Cannot read registres of TDC-GP22 using Arduino Uno

Projects Programming
1

Hello all,

I'm trying to implement the TDC-GP22 Time-to-Digital Converter using an Arduino Uno. I used the code of leokoppel(GitHub - leokoppel/GP22: An Arduino library for the Acam GP22 Time-to-Digital Converter), and I followed what he says to put the GP22 into the Arduino library. The wiring between GP22 and Uno is also checked as the author mentioned in the code:

* Test setup (Arduino Uno, through 5->3.3V level shift)
 *     10 -> SS
 *     11 -> MOSI
 *     12 -> MISO
 *     13 -> SCK
 *     2  -> INT
 *     5V -> VCC
 *     GND -> GND
 *     4 -> DS18B20 temperature sensor (optional)

Since the temperature sensor is optional , I didn't put it. I saw there is a 3.3V port on Uno so I use it directly.I don't know if it matters.
Besides, the GP22-DEMO-KIT is already connected to the 15-pin VGA connector so the wiring is in fact between Uno and VGA. I don't know neither if this will cause problem.

And one thing strange in the code, it has const bool DEBUG = 0; and Serial.begin(DEBUG ? 115200 : 1000000); which means the serails baud rate will be 1000000, right? And it doesn't work if I keep this value of DEBUG. So I change it to 1 and when I upload, error like this:

attached pinChangeISR_debug
/\Temp sensor: no addresses.
Starting up
/\/\/\/\/\/\/est took 820 us
Read/write test failed!

That means the test of reading data from register 5 failed. And I also tried to read other registers, but all I got is 0.
If I skip this step of testcommunication, I got the following:

attached pinChangeISR_debug
/\/Temp sensor: no addresses.
Starting up
\/\/\/\/\/\/
Register 0:	0x00041223
Register 1:	0x0141000f
Register 2:	0xa0000000
Register 3:	0x20000000
Register 4:	0x20000000
Register 5:	0x00000041
Register 6:	0x00200000

Calibrating...
attached pinChangeISR_debug
\/
Calibrating resonator. Theoretical: 1953.1250
\/\Resonator: 0.0000


Calibrating TDC.
Regular measurement (0): 0.0000

Status = 0x0
ALU pointer 0
Hits (ch1, ch2) = 0,0

Cal: -6
Corr: inf
Cal freq: inf
attached ISR at 0x33D
Calibration failed.

I don't know whether it is the problem of write registers or read registers, or even the both.

I put the documents' links as follow:
GP22 Datasheet
GP22-DEMO-KIT User Guide

Thanks in advance for any help!

2

Or is it possible that there's something wrong with the SPI? Though I prefer to believe that's not the case...

3

Still stuck in this, can someone help?

4


I also tried with the software offered with the GP22-DEMO-KIT, and I got some results. Not sure if it is good, there is something at least. But from Arduino still cannot read anything in the registres. All I got is always 0,0 and 0!