Hi
I am using a pic16f690, mplab and hitech compiler for a program in C.
Practically I have an input voltage value (coming from a light to voltage converter or even from other sources of tension), connected to RA0/AN0, and PORTC connected to a 7segments display and another 7segments display connected to PORTB and the last to output of PORTA.
What I need to do is to visualize the input voltage on the 2 display.
I am perfectly capable to use the 2 display to visualize the values I want on them but not the input voltage value.
(if I send void set7segB(5); then I see a 5).
The register of the ADC input in the 16f690 is based on 10 bits( either 2 on ADRESH and 8 on ADRESL, or the other way around).
Idependently from the input (even if I connect 5V or 2V direct to AN0 from a supplier) I see on the display alway two "8". Where is the mistake ?
I am using an adpted version of the Gooligum Electronics tutorial.
Please Help me
Code:
I am using a pic16f690, mplab and hitech compiler for a program in C.
Practically I have an input voltage value (coming from a light to voltage converter or even from other sources of tension), connected to RA0/AN0, and PORTC connected to a 7segments display and another 7segments display connected to PORTB and the last to output of PORTA.
What I need to do is to visualize the input voltage on the 2 display.
I am perfectly capable to use the 2 display to visualize the values I want on them but not the input voltage value.
(if I send void set7segB(5); then I see a 5).
The register of the ADC input in the 16f690 is based on 10 bits( either 2 on ADRESH and 8 on ADRESL, or the other way around).
Idependently from the input (even if I connect 5V or 2V direct to AN0 from a supplier) I see on the display alway two "8". Where is the mistake ?
I am using an adpted version of the Gooligum Electronics tutorial.
Please Help me
Code:
Code:
#include
__CONFIG(MCLREN & UNPROTECT & WDTDIS & INTIO);
void set7segC(char digit); // display digit on 7-segment display
void set7segB(char digit); // display digit on 7-segment display
void main()
{
unsigned int adc_dec; // scaled ADC output (0-99)
// configure ports
TRISA = 0b11001011;
ANSEL = 0b00000001;
ANSELH = 0b00000001;
TRISB = 0b00000000; // configure PORTB as outputs
TRISC = 0b00000000; // configure PORTC as outputs
CM1CON0 = 0; // disable comparator 1 (RB0, RB1, RB2 usable)
CM2CON0 = 0; // disable comparator 2 (RC0, RC1, RC4 usable)
VRCON = 0; // disable CVref (RC2 usable)
// configure ADC
ADCON0 = 0b10000011;
//1------ Right justified
//-0------ VDD
//--0000-- Set AN0 as the input
//-------11 turn ADC on (ADON = 1)
ADCON1 = 0b00110000;
// Main loop
for (;;)
{
// sample input
GODONE = 1; // start conversion
while (GODONE); // wait until done
// scale result to 0-99
adc_dec = (ADRESL + (ADRESH << 8)) * 99/1024;
set7segC(adc_dec%10); // output ones digit of result on segment bus
set7segB(adc_dec/10); // output tens digit of result on segment bus
}
}
/***** FUNCTIONS *****/
void set7segC(char digit)
{
// Lookup pattern table for 7-segment display on ports B and C
const char pat7seg[10] =
{
0b0111111, // 0
0b0011000, // 1
0b1110110, // 2
0b1111100, // 3
0b1011001, // 4
0b1101101, // 5
0b1101111, // 6
0b0111000, // 7
0b1111111, // 8
0b1111101 // 9
};
PORTC = pat7seg[digit] ;
}
void set7segB(char digit)
{
// Lookup pattern table for 7-segment display on ports B and C
const char pat7seg[10] =
{
0b0111111, // 0
0b0011000, // 1
0b1110110, // 2
0b1111100, // 3
0b1011001, // 4
0b1101101, // 5
0b1101111, // 6
0b0111000, // 7
0b1111111, // 8
0b1111101 // 9
};
PORTB = pat7seg[digit] ;
PORTA = pat7seg[digit] & 1100000;
}