Hi, In the documentation is shown the address 0xa3 for the external eeprom must be

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Enabling UART mode about z-camera-doc HOT 24 OPEN

imaginevision commented on August 29, 2024

Enabling UART mode

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Comments (24)

RagnarJensen commented on August 29, 2024 2

I have it working on the bench, using a real 24C02B EEPROM at address 0x51.
EEPROMs larger than 16Kbit cannot be used, because they use 2 byte addressing.

When the camera starts up, the first transaction on the i2c bus my logic analyzer sees is this:

The camera reads the first byte from device 0x51, which returns the value 3.
Note that you don't get any visible reaction from the camera at this stage. It's not until you actually start to send it commands that it does something.

Then it enters a loop, continually reading from device 0x48, which is a temperature sensor inside the camera:

The sensor responds with the temperature value encoded in 12 bits.

The terminal program on my PC has macro key functionality, which enables me to send the required binary strings to the camera.
E.g. to switch to stills mode, I send these four binary bytes (here in decimal); 234, 2, 1, 3
which is 0xea 0x02 0x01 0x03 when expressed in hexadecimal.

It looks like a rat's nest, but it works... 😃

Cheers,
Ragnar

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garciaanto commented on August 29, 2024 2

Sure:

#include <Wire.h>

void setup() {
  Serial.begin (9600);
  Wire.begin(0x51);
  Wire.onRequest(requestEvent);
}

void loop() {
  // :DD
}

void requestEvent() {
  Wire.write(0x03);
  Serial.println (" envío un 0x3");
}

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garciaanto commented on August 29, 2024 1

I totally forgot this post that I opened. I have it also working.
In my case I couldnt make it works with eeprom but I used an small arduino instead. And to be honest I do not respond to the temperature query :)

To test it I just used a simple vb .net program to test some functions and more or less was working.
Also, I upgraded the cam to the WEB latest on using the manual process (just drop the image on the root folder)

Good luck!

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garciaanto commented on August 29, 2024 1

Not sure if I understand your question. If you ask regarding the connections:

CAM side Arduino side
GND GND
SDA SDA
SCL SCL

If you want, you can also power up the arduino with the cam (CAM VCOM to Arduino Vin)

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RagnarJensen commented on August 29, 2024 1

Yes, it is possible to focus "manually" with UART commands. ~~I put "manually" in quotes, because the camera must be in AF mode for it to work.~~ EDIT: Later experiments show that the camera does react to focus commands when in MF mode.

I've been experimenting with some of the commands in "Z-Camera-Doc/expansion/expansion.md" and so far I've been able to

Switch back and forth between MF and AF.
Switch back and forth between Movie and Stills mode.
Take stills pictures.
Record movies.
Query the camera for the lens focus position.
Set the lens focus position.
Control the focus speed (how fast the lens changes to a new focus position)

In the screenshots from my logic analyzer below, Async 0 is the camera's RX line, i.e. commands from my computer to the camera. Async 1 is the camera's TX line, responses from the camera to my computer.

If I send this, which is the GET CAMERA_CONFIG_LENS_FOCUS_POSITION command,

the camera responds with

The four bytes highlighted in yellow hold the current lens position. In the pic above it's focused at infinity. When focused at its near limit, the camera's response on the query is

Note the change in the yellow framed bytes. I have only tested with one lens (Olympus 25mm/1.8) so far, but I suspect the position values for close focus and infinity might be different for other lenses.

Finally, by sending SET CAMERA_CONFIG_LENS_FOCUS_POSITION commands, it is possible to position the focus point anywhere between the end points.

Command to set focus to near limit - focus position in the four bytes framed in yellow:

Command to set focus to infinity:

Command to set focus somewhere in-between:

I'm still very much in exploratory mode. I feel that the documentation on the UART commands is somewhat lacking in details... 😜
So, I've been doing a lot of trying out things, testing and experimenting. But at least I now know the key press sequence to reset the camera to factory defaults by heart 😆

I'll be away for a while, but I'll try to do a little write-up and maybe some code example when I get back.

Cheers, Ragnar

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skadiexe commented on August 29, 2024

0x51 is 0xA3 shifted 1 bit right. it is the same 7-bit adress.
1 or 0 in LSB means Read or Write while accessing eeprom

p.s. my camera do not have any activity on i2c overall, always logic 1 on SDA/SCL

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