/*****************************************************************************

Name:     configurePins      

Parameters: none                     

Returns:  none      

Description: Checks the analog levels of rs232 pins to decide which are

TXD and RXD pins on each connector.

**************************************************************************** */ 

void configurePins(void)

{

int f2=512;

int f3=512;

int m2=512;

int m3=512;

cables =0;

while (cables==0){

// disable trancievers

DDR_ENFA = 1;

DDR_ENFB = 1;

DDR_ENMA = 1;

DDR_ENMB = 1;

ENFA = FALSE;

ENFB = FALSE;

ENMA = FALSE;

ENMB = FALSE;

//setup ADC

adcon0 = 0x90;

      /*

        10010000;  ** Repeat sweep mode 0, soft trigger, fAD/2

    ||||||||______Analog input select bit 0

    |||||||_______Analog input select bit 1

    ||||||________Analog input select bit 2

    |||||_________A/D operation mode select bit 0

    ||||__________A/D operation mode select bit 1

    |||___________Trigger select bit

    ||____________A/D conversion start flag

    |_____________Frequency select bit 0 */

adcon1 = 0x3A;

      /*

      00111010; ** Scan AN0-AN%, 10-bit mode, fAD/2, Vref connected

    ||||||||______A/D sweep pin select bit 0

    |||||||_______A/D sweep pin select bit 1

    ||||||________A/D operation mode select bit 1

    |||||_________8/10 bit mode select bit

    ||||__________Frequency select bit 1

    |||___________Vref connect bit

    ||____________External op-amp connection mode bit 0

    |_____________External op-amp connection mode bit 1 */   

adcon2 = 0x01;

      /*

      00000001; ** Sample and hold enabled, fAD/2

    ||||||||______AD conversion method select bit

            |||||||_______AD input group select bit 0

      ||||||________AD input group select bit 1

      |||||_________Reserved

      ||||__________Frequency select bit 2

      |||___________Reserved

      ||____________Reserved

      |_____________Reserved */

    adst = 1; // Start a conversion here

    while (adst); // wait for conversions to be done.

 

f2= AN_F2 & 0x03ff; // Mask off the upper 6 bits of the 

// variable leaving only the result

// in the variable itself

f3= AN_F3 & 0x03ff; // Mask off the upper 6 bits of the 

// variable leaving only the result

// in the variable itself

m2= AN_M2 & 0x03ff; // Mask off the upper 6 bits of the 

// variable leaving only the result

// in the variable itself

m3= AN_M3 & 0x03ff; // Mask off the upper 6 bits of the 

// variable leaving only the result

// in the variable itself

// enable correct trancievers by looking for negative voltages

if (f2>VOLTAGE_232){ // 573 = ((-3V/-10 + 2.5V)/ 5V )* 1023 

DisplayString(LCD_LINE2 ,"DB9F    ");

ENFA = TRUE;

ENFB = FALSE;

VoltageF = (f2-512) ;

}else if  (f3>VOLTAGE_232){

DisplayString(LCD_LINE2 ,"DB9F Xvr");

ENFA = FALSE;

ENFB = TRUE;

VoltageF = (f3-512);

}else{ // no DB9F Detected

//DisplayString(LCD_LINE2 ,"No DB9F ");

}

if (m2>VOLTAGE_232){

DisplayString(LCD_LINE1, "DB9M    ");

ENMA = FALSE;

ENMB = TRUE;

VoltageM = (m2-512) ;

}else if (m3>VOLTAGE_232){

DisplayString(LCD_LINE1, "DB9M Xvr");

ENMA = TRUE;

ENMB = FALSE;

VoltageM = (m3-512) ;

}else{ // no DB9M Detected

//DisplayString(LCD_LINE1, "No DB9M ");

}

// check number of cables and setup interrupts accordingly.

cables = (char) (ENFA + ENFB + ENMA + ENMB);

switch (cables){

case 0:

DisplayString(LCD_LINE1 ,"No cable");

DisplayString(LCD_LINE2, "detected");

int_init(0);

break;

case 1:

if (ENFA+ENFB){ // DB9F

int_init(2);

}else{ // DB9M

int_init(1);

}

break;

case 2:

int_init(2); // DB9F by default

break;

}

}

// while(!S2);

}