List of GoPro Hero 4 I2C Commands

The following tree (Fig. 1) represents all the I2C commands of GoPro Hero 4 camera. Actual I2C packets that the camera understands are in a binary form and further wrapped by packet size, useless constant header bytes, session numbers, etc. So we don't want to go into gory detail of the binary array but we explain human-readable strings that both MewPro Iliad and MewPro4 softwares also understand.

Command Tree

Click '+' to expand a branch and '-' to shrink.

YY command
- * (don't care): extended YY command
  - 0x01: mode change
    - 0x00: GET_CAMERA main mode; argc = 0x0000
    - 0x01: SET_CAMERA main mode; argc = 0x0001; argv[] = { mode }
      - mode
      - 0x00: video
      - 0x01: photo
      - 0x02: multi-shot
      - 0x04: playback
      - 0x05: setup
      - 0x06: audio
    - 0x04: GET_CAMERA sub mode; argc = 0x0000
    - 0x05: SET_CAMERA sub mode; argc = 0x0002; argv[] = { mode, submode }
      - mode, submode
      - 0x00, 0x00: video
      - 0x00, 0x01: timelapse video
      - 0x00, 0x02: photo in video
      - 0x00, 0x03: looping video
      - 0x01, 0x00: single photo
      - 0x01, 0x01: continuous photo
      - 0x01, 0x02: night photo
      - 0x02, 0x00: burst photo
      - 0x02, 0x01: timelapse photo
      - 0x02, 0x02: nightlapse photo
  - 0x02: video
    - 0x00: GET_CAMERA default sub mode; argc = 0x0000
    - 0x01: SET_CAMERA default sub mode; argc = 0x0001; argv[] = { submode }
      - submode
      - 0x00: video
      - 0x01: timelapse video
      - 0x02: photo in video
      - 0x03: looping video
    - 0x02: GET_CAMERA video mode; argc = 0x0000
    - 0x03: SET_CAMERA video mode; argc = 0x0003; argv[] = { resolution, fps, fov }
      - resolution
      - 0x01: 4k
      - 0x02: 4k SuperView
      - 0x04: 2.7k
      - 0x05: 2.7k SuperView
      - 0x06: 2.7k 4:3
      - 0x07: 1440
      - 0x08: 1080 SuperView
      - 0x09: 1080
      - 0x0A: 960
      - 0x0B: 720 SuperView
      - 0x0C: 720
      - 0x0D: WVGA
      - fps
      - 0x00: 240
      - 0x01: 120
      - 0x02: 100
      - 0x03: 90
      - 0x04: 80
      - 0x05: 60
      - 0x06: 50
      - 0x07: 48
      - 0x08: 30
      - 0x09: 25
      - 0x0A: 24
      - 0x0B: 15
      - 0x0C: 12.5
      - fov
      - 0x00: wide
      - 0x01: medium
      - 0x02: narrow
      - 0x04: linear (v5 or later firmware only)
    - 0x04: GET_CAMERA video + photo; argc = 0x0000
    - 0x05: SET_CAMERA video + photo; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x01: 1 photo per 5 seconds
      - 0x02: 1 photo per 10 seconds
      - 0x03: 1 photo per 30 seconds
      - 0x04: 1 photo per 60 seconds
    - 0x06: GET_CAMERA looping; argc = 0x0000
    - 0x07: SET_CAMERA looping; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x00: maximum
      - 0x01: 5 minutes
      - 0x02: 20 minutes
      - 0x03: 60 minutes
      - 0x04: 120 minutes
    - 0x08: GET_CAMERA low light; argc = 0x0000
    - 0x09: SET_CAMERA low light; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x0A: GET_CAMERA spot meter; argc = 0x0000
    - 0x0B: SET_CAMERA spot meter; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x0C: GET_CAMERA timelapse rate; argc = 0x0000
    - 0x0D: SET_CAMERA timelapse rate; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x00: 0.5 seconds
      - 0x01: 1 second
      - 0x02: 2 seconds
      - 0x03: 5 seconds
      - 0x04: 10 seconds
      - 0x05: 30 seconds
