Logical Mouse ADNS5020 konstante dx Wert

// include the SPI library: 

#include <SPI.h> 

// setup pins 

int nReset = 48; 

int nCS = 53; 

void setup(){ 

  //set pin I/O direction 

  pinMode (nReset, OUTPUT); 

  pinMode (nCS, OUTPUT); 

  //put the device in reset not chip selected 

  digitalWrite(nReset,LOW);

  digitalWrite(nCS,HIGH); 

  //initialize SPI 

  SPI.begin(); 

  SPI.setDataMode(SPI_MODE3); 

  //start a serial port for debugging 

  Serial.begin(115200); 

  delay(1000); 

  Serial.println("startup complete"); 

} 

void loop(){ 

  unsigned int read_data; 

  delay(1000); 

  //enable ADNS 

  digitalWrite(nReset,HIGH); 

  //startup time 

  delay(1000);

  //read and print a register map 

  Serial.println("ADNS-5020 Register Map"); 

  Serial.println("Addr 0x00 - Data " + String(ADNS_read(0x00))); 

  Serial.println("Addr 0x01 - Data " + String(ADNS_read(0x01))); 

  Serial.println("Addr 0x02 - Data " + String(ADNS_read(0x02))); 

  Serial.println("Addr 0x03 - Data " + String(ADNS_read(0x03))); 

  Serial.println("Addr 0x04 - Data " + String(ADNS_read(0x04))); 

  Serial.println("Addr 0x05 - Data " + String(ADNS_read(0x05))); 

  Serial.println("Addr 0x06 - Data " + String(ADNS_read(0x06))); 

  Serial.println("Addr 0x07 - Data " + String(ADNS_read(0x07))); 

  Serial.println("Addr 0x08 - Data " + String(ADNS_read(0x08))); 

  Serial.println("Addr 0x09 - Data " + String(ADNS_read(0x09))); 

  Serial.println("Addr 0x0A - Data " + String(ADNS_read(0x0A))); 

  delay(1000);   

} 

unsigned int ADNS_read(unsigned int address){ 

  unsigned int data; 

  // take the CS pin low to select the chip: 

  digitalWrite(nCS,LOW); 

  //  send in the address and value via SPI: 

  SPI.transfer(address); 

  pinMode(MOSI, INPUT); 

  data = SPI.transfer(0x00); 

  pinMode(MOSI, OUTPUT); 

  // take the SS pin high to de-select the chip: 

  digitalWrite(nCS,HIGH);  

  return(data); 

}