LCD with Backlight
LCD is driven directly by CC430.
Prerequisites
Connection between CC430F6137 and LCD
Summary
| LCD_BOTTOM | CC430F6137 |
| COM3 COM2 COM1 COM0 | COM0 COM1 COM2 COM3 |
| SEG23 - SEG13 | S23 - S13 |
| LCD_TOP | |
| SEG12 | S12 |
| SEG11 | S9 |
| SEG10 | S11 |
| SEG9 | S10 |
| SEG8 - SEG6 | S8 - S6 |
| SEG5 | S1 |
| SEG4 - SEG1 | S5 - S2 |
| SEG0 | S0 |
| COM3 COM2 COM1 COM0 | COM0 COM1 COM2 COM3 |
LCD Driver
CC430F6137 has a 96-segment LCD driver (1,2,3,4 mux)Chronos has 4-mux LCD
LCD_B - LCD Driver
Generates the segment and common signals (AC) required to drive LCD
- Has dedicated data memories to hold segment drive information
- Has charge pump to provide LCD voltage (TODO - Not using it right now)
- Software can control the contrast
- by controlling the voltage level (TODO - Not using it right now)
- Automatic blinking capability for individual segments
- Recommended Operating Conditions & Electrical Characteristics [Datasheet - P63]
LCD_B Registers
Interrupt vector for LCD_B (TODO)
- Interrupt flag - LCDBIV
- maskable
- Word address - 0FFDEh
- Priority - 47
- range: 63 (Highest) -> 45 (Lowest)
To turn on an LCD segment, the corresponding memory bit must be set
- Memory can also be accessed word-wise - LCDM1, LCDM3, ...
Memory Control Register
LCDBMEMCTL
// Clear entire display memory LCDBMEMCTL |= LCDCLRBM + LCDCLRM;LCD Timing
f(lcd) = frequency of timing for common and segment lines
- Details - TODO
- FOr now, use the same frequency used in the sample code
// LCD_FREQ = ACLK/16/8 = 256Hz // Frame frequency = 256Hz/4 = 64Hz, LCD mux 4, LCD on LCDBCTL0 = (LCDDIV0 + LCDDIV1 + LCDDIV2 + LCDDIV3) | (LCDPRE0 + LCDPRE1) | LCD4MUX | LCDON;Clearing the LCD
LCDSON - set to 0 to turn off all the LCD segments
LCD Blinking
LCDBLKMODx - sets the blinking mode
LCDBMx registers - Memory to set the blinking for individual segment
- same structure as the Memory map above
- Details - TODO
// LCB_BLK_FREQ = ACLK/8/4096 = 1Hz LCDBBLKCTL = LCDBLKPRE0 | LCDBLKPRE1 | LCDBLKDIV0 | LCDBLKDIV1 | LCDBLKDIV2 | LCDBLKMOD0; Voltage and Bias settings
Options are available to select sources for voltage and bias generation - (TODO)
LCD Contrast control - TODO
LCD Output pins
No settings neccessary for dedicated LCD pins.
