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====== Driver Porting and Configuration ====== 
==== Porting I/O Control Driver ====
The I/O control driver is built as a module, can be used for controlling common peripherals, such as LED, push button, buzzer.

Copy [[http://dl.cubieboard.org/parteners/waveshare/Source_Code/a20-cubieboard-dvk/Driver%20and%20API/driver/|io_control_dev]] to your ubuntu system, compile it with your own system setting (refer to Appendix 1 "Compiling Driver Module"), and copy the generated io_control.ko file to the board, use the following command to load the driver module:
  $insmod  io_control.ko
Now you can start to try the I/O control API demo (refer to Appendix 2 "Running API Demo").

The buzzer can be shut up via configuring the related I/O port. Config the script.fex as follows: 
  [lcd0_para]
  lcd_gpio_0 = port:PH15<0><0><default><default>
Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]
Reboot the system to apply new configuration.


==== Porting Dallas’s 1-wire Driver ==== 
=== Config the Kernel === 
Config the kernel to include Dallas’s 1-wire(DS18B20) driver.
Under the root directory, enter the following commnad:
  #make menuconfig
(All the make menuconfig that follows in this document, is executed under root directory)

Config as follows:
  Device Drivers  --->
  <*> Dallas's 1-wire support  --->
      1-wire Bus Masters  --->
          <*> GPIO 1-wire busmaster
      1-wire Slaves  --->
          <*> Thermal family implementation

Save and exit, re-compile the kernel:
  #make uImage
Replace the earlier uImage on the board with the new generated uImage under arch/arm/boot/ directory via NFS. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]
=== Config the script.fex === 
Config the script.fex as follows, add the [w1_para] setting: 
  [w1_para]
  w1_used = 1
  w1_pin = port:PB10<1><default><default><default>
Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

Reboot the system, insert the DS18B20 device.

Copy [[http://dl.cubieboard.org/parteners/waveshare/Source_Code/a20-cubieboard-dvk/Driver%20and%20API/driver/|ds18b20_dev]] to your ubuntu system, compile it with your own system setting (refer to Appendix 1 "Compiling Driver Module"), and copy the generated w1-sun4i.ko file to the board, use the following command to load the driver:
  $insmod  w1-sun4i.ko

Enter the /sys/bus/w1/devices/w1_bus_master1 directory, there's a folder with the name preceding with "28-", which represents the DS18B20 device. The 28 means the current temperature sensor is DS18B20, the characters/numbers string follows stands for the device unique ID. Enter the folder, you should find it's device file named w1_slave, to get current temperature, enter this command on the terminal:
  $cat w1_slave
As shown in the picture below:

{{..:Documentations-6_1.jpg}}


==== Porting I2C Bus Driver ==== 
=== Config the Kernel === 
Config the kernel to include I2C bus driver: 
  #make menuconfig 
  Device Drivers  --->
  {*} I2C support  --->
    	  I2C Hardware Bus support  --->
       	  <*> Allwinner Technology SUNXI I2C interface
Save and exit.
Comment out lines 914 to 918 of the i2c-sunxi.c file, which is located in drivers/i2c/busses directory, as follows: 
  914 /*  else if (ret != num){
  915         printk("incomplete xfer (0x%x)\n", ret);
  916         ret = -ECOMM;
  917         //dev_dbg(i2c->adap.dev, "incomplete xfer (%d)\n", ret); 918     }*/
Save, and re-compile the kernel:
  #make uImage
Replace the earlier uImage on the board with the new generated uImage under arch/arm/boot/ directory via NFS. (for more info, refer to the document <4. Prepare for Kernel and Drivers Porting>)

=== Config the script.fex === 
Our AT24/FM24 module can be used to test the I2C driver, which is connected to the I2C1 controller. Therefore, config the [twi1_para] setting in the script.fex as follows: 
  [twi1_para]
  twi1_used = 1
  twi1_scl = port:PB18<2><default><default><default>
  twi1_sda = port:PB19<2><default><default><default>
Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

Reboot the system.

For more info about testing the AT24/FM24 module, like reading/writing data, please refer to the document [[tutorials:DVK521:Documentations:A20:DVK521 User Manual|DVK521 User Manual]] and Appendix 2 "Running API Demo".


==== Porting SPI Devices Driver ==== 
=== Config the Kernel === 
The A20 SPI is not natively supported by linux-sunxi-sunxi-3.4.61 kernel. You should copy the spi-sun7i.c file [[http://dl.cubieboard.org/parteners/waveshare/Source_Code/A20/driver%20source|spi-sun7i.c]] to the drivers/spi directory in the kernel, and modify the related Makefile and Kconfig under the same directory.

