To get OV5640 working for your Allwinner H3 based board:
Step 1. Update the fex file
The file is usually located in /boot directory, name could be script.bin or *.bin depends on the os.
Use bin2fex to convert the bin file to fex file. (If you don't have fex2bin, do "apt install sunxi-tools")
the fex file is just a text file, search for "[csi0]", it stands for Camera Serial Interface 0.
if you are using Orange Pi Zero Plus2 H3 board with OV5640 camera, you can use the following setting, if you are using a different board, you need to check the board schematic to make sure the pins(port:Pxnn<n><default><default><default>) defined in the fex file are in line with what's in the schematic(you can refer to my previous post in this thread on where in the schematic to check) and update them accordingly.
twi address(vip_dev0_twi_addr), voltage settings(vip_dev1_iovdd_vol,vip_dev1_avdd_vol,vip_dev1_dvdd_vol,vip_dev1_afvdd_vol) are described in OV5640 datasheet(8.3 DC characteristics https://cdn.sparkfun.com/datasheets/Sensors/LightImaging/OV5640_datasheet.pdf).
Once done, use fex2bin to convert the fex file to bin file. Reboot the board to load the updated bin file.
[csi0]
vip_used = 1
vip_mode = 0
vip_dev_qty = 1
vip_define_sensor_list = 0
vip_csi_pck = port:PE00<2><default><default><default>
vip_csi_mck = port:PE01<2><default><default><default>
vip_csi_hsync = port:PE02<2><default><default><default>
vip_csi_vsync = port:PE03<2><default><default><default>
vip_csi_d0 = port:PE04<2><default><default><default>
vip_csi_d1 = port:PE05<2><default><default><default>
vip_csi_d2 = port:PE06<2><default><default><default>
vip_csi_d3 = port:PE07<2><default><default><default>
vip_csi_d4 = port:PE08<2><default><default><default>
vip_csi_d5 = port:PE09<2><default><default><default>
vip_csi_d6 = port:PE10<2><default><default><default>
vip_csi_d7 = port:PE11<2><default><default><default>
vip_csi_sck = port:PE12<2><default><default><default>
vip_csi_sda = port:PE13<2><default><default><default>
vip_dev0_mname = "ov5640"
vip_dev0_pos = "rear"
vip_dev0_lane = 2
vip_dev0_twi_id = 2
vip_dev0_twi_addr = 120
vip_dev0_isp_used = 0
vip_dev0_fmt = 0
vip_dev0_stby_mode = 0
vip_dev0_vflip = 1
vip_dev0_hflip = 1
vip_dev0_iovdd = ""
vip_dev0_iovdd_vol = 1800000
vip_dev0_avdd = ""
vip_dev0_avdd_vol = 2800000
vip_dev0_dvdd = ""
vip_dev0_dvdd_vol = 1500000
vip_dev0_afvdd = ""
vip_dev0_afvdd_vol = 0
vip_dev0_power_en = port:PA08<1><default><default><default>
vip_dev0_reset = port:PE14<1><default><default><default>
vip_dev0_pwdn = port:PE15<1><default><default><default>
vip_dev0_flash_en =
vip_dev0_flash_mode =
vip_dev0_af_pwdn =
vip_dev0_act_used = 0
vip_dev0_act_name = "ad5820_act"
vip_dev0_act_slave = 24
vip_dev1_mname = ""
vip_dev1_pos = "front"
vip_dev1_lane = 1
vip_dev1_twi_id = 0
vip_dev1_twi_addr =
vip_dev1_isp_used = 0
vip_dev1_fmt = 1
vip_dev1_stby_mode = 0
vip_dev1_vflip = 0
vip_dev1_hflip = 0
vip_dev1_iovdd = ""
vip_dev1_iovdd_vol = 2800000
vip_dev1_avdd = ""
vip_dev1_avdd_vol = 2800000
vip_dev1_dvdd = ""
vip_dev1_dvdd_vol = 1500000
vip_dev1_afvdd = ""
vip_dev1_afvdd_vol = 2800000
vip_dev1_power_en =
vip_dev1_reset =
vip_dev1_pwdn =
vip_dev1_flash_en =
vip_dev1_flash_mode =
vip_dev1_af_pwdn =
Step 2. Load the drivers
modprobe ov5640
modprobe vfe_v4l2
check dmesg, the normal log should look like this:
[ 24.397287] [OV5640@lex]init_sensor - frame_rate: 0, max_win_size: 11
[ 35.772109] [OV5640@lex]CSI_SUBDEV_PWR_ON!
[ 35.849649] [OV5640@lex]sensor_init 0x0
[ 35.897182] [OV5640@lex]CSI_SUBDEV_STBY_ON!
[ 35.906344] [OV5640@lex]sensor_s_release_af
[ 35.927791] [OV5640@lex]disalbe oe!
At this point you should have a working /dev/video0