For the shared pins, need to set it to LCD rather than Digital I/O - TODO
// I/O to COM outputs P5SEL |= (BIT5 | BIT6 | BIT7); P5DIR |= (BIT5 | BIT6 | BIT7);Port Control Register
LCDBPCTLx
// Activate LCD output LCDBPCTL0 = 0xFFFF; // Select LCD segments S0-S15 LCDBPCTL1 = 0x00FF; // Select LCD segments S16-S22Initialization
Code from Chronos watch used to initialize the LCD.// *************************************************************************************************// @fn lcd_init// @brief Erase LCD memory. Init LCD peripheral.// @param none// @return none// *************************************************************************************************void lcd_init(void){ // Clear entire display memory LCDBMEMCTL |= LCDCLRBM + LCDCLRM; // LCD_FREQ = ACLK/16/8 = 256Hz // Frame frequency = 256Hz/4 = 64Hz, LCD mux 4, LCD on LCDBCTL0 = (LCDDIV0 + LCDDIV1 + LCDDIV2 + LCDDIV3) | (LCDPRE0 + LCDPRE1) | LCD4MUX | LCDON; // LCB_BLK_FREQ = ACLK/8/4096 = 1Hz LCDBBLKCTL = LCDBLKPRE0 | LCDBLKPRE1 | LCDBLKDIV0 | LCDBLKDIV1 | LCDBLKDIV2 | LCDBLKMOD0; // I/O to COM outputs P5SEL |= (BIT5 | BIT6 | BIT7); P5DIR |= (BIT5 | BIT6 | BIT7); // Activate LCD output LCDBPCTL0 = 0xFFFF; // Select LCD segments S0-S15 LCDBPCTL1 = 0x00FF; // Select LCD segments S16-S22#ifdef USE_LCD_CHARGE_PUMP // Charge pump voltage generated internally, internal bias (V2-V4) generation LCDBVCTL = LCDCPEN | VLCD_2_72;#endif}Location of Registers
LCDDIVx - LCD Frequency Divider
LCDPREx - LCD frequency pre-scaler
LCDSSEL - Clock source select for LCD and blinking frequency
LCDMXx - select the LCD mode.
LCDSON - LCD segments on.
LCDON - LCD on. This bit turns the LCD_B module on or off.
Control Register 1
LCDNOCAPIE
LCDBLKONIE
LCDBLKOFFIE
LCDFRMIE - Interrupt Enable bits
LCDNOCAPIFG
LCDBLKONIFG
LCDBLKOFFIFG
LCDFRMIFG - Interrupt flags
Blink Control Register
LCDBLKDIVx - Clock divider for blinking frequency
LCDBLKPREx - Clock pre-scaler for blinking frequency
LCDBLKMODx - Blinking mode
Memory Control Register
LCDCLRBM - Clear LCD blinking memory
LCDCLRM - Clear LCD memory. Clears all LCD memory registers LCDMx
LCDDISP - Select LCD memory registers for display
Voltage Control Register
VLCDx - Charge pump voltage select
VLCDEXT - VLCD source select
LCD2B - Bias select
LCDCPEN - Charge pump enable
etc.
Port Control Register 0 and 1
LCDSx - LCD segment line x enable. This bit affects only pins with multiplexed functions