Add the following line in Makefile:
  obj-$(CONFIG_SPI_SUN7I)         += spi-sun7i.o
Add the following line in Kconfig:
  config SPI_SUN7I
     tristate "SUN7I SPI Controller"
     depends on ARCH_SUN7I
     help
         Allwinner Soc SPI controller,present on SUN7I chips．
         
  config SUN7I_SPI_NDMA
      bool "SUN7I SPI Normal DMA mode select"
      depends on SPI_SUN7I
      help
       　 This selects SPI DMA mode with DMA transfer
         Y select NDMA mode and N select DDMA mode

  #make menuconfig
  Device Drivers  --->
  [*] SPI support  --->
      <*>   SUN7I SPI Controller
  [*]     SUN7I SPI Normal DMA mode select
  <*>   DesignWare SPI controller core support 
  <*>   User mode SPI device driver support
Save and exit, re-compile the kernel:
  #make uImage
Replace the earlier uImage on the board with the new generated uImage under arch/arm/boot/ directory via NFS. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

=== Config the script.fex === 
Our SPI module AT45DBXX DataFlash Board is connected to the SPI0 controller, therefore, config the [spi0_para], [spi_devices], and [spi_board0] settings in the script.fex as follows: 
  [spi0_para]
  spi_used = 1
  spi_cs_bitmap = 1
  spi_cs0 = port:PI10<2><default><default><default>
  spi_cs1 = port:PI14<2><default><default><default>
  spi_sclk = port:PI11<2><default><default><default>
  spi_mosi = port:PI12<2><default><default><default>
  spi_miso = port:PI13<2><default><default><default>

  [spi_devices]
  spi_dev_num = 1

  [spi_board0]
  modalias = "spidev"
  max_speed_hz = 12000000
  bus_num = 0
  chip_select = 0
  mode = 3
  full_duplex = 0
  manual_cs = 0
Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

Now the kernel and script.fex configuration for SPI device have completed, the last step is to load the io_control.ko driver module (refer to the previous section " Porting I/O Control Driver").

Reboot the system.

Now you can use the AT45DBXX DataFlash Board to test the SPI driver (refer to Appendix 2 "Running API Demo").

==== Porting LCD Driver ==== 
=== Config the Kernel === 
The LCD driver support has been included in linux-sunxi-sunxi-3.4.61, the driver file can be found on drivers/video/sunxi/lcd.

Check the kernel configuration, confirm that the driver is included:
  #make menuconfig
  Device Drivers  --->
	Graphics support  --->
  {*} Support for frame buffer devices  --->
  <*>   DISP Driver Support(sunxi)
  -*-     Reserve memory block for sunxi/fb
  [*]     Enable FB/UMP Integration
  <*>    LCD Driver Support(sunxi)
  <*>       HDMI Driver Support(sunxi)
Save and exit, re-compile the kernel:
  #make uImage
Replace the earlier uImage on the board with the new generated uImage under arch/arm/boot/ directory via NFS. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

=== Config the script.fex === 
The A20 supports two channel video output, however, only LCD0 is available on Cubieboard, therefore, we connect the 7inch capacitive LCD to the LCD0 controller.

Config the script.fex, [dis_init] setting for display device initialization, and [lcd0_para] setting for LCD parameters (depending on the specifications of concrete LCD), as follows: 
  [disp_init]
  disp_init_enable = 1
  disp_mode = 0
  screen0_output_type = 1
  screen0_output_mode = 4
  screen1_output_type = 0
  screen1_output_mode = 4
  fb0_width = 1024
  fb0_height = 768
  fb0_framebuffer_num = 2
  fb0_format = 10
  fb0_pixel_sequence = 0
  fb0_scaler_mode_enable = 0
  fb1_width = 1024
  fb1_height = 768
  fb1_framebuffer_num = 2
  fb1_format = 10
  fb1_pixel_sequence = 0
  fb1_scaler_mode_enable = 0
  lcd0_backlight = 197
  lcd1_backlight = 197
  lcd0_bright = 50
  lcd0_contrast = 50
  lcd0_saturation = 57
  lcd0_hue = 50
  lcd1_bright = 50 
  lcd1_contrast = 50
  lcd1_saturation = 57
  lcd1_hue = 50