      - 0x06: 60 seconds
    - 0x0E: GET_CAMERA protune; argc = 0x0000
    - 0x0F: SET_CAMERA protune; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x10: GET_CAMERA protune white balance; argc = 0x0000
    - 0x11: SET_CAMERA protune white balance; argc = 0x0001; argv[] = { wb }
      - wb
      - 0x00: auto
      - 0x01: 3000K
      - 0x02: 5500K
      - 0x03: 6500K
      - 0x04: native
      - 0x05: 4000K (v4 or later firmware only)
      - 0x06: 4800K (v4 or later firmware only)
      - 0x07: 6000K (v4 or later firmware only)
    - 0x12: GET_CAMERA protune color; argc = 0x0000
    - 0x13: SET_CAMERA protune color; argc = 0x0001; argv[] = { color }
      - color
      - 0x00: GoPro color
      - 0x01: flat
    - 0x14: GET_CAMERA protune sharpness; argc = 0x0000
    - 0x15: SET_CAMERA protune sharpness; argc = 0x0001; argv[] = { sharpness }
      - sharpness
      - 0x00: high
      - 0x01: medium
      - 0x02: low
    - 0x16: GET_CAMERA protune ISO; argc = 0x0000
    - 0x17: SET_CAMERA protune ISO; argc = 0x0001; argv[] = { limit }
      - limit
      - 0x00: 6400
      - 0x01: 1600
      - 0x02: 400
      - 0x03: 3200
      - 0x04: 800
      - 0x07: 200 (v4 or later firmware only)
      - 0x08: 100 (v4 or later firmware only)
    - 0x18: GET_CAMERA protune exposure value; argc = 0x0000
    - 0x19: SET_CAMERA protune exposure value; argc = 0x0001; argv[] = { ev }
      - ev
      - 0x00: +2.0
      - 0x01: +1.5
      - 0x02: +1.0
      - 0x03: +0.5
      - 0x04: 0
      - 0x05: -0.5
      - 0x06: -1.0
      - 0x07: -1.5
      - 0x08: -2.0
    - 0x1A: SET_CAMERA reset protune; argc = 0x0000
    - 0x1B: SET_CAMERA shutter button depressed. start recording; argc = 0x0000
    - 0x1C: SET_CAMERA stop recording; argc = 0x0000
    - 0x26: SET_CAMERA bulk set video settings; argc = 0x0060; argv[]
      - video
      - argv[0]: current submode (defunct)
      - argv[1]: power on submode
      - argv[2]: resolution
      - argv[3]: fps
      - argv[4]: fov
      - argv[5]: video + photo interval
      - argv[6]: looping
      - argv[7]: spot meter
      - argv[8]: low light
      - argv[9]: timelapse interval
      - argv[10]: protune
      - argv[11]: color
      - argv[12]: sharpness
      - argv[13]: ISO limit
      - argv[14]: exposure compensation
      - argv[15]: white balance
      - argv[16]: shutter
      - argv[17]: ISO mode
      - argv[18:23]: (no use)
      - timelapse video
      - argv[24]: current submode (defunct)
      - argv[25]: power on submode
      - argv[26]: resolution
      - argv[27]: fps
      - argv[28]: fov
      - argv[29]: video + photo interval
      - argv[30]: looping
      - argv[31]: spot meter
      - argv[32]: low light
      - argv[33]: timelapse interval
      - argv[34]: protune
      - argv[35]: color
      - argv[36]: sharpness
      - argv[37]: ISO limit
      - argv[38]: exposure compensation
      - argv[39]: white balance
      - argv[40]: shutter
      - argv[41]: ISO mode
      - argv[42:47]: (no use)
      - video + photo
      - argv[48]: current submode (defunct)
      - argv[49]: power on submode
      - argv[50]: resolution
      - argv[51]: fps
      - argv[52]: fov
      - argv[53]: video + photo interval
      - argv[54]: looping
      - argv[55]: spot meter
      - argv[56]: low light
      - argv[57]: timelapse interval
      - argv[58]: protune
      - argv[59]: color