LCDS27 to LCDS31 are reserved on devices supporting a maximum of 96 segments
Charge Pump Control Register
TODO
Interrupt Vector Register
LCDBIVx - LCD_B interrupt vector value
Writing to LCD
- need the memory locations
- then we need to know which bits to set for the displays we want
#define LCD_MEM_1 ((u8*)0x0A20)#define LCD_MEM_2 ((u8*)0x0A21)#define LCD_MEM_3 ((u8*)0x0A22)#define LCD_MEM_4 ((u8*)0x0A23)#define LCD_MEM_5 ((u8*)0x0A24)#define LCD_MEM_6 ((u8*)0x0A25)#define LCD_MEM_7 ((u8*)0x0A26)#define LCD_MEM_8 ((u8*)0x0A27)#define LCD_MEM_9 ((u8*)0x0A28)#define LCD_MEM_10 ((u8*)0x0A29)#define LCD_MEM_11 ((u8*)0x0A2A)#define LCD_MEM_12 ((u8*)0x0A2B)Aliases for all the different symbols
// Memory assignment#define LCD_SEG_L1_0_MEM (LCD_MEM_6)#define LCD_SEG_L1_1_MEM (LCD_MEM_4)#define LCD_SEG_L1_2_MEM (LCD_MEM_3)#define LCD_SEG_L1_3_MEM (LCD_MEM_2)#define LCD_SEG_L1_COL_MEM (LCD_MEM_1)#define LCD_SEG_L1_DP1_MEM (LCD_MEM_1)#define LCD_SEG_L1_DP0_MEM (LCD_MEM_5)#define LCD_SEG_L2_0_MEM (LCD_MEM_8)#define LCD_SEG_L2_1_MEM (LCD_MEM_9)#define LCD_SEG_L2_2_MEM (LCD_MEM_10)#define LCD_SEG_L2_3_MEM (LCD_MEM_11)#define LCD_SEG_L2_4_MEM (LCD_MEM_12)#define LCD_SEG_L2_5_MEM (LCD_MEM_12)#define LCD_SEG_L2_COL1_MEM (LCD_MEM_1)#define LCD_SEG_L2_COL0_MEM (LCD_MEM_5)#define LCD_SEG_L2_DP_MEM (LCD_MEM_9)#define LCD_SYMB_AM_MEM (LCD_MEM_1)#define LCD_SYMB_PM_MEM (LCD_MEM_1)#define LCD_SYMB_ARROW_UP_MEM (LCD_MEM_1)#define LCD_SYMB_ARROW_DOWN_MEM (LCD_MEM_1)#define LCD_SYMB_PERCENT_MEM (LCD_MEM_5)#define LCD_SYMB_TOTAL_MEM (LCD_MEM_11)#define LCD_SYMB_AVERAGE_MEM (LCD_MEM_10)#define LCD_SYMB_MAX_MEM (LCD_MEM_8)#define LCD_SYMB_BATTERY_MEM (LCD_MEM_7)#define LCD_UNIT_L1_FT_MEM (LCD_MEM_5)#define LCD_UNIT_L1_K_MEM (LCD_MEM_5)#define LCD_UNIT_L1_M_MEM (LCD_MEM_7)#define LCD_UNIT_L1_I_MEM (LCD_MEM_7)#define LCD_UNIT_L1_PER_S_MEM (LCD_MEM_5)#define LCD_UNIT_L1_PER_H_MEM (LCD_MEM_7)#define LCD_UNIT_L1_DEGREE_MEM (LCD_MEM_5)#define LCD_UNIT_L2_KCAL_MEM (LCD_MEM_7)#define LCD_UNIT_L2_KM_MEM (LCD_MEM_7)#define LCD_UNIT_L2_MI_MEM (LCD_MEM_7)#define LCD_ICON_HEART_MEM (LCD_MEM_2)#define LCD_ICON_STOPWATCH_MEM (LCD_MEM_3)#define LCD_ICON_RECORD_MEM (LCD_MEM_1)#define LCD_ICON_ALARM_MEM (LCD_MEM_4)#define LCD_ICON_BEEPER1_MEM (LCD_MEM_5)#define LCD_ICON_BEEPER2_MEM (LCD_MEM_6)#define LCD_ICON_BEEPER3_MEM (LCD_MEM_7)Masks for the symbols we have