  [lcd0_para]
  lcd_used = 1
  lcd_x = 800 
  lcd_y = 480
  lcd_dclk_freq = 33
  lcd_pwm_not_used = 0
  lcd_pwm_ch = 0
  lcd_pwm_freq = 10000
  lcd_pwm_pol = 0
  lcd_max_bright = 240
  lcd_min_bright = 64
  lcd_if = 0
  lcd_hbp = 215
  lcd_ht = 1055
  lcd_vbp = 34
  lcd_vt = 1050
  lcd_vspw = 3
  lcd_hspw = 20
  lcd_hv_if = 0
  lcd_hv_smode = 0
  lcd_hv_s888_if = 0
  lcd_hv_syuv_if = 0
  lcd_lvds_ch = 0
  lcd_lvds_mode = 0
  lcd_lvds_bitwidth = 0
  lcd_lvds_io_cross = 0
  lcd_cpu_if = 0
  lcd_frm = 1
  lcd_io_cfg0 = 0
  lcd_gamma_correction_en = 0
  lcd_gamma_tbl_0 = 0x0
  lcd_gamma_tbl_1 = 0x10101
  lcd_gamma_tbl_255 = 0xffffff
  lcd_bl_en_used = 1
  lcd_bl_en = port:PH07<1><0><default><1>
  lcd_power_used = 1
  lcd_power = port:PH08<1><0><default><1>
  lcd_pwm_used = 1
  lcd_pwm = port:PB02<2><0><default><default>
  lcd_gpio_0 = port:PH15<0><0><default><default>
  lcd_gpio_1 =
  lcd_gpio_2 =
  lcd_gpio_3 =
  lcdd0 = port:PD00<2><0><default><default>
  lcdd1 = port:PD01<2><0><default><default>
  lcdd2 = port:PD02<2><0><default><default>
  lcdd3 = port:PD03<2><0><default><default>
  lcdd4 = port:PD04<2><0><default><default>
  lcdd5 = port:PD05<2><0><default><default>
  lcdd6 = port:PD06<2><0><default><default>
  lcdd7 = port:PD07<2><0><default><default>
  lcdd8 = port:PD08<2><0><default><default>
  lcdd9 = port:PD09<2><0><default><default>
  lcdd10 = port:PD10<2><0><default><default>
  lcdd11 = port:PD11<2><0><default><default>
  lcdd12 = port:PD12<2><0><default><default>
  lcdd13 = port:PD13<2><0><default><default>
  lcdd14 = port:PD14<2><0><default><default>
  lcdd15 = port:PD15<2><0><default><default>
  lcdd16 = port:PD16<2><0><default><default>
  lcdd17 = port:PD17<2><0><default><default>
  lcdd18 = port:PD18<2><0><default><default>
  lcdd19 = port:PD19<2><0><default><default>
  lcdd20 = port:PD20<2><0><default><default>
  lcdd21 = port:PD21<2><0><default><default>
  lcdd22 = port:PD22<2><0><default><default>
  lcdd23 = port:PD23<2><0><default><default>
  lcdclk = port:PD24<2><0><default><default>
  lcdde = port:PD25<2><0><default><default>
  lcdhsync = port:PD26<2><0><default><default>
  lcdvsync = port:PD27<2><0><default><default>

Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document <4. Prepare for Kernel and Drivers Porting>)

Reboot the system, the LCD should be ready to work.


==== Porting CTP Driver ==== 
=== Config the Kernel === 
Our capacitive touch screen integrates FT5206 as the touch controller,  and the related driver file is ft5x_ts.c. Unfortunately the original ft5x_ts.c in linux-sunxi-sunxi-3.4.61 kernel doesn’t support A20, therefore, copy the new ft5x_ts.c [[http://dl.cubieboard.org/parteners/waveshare/Source_Code/A20/driver%20source/|ft5x_ts.c]] to the drivers/input/touchscreen directory in kernel and replace the original one. Besides, the touch screen interrupt pin ctp_int_port requires GPIO interrupts, make sure the GPIO driver is included when configuring.