      - argv[60]: sharpness
      - argv[61]: ISO limit
      - argv[62]: exposure compensation
      - argv[63]: white balance
      - argv[64]: shutter
      - argv[65]: ISO mode
      - argv[66:71]: (no use)
      - looping
      - argv[72]: current submode (defunct)
      - argv[73]: power on submode
      - argv[74]: resolution
      - argv[75]: fps
      - argv[76]: fov
      - argv[77]: video + photo interval
      - argv[78]: looping
      - argv[79]: spot meter
      - argv[80]: low light
      - argv[81]: timelapse interval
      - argv[82]: protune
      - argv[83]: color
      - argv[84]: sharpness
      - argv[85]: ISO limit
      - argv[86]: exposure compensation
      - argv[87]: white balance
      - argv[88]: shutter
      - argv[89]: ISO mode
      - argv[90:95]: (no use)
    - 0x27: GET_CAMERA exposure time (v4 or later firmware only); argc = 0x0000
    - 0x28: SET_CAMERA exposure time (v4 or later firmware only); argc = 0x0001; argv[] = { shutter }
      - shutter
      - 0x00: auto
      - 0x01: 1/12.5
      - 0x02: 1/15
      - 0x03: 1/24
      - 0x04: 1/25
      - 0x05: 1/30
      - 0x06: 1/48
      - 0x07: 1/50
      - 0x08: 1/60
      - 0x09: 1/80
      - 0x0A: 1/90
      - 0x0B: 1/96
      - 0x0C: 1/100
      - 0x0D: 1/120
      - 0x0E: 1/160
      - 0x0F: 1/180
      - 0x10: 1/192
      - 0x11: 1/200
      - 0x12: 1/240
      - 0x13: 1/320
      - 0x14: 1/360
      - 0x15: 1/400
      - 0x16: 1/480
      - 0x17: 1/960
    - 0x29: GET_CAMERA protune ISO mode (v4 or later firmware only); argc = 0x0000
    - 0x2A: SET_CAMERA protune ISO mode (v4 or later firmware only); argc = 0x0001; argv[] = { mode }
      - mode
      - 0x00: maximum
      - 0x01: lock
  - 0x03: photo
    - 0x00: GET_CAMERA default sub mode; argc = 0x0000
    - 0x01: SET_CAMERA default sub mode; argc = 0x0001; argv[] = { submode }
      - submode
      - 0x00: single
      - 0x01: continuous
      - 0x02: night
    - 0x02: GET_CAMERA resolution; argc = 0x0000
    - 0x03: SET_CAMERA resolution; argc = 0x0001; argv[] = { resolution }
      - resolution
      - 0x00: 12MP wide
      - 0x01: 7MP wide
      - 0x02: 7MP medium
      - 0x03: 5MP medium
    - 0x04: GET_CAMERA continuous rate; argc = 0x0000
    - 0x05: SET_CAMERA continuous rate; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x00: 3 frames per second
      - 0x01: 5 frames per second
      - 0x02: 10 frames per second
    - 0x06: GET_CAMERA spot meter; argc = 0x0000
    - 0x07: SET_CAMERA spot meter; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x08: GET_CAMERA exposure time; argc = 0x0000
    - 0x09: SET_CAMERA exposure time; argc = 0x0001; argv[] = { shutter }
      - shutter
      - 0x00: auto
      - 0x01: 2 seconds
      - 0x02: 5 seconds
      - 0x03: 10 seconds
      - 0x04: 15 seconds
      - 0x05: 20 seconds
      - 0x06: 30 seconds
    - 0x0A: GET_CAMERA protune; argc = 0x0000
    - 0x0B: SET_CAMERA protune; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x0C: GET_CAMERA protune white balance; argc = 0x0000
    - 0x0D: SET_CAMERA protune white balance; argc = 0x0001; argv[] = { wb }
      - wb
      - 0x00: auto
      - 0x01: 3000K
      - 0x02: 5500K
      - 0x03: 6500K
      - 0x04: native
      - 0x05: 4000K (v4 or later firmware only)
      - 0x06: 4800K (v4 or later firmware only)
      - 0x07: 6000K (v4 or later firmware only)
    - 0x0E: GET_CAMERA protune color; argc = 0x0000
