Trouble setting ADC to fully respond - css

Question

I have made a simple program that controls a 10-LED bar graph and the speed in which the LEDs change is supposed to be controlled by a 10K POT. I am using 16F88 (and CSS Compiler/Mplab v8.91) for this simple Program, but the 10k POT is not responding to a full turn of the POT. Only toward in the Last 5% of MAX on the POT, does the speed change a few steps. From Minimum to 95% (of MAX) there is no change in the speed of output of the LEDs.
All other parts of the code with. Just need to get this POT figured out.
Thanks in Advance!
#include <16f88.h>
#device ADC=10
#device *=16
#ZERO_RAM
//////// Fuses: LP,XT,HS,EC_IO,NOWDT,WDT,NOPUT,PUT,MCLR,NOMCLR,BROWNOUT
//////// Fuses: NOBROWNOUT,LVP,NOLVP,CPD,NOCPD,WRT,NOWRT,DEBUG,NODEBUG,CCPB0
//////// Fuses: CCPB3,PROTECT,NOPROTECT,INTRC,INTRC_IO,RC,RC_IO,FCMEN
//////// Fuses: NOFCMEN,IESO,NOIESO
#fuses INTRC_IO,NOWDT,PUT, NOMCLR, PROTECT, NOBROWNOUT, NOLVP, NOWRT, NOCPD
#use delay(clock=4000000)
#use fast_io(A)
#use fast_io(B)
#byte PORTA = 0x5
#byte PORTB = 0x6
/**********************************************************************/
/* PIC interface */
/**********************************************************************/
#bit LED1 = PORTA.1 //Output
#bit LED2 = PORTA.2
#bit LED3 = PORTA.3
#bit LED4 = PORTA.4
#bit LED5 = PORTA.6
#bit LED6 = PORTA.7
#bit LED7 = PORTB.0
#bit LED8 = PORTB.1
#bit LED9 = PORTB.2
#bit LED10 = PORTB.3
#bit LED_GREEN = PORTB.4
#bit SP_OUT = PORTB.5 //Short Pulse
/**************************************************************************
* Global Variables
**************************************************************************/
int speed, state, adc0;
unsigned int16 t,t1, t2,t3, t4;
short flag, flag1,flag2;
/**************************************************************************
* Speed
**************************************************************************/
void f_speed(void) {
SET_ADC_CHANNEL(0);
delay_us(100);
adc0 = READ_ADC();
if(adc0<1) adc0=1;
if(adc0>0 && adc0<=32)
t2=2800; //280ms
if(adc0>32 && adc0<=64)
t2=2450;; //245ms
if(adc0>64 && adc0<=96)
t2=2100; //210ms
if(adc0>96 && adc0<=128)
t2=1750;
if(adc0>128 && adc0<=160)
t2=1400;
if(adc0>160 && adc0<=192)
t2=1050;
if(adc0>192 && adc0<=224)
t2=700;
if(adc0>224 && adc0<=256)
t2=350; //35ms
}
/**************************************************************************
* Mode 1 basic Scan
**************************************************************************/
void f_mode_1(void) {
// SPM_BASIC_SCAN
if(flag1){
flag1=0;
flag2=1;
t=0;
}
if(flag2){
if(t>10){
SP_OUT=1;
flag2=0;
t4=0;
}
}
switch(state){
case 1:
// PORTA = 0b00000001; // SCAN STARTS
LED1=1;
if(t3>t2){
t3=0;
state=2;
LED1=0;
}
break;
case 2:
LED2=1;
if(t3>t2){
t3=0;
state=3;
LED2=0;
}
break;
case 3:
LED3=1;
if(t3>t2){
t3=0;
state=4;
LED3=0;
}
break;
case 4:
LED4=1;
if(t3>t2){
t3=0;
state=5;
LED4=0;
}
break;
case 5:
LED5=1;
if(t3>t2){
t3=0;
state=6;
LED5=0;
}
break;
case 6:
LED6=1;
if(t3>t2){
t3=0;
state=7;
LED6=0;
}
break;
case 7:
LED7=1;
if(t3>t2){
t3=0;
state=8;
LED7=0;
}
break;
case 8:
LED8=1;
if(t3>t2){
t3=0;
state=9;
LED8=0;
}
break;
case 9:
LED9=1;
if(t3>t2){
t3=0;
state=10;
LED9=0;
}
break;
case 10:
LED10=1;
if(t3>t2){
t3=0;
state=11;
LED10=0;
}
break;
case 11:
LED9=1;
if(t3>t2){
t3=0;
state=12;
LED9=0;
}
break;
case 12:
LED8=1;
if(t3>t2){
t3=0;
state=13;
LED8=0;
}
break;
case 13:
LED7=1;
if(t3>t2){
t3=0;
state=14;
LED7=0;
}
break;
case 14:
LED6=1;
if(t3>t2){
t3=0;
state=15;
LED6=0;
}
break;
case 15:
LED5=1;
if(t3>t2){
t3=0;
state=16;
LED5=0;
}
break;
case 16:
LED4=1;
if(t3>t2){
t3=0;
state=17;
LED4=0;
}
break;
case 17:
LED3=1;
if(t3>t2){
t3=0;
state=18;
LED3=0;
}
break;
case 18:
LED2=1;
if(t3>t2){
t3=0;
state=1;
LED2=0;
}
break;
}
}
/**************************************************************************
* Clear_LED
**************************************************************************/
void Clear_LED(void){
LED1=0;
LED2=0;
LED3=0;
LED4=0;
LED5=0;
LED6=0;
LED7=0;
LED8=0;
LED9=0;
LED10=0;
}
/*************************************************************************
* timer0 Interrupts 100useg
**************************************************************************/
#INT_TIMER0
void TIMER0_isr()
{
set_timer0(156);
t3++; // Speed timer
t4++; //Short pulse timer
if(t4>5000) {
t4=0; //500ms
SP_OUT = 0;
}
}
/*************************************************************************
* timer1 Interrupts 100ms
**************************************************************************/
#INT_TIMER1
void TIMER1_isr()
{
set_timer1(53036);
t++;
t1++;
}
/**************************************************************************
* interruption for change RB4-RB7
**************************************************************************/
#int_rb
void detect_rb_change(void) {
disable_interrupts(INT_RB);
int current;
static int last=0;
current=PORTB;
if ((!bit_test(current,7))&&(bit_test(last,7))) {
flag=!flag;
if(flag){ //ON
LED_GREEN=1;
state=1;
t3=0;
f_speed();
flag1=1;
} else{ //OFF
LED_GREEN=0;
}
}
last=current;
enable_interrupts(INT_RB);
}
/**************************************************************************
* Main Progran
**************************************************************************/
void main()
{
set_tris_a(0x00);
set_tris_b(0x80);
setup_adc_ports(sAN0);
setup_adc(VSS_VDD | ADC_CLOCK_DIV_8);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);
setup_timer_0(T0_INTERNAL|T0_DIV_0);
Clear_LED();
LED_GREEN=0;
SP_OUT=0;
flag=false;
state=1;
f_speed();
t3=0;
t1=0;
set_timer1(53036); //Interrupts 100ms
set_timer0(156); //Interrupts 100us
enable_interrupts(INT_TIMER0);
enable_interrupts(INT_RB);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
while(1)
{
if(flag){ //ON
if(t1>10){
t1=0;
f_speed();
}
f_mode_1();
} else{
Clear_LED();
}
}
}