Config the Kernel to include touchscreen driver:
  #make menuconfig
  Device Drivers  --->
  Input device support  --->
  [*]   Touchscreens  --->
  <*>   ft5x touchscreen driver
  
  Device Drivers  --->
  [*] GPIO Support  --->
  <*>   GPIO Support for sunxi platform

Re-compile the kernel:
  #make uImage
Replace the earlier uImage on the board with the new generated uImage under arch/arm/boot/ directory via NFS. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

=== Config the script.fex === 
Since the touch screen is connected to I2C1 controller, make sure the I2C driver has been ported (refer to the previous section "Porting I2C Bus Driver").
Config the [ctp_para],[ctp_list_para],and[gpio_para] setting in script.fex.  
  ctp_name：driver name
  ctp_twi_id：I2C controller which is actually used
  ctp_twi_addr：I2C device address (7bit)
  ctp_screen_max_x：touch panel resolution
  ctp_screen_max_y：touch panel resolution
  ctp_revert_x_flag：set 1 to revert x axis
  ctp_revert_y_flag：set 1 to revert y axis
  ctp_exchange_x_y_flag：set 1 to exchange x axis and y axis
  ctp_int_port：touch interrupt pin
  ctp_wakeup：touch wakeup pin
  ctp_io_port：interrupt pin configuration

According to the specifications and hardware connection of our 7inch capacitive LCD, config as follows:
  [ctp_para]
  ctp_used = 1
  ctp_name = "ft5x_ts"
  ctp_twi_id = 1
  ctp_twi_addr = 0x38
  ctp_screen_max_x = 800
  ctp_screen_max_y = 480
  ctp_revert_x_flag = 0
  ctp_revert_y_flag = 1
  ctp_exchange_x_y_flag = 0
  ctp_firm = 1
  ctp_wakeup = port:PB13<1><default><default><1>
  
  [ctp_list_para]
  ctp_det_used = 1
  ft5x_ts = 1
  gt82x = 0
  gslX680 = 0
  gt9xx_ts = 0
  gt811 = 0
  
  [gpio_para]
  gpio_pin_3 = port:PH07<6><default><default><default> 

Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

Connect the 7inch capacitive LCD, reboot the system, try to touch the icons on the screen. 
      
==== Porting VGA Driver ====
VAG driver has been includes in the kernel, just config the script.fex directly:
  [disp_init]
  disp_init_enable = 1
  disp_mode = 0
  screen0_output_type = 4
  screen0_output_mode = 4
  screen1_output_type = 0
  screen1_output_mode = 4
  fb0_width = 1024
  fb0_height = 768
  fb0_framebuffer_num = 2
  fb0_format = 10
  fb0_pixel_sequence = 0
  fb0_scaler_mode_enable = 0
  fb1_width = 1024
  fb1_height = 768
  fb1_framebuffer_num = 2
  fb1_format = 10
  fb1_pixel_sequence = 0
  fb1_scaler_mode_enable = 0
  lcd0_backlight = 197
  lcd1_backlight = 197
  lcd0_bright = 50
  lcd0_contrast = 50
  lcd0_saturation = 57
  lcd0_hue = 50
  lcd1_bright = 50
  lcd1_contrast = 50
  lcd1_saturation = 57
  lcd1_hue = 50

Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document <4. Prepare for Kernel and Drivers Porting>)
Reboot the system, now the VGA can be used for displaying.
 
==== Porting HDMI Driver ==== 
HDMI driver has been includes in the kernel, just config the script.fex directly:
  [disp_init]
  disp_init_enable = 1
  disp_mode = 0
  screen0_output_type = 3
  screen0_output_mode = 5
  screen1_output_type = 0
  screen1_output_mode = 4
  fb0_width = 1024
  fb0_height = 768
  fb0_framebuffer_num = 2
  fb0_format = 10
  fb0_pixel_sequence = 0
  fb0_scaler_mode_enable = 0
  fb1_width = 1024
  fb1_height = 768
  fb1_framebuffer_num = 2
  fb1_format = 10
  fb1_pixel_sequence = 0
  fb1_scaler_mode_enable = 0
  lcd0_backlight = 197
  lcd1_backlight = 197
  lcd0_bright = 50
  lcd0_contrast = 50
  lcd0_saturation = 57
  lcd0_hue = 50
  lcd1_bright = 50
  lcd1_contrast = 50
  lcd1_saturation = 57
  lcd1_hue = 50

Reboot the system, now the HDMI can be used for displaying.

==== Porting CSI Driver === 
=== Config the Kernel === 
  #make menuconfig
  Device Drivers  --->
     <*> Multimedia support  --->
        <*>   Video For Linux
        [*]   CSI Driver Config for sun4i  --->
            <M>   OmniVision OV7670 sensor support

Built the camera driver as module, save and exit.

Comment out the print messages in the __s32 img_sw_para_to_reg(__u8 type, __u8 mode, __u8 value) function in disp_layer.c file, which is under drivers/video/sunxi/disp directory.

