Communication protocol

Note

This demo is based on a 5MP camera

From camera to host

Start

CommandType

payloadLength

payload

Stop

0X55AA

CMD(bit[8:0])

lenght(Little-endian,bit[32:0])

payload

0x55BB

start

cmdtype

payloadlength

payload

stop

55aa

01

image length

image date

55bb

55aa

02

info length

camera info

55bb

55aa

03

04 00 00 00

yy mm dd version([7:4].[3-0])

55bb

55aa

05

04 00 00 00

yy mm dd version([7:4].[3-0])

55bb

55aa

06

09 00 00 00

“streamoff”

55bb

From host to camera

Start

Command

Parameter

Stop

0X55

CMD

parameter

0xAA

CMD

Command effect

parameter

0x01

Set camera resolution
bit[6:4]: Camera data format

  • 1: Indicates that the resolution of the JPEG format is set

  • 2: Indicates the resolution of the RGB565 format

  • 3: Indicates the resolution of the YUV format bit

[3:0]: Set the resolution of the camera

  • 0: 160x120

  • 1: 320x240

  • 2: 640x480

  • 3: 800x600

  • 4: 1280x720

  • 5: 1280x960

  • 6: 1600x1200

  • 7: 1920x1080

  • 8: 2048x1536

  • 9: 2592x1944

0x02

Start streaming mode

  • 1: 320x240

  • 2: 640x480

0x03

Set brightness

  • 0：default

  • 1：+1

  • 2：-1

  • 3：+2

  • 4：-2

  • 5：+3

  • 6：-3

  • 7：+4

  • 8：-4

0x04

Set contrast

  • 0：default

  • 1：+1

  • 2：-1

  • 3：+2

  • 4：-2

  • 5：+3

  • 6：-3

0x05

Set saturation

  • 0：default

  • 1：+1

  • 2：-1

  • 3：+2

  • 4：-2

  • 5：+3

  • 6：-3

0x06

Set EV

  • 0：default

  • 1：+1

  • 2：-1

  • 3：+2

  • 4：-2

  • 5：+3

  • 6：-3

0x07

Set white balance

  • 0：Auto

  • 1：Sunny

  • 2：Office

  • 3：Cloudy

  • 4：Home

0x08

Set special effects

  • 0：Normal

  • 1：Cool light

  • 2：Warm

  • 3：Black and white

  • 4：Sepia

  • 5：Negative

  • 6：Greenish

  • 7：Overexposure

  • 8：Solarize

  • 9: Yellowish

0x09

Focus control
Exclusive to 5MP

  • 0：Open auto focus basic configuration

  • 1：Single auto focus

  • 2：Continuous autofocus

  • 3：Pause auto focus

  • 4：Turn off auto focus

0x0a

Exposure control

  • 1: Turn on auto exposure

  • 0: Turn off auto exposure

0x0b

Gain control

  • 1: Turn on auto gain

  • 0: Turn off auto gain

0x0c

White balance control

  • 1: Turn on auto white balance

  • 0: Turn off auto white balance

0x0d

Manual gain
Gain value of two bytes

  • 5MP adjustment range: 10~1023

  • 3MP adjustment range: 1~31

0x0e

Manual exposure
exposure value of three bytes

  • 5MP adjustment range: 1000~30000

  • 3MP adjustment range: 100~1400

0x0f

getting information

Get the basic information of the camera. For example: the resolution supported by the camera, whether the camera supports auto focus

0x10

Taking Pictures

0x11

Set sharpness
Exclusive to 3MP

  • 0：default

  • 1：+1

  • 2：+2

  • 3：+3

  • 4：+4

  • 5：+5

  • 6：+6

  • 7：+7

  • 8：+8

0x12

Debug mode
Three bytes

  • Byte 1 represents the high eight bits of the register

  • Byte 2 represents the lower eight bits of the register

  • Byte 3 represents the value written to the register

0x21

Stop streaming mode