// Bit masks for write access#define LCD_SEG_L1_0_MASK (BIT2+BIT1+BIT0+BIT7+BIT6+BIT5+BIT4)#define LCD_SEG_L1_1_MASK (BIT2+BIT1+BIT0+BIT7+BIT6+BIT5+BIT4)#define LCD_SEG_L1_2_MASK (BIT2+BIT1+BIT0+BIT7+BIT6+BIT5+BIT4)#define LCD_SEG_L1_3_MASK (BIT2+BIT1+BIT0+BIT7+BIT6+BIT5+BIT4)#define LCD_SEG_L1_COL_MASK (BIT5)#define LCD_SEG_L1_DP1_MASK (BIT6)#define LCD_SEG_L1_DP0_MASK (BIT2)#define LCD_SEG_L2_0_MASK (BIT3+BIT2+BIT1+BIT0+BIT6+BIT5+BIT4)#define LCD_SEG_L2_1_MASK (BIT3+BIT2+BIT1+BIT0+BIT6+BIT5+BIT4)#define LCD_SEG_L2_2_MASK (BIT3+BIT2+BIT1+BIT0+BIT6+BIT5+BIT4)#define LCD_SEG_L2_3_MASK (BIT3+BIT2+BIT1+BIT0+BIT6+BIT5+BIT4)#define LCD_SEG_L2_4_MASK (BIT3+BIT2+BIT1+BIT0+BIT6+BIT5+BIT4)#define LCD_SEG_L2_5_MASK (BIT7)#define LCD_SEG_L2_COL1_MASK (BIT4)#define LCD_SEG_L2_COL0_MASK (BIT0)#define LCD_SEG_L2_DP_MASK (BIT7)#define LCD_SYMB_AM_MASK (BIT1+BIT0)#define LCD_SYMB_PM_MASK (BIT0)#define LCD_SYMB_ARROW_UP_MASK (BIT2)#define LCD_SYMB_ARROW_DOWN_MASK (BIT3)#define LCD_SYMB_PERCENT_MASK (BIT4)#define LCD_SYMB_TOTAL_MASK (BIT7)#define LCD_SYMB_AVERAGE_MASK (BIT7)#define LCD_SYMB_MAX_MASK (BIT7)#define LCD_SYMB_BATTERY_MASK (BIT7)#define LCD_UNIT_L1_FT_MASK (BIT5)#define LCD_UNIT_L1_K_MASK (BIT6)#define LCD_UNIT_L1_M_MASK (BIT1)#define LCD_UNIT_L1_I_MASK (BIT0)#define LCD_UNIT_L1_PER_S_MASK (BIT3)#define LCD_UNIT_L1_PER_H_MASK (BIT2)#define LCD_UNIT_L1_DEGREE_MASK (BIT1)#define LCD_UNIT_L2_KCAL_MASK (BIT4)#define LCD_UNIT_L2_KM_MASK (BIT5)#define LCD_UNIT_L2_MI_MASK (BIT6)#define LCD_ICON_HEART_MASK (BIT3)#define LCD_ICON_STOPWATCH_MASK (BIT3)#define LCD_ICON_RECORD_MASK (BIT7)#define LCD_ICON_ALARM_MASK (BIT3)#define LCD_ICON_BEEPER1_MASK (BIT3)#define LCD_ICON_BEEPER2_MASK (BIT3)#define LCD_ICON_BEEPER3_MASK (BIT3)Table for the location and mask of each symbol
// Table with memory address for each display element const u8 * segments_lcdmem[] ={ LCD_SYMB_AM_MEM, LCD_SYMB_PM_MEM, LCD_SYMB_ARROW_UP_MEM, LCD_SYMB_ARROW_DOWN_MEM, LCD_SYMB_PERCENT_MEM, LCD_SYMB_TOTAL_MEM, LCD_SYMB_AVERAGE_MEM, LCD_SYMB_MAX_MEM, LCD_SYMB_BATTERY_MEM, LCD_UNIT_L1_FT_MEM, LCD_UNIT_L1_K_MEM, LCD_UNIT_L1_M_MEM, LCD_UNIT_L1_I_MEM, LCD_UNIT_L1_PER_S_MEM, LCD_UNIT_L1_PER_H_MEM, LCD_UNIT_L1_DEGREE_MEM, LCD_UNIT_L2_KCAL_MEM, LCD_UNIT_L2_KM_MEM, LCD_UNIT_L2_MI_MEM, LCD_ICON_HEART_MEM, LCD_ICON_STOPWATCH_MEM, LCD_ICON_RECORD_MEM, LCD_ICON_ALARM_MEM, LCD_ICON_BEEPER1_MEM, LCD_ICON_BEEPER2_MEM, LCD_ICON_BEEPER3_MEM, LCD_SEG_L1_3_MEM, LCD_SEG_L1_2_MEM, LCD_SEG_L1_1_MEM, LCD_SEG_L1_0_MEM, LCD_SEG_L1_COL_MEM, LCD_SEG_L1_DP1_MEM, LCD_SEG_L1_DP0_MEM, LCD_SEG_L2_5_MEM, LCD_SEG_L2_4_MEM, LCD_SEG_L2_3_MEM, LCD_SEG_L2_2_MEM, LCD_SEG_L2_1_MEM, LCD_SEG_L2_0_MEM, LCD_SEG_L2_COL1_MEM, LCD_SEG_L2_COL0_MEM, LCD_SEG_L2_DP_MEM,};
