LCDService.c

/***Service module that implements a state machine for writing individual characters and commands to LCD***/

/*----------------------------- 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 "SR_for_LCD.h"
#include "LCDmod.h"
#include "LCDService.h"

/*---------------------------- Module Variables ---------------------------*/
static uint8_t MyPriority;
static LCDState_t CurrentState = InitPState;
static uint8_t InitCounter = 0;
static uint8_t CharToPut;

/**************************************************************
Function: InitLCDService
Takes: 8 bit integer (priority number)
Returns: true or false
Purpose: Stores priority number of this service inside the module and puts state machine into initial pseudo-state.
/*************************************************************/
bool InitLCDService ( uint8_t Priority )
{
	ES_Event ThisEvent;
	// Store priority number in a stati variable
	MyPriority = Priority;
	// Put us into the initial pseudo-state to set up for the initial transition
	CurrentState = InitPState;
	// Set up the short timer for inter-command timings
	ES_ShortTimerInit(MyPriority, SHORT_TIMER_UNUSED );
	// Post the initial transition event
	ThisEvent.EventType = ES_INIT;
	if (ES_PostToService( MyPriority, ThisEvent) == true){  
		return true;
	}
	else{
		return false;
	}
}

/**************************************************************
Function: PostLCDService
Takes: ES_Event
Returns: true or false
Purpose: Posts ES_Event to LCDService queue.
/*************************************************************/
bool PostLCDService( ES_Event ThisEvent )
{
  return ES_PostToService( MyPriority, ThisEvent);
}

/**************************************************************
Function: RunLCDService
Takes: ES_Event
Returns: ES_Event (ES_NO_EVENT)
Purpose: Runs the LCDService state machine.
/*************************************************************/
ES_Event RunLCDService( ES_Event ThisEvent )
{ 
  ES_Event ReturnEvent;
  ReturnEvent.EventType = ES_NO_EVENT; // assume no errors
  // Switch 
  switch (CurrentState){
    case InitPState :
      if ( ThisEvent.EventType == ES_INIT ){
		// Initialize the necessary Tiva pins
		LCD_HWInit();
		// Increment initialization counter
		InitCounter++;
		// Start the timer for max short timer delay
		ES_ShortTimerStart(TIMER_A, 65535);
		// move to the Initializing state
		CurrentState = Initializing ;
      }
      break;
    case Initializing :
      if( ThisEvent.EventType == ES_SHORT_TIMEOUT ){
		// Take appropriate initialization step, then set short timer to delay
		if (InitCounter==1){
			LCD_WriteCommand4(0x2);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==2){
			LCD_WriteCommand4(0x2);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==3){
			LCD_WriteCommand4(0x2);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==4){
			LCD_WriteCommand4(0x8);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==5){
			LCD_WriteCommand8(0x08);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==6){
			LCD_WriteCommand8(0x01);
			ES_ShortTimerStart(TIMER_A, 4500); 
		}
		else if (InitCounter==7){
			LCD_WriteCommand8(0x06);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==8){
			LCD_WriteCommand8(0x0f);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==9){
			LCD_WriteCommand8(0x80);
			ES_ShortTimerStart(TIMER_A, 450);
		}
		else if (InitCounter==10){
			CurrentState = Waiting2Write;
		}
		// Increment initialization counter
		InitCounter++;
		}
		break;
    case Waiting2Write : 
		if (ThisEvent.EventType == ES_LCD_PUTCHAR ){
			// Write character to LCD
			LCD_WriteData8(ThisEvent.EventParam) ;	
			// Start the inter-character timer (Inter char delay = 53 us)
			ES_ShortTimerStart(TIMER_A,53);
			// Move to the PausingBetweenWrites state
			CurrentState = PausingBetweenWrites;
		}			
		else if (ThisEvent.EventType==ES_LCD_COMMAND) {
			// Write command to LCD
			LCD_WriteCommand8(ThisEvent.EventParam);
			// Start the inter-command timer
			ES_ShortTimerStart(TIMER_A,53);
			// Move to the PausingBetweenWrites state
			CurrentState = PausingBetweenWrites;
		}
		else if (ThisEvent.EventType==ES_LCD_RESET){
			// Move to initializing state
			CurrentState = Initializing;
			// Reset initialization counter to 1
			InitCounter = 1;
			// Delay 4500 us before taking first initialization step
			ES_ShortTimerStart(TIMER_A, 4500);
		}
		break;
    case PausingBetweenWrites :
		if( ThisEvent.EventType == ES_SHORT_TIMEOUT ){
			// Move to Waiting2Write state
			CurrentState = Waiting2Write;
		}
		else if (ThisEvent.EventType==ES_LCD_RESET){
			// Move to initializing state
			CurrentState = Initializing;
			// Reset initialization counter to 1
			InitCounter = 1;
			// Delay 4500 us before taking first initialization step
			ES_ShortTimerStart(TIMER_A, 4500);
		}
		break;
	}
	// Return ES_NO_EVENT
	return ReturnEvent;
}