Interfacing with ADNS-7550

Using Arduino Networking, Protocols, and Devices
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Hi. Iv used arduino a long time now and i absolutely love it. Made alot of projects but never got real deep into communication protocols and now im trying to interface with ADNS-7550 chip.

i tried reading the datasheet and the reference on this page

But i only get confused :S
if i could get some pointers on how setup and use the correct spi commands to send and receive i would be veary grateful :slight_smile:

i havnt used spi alot myselfe, but if i just could get all the values right in the library one time and maybe send a command and receive a command i think i can get the rest by trial and failure :slight_smile:

i just blew 1 arduino mega on this and i rather not destroy one more :S

Thanks alot in advance :slight_smile:

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Iv read it and i stil dont understand, i have no experience with spi and how to make read or write. like in the datasheet it says "Write 0x5a to register 0x3a" i havnt got a clue, im sorry :confused:

4

Trying this on my own with a arduino mega :roll_eyes:

#include "SPI.h"#

int ss = 53;



void setup() {

  Serial.begin(115200);
  pinMode(ss, OUTPUT);
  SPI.begin();
  SPI.setBitOrder(MSBFIRST);
  digitalWrite(ss,HIGH);
  delayMicroseconds(10);
  digitalWrite(ss,LOW);
  delayMicroseconds(10);
  spiWrite(0x5a,0x3a);
  delayMicroseconds(10);
  digitalWrite(ss,HIGH);
  delayMicroseconds(10);
  digitalWrite(ss,LOW);
  spiWrite(0x5a,0x3a);
  int a = SPI.transfer(0x02);
  a = SPI.transfer(0x03);
  a = SPI.transfer(0x04);
  a = SPI.transfer(0x05);
  delayMicroseconds(10);
  spiWrite(0x27,0x3c);
  spiWrite(0x0a,0x22);
  spiWrite(0x01,0x21);
  spiWrite(0x32,0x3c);
  spiWrite(0x20,0x23);
  spiWrite(0x05,0x3c);
  spiWrite(0xb9,0x37);
  delay(1000);
  a = SPI.transfer(0x03);
  Serial.println(a);
  delay(50);
  a = SPI.transfer(0x03);
  Serial.println(a);
  a = SPI.transfer(0x03);
  Serial.println(a);
  a = SPI.transfer(0x03);
  Serial.println(a);
  a = SPI.transfer(0x03);
  Serial.println(a);
  
  
  
  
  

}

void loop() {


}

int spiWrite(int address, int value) {
  // take the SS pin low to select the chip:
  digitalWrite(ss,LOW);
  //  send in the address and value via SPI:
  SPI.transfer(address);
  SPI.transfer(value);
  // take the SS pin high to de-select the chip:
  digitalWrite(ss,HIGH); 
  delayMicroseconds(10);
}
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