sahu
Advanced Member level 2
- Joined
- Oct 9, 2009
- Messages
- 519
- Helped
- 68
- Reputation
- 130
- Reaction score
- 63
- Trophy points
- 1,308
- Location
- Uttar pradesh (INDIA)
- Activity points
- 3,927
i have need read more then 1 adc with 16f676,but no left adc pin on this code .if i use 7447 BCD to 7 Segment driver IC .then it possible with this code .
we can use 7447 BCD to 7 Segment driver IC with 16f676 as
PHP:
#include <htc.h>
__CONFIG (FOSC_INTRCIO & MCLRE_OFF & BOREN_ON & CP_OFF & CPD_OFF & WDTE_OFF & PWRTE_ON );
#define SPORT PORTA
#define DPORT PORTC
const char SegCode[11] ={0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xFF};// {0x40,0x57,0x22,0x06,0x15,0x0C,0x08,0x56,0x00,0x04,0xFF};
// 0 1 2 3 4 5 6 7 8 9
const char Column[3] = {0x02,0x01,0x04};
static char Segment[3] = {0x7f,0x7f,0x7f};
static unsigned char ColCount=0x00;
void CPU_SETUP(void);
void Display(void);
void HTO7S(unsigned int Num);
void delayMs(int x);
unsigned int result;
unsigned int readAdc(void);
void interrupt timer1_isr(void)
{
if(PIR1bits.TMR1IF==1)
{
PIR1bits.TMR1IF = 0;
TMR1H=0xDF;
Display();
}
}
void main()
{
unsigned char i;
CPU_SETUP();
while(1)
{
result=0;
for (i=0;i<3;i++)
{
delayMs(1);
result=result+readAdc();
}
HTO7S(result/3);
delayMs(200);
}
}
void CPU_SETUP()
{
CMCON =0x07; //Turn off comparator module
ANSEL =0x8; //AN3 as analog input
ADCON1 =0x60; //clock/64
ADCON0 = 0x8D;
TRISA=0b00011000;
PORTA=0x27;
TRISC=0b00000000;
PORTC=0x37;
T1CON= 0x00;
TMR1H=0xDF;
INTCONbits.GIE =1;
INTCONbits.PEIE=1;
PIE1bits.TMR1IE =1;
T1CONbits.TMR1ON=1;
}
unsigned int readAdc()
{
unsigned int res;
ADCON0bits.GO_DONE =1;
while(ADCON0bits.GO_DONE ==1);
res=ADRESL+(ADRESH*0x100);
return(res);
}
//-------------------------------------
// Display routine
//-------------------------------------
void Display()
{
PORTA = 0b00100111; // off all digits column and Segment G
PORTC = 0b00111111; // off segment a-f
if (ColCount>=3)
ColCount=0;
DPORT = Segment[ColCount];
SPORT = ((Segment[ColCount] & 0b01000000)>>1) | (Column[ColCount]^0x07);
ColCount++;
}
//--------------------------------------
// Convet HEX 2 byte to 7-Segment code
//--------------------------------------
void HTO7S(unsigned int Num)
{
unsigned int res;
res = ((30*Num)%1023)/100;
if(res==10)
{
Num=Num+1;
res=0;
}
Segment[2]=SegCode[res];
res = (30*Num)/1023;
Segment[1]=SegCode[res%10];
Segment[0]=SegCode[res/10];
if (Segment[0]==0x40)
Segment[0]=0xFF;
}
void delayMs(int x)
{
int i;
for (x ;x>0;x--)
{
for (i=0;i<=110;i++);
}
}
PHP:
_______
vdd | 1 14 | Vss
DIGIT_1000 <-- RA5 | 2 13 | AN0 <-- ADC0
DIGIT_100 <-- RA4 | 3 12 | AN1 <-- ADC1
MCLR | 4 11 | AN2 <-- ADC2
DIGIT_10 <-- RC5 | 5 10 | RC0 --> A
DIGIT_0 <-- RC4 | 6 9 | RC1 --> B
D <-- RC3 | 7 8 | RC2 --> C
_______