Lines 95 to 99:
  95 /*      else {
  96            DE_WRN("not supported yuv channel format:%d in "
  97                    "img_sw_para_to_reg\n", value);
  98             return 0;
  99         }*/
Lines 125 to 129:
  125 /*      else {
  126         DE_WRN("not supported yuv channel pixel sequence:%d "
  127                    "in img_sw_para_to_reg\n", value);
  128             return 0;
  129         }*/
Lines 168 to 172:
  168 /*      else {
  169          DE_WRN("not supported image0 pixel sequence:%d in "
  170                    "img_sw_para_to_reg\n", value);
  171             return 0;
  172         }*/
Line 175:
  175 //  DE_WRN("not supported type:%d in img_sw_para_to_reg\n", type);
Save, re-compile the kernel:
  #make uImage
Compile the kernel modules:
  #make modules
Install the kernel modules:
  #make modules_install
The installation copies the compiled kernel module from the kernel source code to the ubuntu /lib/modules directory.

The related driver module files include: videobuf-core.ko, videobuf-dma-contig.ko, sun4i_csi1.ko, ov7670.ko, which are located respectively in: 
  videobuf-core.ko, videobuf-dma-contig.ko:
  /lib/modules/3.4.61+/kernel/drivers/media/video
  ov7670.ko:
  /lib/modules/3.4.61+/kernel/drivers/media/video/sun4i_csi/device
  sun4i_csi1.ko:
  /lib/modules/3.4.61+/kernel/drivers/media/video/sun4i_csi/csi1
Replace the earlier uImage on the board with the new generated uImage under arch/arm/boot/ directory via NFS. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

Copy the above 4 driver files to the board, and install them in order: 
  $insmod  videobuf-core.ko
  $insmod  videobuf-dma-contig.ko
  $insmod  ov7670.ko
  $insmod  sun4i_csi1.ko
Note: please pay attention to the installing order, camera driver should be installed before sun4i_csi1.ko. 

=== Config the script.fex === 
Since our OV7670 camera is connected to the CSI1 controller, config the [csi1_para] and [camera_list_para] setting in script.fex.  The suffix _b in the parameter name indicates that this is a secondary camera parameter while two cameras were connected to the same CSI.

The parameters are interpreted as follows:
  csi_used = xx：enable/disable csi0 or csi1
  csi_mode = xx：CSI receiver buffer mode:
  0：a stand-alone buffer for each CSI receiver 
  1：a shared buffer for both CSI receiver
  csi_dev_qty = xx：CSI device quantity, 1 or 2
  csi_stby_mode = xx：standby power statue
  0：power on when standby
  1：power off when standby 
  csi_mname = “xxx”： CSI module name, matches with the driver, valid option includes: ov7670/gc0308/gt2005/hi704/sp0338/mt9m112/gc0307/mt9m113/mt9d112/hi253/ov5640 
  csi_twi_id = xx：I2C
  csi_twi_addr = xx：I2C address
  csi_if = xx：interface timing:
  0:8bit data line, with Hsync,Vsync 
  1:16bit data line, with Hsync,Vsync 
  2:24bit data line, with Hsync,Vsync 
  3:8bit data line, BT656 embedded sync, single-channel
  4:8bit data line, BT656 embedded sync, dual-channels
  5:8bit data line, BT656 embedded sync, four-channels
  csi_vflip = xx：video vertical flip
  0：normal
  1：flip
  csi_hflip = xx：video horizontal flip
  0：normal
  1：flip
  csi_iovdd = "", csi_avdd = "", and csi_dvdd = ""： power supply of the camera module's IO, Analog, and Core.
  "axp20_pll": powering from AXP20 LDO3
  "axp20_hdmi": powering from AXP20 LDO4
  "": powering from other source
  csi_flash_pol = xx：flash polarity for cameras that feature flash IO control
  0: flash lights when IO low level
  1: flash lights when IO high level
  csi_pck = xx：GPIO configuration for clock signal from module to CSI
  csi_ck = xx：GPIO configuration for clock signal from CSI to module
  csi_hsync = xx：GPIO configuration for horizontal sync signal from module to CSI
  csi_vsync = xx：GPIO configuration for vertical sync signal from module to CSI
  csi_d0 = xx to csi_d15 = xx：GPIO configuration for 8bit/16bit data from module to CSI
  csi_reset = xx：GPIO configuration for module reset 
  csi_power_en = xx：GPIO configuration for module power, high active by default
  csi_stby = xx：GPIO configuration for module standby
  csi_af_en = xx：GPIO configuration for module AF power

