163 lines
5.6 KiB
C
163 lines
5.6 KiB
C
/*
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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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 provided 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 Freescale Semiconductor, Inc. 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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* 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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#include "gpio_imx.h"
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/*******************************************************************************
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* Code
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******************************************************************************/
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/*******************************************************************************
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* GPIO Initialization and Configuration functions
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******************************************************************************/
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/*FUNCTION**********************************************************************
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*
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* Function Name : GPIO_Init
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* Description : Initializes the GPIO module according to the specified
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* parameters in the initConfig.
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*
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*END**************************************************************************/
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void GPIO_Init(GPIO_Type* base, const gpio_init_config_t* initConfig)
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{
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uint32_t pin;
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volatile uint32_t *icr;
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/* Register reset to default value */
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GPIO_IMR_REG(base) = 0;
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GPIO_EDGE_SEL_REG(base) = 0;
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/* Get pin number */
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pin = initConfig->pin;
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/* Configure GPIO pin direction */
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if (initConfig->direction == gpioDigitalOutput)
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GPIO_GDIR_REG(base) |= (1U << pin);
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else
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GPIO_GDIR_REG(base) &= ~(1U << pin);
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/* Configure GPIO pin interrupt mode */
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if(pin < 16)
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icr = &GPIO_ICR1_REG(base);
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else
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{
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icr = &GPIO_ICR2_REG(base);
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pin -= 16;
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}
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switch(initConfig->interruptMode)
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{
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case(gpioIntLowLevel):
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{
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*icr &= ~(0x3<<(2*pin));
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break;
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}
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case(gpioIntHighLevel):
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{
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*icr = (*icr & (~(0x3<<(2*pin)))) | (0x1<<(2*pin));
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break;
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}
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case(gpioIntRisingEdge):
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{
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*icr = (*icr & (~(0x3<<(2*pin)))) | (0x2<<(2*pin));
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break;
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}
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case(gpioIntFallingEdge):
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{
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*icr |= (0x3<<(2*pin));
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break;
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}
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case(gpioNoIntmode):
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{
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break;
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}
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}
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}
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/*******************************************************************************
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* GPIO Read and Write Functions
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******************************************************************************/
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/*FUNCTION**********************************************************************
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*
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* Function Name : GPIO_WritePinOutput
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* Description : Sets the output level of the individual GPIO pin.
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*
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*END**************************************************************************/
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void GPIO_WritePinOutput(GPIO_Type* base, uint32_t pin, gpio_pin_action_t pinVal)
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{
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assert(pin < 32);
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if (pinVal == gpioPinSet)
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{
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GPIO_DR_REG(base) |= (1U << pin); /* Set pin output to high level.*/
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}
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else
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{
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GPIO_DR_REG(base) &= ~(1U << pin); /* Set pin output to low level.*/
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}
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}
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/*******************************************************************************
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* Interrupts and flags management functions
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******************************************************************************/
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/*FUNCTION**********************************************************************
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*
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* Function Name : GPIO_SetPinIntMode
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* Description : Enable or Disable the specific pin interrupt.
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*
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*END**************************************************************************/
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void GPIO_SetPinIntMode(GPIO_Type* base, uint32_t pin, bool enable)
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{
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assert(pin < 32);
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if(enable)
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GPIO_IMR_REG(base) |= (1U << pin);
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else
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GPIO_IMR_REG(base) &= ~(1U << pin);
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : GPIO_SetIntEdgeSelect
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* Description : Enable or Disable the specific pin interrupt.
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*
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*END**************************************************************************/
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void GPIO_SetIntEdgeSelect(GPIO_Type* base, uint32_t pin, bool enable)
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{
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assert(pin < 32);
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if(enable)
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GPIO_EDGE_SEL_REG(base) |= (1U << pin);
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else
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GPIO_EDGE_SEL_REG(base) &= ~(1U << pin);
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}
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/*******************************************************************************
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* EOF
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******************************************************************************/
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