574 lines
19 KiB
C
574 lines
19 KiB
C
/**************************************************************************************************
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Filename: hal_key.c
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Revised: $Date: 2010-09-15 19:02:45 -0700 (Wed, 15 Sep 2010) $
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Revision: $Revision: 23815 $
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Description: This file contains the interface to the HAL KEY Service.
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Copyright 2006-2010 Texas Instruments Incorporated. All rights reserved.
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IMPORTANT: Your use of this Software is limited to those specific rights
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granted under the terms of a software license agreement between the user
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who downloaded the software, his/her employer (which must be your employer)
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and Texas Instruments Incorporated (the "License"). You may not use this
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Software unless you agree to abide by the terms of the License. The License
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limits your use, and you acknowledge, that the Software may not be modified,
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copied or distributed unless embedded on a Texas Instruments microcontroller
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or used solely and exclusively in conjunction with a Texas Instruments radio
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frequency transceiver, which is integrated into your product. Other than for
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the foregoing purpose, you may not use, reproduce, copy, prepare derivative
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works of, modify, distribute, perform, display or sell this Software and/or
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its documentation for any purpose.
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YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
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PROVIDED “AS IS?WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
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INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, TITLE,
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NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL
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TEXAS INSTRUMENTS OR ITS LICENSORS BE LIABLE OR OBLIGATED UNDER CONTRACT,
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NEGLIGENCE, STRICT LIABILITY, CONTRIBUTION, BREACH OF WARRANTY, OR OTHER
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LEGAL EQUITABLE THEORY ANY DIRECT OR INDIRECT DAMAGES OR EXPENSES
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INCLUDING BUT NOT LIMITED TO ANY INCIDENTAL, SPECIAL, INDIRECT, PUNITIVE
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OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF PROCUREMENT
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OF SUBSTITUTE GOODS, TECHNOLOGY, SERVICES, OR ANY CLAIMS BY THIRD PARTIES
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(INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF), OR OTHER SIMILAR COSTS.
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Should you have any questions regarding your right to use this Software,
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contact Texas Instruments Incorporated at www.TI.com.
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**************************************************************************************************/
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/*********************************************************************
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NOTE: If polling is used, the hal_driver task schedules the KeyRead()
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to occur every 100ms. This should be long enough to naturally
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debounce the keys. The KeyRead() function remembers the key
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state of the previous poll and will only return a non-zero
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value if the key state changes.
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NOTE: If interrupts are used, the KeyRead() function is scheduled
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25ms after the interrupt occurs by the ISR. This delay is used
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for key debouncing. The ISR disables any further Key interrupt
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until KeyRead() is executed. KeyRead() will re-enable Key
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interrupts after executing. Unlike polling, when interrupts
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are enabled, the previous key state is not remembered. This
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means that KeyRead() will return the current state of the keys
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(not a change in state of the keys).
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NOTE: If interrupts are used, the KeyRead() fucntion is scheduled by
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the ISR. Therefore, the joystick movements will only be detected
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during a pushbutton interrupt caused by S1 or the center joystick
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pushbutton.
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NOTE: When a switch like S1 is pushed, the S1 signal goes from a normally
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high state to a low state. This transition is typically clean. The
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duration of the low state is around 200ms. When the signal returns
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to the high state, there is a high likelihood of signal bounce, which
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causes a unwanted interrupts. Normally, we would set the interrupt
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edge to falling edge to generate an interrupt when S1 is pushed, but
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because of the signal bounce, it is better to set the edge to rising
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edge to generate an interrupt when S1 is released. The debounce logic
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can then filter out the signal bounce. The result is that we typically
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get only 1 interrupt per button push. This mechanism is not totally
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foolproof because occasionally, signal bound occurs during the falling
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edge as well. A similar mechanism is used to handle the joystick
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pushbutton on the DB. For the EB, we do not have independent control
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of the interrupt edge for the S1 and center joystick pushbutton. As
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a result, only one or the other pushbuttons work reasonably well with
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interrupts. The default is the make the S1 switch on the EB work more
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reliably.