The details configuration:
  [csi1_para]
  csi_used = 1
  csi_dev_qty = 1
  csi_stby_mode = 0
  csi_mname = "ov7670"
  csi_if = 0
  csi_iovdd = "axp20_pll"
  csi_avdd = ""
  csi_dvdd = ""
  csi_vol_iovdd = 2800
  csi_vol_dvdd =
  csi_vol_avdd =
  csi_vflip = 1
  csi_hflip = 0
  csi_flash_pol = 1
  csi_facing = 1
  csi_twi_id = 1
  csi_twi_addr = 0x42
  csi_pck = port:PG00<3><default><default><default>
  csi_ck = port:PG01<3><default><default><default>
  csi_hsync = port:PG02<3><default><default><default>
  csi_vsync = port:PG03<3><default><default><default>
  csi_d0 = port:PG04<3><default><default><default>
  csi_d1 = port:PG05<3><default><default><default>
  csi_d2 = port:PG06<3><default><default><default>
  csi_d3 = port:PG07<3><default><default><default>
  csi_d4 = port:PG08<3><default><default><default>
  csi_d5 = port:PG09<3><default><default><default>
  csi_d6 = port:PG10<3><default><default><default>
  csi_d7 = port:PG11<3><default><default><default>
  csi_reset = port:PH13<1><default><default><0>
  csi_power_en = port:PH16<1><default><default><0>
  csi_stby = port:PH19<1><default><default><0>

  [camera_list_para]
  camera_list_para_used = 1
  ov7670 = 1
  gc0308 = 0
  gt2005 = 0
  hi704 = 0
  sp0838 = 0
  mt9m112 = 0
  mt9m113 = 0
  ov2655 = 0
  hi253 = 0
  gc0307 = 0
  mt9d112 = 0
  ov5640 = 0
  gc2015 = 0
  ov2643 = 0
  gc0329 = 0
  gc0309 = 0
  tvp5150 = 0
  s5k4ec = 0
  ov5650_mv9335 = 0
  siv121d = 0
  gc2035 = 0

Then convert it into script.bin format by using fex2bin, and replace the earlier script.bin on the board. (for more info, refer to the document [[tutorials:DVK521:Documentations:A20:Prepare for Kernel and Drivers Porting|Prepare for Kernel and Drivers Porting]]

Connect the OV7670 camera module and the LCD to the board, reboot the system.

Now you can start to try the camera API demo (refer to Appendix 2 "Running API Demo").

==== Appendix 1: Compiling Driver Module ==== 
The provided xx.ko files under [[http://dl.cubieboard.org/parteners/waveshare/Source_Code/a20-cubieboard-dvk/Driver%20and%20API/driver/|Driver]] is compiled to run on our system image only.

If the drivers are going to being loaded on your own system, they need to be re-compiled according to you system kernel path.

Use the io_control_dev.ko for demonstration.

1.1 Copy the [[http://dl.cubieboard.org/parteners/waveshare/Source_Code/a20-cubieboard-dvk/Driver%20and%20API/driver/|io_control_dev]] to ubuntu, assume the target directory is /home/waveshare/cubieboard2/waveshare_demo/driver .
Modify the files permission:
  #cd /home/waveshare/cubieboard2/waveshare_demo/driver/io_control_dev
{{:tutorials:dvk521:documentations:a20:a20_6_1.jpg}}
  #chmod 777 ./*
  
1.2 Modify the Makefile
  #vi Makefile
{{:tutorials:dvk521:documentations:a20:a20_6_2.jpg}}

Assign the KERNELDIR according to your actual kernel path. 

1.3 Clear the old files
  #make clean
{{:tutorials:dvk521:documentations:a20:a20_6_3.jpg}}

1.4 Compile
  #make
  
An error might occur while compiling:
  io_control.c:1:23: fatal error: linux/init.h: No such file or directory
  compilation terminated.
  make: *** [modules] Error 1
As shown in the picture below:

{{:tutorials:dvk521:documentations:a20:a20_6_4.jpg}}

It is caused by the different kernel version, can be just omitted.
{{:tutorials:dvk521:documentations:a20:a20_6_5.jpg}}

Copy the new generated io_control.ko file to your own system and load it. 

==== Appendix 2 "Running API Demo" ====
When the driver has been loaded, you can start to try the API demo.

Copy the API source code to your ubuntu, and modify the files permission: 
  #chmod 777 ./*
Execute the following command to compile:
  #make
Then copy the executable file to the board, say, "test_led", use the following command to run it:
  #./ test_led
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