Pipe1ButtonService.c

/***Service Module to debounce Pipe1 button***/

/*----------------------------- Include Files -----------------------------*/

#include "ES_Configure.h"
#include "ES_Framework.h"
#include "ES_DeferRecall.h"
#include "ES_ShortTimer.h"
#include "LCDService.h"

#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/hw_gpio.h"
#include "inc/hw_sysctl.h"
#include "driverlib/sysctl.h"
#include "driverlib/pin_map.h"	
#include "driverlib/gpio.h"

#include "Pipe1ButtonDebounce.h"

// All_BITS offset variable
#define ALL_BITS (0xff<<2)

// Data Private to Module
static uint8_t LastButtonState;
static uint8_t MyPriority;
static Button1State_t CurrentState;

/**************************************************************
Function: InitPipe1ButtonDB
Takes: 8 bit integer (priority number)
Returns: true or false
Purpose: Passes in priority number, initializes Tiva pins, and moves into state machine.
/*************************************************************/
bool InitPipe1ButtonDB (uint8_t Priority){
	// Store priority value as static variable
	MyPriority = Priority;
	// Initialize port A
	HWREG(SYSCTL_RCGCGPIO) |= SYSCTL_RCGCGPIO_R0 ;
	while((HWREG(SYSCTL_PRGPIO) & SYSCTL_PRGPIO_R0) != SYSCTL_PRGPIO_R0);
	// Initialize bit 5
	HWREG(GPIO_PORTA_BASE+GPIO_O_DEN) |= (GPIO_PIN_5);
	HWREG(GPIO_PORTA_BASE+GPIO_O_DIR) &= (BIT5LO);
	// Sample the button port pin
	LastButtonState = (HWREG(GPIO_PORTA_BASE+(GPIO_O_DATA+ALL_BITS)) & BIT5HI);
	// Set CurrentState to be Debouncing
	CurrentState = Debouncing1;
	// Start debounce timer
	ES_Timer_InitTimer(DB_PIPE1_TIMER,30); // Debounce time of 30 ms
	return true;
}

/**************************************************************
Function: PostStartButtonDB
Takes: ES_Event
Returns: true or false
Purpose: Posts events to this service's queue.
/*************************************************************/
bool PostPipe1Button( ES_Event ThisEvent ){
	return ES_PostToService( MyPriority, ThisEvent);
}

/**************************************************************
Function: CheckPipe1ButtonEvents
Takes: nothing
Returns: true or false
Purpose: Checks the state of the start button and reports it to this service.
/*************************************************************/
bool CheckPipe1ButtonEvents(void){
	// Local Variables
	ES_Event ThisEvent;
	uint8_t ReturnVal = false;
	// Set CurrentButtonState to state read from port pin
	uint8_t CurrentButtonState = (HWREG(GPIO_PORTA_BASE+(GPIO_O_DATA+ALL_BITS)) & BIT5HI);
	if (CurrentButtonState != LastButtonState){
		ReturnVal = true;
		if (CurrentButtonState == BIT5HI){
			// Tell this service the pipe1 button is down
			ThisEvent.EventType = ES_PIPE1_BUTTON_DOWN;
			PostPipe1Button(ThisEvent);
		}
		else{ // button is up
			// Tell this service the pipe1 button is up
			ThisEvent.EventType = ES_PIPE1_BUTTON_UP;
			PostPipe1Button(ThisEvent);
		}
	}
	// Update LastButtonState to CurrentButtonState
	LastButtonState = CurrentButtonState;
	return ReturnVal;
}

/**************************************************************
Function: RunPipe1ButtonDB
Takes: ES_Event
Returns: ES_Event (ES_NO_EVENT)
Purpose: Runs the start button debounce state machine.
/*************************************************************/
ES_Event RunPipe1ButtonDB( ES_Event ThisEvent ){
	if (CurrentState == Debouncing1){
		if ( (ThisEvent.EventType == ES_TIMEOUT) && (ThisEvent.EventParam == DB_PIPE1_TIMER) ){ // 0 is debounce timer number
			// Move into Ready2Sample state
			CurrentState = Ready2Sample1;
		}
	}
	else if (CurrentState == Ready2Sample1){
		if (ThisEvent.EventType == ES_PIPE1_BUTTON_UP){
			// Start debounce timer
			ES_Timer_InitTimer(DB_PIPE1_TIMER,30);
			// Move into debouncing state
			CurrentState = Debouncing1;
		}
		else if (ThisEvent.EventType == ES_PIPE1_BUTTON_DOWN){
			// Start debounce timer
			ES_Timer_InitTimer(DB_PIPE1_TIMER,30);
			CurrentState = Debouncing1;
			// Post DBButtonDown to all queues
			ThisEvent.EventType = ES_PIPE1_BUTTON_DBDOWN;
			ES_PostAll(ThisEvent);
		}
	}
	// Return ES_NO_EVENT
	ThisEvent.EventType = ES_NO_EVENT;
	return ThisEvent;
}