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*********************************************************************/
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/**************************************************************************************************
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* INCLUDES
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**************************************************************************************************/
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#include "hal_mcu.h"
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#include "hal_defs.h"
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#include "hal_types.h"
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#include "hal_board.h"
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#include "hal_drivers.h"
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#include "hal_adc.h"
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#include "hal_key.h"
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#include "osal.h"
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//#include "SampleApp.h"
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#include "demoapp.h"
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#if (defined HAL_KEY) && (HAL_KEY == TRUE)
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/**************************************************************************************************
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* MACROS
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**************************************************************************************************/
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/**************************************************************************************************
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* CONSTANTS
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**************************************************************************************************/
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#define HAL_KEY_RISING_EDGE 0
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#define HAL_KEY_FALLING_EDGE 1
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#define HAL_KEY_DEBOUNCE_VALUE 25
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/* CPU port interrupt */
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#define HAL_KEY_CPU_PORT_0_IF P0IF
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#define HAL_KEY_CPU_PORT_2_IF P2IF
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/* SW_6 is at P0.1 */
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#define HAL_KEY_SW_6_PORT P0
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#define HAL_KEY_SW_6_BIT BV(1)
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#define HAL_KEY_SW_5_BIT BV(0)
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#define HAL_KEY_SW_6_SEL P0SEL
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#define HAL_KEY_SW_6_DIR P0DIR
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/* edge interrupt */
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#define HAL_KEY_SW_6_EDGEBIT BV(0)
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#define HAL_KEY_SW_6_EDGE HAL_KEY_FALLING_EDGE
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/* SW_6 interrupts */
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#define HAL_KEY_SW_6_IEN IEN1 /* CPU interrupt mask register */
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#define HAL_KEY_SW_6_IENBIT BV(5) /* Mask bit for all of Port_0 */
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#define HAL_KEY_SW_6_ICTL P0IEN /* Port Interrupt Control register */
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#define HAL_KEY_SW_6_ICTLBIT BV(1) /* P0IEN - P0.1 enable/disable bit */
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#define HAL_KEY_SW_5_ICTLBIT BV(0) /* P0IEN - P0.1 enable/disable bit */
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#define HAL_KEY_SW_6_PXIFG P0IFG /* Interrupt flag at source */
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/* Joy stick move at P2.0 */
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#define HAL_KEY_JOY_MOVE_PORT P2
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#define HAL_KEY_JOY_MOVE_BIT BV(0)
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#define HAL_KEY_JOY_MOVE_SEL P2SEL
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#define HAL_KEY_JOY_MOVE_DIR P2DIR
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/* edge interrupt */
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#define HAL_KEY_JOY_MOVE_EDGEBIT BV(3)
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#define HAL_KEY_JOY_MOVE_EDGE HAL_KEY_FALLING_EDGE
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/* Joy move interrupts */
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#define HAL_KEY_JOY_MOVE_IEN IEN2 /* CPU interrupt mask register */
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#define HAL_KEY_JOY_MOVE_IENBIT BV(1) /* Mask bit for all of Port_2 */
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#define HAL_KEY_JOY_MOVE_ICTL P2IEN /* Port Interrupt Control register */
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#define HAL_KEY_JOY_MOVE_ICTLBIT BV(0) /* P2IENL - P2.0<->P2.3 enable/disable bit */
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#define HAL_KEY_JOY_MOVE_PXIFG P2IFG /* Interrupt flag at source */
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#define HAL_KEY_JOY_CHN HAL_ADC_CHANNEL_6
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/**************************************************************************************************
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* TYPEDEFS
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**************************************************************************************************/
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/**************************************************************************************************
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* GLOBAL VARIABLES
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**************************************************************************************************/
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static uint8 halKeySavedKeys; /* used to store previous key state in polling mode */
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static halKeyCBack_t pHalKeyProcessFunction;
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static uint8 HalKeyConfigured;
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bool Hal_KeyIntEnable; /* interrupt enable/disable flag */
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/**************************************************************************************************
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* FUNCTIONS - Local
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**************************************************************************************************/
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void halProcessKeyInterrupt(void);
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uint8 halGetJoyKeyInput(void);
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/**************************************************************************************************
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* FUNCTIONS - API
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**************************************************************************************************/
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/**************************************************************************************************
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* @fn HalKeyInit
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*
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* @brief Initilize Key Service
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*
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* @param none
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*
