
5.5 KiB
C
175 lines
5.5 KiB
C
/*
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* The Clear BSD License
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted (subject to the limitations in the disclaimer below) provided
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* that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*******************************************************************************
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* Includes
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******************************************************************************/
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#include "fsl_debug_console.h"
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#include "board.h"
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#include "fsl_gpio.h"
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#include "fsl_ewm.h"
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#include "fsl_device_registers.h"
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#include "pin_mux.h"
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#include "clock_config.h"
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/*******************************************************************************
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* Definitions
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******************************************************************************/
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#define SW_GPIO BOARD_SW3_GPIO
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#define SW_GPIO_PIN BOARD_SW3_GPIO_PIN
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#define SW_NAME BOARD_SW3_NAME
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/* GPIO port input low-logic level when SW is pressed */
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#define SW_GPIO_PRESSED_VALUE 0U
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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/*******************************************************************************
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* Variables
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******************************************************************************/
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volatile bool ewmIsrFlag = false;
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static EWM_Type *base = EWM;
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/*******************************************************************************
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* Code
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******************************************************************************/
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/*!
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* @brief Configure gpio as input for button
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*
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*/
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void gpio_configure(void)
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{
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gpio_pin_config_t sw_config = {
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kGPIO_DigitalInput, 0,
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};
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GPIO_PinInit(SW_GPIO, SW_GPIO_PIN, &sw_config);
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}
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/*!
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* @brief Check if button is pressed.
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*
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* This function gets the state of button.
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*
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* @return 0 if button is not pressed.
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* 1 if button is pressed
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*/
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static uint32_t is_key_pressed(void)
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{
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return (GPIO_PinRead(SW_GPIO, SW_GPIO_PIN) == SW_GPIO_PRESSED_VALUE);
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}
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/*!
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* @brief EWM interrupt handler
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*
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*/
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void WDOG_EWM_IRQHandler(void)
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{
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EWM_DisableInterrupts(base, kEWM_InterruptEnable); /*!< de-assert interrupt request */
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ewmIsrFlag = true;
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/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
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exception return operation might vector to incorrect interrupt */
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#if defined __CORTEX_M && (__CORTEX_M == 4U)
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__DSB();
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#endif
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}
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void delay(void)
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{
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for (uint32_t i = 0; i < 0x7fffffU; i++)
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{
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__NOP();
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}
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}
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/*!
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* @brief Main function
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*/
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int main(void)
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{
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ewm_config_t config;
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/* Init hardware*/
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BOARD_InitPins();
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BOARD_BootClockHSRUN();
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BOARD_InitDebugConsole();
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gpio_configure();
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/* EWM peripheral driver test */
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/*
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* config.enableEwm = true;
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* config.enableEwmInput = false;
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* config.setInputAssertLogic = false;
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* config.enableInterrupt = false;
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* config.clockSource = kEWM_LpoClockSource0;
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* config.prescaler = 0U;
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* config.compareLowValue = 0U;
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* config.compareHighValue = 0xFEU;
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*/
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EWM_GetDefaultConfig(&config);
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config.enableInterrupt = true;
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NVIC_EnableIRQ(WDOG_EWM_IRQn);
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EWM_Init(base, &config);
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PRINTF("\r\n EWM example ");
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PRINTF("\r\n Press %s to expire EWM ", SW_NAME);
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while (1)
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{
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/* Restart counter*/
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EWM_Refresh(base);
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/* Check for SW button push*/
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if (is_key_pressed())
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{
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/*Check ewm interrupt occur*/
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while (!ewmIsrFlag)
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{
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}
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PRINTF("\r\n EWM interrupt is occurred");
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/* Clear interrupt flag*/
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ewmIsrFlag = false;
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PRINTF("\r\n Press %s to expire EWM again", SW_NAME);
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/*Restart counter and enable interrupt for next run*/
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EWM_Refresh(base);
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/* Delay for a while in order to press button, interrrupt occurred only once*/
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delay();
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/*Enable EWM interrupt*/
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EWM_EnableInterrupts(base, kEWM_InterruptEnable);
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}
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}
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}
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