Hello,
I would like to report a minor error in MT9V034 camera sensor initialization for PX4Flow module which I have found.
The error is in the file mt9v034.c[0] where there is on line 183 (197 for Context B respectively)

mt9v034_WriteReg16(MTV_V2_CTRL_REG_A, total_shutter_width);

where MTV_V2_CTRL_REG_A is 0x32 and total_shutter_width is defined as 0x1e0 (480 Dec).

I suppose that this is incorrect because according to the datasheet[1] V2_CTRL_REG_A is a voltage control register with allowed values from 0 to 63 and default value of 0x1e used for HDR knee thresholds. I suppose that there should be

183   mt9v034_WriteReg16(MTV_COARSE_SW_TOTAL_REG_A, total_shutter_width);
197   mt9v034_WriteReg16(MTV_COARSE_SW_TOTAL_REG_B, total_shutter_width);

respectively.
Addressing issue of DrTon #41 on a garbage image this is caused by the "feature" of the sensor. It simply stops working when there is massive change in lighting conditions. I suppose that it is somehow related with the AEC and AGC features of the sensor. It is also greatly influenced by how well the lens is focused. I am currently performing experiments with an FPGA based module with mt9v034 sensor so I will post the solution if I will resolve the problem.

Have a nice day,
Petr

[0] https://github.com/PX4/Flow/blob/master/src/mt9v034.c
[1] http://www.aptina.com/assets/downloadDocument.do?id=406