    - 0x0F: SET_CAMERA protune color; argc = 0x0001; argv[] = { color }
      - color
      - 0x00: GoPro color
      - 0x01: flat
    - 0x10: GET_CAMERA protune sharpness; argc = 0x0000
    - 0x11: SET_CAMERA protune sharpness; argc = 0x0001; argv[] = { sharpness }
      - sharpness
      - 0x00: high
      - 0x01: medium
      - 0x02: low
    - 0x12: GET_CAMERA protune ISO maximum; argc = 0x0000
    - 0x13: SET_CAMERA protune ISO maximum; argc = 0x0001; argv[] = { ISO }
      - ISO
      - 0x00: 800
      - 0x01: 400
      - 0x02: 200
      - 0x03: 100
    - 0x14: GET_CAMERA protune exposure value; argc = 0x0000
    - 0x15: SET_CAMERA protune exposure value; argc = 0x0001; argv[] = { ev }
      - ev
      - 0x00: +2.0
      - 0x01: +1.5
      - 0x02: +1.0
      - 0x03: +0.5
      - 0x04: 0
      - 0x05: -0.5
      - 0x06: -1.0
      - 0x07: -1.5
      - 0x08: -2.0
    - 0x16: SET_CAMERA reset protune; argc = 0x0000
    - 0x17: SET_CAMERA shutter button depressed. start recording; argc = 0x0000
    - 0x18: SET_CAMERA stop recording (continuous submode only); argc = 0x0000
    - 0x1B: SET_CAMERA bulk set photo settings; argc = 0x003C; argv[]
      - single
      - argv[0]: current submode (defunct)
      - argv[1]: power on submode
      - argv[2]: resolution
      - argv[3]: interval
      - argv[4]: spot meter
      - argv[5]: shutter
      - argv[6]: protune
      - argv[7]: color
      - argv[8]: sharpness
      - argv[9]: ISO maximum
      - argv[10]: exposure compensation
      - argv[11]: white balance
      - argv[12]: ISO minimum
      - argv[13:19]: (no use)
      - continuous
      - argv[20]: current submode (defunct)
      - argv[21]: power on submode
      - argv[22]: resolution
      - argv[23]: interval
      - argv[24]: spot meter
      - argv[25]: shutter
      - argv[26]: protune
      - argv[27]: color
      - argv[28]: sharpness
      - argv[29]: ISO maximum
      - argv[30]: exposure compensation
      - argv[31]: white balance
      - argv[32]: ISO minimum
      - argv[33:39]: (no use)
      - night
      - argv[40]: current submode (defunct)
      - argv[41]: power on submode
      - argv[42]: resolution
      - argv[43]: interval
      - argv[44]: spot meter
      - argv[45]: shutter
      - argv[46]: protune
      - argv[47]: color
      - argv[48]: sharpness
      - argv[49]: ISO maximum
      - argv[50]: exposure compensation
      - argv[51]: white balance
      - argv[52]: ISO minimum
      - argv[53:59]: (no use)
    - 0x1C: GET_CAMERA protune ISO minimum (v4 or later firmware only); argc = 0x0000
    - 0x1D: SET_CAMERA protune ISO minimum (v4 or later firmware only); argc = 0x0001; argv[] = { ISO }
      - ISO
      - 0x00: 800
      - 0x01: 400
      - 0x02: 200
      - 0x03: 100
  - 0x04: multi-shot
    - 0x00: GET_CAMERA default sub mode; argc = 0x0000
    - 0x01: SET_CAMERA default sub mode; argv[] = { submode }
      - submode
      - 0x00: burst
      - 0x01: timelapse
      - 0x02: nightlapse
    - 0x02: GET_CAMERA resolution; argc = 0x0000
    - 0x03: SET_CAMERA resolution; argc = 0x0001; argv[] = { resolution }
      - resolution
      - 0x00: 12MP wide
      - 0x01: 7MP wide
      - 0x02: 7MP medium
      - 0x03: 5MP medium
    - 0x04: GET_CAMERA burst rate; argc = 0x0000
    - 0x05: SET_CAMERA burst rate; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x00: 3 photos / 1 second
