UIS7862 oled屏如何设置背光
oled屏如何设置背光
uboot阶段:
需要删除对sprd_bl.c的编译，在lcd驱动里面添加set_brightiness的接口，具体参考如下：
/bsp/bootloader/u-boot15/configs/uis7862s_xxx_defconfig
+ #define CONFIG_BACKLIGHT_DSI
/bsp/bootloader/u-boot15/board/spreadtrum/uis7862s_XXX/Makefile
- obj-y := uis7862s_1h10.o sdio_cfg.o sprd_kp.o modem_entry.o pinmap.o ldo_sleep.o sprd_bl.o regulator_init.o lcd_printf.o sprd_uart_matrix_cfg.o
+ obj-y := uis7862s_1h10.o sdio_cfg.o sprd_kp.o modem_entry.o pinmap.o ldo_sleep.o regulator_init.o lcd_printf.o sprd_uart_matrix_cfg.o
+ ifndef CONFIG_BACKLIGHT_DSI
+ obj-y +=sprd_bl.o
+ endif
添加set_brightness控制接口
/bsp/bootloader/u-boot15/drivers/video/sprd/lcd/lcd_xxx_xxx_xxx.c
static int xxx_set_brightness(int brightness)
{
unsigned char set_bl_seq[] = {0x51,0x0F,0XFF};
struct sprd_dsi *dsi = &dsi_device;
set_bl_seq= brightness >> 4 & 0x0F;
set_bl_seq= brightness;
mipi_dsi_gen_write(dsi, &set_bl_seq, 3);
return 0;
}
static struct panel_ops xxx_ops = {
++.set_brightness = xxx_set_brightness,
}
kernel阶段:
/bsp/kernel/kernel4.14/arch/arm64/boot/dts/sprd/uis7862s-xxxx.dts
--pwm_backlight: backlight {
-- compatible = "sprd,sharkl5pro-backlight";
-- pwms = <&pwms 0 40000>;
-- pwm-names = "backlight";
-- sprd,max-brightness-level = <880>;
-- default-brightness-level = <115>;
-- sprd,brightness-scale = <1023>;
-- };
-- &panel {
-- sprd,backlight = <&pwm_backlight>;
-- };
/bsp/kernel/kernel4.14/arch/arm64/configs/sprd_sharkl5Pro_defconfig
-- CONFIG_BACKLIGHT_PWM=y
++ #CONFIG_BACKLIGHT_PWM=y
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