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ctboard:peripherals:lcd [2016/02/25 12:31] – [Programming Example] feurctboard:peripherals:lcd [2017/08/29 09:25] (current) – [LCD] ruan
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 ====== LCD ====== ====== LCD ======
  
-The LCD character display can be used in three different ways: +The LCD character display can be used in two different ways: 
-  * Output ASCII characters over a simple LCD controller +  * Output [[lcd_ascii|ASCII characters]] over a simple LCD controller. 
-  * Output binary values in HEX representation (max. 128 bit) +  * Output [[lcd_bin|binary values]] in HEX representation (max. 128 bit). 
-  * Access the display directly over the I²C interface +Each RGB colour of the [[lcd_bg|background light]] is controlled by a 16 bit PWM controller. \\ \\
-Each colour of the background light is controlled by a 16 bit PWM controller. \\ \\ +
- +
-> {{ctboard:ctboard_mode_1.svg?48px }} {{ctboard:ctboard_mode_2.svg?48px }} {{ctboard:ctboard_mode_3.svg?48px }} Please make sure the CT Board is in the correct mode. +
-> Supported [[ctboard:mode_switch|modes]]: **1**, **2**, **3**  +
-\\ +
- +
-===== ASCII Interface ===== +
- +
-The integrated LCD controller must allways be accessed with 16 bit half words! \\ \\ +
- +
-==== Programming Example ==== +
- +
-The code snippet bellow shows how to use the ASCII interface of the LCD. +
- +
-<code c> +
-#include "reg_ctboard.h" +
- +
-CT_LCD->ASCII = (uint16_t) ((13u << 8u) | ascii_char);    /* Write ascii_char at position 13 on the LCD. */ +
-</code> +
-\\ +
- +
-<code asm> +
-ADDR_LCD_ASCII  EQU      0x60000310 +
- +
-                LDR      r0, =ADDR_LCD_ASCII +
-                LDR      r1, #13                          ; Load position on display into r1. +
-                LDR      r2, "E"                          ; Load value of ASCII char 'E' into r2. +
-                 +
-                ; Thumb instruction set +
-                LSLS     r1, #8                           ; Shift position 8 bits to the left +
-                ORRS     r2, r1                           ; Combine position with ASCII character +
-                 +
-                ; ARM instruction set +
-                ORRS     r2, r1, LSL #8                   ; Shift and combine position value with ASCII character +
-                 +
-                STRH     r2, [r0, #0]                     ; Write ascii_char at position 13 on the LCD. +
-</code> +
-\\ +
- +
-==== Registers ==== +
- +
-The Registers are read / write. +
- +
-\\ {{ctboard_lcd_ascii_reg.svg}} \\ \\ +
- +
-==== Display Positions ==== +
- +
-\\ {{ctboard_lcd_ascii.svg?700em}} \\ \\ +
- +
-===== Binary Interface ===== +
- +
-The binary interface can be used to display binary values in HEX representation. +
-A maximum of 128 bits can be displayed. \\ \\ +
- +
-==== Programming Example ==== +
- +
-The code snippet bellow shows how to use the ASCII interface of the LCD. +
- +
-<code c> +
-#include "reg_ctboard.h" +
- +
-CT_LCD->BIN.BYTE.B7_0 = (uint8_t) data_byte;           /* Write byte of data to LCD. */ +
-CT_LCD->BIN.HWORD.B31_16 = (uint16_t) data_halfword;   /* Write halfword of data to LCD. */ +
-CT_LCD->BIN.WORD.B63_32 = (uint32_t) data_word;        /* Write word of data to LCD. */ +
-CT_LCD->BIN.DWORD = (uint64_t) data_doubleword;        /* Write doubleword of data to LCD. */ +
-</code> +
-\\ +
- +
-<code asm> +
-ADDR_LCD_BIN    EQU      0x60000320 +
-                 +
-                LDR      r0, =ADDR_LCD_BIN +
-                STRB     r1, [r0, #0]                  ; Write byte of data to LCD. +
-                STRH     r1, [r0, #2]                  ; Write halfword of data to LCD. +
-                STR      r1, [r0, #4]                  ; Write word of data to LCD. +
-                STRD     r1, [r0, #0]                  ; Write doubleword of data to LCD. +
-</code> +
-\\ +
- +
-==== Registers ==== +
- +
-The Registers are read / write. +
- +
-\\ {{ctboard_lcd_bin_reg.svg}} \\ \\ +
- +
-==== Display Positions ==== +
- +
-\\ {{ctboard_lcd_bin.svg?700em}} \\ \\ +
- +
-===== I²C Interface ===== +
- +
-FIXME +
- +
-===== Background Light ===== +
- +
-Each colour of the background light is controlled by a 16 bit PWM generator. \\ +
-The brightness can be regulated from 0x0000 (0% / off) to 0xffff (100%). To adapt the brightness curve to the human eye a adadption to a logarithmic scale has to be done manually. \\ \\ +
- +
-==== Programming Example ==== +
- +
-The code snippet bellow shows 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> +
-\\ +
- +
-<code asm> +
-ADDR_LCD_BG     EQU      0x60000304 +
-                 +
-                LDR      r0, =ADDR_LCD_BG +
-                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> +
-\\ +
- +
-==== Registers ==== +
- +
-The Registers are read / write. +
- +
-\\ {{ctboard_lcd_pwm_reg.svg}} \\ \\+
  
 ===== Diagram ===== ===== Diagram =====
  
 \\ {{ctboard_lcd.svg?700em}} \\ \\ \\ {{ctboard_lcd.svg?700em}} \\ \\
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  • Last modified: 2016/02/25 12:31
  • by feur