      - 0x01: 5 photos / 1 second
      - 0x02: 10 photos / 1 second
      - 0x03: 10 photos / 2 seconds
      - 0x04: 10 photos / 3 seconds
      - 0x05: 30 photos / 1 second
      - 0x06: 30 photos / 2 seconds
      - 0x07: 30 photos / 3 seconds
      - 0x08: 30 photos / 6 seconds
    - 0x06: GET_CAMERA timelapse rate; argc = 0x0000
    - 0x07: SET_CAMERA timelapse rate; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x00: 1 photo / 0.5 seconds
      - 0x01: 1 photo / 1 second
      - 0x02: 1 photo / 2 seconds
      - 0x03: 1 photo / 5 seconds
      - 0x04: 1 photo / 10 seconds
      - 0x05: 1 photo / 30 seconds
      - 0x06: 1 photo / 60 seconds
    - 0x08: GET_CAMERA nightlapse rate; argc = 0x0000
    - 0x09: SET_CAMERA nightlapse rate; argc = 0x0001; argv[] = { interval }
      - interval
      - 0x00: 10 seconds
      - 0x01: 15 seconds
      - 0x02: 20 seconds
      - 0x03: 30 seconds
      - 0x04: 1 minute
      - 0x05: 2 minutes
      - 0x06: 5 minutes
      - 0x07: 30 minutes
      - 0x08: 60 minutes
    - 0x0A: GET_CAMERA spot meter; argc = 0x0000
    - 0x0B: SET_CAMERA spot meter; argc = 0x0001; argv[] = { status }
      - state
      - 0x00: off
      - 0x01: on
    - 0x0C: GET_CAMERA exposure time; argc = 0x0000
    - 0x0D: SET_CAMERA exposure time; argc = 0x0001; argv[] = { shutter }
      - shutter
      - 0x00: auto
      - 0x01: 2 seconds
      - 0x02: 5 seconds
      - 0x03: 10 seconds
      - 0x04: 15 seconds
      - 0x05: 20 seconds
      - 0x06: 30 seconds
    - 0x0E: GET_CAMERA protune; argc = 0x0000
    - 0x0F: SET_CAMERA protune; argc = 0x0001; argv[] = { status }
      - state
      - 0x00: off
      - 0x01: on
    - 0x10: GET_CAMERA protune white balance; argc = 0x0000
    - 0x11: SET_CAMERA protune white balance; argc = 0x0001; argv[] = { wb }
      - wb
      - 0x00: auto
      - 0x01: 3000K
      - 0x02: 5500K
      - 0x03: 6500K
      - 0x04: native
      - 0x05: 4000K (v4 or later firmware only)
      - 0x06: 4800K (v4 or later firmware only)
      - 0x07: 6000K (v4 or later firmware only)
    - 0x12: GET_CAMERA protune color; argc = 0x0000
    - 0x13: SET_CAMERA protune color; argc = 0x0001; argv[] = { color }
      - color
      - 0x00: GoPro color
      - 0x01: flat
    - 0x14: GET_CAMERA protune sharpness; argc = 0x0000
    - 0x15: SET_CAMERA protune sharpness; argc = 0x0001; argv[] = { sharpness }
      - sharpness
      - 0x00: high
      - 0x01: medium
      - 0x02: low
    - 0x16: GET_CAMERA protune ISO; argc = 0x0000
    - 0x17: SET_CAMERA protune ISO; argc = 0x0001; argv[] = { ISO }
      - ISO
      - 0x00: 800
      - 0x01: 400
      - 0x02: 200
      - 0x03: 100
    - 0x18: GET_CAMERA protune exposure value; argc = 0x0000
    - 0x19: SET_CAMERA protune exposure value; argc = 0x0001; argv[] = { ev }
      - ev
      - 0x00: +2.0
      - 0x01: +1.5
      - 0x02: +1.0
      - 0x03: +0.5
      - 0x04: 0
      - 0x05: -0.5
      - 0x06: -1.0
      - 0x07: -1.5
      - 0x08: -2.0
    - 0x1A: SET_CAMERA reset protune; argc = 0x0000
    - 0x1B: SET_CAMERA shutter button depressed. start recording; argc = 0x0000
    - 0x1C: SET_CAMERA stop recording; argc = 0x0000
    - 0x20: SET_CAMERA bulk set photo settings; argc = 0x0042; argv[]
      - burst
      - argv[0]: current submode (defunct)
      - argv[1]: power on submode
      - argv[2]: resolution
      - argv[3]: rate
      - argv[4]: timelapse interval
