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584 |
jeremybenn |
/**
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* @file hal_buttons.c
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*
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* Copyright 2010 Texas Instruments, Inc.
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***************************************************************************/
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#include "msp430.h"
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#include "hal_MSP-EXP430F5438.h"
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/**********************************************************************//**
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* @brief Initializes the GPIO ports to act as buttons.
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*
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* @param buttonsMask The mask that specifies the button pins.
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*
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* @return none
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*************************************************************************/
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void halButtonsInit(unsigned char buttonsMask)
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{
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BUTTON_PORT_OUT |= buttonsMask;
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BUTTON_PORT_DIR &= ~buttonsMask;
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BUTTON_PORT_REN |= buttonsMask;
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BUTTON_PORT_SEL &= ~buttonsMask;
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}
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/**********************************************************************//**
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* @brief Returns LOW for the buttons pressed.
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*
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* @param none
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*
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* @return The buttons that have been pressed, identified by a bit = 0.
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*************************************************************************/
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unsigned char halButtonsPressed(void)
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{
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unsigned char value;
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value = BUTTON_PORT_IN;
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return (0xFF - value); //Low==ButtonPressed
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}
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/**********************************************************************//**
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* @brief Enables button interrupt(s) with low to high transitions.
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*
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* @param buttonIntEnableMask The button pin(s) for which the interrupt(s)
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* should be enabled.
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*
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* @return none
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*************************************************************************/
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void halButtonsInterruptEnable(unsigned char buttonIntEnableMask)
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{
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BUTTON_PORT_IES &= ~buttonIntEnableMask;
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BUTTON_PORT_IFG &= ~buttonIntEnableMask;
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BUTTON_PORT_IE |= buttonIntEnableMask;
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}
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/**********************************************************************//**
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* @brief Disables button interrupts
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*
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* @param buttonIntEnableMask The button pin(s) for which the interrupt(s)
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* should be disabled.
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*
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* @return none
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*************************************************************************/
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void halButtonsInterruptDisable(unsigned char buttonIntEnableMask)
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{
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BUTTON_PORT_IE &= ~buttonIntEnableMask;
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}
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/**********************************************************************//**
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* @brief Clears the button GPIO settings, disables the buttons.
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*
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* @param none
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*************************************************************************/
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void halButtonsShutDown()
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{
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//All output, outputting 0s
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BUTTON_PORT_OUT &= ~(BUTTON_ALL);
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BUTTON_PORT_DIR |= BUTTON_ALL;
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}
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