I realize this isn’t a component that SF sells, but it’s the replacement for the 2620 and the code is pretty close though, maddeningly, different enough that I can’t get it to work 
Thought I’d post this up here and see if anyone might see what could be wrong with it. The datasheet is here: http://www.avagotech.com/pages/en/navig … adns-5050/ and I’m following a combination of the Arduino2620 code and some atMega328 code that I found online. Since I’m working with an Uno at the moment I figured that the 328 code should be easy to convert over. So far no love though. Here’s what I’ve got:
#define SCLK 5
#define SDIO 3
#define PRODUCT_ID 0x00
#define PRODUCTID2 0x3e
#define REVISION_ID 0x01
#define DELTA_Y_REG 0x03
#define DELTA_X_REG 0x04
#define SQUAL_REG 0x05
#define MAXIMUM_PIXEL_REG 0x08
#define MINIMUM_PIXEL_REG 0x0a
#define PIXEL_SUM_REG 0x09
#define PIXEL_DATA_REG 0x0b
#define SHUTTER_UPPER_REG 0x06
#define SHUTTER_LOWER_REG 0x07
#define RESET 0x3a
#define CPI500v 0x00
#define CPI1000v 0x01
const int NCS = 4;
void setup()
{
Serial.begin(57600);
pinMode(SDIO, OUTPUT);
pinMode(SCLK, OUTPUT);
pinMode(NCS, OUTPUT);
digitalWrite(NCS, LOW);
delayMicroseconds(2);
digitalWrite(NCS, HIGH);
//call reset
ADNS_write(RESET, 0x5a);
delay(50); // From NRESET pull high to valid mo tion, assuming VDD and motion is present.
}
void loop()
{
delay(200);
Serial.println(ADNS_read(PRODUCT_ID), BIN); // should print 00010010, doesn't
}
void ADNS_write(unsigned char addr, unsigned char data) {
char temp;
int n;
digitalWrite(NCS, LOW);//nADNSCS = 0; // select the chip
temp = addr;
digitalWrite(SCLK, LOW);//SCK = 0; // start clock low
pinMode(SDIO, OUTPUT);//DATA_OUT; // set data line for output
for (n=0; n<8; n++) {
digitalWrite(SCLK, LOW);//SCK = 0;
pinMode(SDIO, OUTPUT);
delayMicroseconds(1);
if (temp & 0x80)
digitalWrite(SDIO, HIGH);//SDOUT = 1;
else
digitalWrite(SDIO, LOW);//SDOUT = 0;
temp = (temp << 1);
digitalWrite(SCLK, HIGH);//SCK = 1;
delayMicroseconds(1);//delayMicroseconds(1); // short clock pulse
}
temp = data;
for (n=0; n<8; n++) {
digitalWrite(SCLK, LOW);//SCK = 0;
delayMicroseconds(1);
if (temp & 0x80)
digitalWrite(SDIO, HIGH);//SDOUT = 1;
else
digitalWrite(SDIO, LOW);//SDOUT = 0;
temp = (temp << 1);
digitalWrite(SCLK, HIGH);//SCK = 1;
delayMicroseconds(1); // short clock pulse
}
delayMicroseconds(20);
digitalWrite(NCS, HIGH);//nADNSCS = 1; // de-select the chip
}
byte ADNS_read(unsigned char addr) {
byte temp;
int n;
digitalWrite(NCS, LOW);//nADNSCS = 0; // select the chip
temp = addr;
digitalWrite(SCLK, OUTPUT); //SCK = 0; // start clock low
pinMode(SDIO, OUTPUT); //DATA_OUT; // set data line for output
for (n=0; n<8; n++) {
digitalWrite(SCLK, LOW);//SCK = 0;
pinMode(SDIO, OUTPUT); //DATA_OUT;
if (temp & 0x80) {
digitalWrite(SDIO, HIGH);//SDOUT = 1;
}
else {
digitalWrite(SDIO, LOW);//SDOUT = 0;
}
temp = (temp << 1);
delayMicroseconds(1);
digitalWrite(SCLK, HIGH); //SCK = 1;
delayMicroseconds(1); // short clock pulse
}
temp = 0; // This is a read, switch to input
pinMode(SDIO, INPUT); //DATA_IN;
delayMicroseconds(4);
for (n=0; n<8; n++) { // read back the data
digitalWrite(SCLK, LOW); //SCK = 0;
delayMicroseconds(1);
digitalWrite(SCLK, HIGH);//SCK = 1;
if(digitalRead(SDIO)) { //if (SDIN) { // got a '1'
temp |= 0x1;
}
temp = (temp << 1); // shift left
delayMicroseconds(1);
}
digitalWrite(NCS, HIGH);//nADNSCS = 1; // de-select the chip
return temp;
}
All I get back right now is 254 from the SDIO, so any ideas or advice would be deeply deeply appreciated. Thanks!