AddNew屏幕BacklightDriver

Adding a new screen backlight driver is mainly divided into：

  1. Add macro definitions for the driver IC in the Kconfig file

  2. Copy similar driver code and add it to the compilation

  3. Modify the copied driver file

Add macro definitions for the driver IC in the Kconfig file

Open the SDK\customer\peripherals\Kconfig file and find the definition of other backlights，Such asBL_USING_AW9364的config，Add a new config afterward(For exampleJoin的ICNameForNW9527)：

config BL_USING_NW9527
    def_bool n

Copy similar driver code and add it to the compilation

  • Find the aw9364 directory under SDK\customer\peripherals，

  • Copy the entire directory and rename it to “nw9527”

  • Inside的Driver.cFile也Change成nw9527.c, 并ModifyInside的Content。

  • Inside的SConscriptFile中的dependMacroChange to前面Add的BL_USING_NW9527，Let新加的FileJoinCompile

Modify the copied driver file

Here is an example of the aw9364 backlight driver：

Initialize

In the aw9364_init function, initialize the control pin LCD_BACKLIGHT_CONTROL_PIN as a GPIO output and set it to low (turn off the backlight)。

Set backlight brightness

In the callback function backligt_set, convert the brightness percentage passed down from the upper layer（Based on the brightness level supported by the backlight IC），Then pass it to the sif_aw9364_set_backlight function to set the brightness。

Read backlight brightness

In the callback function backligt_get, use the variable aw9364_bl to return the brightness because this backlight chip does not support reading the brightness level。