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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o 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.
*
* o Neither the name of Freescale Semiconductor, Inc. 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 HOLDER 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.
*/
#include <stdio.h>
#include "board.h"
#include "gpio_pins.h"
#include "gpio_imx.h"
#include "debug_console_imx.h"
/* button relevent variables */
static volatile uint8_t keyPressCount;
static uint8_t keyLastState;
static uint8_t keyState;
/******************************************************************************
*
* Function Name: main
* Comments: GPIO module initialize, interrupt and IO operation.
* This example include 2 step:
* 1)Configure BUTTON1 as interrupt mode, falling edge, and test
* by pressing the button 3 times to trigger interrupt.
* 2)Configure BUTTON1 as GPIO functionality
* and check the button's state(pressed or released) through switch LED
* to on or off if this board has LED.
*
******************************************************************************/
int main( void )
{
/* hardware initialiize, include RDC, IOMUX, Uart debug initialize */
hardware_init();
PRINTF("\n\r====================== GPIO Example ========================\n\r");
#ifdef BOARD_GPIO_LED_CONFIG
/* GPIO module initialize, configure "LED" as output and drive the output high level */
gpio_init_t ledInitConfig = {
.pin = BOARD_GPIO_LED_CONFIG->pin,
.direction = gpioDigitalOutput,
.interruptMode = gpioNoIntmode
};
GPIO_Init(BOARD_GPIO_LED_CONFIG->base, &ledInitConfig);
/* drive the LED output high level. */
GPIO_WritePinOutput(BOARD_GPIO_LED_CONFIG->base, BOARD_GPIO_LED_CONFIG->pin, gpioPinSet);
#endif
#ifdef BOARD_GPIO_KEY_CONFIG
/* GPIO module initialize, configure button as interrupt mode. */
gpio_init_t keyInitConfig = {
.pin = BOARD_GPIO_KEY_CONFIG->pin,
.direction = gpioDigitalInput,
.interruptMode = gpioIntFallingEdge
};
GPIO_Init(BOARD_GPIO_KEY_CONFIG->base, &keyInitConfig);
NVIC_EnableIRQ(BOARD_GPIO_KEY_IRQ_NUM);
/* Clear the interrupt state, this operation is necessary, because the GPIO module maybe confuse
the first rising edge as interrupt*/
GPIO_ClearStatusFlag(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin);
/* Enable GPIO pin interrupt */
GPIO_SetPinIntMode(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin, true);
/* press button trigger interrupt */
PRINTF("\n\r=================== GPIO Interrupt =====================\n\r");
PRINTF("The (%s) button is configured to trigger GPIO interrupt.\n\r", BOARD_GPIO_KEY_CONFIG->name);
PRINTF("Press the (%s) button 3 times to continue.\n\n\r", BOARD_GPIO_KEY_CONFIG->name);
keyPressCount = 1;
while(keyPressCount < 4);
/* Now disable the interrupt */
NVIC_DisableIRQ(BOARD_GPIO_KEY_IRQ_NUM);
GPIO_SetPinIntMode(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin, false);
/* GPIO module initialize, configure button as GPIO functionality. */
keyInitConfig.pin = BOARD_GPIO_KEY_CONFIG->pin;
keyInitConfig.direction = gpioDigitalInput;
keyInitConfig.interruptMode = gpioNoIntmode;
GPIO_Init(BOARD_GPIO_KEY_CONFIG->base, &keyInitConfig);
/* Configure button as GPIO functionality
and check the button's state(pressed or released) to switch LED on or off */
/* Check the buttion's status(pressed or released) */
PRINTF("\n\r================= GPIO Functionality==================\n\r");
PRINTF("The (%s) button state is now polled.\n\r", BOARD_GPIO_KEY_CONFIG->name);
PRINTF("Press the (%s) button to switch LED on or off\n\n\r", BOARD_GPIO_KEY_CONFIG->name);
keyLastState = 1; //initial button released, logic 1
for(;;)
{
keyState = GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin);
if(keyState != keyLastState)
{
PRINTF("Button %s\n\r", keyState ? "pressed" : "released");
keyLastState = keyState;
#ifdef BOARD_GPIO_LED_CONFIG
GPIO_WritePinOutput(BOARD_GPIO_LED_CONFIG->base, BOARD_GPIO_LED_CONFIG->pin, keyState ? gpioPinSet : gpioPinClear);
#endif
}
}
#endif
}
/******************************************************************************
* Function Name: BOARD_GPIO_BTN_HANDLER
* Comments: The interrupt service routine triggered by gpio
* Note: Need to consider how to eliminate the button shake problem
******************************************************************************/
void BOARD_GPIO_KEY_HANDLER(void)
{
PRINTF("Button pressed %d time. \n\r", keyPressCount);
keyPressCount++;
/* clear the interrupt status */
GPIO_ClearStatusFlag(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin);
}
/*******************************************************************************
* EOF
******************************************************************************/
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