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* @return None
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**************************************************************************************************/
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void HalKeyInit( void )
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{
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/* Initialize previous key to 0 */
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halKeySavedKeys = 0;
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HAL_KEY_SW_6_SEL &= ~(HAL_KEY_SW_6_BIT); /* Set pin function to GPIO */
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HAL_KEY_SW_6_DIR &= ~(HAL_KEY_SW_6_BIT); /* Set pin direction to Input */
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HAL_KEY_SW_6_SEL &= ~(HAL_KEY_SW_5_BIT); /* Set pin function to GPIO */
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HAL_KEY_SW_6_DIR &= ~(HAL_KEY_SW_5_BIT); /* Set pin direction to Input */
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HAL_KEY_JOY_MOVE_SEL &= ~(HAL_KEY_JOY_MOVE_BIT); /* Set pin function to GPIO */
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HAL_KEY_JOY_MOVE_DIR &= ~(HAL_KEY_JOY_MOVE_BIT); /* Set pin direction to Input */
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/* Initialize callback function */
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pHalKeyProcessFunction = NULL;
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/* Start with key is not configured */
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HalKeyConfigured = FALSE;
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}
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/**************************************************************************************************
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* @fn HalKeyConfig
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*
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* @brief Configure the Key serivce
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*
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* @param interruptEnable - TRUE/FALSE, enable/disable interrupt
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* cback - pointer to the CallBack function
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*
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* @return None
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**************************************************************************************************/
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void HalKeyConfig (bool interruptEnable, halKeyCBack_t cback)
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{
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/* Enable/Disable Interrupt or */
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Hal_KeyIntEnable = interruptEnable;
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/* Register the callback fucntion */
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pHalKeyProcessFunction = cback;
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/* Determine if interrupt is enable or not */
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if (Hal_KeyIntEnable)
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{
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/* Rising/Falling edge configuratinn */
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PICTL &= ~(HAL_KEY_SW_6_EDGEBIT); /* Clear the edge bit */
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/* For falling edge, the bit must be set. */
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#if (HAL_KEY_SW_6_EDGE == HAL_KEY_FALLING_EDGE)
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PICTL |= HAL_KEY_SW_6_EDGEBIT;
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#endif
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/* Interrupt configuration:
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* - Enable interrupt generation at the port
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* - Enable CPU interrupt
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* - Clear any pending interrupt
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*/
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HAL_KEY_SW_6_ICTL |= HAL_KEY_SW_6_ICTLBIT;
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HAL_KEY_SW_6_ICTL |= HAL_KEY_SW_5_ICTLBIT;
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HAL_KEY_SW_6_IEN |= HAL_KEY_SW_6_IENBIT;
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HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT);
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HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_5_BIT);
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/* Rising/Falling edge configuratinn */
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HAL_KEY_JOY_MOVE_ICTL &= ~(HAL_KEY_JOY_MOVE_EDGEBIT); /* Clear the edge bit */
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/* For falling edge, the bit must be set. */
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#if (HAL_KEY_JOY_MOVE_EDGE == HAL_KEY_FALLING_EDGE)
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HAL_KEY_JOY_MOVE_ICTL |= HAL_KEY_JOY_MOVE_EDGEBIT;
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#endif
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/* Interrupt configuration:
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* - Enable interrupt generation at the port
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* - Enable CPU interrupt
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* - Clear any pending interrupt
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*/
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HAL_KEY_JOY_MOVE_ICTL |= HAL_KEY_JOY_MOVE_ICTLBIT;
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HAL_KEY_JOY_MOVE_IEN |= HAL_KEY_JOY_MOVE_IENBIT;
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HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT);
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/* Do this only after the hal_key is configured - to work with sleep stuff */
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if (HalKeyConfigured == TRUE)
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{
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osal_stop_timerEx(Hal_TaskID, HAL_KEY_EVENT); /* Cancel polling if active */
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}
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}
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else /* Interrupts NOT enabled */
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{
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HAL_KEY_SW_6_ICTL &= ~(HAL_KEY_SW_6_ICTLBIT); /* don't generate interrupt */
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HAL_KEY_SW_6_ICTL &= ~(HAL_KEY_SW_5_ICTLBIT); /* don't generate interrupt */
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HAL_KEY_SW_6_IEN &= ~(HAL_KEY_SW_6_IENBIT); /* Clear interrupt enable bit */
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osal_set_event(Hal_TaskID, HAL_KEY_EVENT);
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}
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/* Key now is configured */
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HalKeyConfigured = TRUE;
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}
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/**************************************************************************************************
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* @fn HalKeyRead
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*
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* @brief Read the current value of a key
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*
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* @param None
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*
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* @return keys - current keys status
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**************************************************************************************************/