// Table with bit mask for each display element const u8 segments_bitmask[] ={ LCD_SYMB_AM_MASK, LCD_SYMB_PM_MASK, LCD_SYMB_ARROW_UP_MASK, LCD_SYMB_ARROW_DOWN_MASK, LCD_SYMB_PERCENT_MASK, LCD_SYMB_TOTAL_MASK, LCD_SYMB_AVERAGE_MASK, LCD_SYMB_MAX_MASK, LCD_SYMB_BATTERY_MASK, LCD_UNIT_L1_FT_MASK, LCD_UNIT_L1_K_MASK, LCD_UNIT_L1_M_MASK, LCD_UNIT_L1_I_MASK, LCD_UNIT_L1_PER_S_MASK, LCD_UNIT_L1_PER_H_MASK, LCD_UNIT_L1_DEGREE_MASK, LCD_UNIT_L2_KCAL_MASK, LCD_UNIT_L2_KM_MASK, LCD_UNIT_L2_MI_MASK, LCD_ICON_HEART_MASK, LCD_ICON_STOPWATCH_MASK, LCD_ICON_RECORD_MASK, LCD_ICON_ALARM_MASK, LCD_ICON_BEEPER1_MASK, LCD_ICON_BEEPER2_MASK, LCD_ICON_BEEPER3_MASK, LCD_SEG_L1_3_MASK, LCD_SEG_L1_2_MASK, LCD_SEG_L1_1_MASK, LCD_SEG_L1_0_MASK, LCD_SEG_L1_COL_MASK, LCD_SEG_L1_DP1_MASK, LCD_SEG_L1_DP0_MASK, LCD_SEG_L2_5_MASK, LCD_SEG_L2_4_MASK, LCD_SEG_L2_3_MASK, LCD_SEG_L2_2_MASK, LCD_SEG_L2_1_MASK, LCD_SEG_L2_0_MASK, LCD_SEG_L2_COL1_MASK, LCD_SEG_L2_COL0_MASK, LCD_SEG_L2_DP_MASK,};Index to refer to the above table
// ------------------------------------------// LCD symbols for easier access//// xxx_SEG_xxx = Seven-segment character (sequence 5-4-3-2-1-0)// xxx_SYMB_xxx = Display symbol, e.g. "AM" for ante meridiem // xxx_UNIT_xxx = Display unit, e.g. "km/h" for kilometers per hour// xxx_ICON_xxx = Display icon, e.g. heart to indicate reception of heart rate data// xxx_L1_xxx = Item is part of Line1 information // xxx_L2_xxx = Item is part of Line2 information// Symbols for Line1#define LCD_SYMB_AM 0#define LCD_SYMB_PM 1#define LCD_SYMB_ARROW_UP 2#define LCD_SYMB_ARROW_DOWN 3#define LCD_SYMB_PERCENT 4// Symbols for Line2#define LCD_SYMB_TOTAL 5#define LCD_SYMB_AVERAGE 6#define LCD_SYMB_MAX 7#define LCD_SYMB_BATTERY 8// Units for Line1#define LCD_UNIT_L1_FT 9#define LCD_UNIT_L1_K 10#define LCD_UNIT_L1_M 11#define LCD_UNIT_L1_I 12#define LCD_UNIT_L1_PER_S 13#define LCD_UNIT_L1_PER_H 14#define LCD_UNIT_L1_DEGREE 15// Units for Line2#define LCD_UNIT_L2_KCAL 16#define LCD_UNIT_L2_KM 17#define LCD_UNIT_L2_MI 18// Icons#define LCD_ICON_HEART 19#define LCD_ICON_STOPWATCH 20#define LCD_ICON_RECORD 21#define LCD_ICON_ALARM 22#define LCD_ICON_BEEPER1 23#define LCD_ICON_BEEPER2 24#define LCD_ICON_BEEPER3 25// Line1 7-segments#define LCD_SEG_L1_3 26#define LCD_SEG_L1_2 27#define LCD_SEG_L1_1 