      - argv[5]: nightlapse interval
      - argv[6]: spot meter
      - argv[7]: shutter
      - argv[8]: protune
      - argv[9]: color
      - argv[10]: sharpness
      - argv[11]: ISO maximum
      - argv[12]: exposure compensation
      - argv[13]: white balance
      - argv[14]: ISO minimum
      - argv[15:21]: (no use)
      - timelapse
      - argv[22]: current submode (defunct)
      - argv[23]: power on submode
      - argv[24]: resolution
      - argv[25]: rate
      - argv[26]: timelapse interval
      - argv[27]: nightlapse interval
      - argv[28]: spot meter
      - argv[29]: shutter
      - argv[30]: protune
      - argv[31]: color
      - argv[32]: sharpness
      - argv[33]: ISO maximum
      - argv[34]: exposure compensation
      - argv[35]: white balance
      - argv[36]: ISO minimum
      - argv[37:43]: (no use)
      - nightlapse
      - argv[44]: current submode (defunct)
      - argv[45]: power on submode
      - argv[46]: resolution
      - argv[47]: rate
      - argv[48]: timelapse interval
      - argv[49]: nightlapse interval
      - argv[50]: spot meter
      - argv[51]: shutter
      - argv[52]: protune
      - argv[53]: color
      - argv[54]: sharpness
      - argv[55]: ISO maximum
      - argv[56]: exposure compensation
      - argv[57]: white balance
      - argv[58]: ISO minimum
      - argv[59:65]: (no use)
    - 0x21: GET_CAMERA protune ISO minimum (v4 or later firmware only); argc = 0x0000
    - 0x22: SET_CAMERA protune ISO minimum (v4 or later firmware only); argc = 0x0001; argv[] = { ISO }
      - ISO
      - 0x00: 800
      - 0x01: 400
      - 0x02: 200
      - 0x03: 100
  - 0x07: global settings
    - 0x00: GET_CAMERA LCD brightness; argc = 0x0000
    - 0x01: SET_CAMERA LCD brightness; argc = 0x0001; argv[] = { brightness }
      - brightness
      - 0x00: high
      - 0x01: medium
      - 0x02: low
    - 0x02: GET_CAMERA LCD sleep; argc = 0x0000
    - 0x03: SET_CAMERA LCD sleep; argc = 0x0001; argv[] = { sleep }
      - sleep
      - 0x00: never
      - 0x01: 1 minute
      - 0x02: 2 minutes
      - 0x03: 3 minutes
    - 0x04: GET_CAMERA LCD lock; argc = 0x0000
    - 0x05: SET_CAMERA LCD lock; argc = 0x0001; argv[] = { state}
      - state
      - 0x00: off
      - 0x01: on
    - 0x06: GET_CAMERA LCD power; argc = 0x0000
    - 0x07: SET_CAMERA LCD power; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x08: GET_CAMERA orientation; argc = 0x0000
    - 0x09: SET_CAMERA orientation; argc = 0x0001; argv[] = { orientation }
      - orientation
      - 0x00: auto
      - 0x01: up
      - 0x02: down
    - 0x0A: GET_CAMERA default mode; argc = 0x0000
    - 0x0B: SET_CAMERA default mode; argc = 0x0001; argv[] = { mode }
      - mode
      - 0x00: video
      - 0x01: photo
      - 0x02: multi-shot
    - 0x0C: GET_CAMERA quick capture; argc = 0x0000
    - 0x0D: SET_CAMERA quick capture; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x0E: GET_CAMERA LEDs; argc = 0x0000
    - 0x0F: SET_CAMERA LEDs; argc = 0x0001; argv[] = { LEDs }
      - LEDs
      - 0x00: off
      - 0x01: 2
      - 0x02: 4
    - 0x10: GET_CAMERA beeps; argc = 0x0000
    - 0x11: SET_CAMERA beeps; argc = 0x0001; argv[] = { beeps }
      - beeps
      - 0x00: 100%
      - 0x01: 70%
      - 0x02: off
    - 0x12: GET_CAMERA video format; argc = 0x0000
    - 0x13: SET_CAMERA video format; argc = 0x0001; argv[] = { format }
      - format
      - 0x00: NTSC