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uint8 HalKeyRead ( void )
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{
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uint8 keys = 0;
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if (HAL_PUSH_BUTTON1())
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{
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keys |= HAL_KEY_SW_6;
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}
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if ((HAL_KEY_JOY_MOVE_PORT & HAL_KEY_JOY_MOVE_BIT)) /* Key is active low */
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{
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keys |= halGetJoyKeyInput();
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}
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return keys;
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}
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/**************************************************************************************************
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* @fn HalKeyPoll
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*
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* @brief Called by hal_driver to poll the keys
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*
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* @param None
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*
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* @return None
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**************************************************************************************************/
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void HalKeyPoll (void)
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{
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uint8 keys = 0;
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if ((HAL_KEY_JOY_MOVE_PORT & HAL_KEY_JOY_MOVE_BIT)) /* Key is active HIGH */
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{
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keys = halGetJoyKeyInput();
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}
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/* If interrupts are not enabled, previous key status and current key status
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* are compared to find out if a key has changed status.
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*/
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if (!Hal_KeyIntEnable)
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{
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if (keys == halKeySavedKeys)
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{
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/* Exit - since no keys have changed */
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return;
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}
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/* Store the current keys for comparation next time */
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halKeySavedKeys = keys;
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}
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else
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{
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/* Key interrupt handled here */
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}
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if (HAL_PUSH_BUTTON1())
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{
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keys |= HAL_KEY_SW_6;
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}
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/* Invoke Callback if new keys were depressed */
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if (keys && (pHalKeyProcessFunction))
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{
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(pHalKeyProcessFunction) (keys, HAL_KEY_STATE_NORMAL);
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}
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}
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/**************************************************************************************************
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* @fn halGetJoyKeyInput
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*
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* @brief Map the ADC value to its corresponding key.
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*
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* @param None
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*
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* @return keys - current joy key status
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**************************************************************************************************/
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uint8 halGetJoyKeyInput(void)
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{
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/* The joystick control is encoded as an analog voltage.
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* Read the JOY_LEVEL analog value and map it to joy movement.
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*/
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uint8 adc;
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uint8 ksave0 = 0;
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uint8 ksave1;
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/* Keep on reading the ADC until two consecutive key decisions are the same. */
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do
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{
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ksave1 = ksave0; /* save previouse key reading */
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adc = HalAdcRead (HAL_KEY_JOY_CHN, HAL_ADC_RESOLUTION_8);
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if ((adc >= 2) && (adc <= 38))
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{
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ksave0 |= HAL_KEY_UP;
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}
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else if ((adc >= 74) && (adc <= 88))
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{
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ksave0 |= HAL_KEY_RIGHT;
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}
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else if ((adc >= 60) && (adc <= 73))
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{
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ksave0 |= HAL_KEY_LEFT;
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}
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else if ((adc >= 39) && (adc <= 59))
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{
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ksave0 |= HAL_KEY_DOWN;
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}
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else if ((adc >= 89) && (adc <= 100))
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{
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ksave0 |= HAL_KEY_CENTER;
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}
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} while (ksave0 != ksave1);
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return ksave0;
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}
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/**************************************************************************************************
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* @fn halProcessKeyInterrupt
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*
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* @brief Checks to see if it's a valid key interrupt, saves interrupt driven key states for
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* processing by HalKeyRead(), and debounces keys by scheduling HalKeyRead() 25ms later.
