1 files changed, 147 insertions, 0 deletions
diff --git a/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c b/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c
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+++ b/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c
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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 ? "released" : "pressed");
+            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
+ ******************************************************************************/