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authorYuval Adam <yuv.adm@gmail.com>2012-11-07 23:31:05 +0200
committerYuval Adam <yuv.adm@gmail.com>2012-11-07 23:31:05 +0200
commit6cff82a4bc7ed9fcc7e9ad73a4542d5b1e7c1328 (patch)
treea61ddf74a2006a3924becc22c586e1e4073a8645 /drivers/buttons.c
parent3a282de9331ea261eeadca0dd36c0527f173dd4c (diff)
Revert "Move RGB and button drivers 2 dirs up"
This reverts commit 3a282de9331ea261eeadca0dd36c0527f173dd4c.
Diffstat (limited to 'drivers/buttons.c')
-rw-r--r--drivers/buttons.c193
1 files changed, 0 insertions, 193 deletions
diff --git a/drivers/buttons.c b/drivers/buttons.c
deleted file mode 100644
index 4415168..0000000
--- a/drivers/buttons.c
+++ /dev/null
@@ -1,193 +0,0 @@
-//*****************************************************************************
-//
-// buttons.c - Evaluation board driver for push buttons.
-//
-// Copyright (c) 2012 Texas Instruments Incorporated. All rights reserved.
-// Software License Agreement
-//
-// Texas Instruments (TI) is supplying this software for use solely and
-// exclusively on TI's microcontroller products. The software is owned by
-// TI and/or its suppliers, and is protected under applicable copyright
-// laws. You may not combine this software with "viral" open-source
-// software in order to form a larger program.
-//
-// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
-// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
-// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
-// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
-// DAMAGES, FOR ANY REASON WHATSOEVER.
-//
-// This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
-//
-//*****************************************************************************
-
-#include "inc/hw_types.h"
-#include "inc/hw_memmap.h"
-#include "inc/hw_gpio.h"
-#include "driverlib/sysctl.h"
-#include "driverlib/rom.h"
-#include "driverlib/pin_map.h"
-#include "driverlib/gpio.h"
-#include "drivers/buttons.h"
-
-//*****************************************************************************
-//
-//! \addtogroup buttons_api
-//! @{
-//
-//*****************************************************************************
-
-//*****************************************************************************
-//
-// Holds the current, debounced state of each button. A 0 in a bit indicates
-// that that button is currently pressed, otherwise it is released.
-// We assume that we start with all the buttons released (though if one is
-// pressed when the application starts, this will be detected).
-//
-//*****************************************************************************
-static unsigned char g_ucButtonStates = ALL_BUTTONS;
-
-//*****************************************************************************
-//
-//! Polls the current state of the buttons and determines which have changed.
-//!
-//! \param pucDelta points to a character that will be written to indicate
-//! which button states changed since the last time this function was called.
-//! This value is derived from the debounced state of the buttons.
-//! \param pucRawState points to a location where the raw button state will
-//! be stored.
-//!
-//! This function should be called periodically by the application to poll the
-//! pushbuttons. It determines both the current debounced state of the buttons
-//! and also which buttons have changed state since the last time the function
-//! was called.
-//!
-//! In order for button debouncing to work properly, this function should be
-//! caled at a regular interval, even if the state of the buttons is not needed
-//! that often.
-//!
-//! If button debouncing is not required, the the caller can pass a pointer
-//! for the \e pucRawState parameter in order to get the raw state of the
-//! buttons. The value returned in \e pucRawState will be a bit mask where
-//! a 1 indicates the buttons is pressed.
-//!
-//! \return Returns the current debounced state of the buttons where a 1 in the
-//! button ID's position indicates that the button is pressed and a 0
-//! indicates that it is released.
-//
-//*****************************************************************************
-unsigned char
-ButtonsPoll(unsigned char *pucDelta, unsigned char *pucRawState)
-{
- unsigned long ulDelta;
- unsigned long ulData;
- static unsigned char ucSwitchClockA = 0;
- static unsigned char ucSwitchClockB = 0;
-
- //
- // Read the raw state of the push buttons. Save the raw state
- // (inverting the bit sense) if the caller supplied storage for the
- // raw value.
- //
- ulData = (ROM_GPIOPinRead(BUTTONS_GPIO_BASE, ALL_BUTTONS));
- if(pucRawState)
- {
- *pucRawState = (unsigned char)~ulData;
- }
-
- //
- // Determine the switches that are at a different state than the debounced
- // state.
- //
- ulDelta = ulData ^ g_ucButtonStates;
-
- //
- // Increment the clocks by one.
- //
- ucSwitchClockA ^= ucSwitchClockB;
- ucSwitchClockB = ~ucSwitchClockB;
-
- //
- // Reset the clocks corresponding to switches that have not changed state.
- //
- ucSwitchClockA &= ulDelta;
- ucSwitchClockB &= ulDelta;
-
- //
- // Get the new debounced switch state.
- //
- g_ucButtonStates &= ucSwitchClockA | ucSwitchClockB;
- g_ucButtonStates |= (~(ucSwitchClockA | ucSwitchClockB)) & ulData;
-
- //
- // Determine the switches that just changed debounced state.
- //
- ulDelta ^= (ucSwitchClockA | ucSwitchClockB);
-
- //
- // Store the bit mask for the buttons that have changed for return to
- // caller.
- //
- if(pucDelta)
- {
- *pucDelta = (unsigned char)ulDelta;
- }
-
- //
- // Return the debounced buttons states to the caller. Invert the bit
- // sense so that a '1' indicates the button is pressed, which is a
- // sensible way to interpret the return value.
- //
- return(~g_ucButtonStates);
-}
-
-//*****************************************************************************
-//
-//! Initializes the GPIO pins used by the board pushbuttons.
-//!
-//! This function must be called during application initialization to
-//! configure the GPIO pins to which the pushbuttons are attached. It enables
-//! the port used by the buttons and configures each button GPIO as an input
-//! with a weak pull-up.
-//!
-//! \return None.
-//
-//*****************************************************************************
-void
-ButtonsInit(void)
-{
- //
- // Enable the GPIO port to which the pushbuttons are connected.
- //
- ROM_SysCtlPeripheralEnable(BUTTONS_GPIO_PERIPH);
-
- //
- // Unlock PF0 so we can change it to a GPIO input
- // Once we have enabled (unlocked) the commit register then re-lock it
- // to prevent further changes. PF0 is muxed with NMI thus a special case.
- //
- HWREG(BUTTONS_GPIO_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY_DD;
- HWREG(BUTTONS_GPIO_BASE + GPIO_O_CR) |= 0x01;
- HWREG(BUTTONS_GPIO_BASE + GPIO_O_LOCK) = 0;
-
- //
- // Set each of the button GPIO pins as an input with a pull-up.
- //
- ROM_GPIODirModeSet(BUTTONS_GPIO_BASE, ALL_BUTTONS, GPIO_DIR_MODE_IN);
- ROM_GPIOPadConfigSet(BUTTONS_GPIO_BASE, ALL_BUTTONS,
- GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
-
- //
- // Initialize the debounced button state with the current state read from
- // the GPIO bank.
- //
- g_ucButtonStates = ROM_GPIOPinRead(BUTTONS_GPIO_BASE, ALL_BUTTONS);
-}
-
-//*****************************************************************************
-//
-// Close the Doxygen group.
-//! @}
-//
-//*****************************************************************************