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*
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* @param
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*
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* @return
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**************************************************************************************************/
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void halProcessKeyInterrupt (void)
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{
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bool valid=FALSE;
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if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_6_BIT) /* Interrupt Flag has been set */
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{
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HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT); /* Clear Interrupt Flag */
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valid = TRUE;
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}
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if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_5_BIT) /* Interrupt Flag has been set */
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{
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HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_5_BIT); /* Clear Interrupt Flag */
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valid = TRUE;
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}
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if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT) /* Interrupt Flag has been set */
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{
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HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT); /* Clear Interrupt Flag */
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valid = TRUE;
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}
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if (valid)
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{
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osal_start_timerEx (Hal_TaskID, HAL_KEY_EVENT, HAL_KEY_DEBOUNCE_VALUE);
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}
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}
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/**************************************************************************************************
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* @fn HalKeyEnterSleep
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*
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* @brief - Get called to enter sleep mode
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*
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* @param
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*
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* @return
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**************************************************************************************************/
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void HalKeyEnterSleep ( void )
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{
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}
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/**************************************************************************************************
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* @fn HalKeyExitSleep
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*
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* @brief - Get called when sleep is over
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*
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* @param
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*
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* @return - return saved keys
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**************************************************************************************************/
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uint8 HalKeyExitSleep ( void )
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{
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/* Wake up and read keys */
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return ( HalKeyRead () );
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}
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/***************************************************************************************************
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* INTERRUPT SERVICE ROUTINE
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***************************************************************************************************/
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/**************************************************************************************************
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* @fn halKeyPort0Isr
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*
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* @brief Port0 ISR
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*
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* @param
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*
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* @return
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**************************************************************************************************/
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HAL_ISR_FUNCTION( halKeyPort0Isr, P0INT_VECTOR )
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{
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HAL_ENTER_ISR();
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if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_6_BIT)
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{
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//halProcessKeyInterrupt();
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osal_set_event(my_TaskID,DEMO_KEYBOARD_2);
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}
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if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_5_BIT)
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{
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//halProcessKeyInterrupt();
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osal_set_event(my_TaskID,DEMO_KEYBOARD_1);
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}
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/*
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Clear the CPU interrupt flag for Port_0
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PxIFG has to be cleared before PxIF
|
|
*/
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|
HAL_KEY_SW_6_PXIFG = 0;
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|
HAL_KEY_CPU_PORT_0_IF = 0;
|
|
|
|
CLEAR_SLEEP_MODE();
|
|
HAL_EXIT_ISR();
|
|
}
|
|
|
|
|
|
/**************************************************************************************************
|
|
* @fn halKeyPort2Isr
|
|
*
|
|
* @brief Port2 ISR
|
|
*
|
|
* @param
|
|
*
|
|
* @return
|
|
**************************************************************************************************/
|
|
HAL_ISR_FUNCTION( halKeyPort2Isr, P2INT_VECTOR )
|
|
{
|
|
HAL_ENTER_ISR();
|
|
|
|
if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT)
|
|
{
|
|
halProcessKeyInterrupt();
|
|
}
|
|
|
|
/*
|
|
Clear the CPU interrupt flag for Port_2
|
|
PxIFG has to be cleared before PxIF
|
|
Notes: P2_1 and P2_2 are debug lines.
|
|
*/
|
|
HAL_KEY_JOY_MOVE_PXIFG = 0;
|
|
HAL_KEY_CPU_PORT_2_IF = 0;
|
|
|
|
CLEAR_SLEEP_MODE();
|
|
HAL_EXIT_ISR();
|
|
}
|
|
|
|
#else
|
|
|
|
|
|
void HalKeyInit(void){}
|
|
void HalKeyConfig(bool interruptEnable, halKeyCBack_t cback){}
|
|
uint8 HalKeyRead(void){ return 0;}
|
|
void HalKeyPoll(void){}
|
|
|
|
#endif /* HAL_KEY */
|
|
|
|
|
|
|
|
|
|
|
|
/**************************************************************************************************
|
|
**************************************************************************************************/
|
|
|
|
|
|
|