OV7691 sensor?

[daniel-dona]

I thought one sensor I have was an OV7670 but ID is different, registers read:

0x0A -> 76
0x0B -> 91

I can only find a datasheet for OV7690, nothing about a sensor called OV7691... Is detected by TXW A9 board.

I2C communication captured: https://github.com/daniel-dona/beken7252-opencam/blob/release_1/logs/i2c/twx806_ov76xx_init.txt

Datasheet for OV7690: ov7690_full.pdf

[daniel-dona]

Originally captured communication for this sensor was wrong, maybe the firmware detected another OV sensor by mistake and initialized that. In any case, TWX was not the original board/chip were I got the sensor.

This sensor was originally on a BK7252 camera, I found the original firmware (Naxcloud) searching for "OV769" string and after flashing, testing the video worked and capturing again I2C communication... this sensor will probably work. I still have to rewrite the register table for the initialization.

https://github.com/daniel-dona/beken7252-opencam/blob/1047e9b993ab523e2bef2a67c69d1dfddd39250c/logs/i2c/bk7252_nax_ov7690_init.txt

[daniel-dona]

Is still not clear if this is OV7691 or OV7690 (camera log states OV7690), but on OV sensors two registers typically identify the sensor with a value equal to the sensor name.

Reg 0x0A -> Value 0x76
Reg 0x0B -> Value 0x91

Most implementation I could find on GitHub only use the first register (probably this is why the TXW identified the sensor wrong), but proper identification should use both, all OV76XX sensors will have that register as 0x76.

https://github.com/chinahby/1110/blob/d2f5b81c80b23bc07dfacf6d8063f0f2a04487f8/main/multimedia/dsp/sensor/AIT_sensor_OV7690.c#L7

Here they seem to define both as equivalent...

[divadiow]

RK3308_ov7690.zip

couple of bits mentioning 'OV769' from Rockchip RK3308 Tuya SDK