====== LCD Background Light ======

Each RGB colour of the background light is controlled by an individual 16 bit PWM generator. \\
The brightness of each RGB colour can be regulated from 0x0000 (0% / off) to 0xffff (100%). To adapt the brightness curve to the human eye an adaption to a logarithmic scale has to be done manually. \\ \\

> {{ctboard:ctboard_mode_1.svg?48px }} {{ctboard:ctboard_mode_2.svg?48px }} {{ctboard:ctboard_mode_3.svg?48px }} {{ctboard:ctboard_mode_4.svg?48px }} Please make sure the CT Board is in the correct mode.
> Supported [[ctboard:mode_switch|modes]]: **1**, **2**, **3**, **4** 
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===== Registers =====

The Registers are read / write.

\\ {{ctboard_lcd_pwm_reg.svg}} \\ \\

===== Programming Example =====

The code snippets below show how to set the background light on the LCD.

<code c>
#include "reg_ctboard.h"

CT_LCD->BG.RED = (uint16_t) data_halfword;        /* Set PWM value for red background light. */
CT_LCD->BG.GREEN = (uint16_t) data_halfword;      /* Set PWM value for green background light. */
CT_LCD->BG.BLUE = (uint16_t) data_halfword;       /* Set PWM value for blue background light. */
</code>
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<code asm>
ADDR_LCD_BG     EQU      0x60000340
                
                LDR      r0, =ADDR_LCD_BG
                LDR      r1, =0xffff
                STRH     r1, [r0, #0]             ; Set PWM value for red background light.
                STRH     r1, [r0, #2]             ; Set PWM value for green background light.
                STRH     r1, [r0, #4]             ; Set PWM value for blue background light.
</code>
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