pic16f877 adc programming

[bluemonday]

hi.. im programmed my adc using mikroC. the program is:

unsigned int adc_value;

void main() {
ADCON1 = 0x80; // Configure analog inputs and Vref
TRISA = 0xFF; // PORTA is input
TRISB = 0x3F; // Pins RB7, RB6 are outputs

Usart_Init(115000);

do {
adc_value = Adc_Read(2); // Get results of AD conversion
Usart_Write(adc_value);
Delay_us(200);
} while(1);
}

my project is an oscillscope.. my problem now is that at frequencies more than 10Hz the wave displayed in my PC software is distorted.. im using USB as an interface. can anyone tell me whats wrong with my program.. my knowledge is limited in PIC programming. can anyone show me how to program the microcontroller using interrupts? im using 256000 baud rate.. please help me..[/youtube]

 

[psmll]

This is normal

For example when I think in a oscilloscope with 18f458, after some calcs from data in the datasheet I saw that you can only get a +-30KS/s

Exist some 18F that can do +-200KS/s but is still a lower value!

EDIT:

Well I didn't saw the "10Hz", I tough it was 10KHz.
If the signal is 10Hz then you have a problem.