28#define LCD_SEG_L1_0 29#define LCD_SEG_L1_COL 30#define LCD_SEG_L1_DP1 31#define LCD_SEG_L1_DP0 32// Line2 7-segments#define LCD_SEG_L2_5 33#define LCD_SEG_L2_4 34#define LCD_SEG_L2_3 35#define LCD_SEG_L2_2 36#define LCD_SEG_L2_1 37#define LCD_SEG_L2_0 38#define LCD_SEG_L2_COL1 39#define LCD_SEG_L2_COL0 40#define LCD_SEG_L2_DP 41// Line1 7-segment arrays#define LCD_SEG_L1_3_0 70#define LCD_SEG_L1_2_0 71#define LCD_SEG_L1_1_0 72#define LCD_SEG_L1_3_1 73#define LCD_SEG_L1_3_2 74// Line2 7-segment arrays#define LCD_SEG_L2_5_0 90#define LCD_SEG_L2_4_0 91#define LCD_SEG_L2_3_0 92#define LCD_SEG_L2_2_0 93#define LCD_SEG_L2_1_0 94#define LCD_SEG_L2_5_2 95#define LCD_SEG_L2_3_2 96#define LCD_SEG_L2_5_4 97#define LCD_SEG_L2_4_2 98Display a symbol: Basic
//Clear segments related to symbolLCDMx &= ~(LCD_******_MASK + LCD_******_MASK + ...);//Write to the segmentsLCDMx |= (LCD_******_MASK + LCD_******_MASK + ...);Example: Display the heart symbol
source:
#include <cc430x613x.h>#include "lcd-writing.h"void main(void){ init_variables(); init_configure(); //turn on heart symbol LCDM2 &= ~LCD_ICON_HEART_MASK; //clear segments LCDM2 |= LCD_ICON_HEART_MASK; //write to segment while(1);}void init_variables(void){}void init_configure(void){ /* Initialize the stack pointer - done by cstartup.h */ /* Configure the watchdog */ WDTCTL = WDTPW | WDTHOLD; //stop watchdog timer /* Configure all ports */ /* Set up the clock - N/A */ /* Configure other peripherals */ //Configure LCD // Clear entire display memory LCDBMEMCTL |= LCDCLRBM + LCDCLRM; // LCD_FREQ = ACLK/16/8 = 256Hz // Frame frequency = 256Hz/4 = 64Hz, LCD mux 4, LCD on LCDBCTL0 = (LCDDIV0 + LCDDIV1 + LCDDIV2 + LCDDIV3) | (LCDPRE0 + LCDPRE1) | LCD4MUX | LCDON; // LCB_BLK_FREQ = ACLK/8/4096 = 1Hz LCDBBLKCTL = LCDBLKPRE0 | LCDBLKPRE1 | LCDBLKDIV0 | LCDBLKDIV1 | LCDBLKDIV2 | LCDBLKMOD0; // I/O to COM outputs P5SEL |= (BIT5 | BIT6 | BIT7); P5DIR |= (BIT5 | BIT6 | BIT7); // Activate LCD output LCDBPCTL0 = 0xFFFF; // Select LCD segments S0-S15 LCDBPCTL1 = 0x00FF; // Select LCD segments S16-S22}header:
#ifndef LCDWRITING_H_#define LCDWRITING_H_//Any debug flags//Prototypesvoid init_variables(void);void init_configure(void);//Memory map locations#define LCD_MEM_1 ((u8*)0x0A20)#define LCD_MEM_2 ((u8*)0x0A21)#define LCD_MEM_3 ((u8*)0x0A22)#define LCD_MEM_4 ((u8*)0x0A23)#define LCD_MEM_5 ((u8*)0x0A24)#define LCD_MEM_6 ((u8*)0x0A25)#define LCD_MEM_7 ((u8*)0x0A26)#define LCD_MEM_8 ((u8*)0x0A27)#define LCD_MEM_9 ((u8*)0x0A28)#define LCD_MEM_10 ((u8*)0x0A29)#define LCD_MEM_11 ((u8*)0x0A2A)#define LCD_MEM_12 ((u8*)0x0A2B)//aliases#define LCD_ICON_HEART_MEM (LCD_MEM_2)//masks#define LCD_ICON_HEART_MASK (BIT3)#endif /*LCDWRITING_H_*/Display a symbol: + pointers