      - 0x01: PAL
    - 0x14: GET_CAMERA OSD; argc = 0x0000
    - 0x15: SET_CAMERA OSD; argc = 0x0001; argv[] = { state }
      - state
      - 0x00: off
      - 0x01: on
    - 0x16: GET_CAMERA auto power down; argc = 0x0000
    - 0x17: SET_CAMERA auto power down; argc = 0x0001; argv[] = { minute }
      - minute
      - 0x00: never
      - 0x01: 1 minute
      - 0x02: 2 minutes
      - 0x03: 3 minutes
      - 0x04: 5 minutes
    - 0x1A: GET_CAMERA datetime; argc = 0x0000
    - 0x1B: SET_CAMERA datetime; argc = 0x0007; argv[] = { year_h, year_l, month, day, hour, minute, second }
      - year_h: high byte of year
      - year_l: low byte of year
      - month: month (1 - 12)
      - day: day (1 - 31)
      - hour: hour (0 - 23)
      - minute: minute (0 - 60)
      - second: second (0 - 60)
    - 0x1F: GET_CAMERA language; argc = 0x0000
    - 0x20: SET_CAMERA language; argc = 0x0001; argv[] = { language }
      - language
      - 0x00: English
      - 0x01: Simplified Chinese
    - 0x21: SET_CAMERA bulk set global settings; argc = 0x0023; argv[]
      - argv[0]: 0x20 (unknown constant)
      - argv[1]: 0x16 (unknown constant)
      - argv[2]: 0x01 (unknown constant)
      - argv[3]: 0x11 (unknown constant)
      - argv[4]: 0x00 (unknown constant)
      - argv[5]: 0x00 (unknown constant)
      - argv[6]: OSD
      - argv[7]: beeps
      - argv[8]: auto power off
      - argv[9]: LEDs
      - argv[10]: quick capture
      - argv[11]: orientation
      - argv[12]: LCD brightness
      - argv[13]: LCD sleep
      - argv[14]: LCD lock
      - argv[15]: LCD power
      - argv[16]: video format
      - argv[17]: language
      - argv[18:24]: (no use)
      - argv[25]: 0x01 (unknown constant)
      - argv[26]: default mode
      - argv[27]: default submode
      - argv[28]: high byte of year
      - argv[29]: low byte of year
      - argv[30]: month
      - argv[31]: day
      - argv[32]: hour
      - argv[33]: minute
      - argv[34]: second
  - 0x09: delete
    - 0x09: SET_CAMERA delete last; argc = 0x0000
    - 0x0A: SET_CAMERA delete all/format; argc = 0x0000
ZZ command
- 0x01:
  - 0x00: GET_BACPAC (unknown)
- 0x02:
  - 0x01: SET_BACPAC power on
- 0x03:
  - 0x00: GET_CAMERA version string
- 0x00: extended ZZ command
  - 0x00: SET_CAMERA sync source; argc = 0x01; argv[] = { source, 0x00 }
    - source
    - 0x00: external (multi camera)
    - 0x01: internal (standalone)
  - 0x01: SET_BACPAC camera sync status
    - 0x01; argv[] = { status, 0x00 }
      - status
      - 0x00: camera is recording
      - 0x01: camera is finished
    - 0x02; camera is blocking until microSD write complete; argv[] = { 0x00, 0x00 }
    - 0x07: camera is requesting external sync signal; argv[] = { 0x01, fps_h, fps_l, hsync_h, hsync_l, dummy_h, dummy_l }
      - fps_h: high byte of fps * 100
      - fps_l: low byte of fps * 100
      - hsync_h: high byte of number of HSYNC pulses in a frame (buggy)
      - hsync_l: low byte of number of HSYNC pulses in a frame (buggy)
      - dummy_h: (unknown. always equal to hsync_h)
      - dummy_l: (unknown. always equal to hsync_l)
  - 0x02: SET_BACPAC heartbeat; argc = 0x00
  - 0x03: SET_CAMERA power off; argc = 0x01; argv[] = { 0x01 }
  - 0x05: SET_CAMERA bacpac firmware version; argc = 0x03; argv[] = { version[3], 0x00 }
  - 0x06: SET_CAMERA bacpac serial number; argc = 0x08; argv[] = { serial_number[7], check_sum, 0x00 }

