prescale for digital input clock

Projects Programming
1

Hi,

I'm trying to read in a digital signal with a clock speed of 2.1168MHz (using an Ardoino UNO r3). First I just want to forward that signal to another output pin. Shotly before I thought that there wouldn't be a possibility (after measuring a samplerate of ~125kHz) I found this forum post:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1208715493/11
Ok, they are changing the pre scale value for the analog inputs, but how can I achieve a higher digital sampling rate?
Later on I found articles about changing the prescale value of timers, but this does't affect my sampling rate at all. What am I doing wrong? Or is it possible to mess up with my clock speed in general?
My current code looks like this:

// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

void setup(){
  
  // set analog prescale to 2
  cbi(ADCSRA,ADPS2) ;
  cbi(ADCSRA,ADPS1) ;
  cbi(ADCSRA,ADPS0) ;
  
  //set timer1 prescale to clk/1, no prescaling
  TCCR1B = 0x01;
  
  DDRB = DDRB | B011011;
  PORTB = B000000;
}

void loop(){
  PORTB = (PINB & B000100) >> 1;
}

I hope someone can help me,
many greetings from germany
Jan

2

many greetings from germany

Greetings from Dallas!

I'm trying to read in a digital signal with a clock speed of 2.1168MHz (using an Ardoino UNO r3).

According to Nyquist, that signal has to be sampled at 4.2336 MHz. The processor's clock is running at 16 MHz. We'll assume every machine instruction takes exactly one cycle to execute. That means you have to read the signal and process it with just three machine instructions. You are trying to install blind rivets using a jackhammer. In other words, you need a different tool.