//Pointer to the memory locationu8 * lcdmem = LCD_*****_MEM;u8 mask = (LCD_******_MASK + LCD_******_MASK + ...);//Clear segments*lcdmem = (u8) (*lcdmem & ~mask); //i.e. *lcdmem &= ~mask//Write segments*lcdmem = (u8) (*lcdmem | mask);Example updated
source:
#include <cc430x613x.h>#include "lcd-writing.h"u8* lcdmem;void main(void){ init_variables(); init_configure(); //turn on heart symbol lcdmem = LCD_ICON_HEART_MEM; *lcdmem &= ~LCD_ICON_HEART_MASK; //clear segments *lcdmem |= LCD_ICON_HEART_MASK; //write to segment while(1);}void init_variables(void){ lcdmem = 0;}void init_configure(void){ /* Initialize the stack pointer - done by cstartup.h */ /* Configure the watchdog */ WDTCTL = WDTPW | WDTHOLD; //stop watchdog timer /* Configure all ports */ /* Set up the clock - N/A */ /* Configure other peripherals */ //Configure LCD // Clear entire display memory LCDBMEMCTL |= LCDCLRBM + LCDCLRM; // LCD_FREQ = ACLK/16/8 = 256Hz // Frame frequency = 256Hz/4 = 64Hz, LCD mux 4, LCD on LCDBCTL0 = (LCDDIV0 + LCDDIV1 + LCDDIV2 + LCDDIV3) | (LCDPRE0 + LCDPRE1) | LCD4MUX | LCDON; // LCB_BLK_FREQ = ACLK/8/4096 = 1Hz LCDBBLKCTL = LCDBLKPRE0 | LCDBLKPRE1 | LCDBLKDIV0 | LCDBLKDIV1 | LCDBLKDIV2 | LCDBLKMOD0; // I/O to COM outputs P5SEL |= (BIT5 | BIT6 | BIT7); P5DIR |= (BIT5 | BIT6 | BIT7); // Activate LCD output LCDBPCTL0 = 0xFFFF; // Select LCD segments S0-S15 LCDBPCTL1 = 0x00FF; // Select LCD segments S16-S22}header:
#ifndef LCDWRITING_H_#define LCDWRITING_H_//typedefstypedef unsigned char u8;//Any debug flags//Prototypesvoid init_variables(void);void init_configure(void);//Memory map locations#define LCD_MEM_1 ((u8*)0x0A20)#define LCD_MEM_2 ((u8*)0x0A21)#define LCD_MEM_3 ((u8*)0x0A22)#define LCD_MEM_4 ((u8*)0x0A23)#define LCD_MEM_5 ((u8*)0x0A24)#define LCD_MEM_6 ((u8*)0x0A25)#define LCD_MEM_7 ((u8*)0x0A26)#define LCD_MEM_8 ((u8*)0x0A27)#define LCD_MEM_9 ((u8*)0x0A28)#define LCD_MEM_10 ((u8*)0x0A29)#define LCD_MEM_11 ((u8*)0x0A2A)#define LCD_MEM_12 ((u8*)0x0A2B)//aliases#define LCD_ICON_HEART_MEM (LCD_MEM_2)//masks#define LCD_ICON_HEART_MASK (BIT3)#endif /*LCDWRITING_H_*/Display a symbol: + table
(TODO) - already understand how things work