Fig. 1

Usage

The commands listed above are translated into I2C binary arrays for Hero 4 camera by MewPro Iliad or MewPro4 softwares. Both Iliad and MewPro can receive these strings through their default UART port (aka Serial in Arduino's terminology) at 57600 baud. A command consists of hexadecimal characters preceded by either YY or ZZ and followed by a newline character \n. These commands can be sent from your PC's terminal or Arduino Monitor easily.

Each node of the tree corresponds a command byte that is denoted by using two hexadecimal digits (0-9 and/or A-F).

Example 1: Changing camera mode to multi-shot = "YY000101000102\n".
This command string is obtained by clicking

"YY command" →
"* (don't care): extended YY command" →
"0x01: mode change" →
"0x01: SET_CAMERA main mode; argc = 0x0001; argv[] = { mode }" where mode=0x02 (multi-shot).

These branch expansions respectively correspond to the following nodes (cf. Fig. 2).

"YY" →
"00" (This is a don't-care byte. Let it be 00 for simplicity.) →
"01" →
"01" "0001" "02". (The last node may contain arguments to the command: argc followed by argv's.)

Fig. 2

Example 2: Start recording in video mode = "YY00021B0000\n".
This command string is obtained by clicking

"YY command" →
"* (don't care): extended YY command" →
"0x02: video" →
"0x1B: SET_CAMERA shutter button depressed. start recording; argc = 0x0000".

These branch expansions respectively correspond to the following nodes

"YY" →
"00" (don't care) →
"02" →
"1B" "0000". (There are zero arguments to the command but argument length.)

Example 3: Change video mode to 4K 30fps Wide = "YY0002030003010800\n".
This command string is obtained by clicking

"YY command" →
"* (don't care): extended YY command" →
"0x02: video" →
"0x03: SET_CAMERA video mode; argc = 0x0003; argv[] = { resolution, fps, fov }"

where resolution=0x01, fps=0x08, and fov=0x00.
These branch expansions respectively correspond to the following nodes

"YY" →
"00" (don't care) →
"02" →
"03" "0003" "01" "08" "00". (There are three arguments to the command.)

Example 4: Power off camera = "ZZ00030101\n".
This command string is obtained by clicking

"ZZ command" →
"0x00: extended ZZ command" →
"0x03: SET_CAMERA power off; argc = 0x01; argv[] = { 0x01 }".

These branch expansions respectively correspond to the following nodes

"ZZ" →
"00" →
"03" "01" "01". (There is one argument to the command.)

Note

In order to improve readability the following strings, for example, share the same meaning for MewPro Iliad and/or MewPro4 softwares.

ZZ00030101\n
ZZ 00 03 01 01\n (inserting arbitrary spaces at 8-bit boundary)
ZZ0 3 1 1\n (omitting upper nibble 0)

Useful Links

MewPro Iliad: Shop, Usage, GitHub repo
MewPro 2: Shop, Usage, GitHub repo