Microchip MPLAB Drehrichtungsabfrage + Shift

#include <pic.h>


//----------------------CONFIGURE DEVICE--------------------

__CONFIG(INTIO & WDTDIS & PWRTDIS & MCLRDIS &
UNPROTECT & BORDIS & IESODIS & FCMDIS);

//-----------------------DATA MEMORY------------------------


unsigned char LED_Output;//Variable used to set/clear PORTC bits


//----------------------PROGRAM MEMORY----------------------
unsigned char LED_Output;//Variable used to set/clear PORTC bits

/** PRIVATE PROTOTYPES *********************************************/
void Initialize(void);
void Get_Inputs(void);
void Decide(void);
void Do_Outputs(void);
void Timing(void);





/**SUPPORT ROUTINES****************************************** *******/


/*---------------------------------------------------------
Subroutine: Delay_1S
Parameters: none
Returns:nothing
Synopsis:Creates a 1S delay when called
---------------------------------------------------------*/
void Delay_1S(void)
{
//Create an 8-bit variable called counter
//and initialize it to 0
unsigned char counter = 0;
while(counter <= 3)
{
//Make sure the T0IF is cleared
T0IF = 0;
//Clear the TMR0 register
TMR0 = 0;
//Sit here and wait for Timer0 to overflow
while (T0IF == 0);
++counter;
}
}

/**INTERRUPT CODE********************************************** ***/




/**SOFTWARE CONTROL LOOP CODE*************************************/
/*----------------------------------------------------------
Subroutine: main
Parameters: none
Returns: nothing
Synopsys: Main program function
-----------------------------------------------------------*/
void main(void)
{

Initialize(); //Initialize the relevant registers
while(1)
{
Decide(); //Make any decisions
Do_Outputs(); //Perform any outputs
Timing();//Sets execution rate of the
//Software Control Loop
}


}

/*----------------------------------------------------------
Subroutine: INITIALIZE
Parameters: none
Returns: nothing
Synopsys: Initializes all registers
associated with the application by calling
initialization functions for each peripheral
----------------------------------------------------------*/
void Initialize(void)
{
//Clear PORTC to a known state
PORTC = 0b00010001;
//Configure PORTC's ANALOG/DIGITAL pins as all Digital
ANS4 = 0;//Associated with RC0
ANS5 = 0;//Associated with RC1
ANS6 = 0;//Associated with RC2
ANS7 = 0;//Associated with RC3
ANS8 = 0;//Associated with RC6
ANS9 = 0;//Associated with RC7
//Configure PORTC pins as all output
//i.e. 1 = Input, 0 = Output
TRISC0 = 0;//Associated with RC0
TRISC1 = 0;//Associated with RC1
TRISC2 = 0;//Associated with RC2
TRISC3 = 0;//Associated with RC3
TRISC4 = 0;//Associated with RC4
TRISC5 = 0;//Associated with RC5
TRISC6 = 0;//Associated with RC6
TRISC7 = 0;//Associated with RC7
//Configure Timer0 as follows:
T0CS = 0; //Use the internal instruction clock
//FOSC/4 as the clock source
T0SE = 0;//Increment TMR0 on low-to-high
//FOSC/4 transition
PSA = 0;//Assign the prescaler to
//Timer0
//Configure Timer0 prescaler to increment
//TMR0 every 256 FOSC/4 clock transitions
PS0 = 1;
PS1 = 1;
PS2 = 1;
//Initialize LED_Output to all zeros
LED_Output = 0b00001000;
}

/*----------------------------------------------------------
Subroutine: Get_Inputs
Parameters: none
Returns: nothing
Synopsys: Obtains all off-chip inputs
----------------------------------------------------------*/
void Get_Inputs(void)
{
//ADD GET INPUTS CODE HERE
}

/*----------------------------------------------------------
Subroutine: Decide
Parameters: none
Returns: nothing
Synopsys: Function that calls all sub-routines for
processing the input data
----------------------------------------------------------*/
void Decide(void)
{
//First check if LED_Output variable has most significant bit
//set to 1 or if LED_Output variable is all 0's.
//If so, re initialize the LED_Output variable so that the
//least significant bit is set to 1 and all other bits are
//cleared to 0
if((LED_Output == 0b10001000) || (LED_Output == 0b00010000))
LED_Output = 0b00010001;
//If neither of these conditions are true, simply shift
//the LED_Output variable's contents to the Left by 1 bit
//position
else LED_Output <<=1;
}

/*----------------------------------------------------------
Subroutine: Do_Outputs
Parameters: none
Returns: nothing
Synopsys: Ouputs to off-chip circuitry based off of
Decide function
----------------------------------------------------------*/
void Do_Outputs(void)
{
//Assign the manipulated contents of the
//LED_Output variable to the PORTC register
PORTC = LED_Output;
}
/*----------------------------------------------------------
Subroutine: Timing
Parameters: none
Returns: nothing
Synopsys: Controls the how fast code in the main() is executed
----------------------------------------------------------*/
void Timing(void)
{
Delay_1S(); //Call the 1 second delay
}