DataCheck Error in MLX90641_GetFrameData

[LiangZai-Embedded]

Hi,
I found an I2C write-and-then-read mismatch in MLX90641_GetFrameData function and returns an error.

int MLX90641_GetFrameData(uint8_t slaveAddr, uint16_t *frameData)
{
....
error = MLX90641_I2CWrite(slaveAddr, 0x8000, 0x0030);
....

Thru logic analyzer I find that the controller write 0x8000(reg) and 0x0030(data) to dev and read back with data= 0x0011. Is it normal?

The bit 5 is asserted in 0x0030, in datasheet it describes“Set Start Of Measurement – Bit5 in 0x8000” in step mode. What is step mode? And I see the definition of reg 0x8000, Bit 5 is reserved. It makes me very confused.