Main funngsi menyalakan LCD 16*4
/*
* main.c
*
* STM32F4 Character LCD demo, by: Tom McLeod
*
* This code is used to test a character LCD interface with the STM32F4.
*
* If you end up using this code please let me know!
*
* THIS CODE IS PROVIDED AS IS, WITH NO WARRANTY. Please see the LICENSE file
* in the projects root directory for more info.
*
*/
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "charlcd.h"
GPIO_InitTypeDef GPIO_InitStructure;
void delay(float time);
int main(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE); // Start clock on GPIOD
// This configures the Discovery LED pins D(12-15)
// 12 = green/left
// 13 = orange/top
// 14 = red/right
// 15 = blue/bottom
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
CharLCD_Config();
CharLCD_Init();
//CharLCD_Clear();
// Enable FPU :D
// Not really used in this case, but doesn't hurt and proves that it works to
// some degree.
SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2));
CharLCD_SetCursor(1,1);
CharLCD_WriteLineWrap("Hello World!");
CharLCD_SetCursor(2,1);
CharLCD_WriteLineWrap("STM32F4 example by: Tom McLeod");
//CharLCD_SetCursor(3,1);
//CharLCD_WriteLineWrap("Tom McLeod");
CharLCD_SetCursor(4,1);
//CharLCD_WriteLineWrap("!@#$%^&*()");
//CharLCD_Test();
/* You have to put in the data for each custom character line by line,
* this character looks like this:
* ___________
* | | | | | | 0x00
* | | | | | | 0x00
* | |x| |x| | 0x0A (hex for 01010, 1's where you want pixels lit)
* | | | | | | 0x00
* |x| | | |x| 0x11
* | |x|x|x| | 0x0E
* | | | | | | 0x00
* | | | | | | 0x00
* -----------
*
* a helpful editor for these can be found online here:
* http://www.quinapalus.com/hd44780udg.html
*/
CustomCharacter smiley;
smiley.number = 0;
smiley.line[0] = 0x00;
smiley.line[1] = 0x00;
smiley.line[2] = 0x0A;
smiley.line[3] = 0x00;
smiley.line[4] = 0x11;
smiley.line[5] = 0x0E;
smiley.line[6] = 0x00;
smiley.line[7] = 0x00;
CharLCD_SendCustom(&smiley);
CharLCD_WriteCustom(&smiley);
CharLCD_WriteLineNoWrap("<--Custom Character");
while (1)
{
GPIO_SetBits(GPIOD,GPIO_Pin_12); // Turn on green
delay(0xFFFFF);
GPIO_SetBits(GPIOD,GPIO_Pin_13); // Turn on orange
delay(0xFFFFF);
GPIO_SetBits(GPIOD,GPIO_Pin_14); // Turn on red
delay(0xFFFFF);
GPIO_SetBits(GPIOD,GPIO_Pin_15); // Turn on blue
delay(0xFFFFF);
// Turn all off
GPIO_ResetBits(GPIOD,GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
delay(0xFFFFF);
}
}
void delay(float time)
{
while(time--)
{
}
}
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
while (1)
{
}
}
#endif
Untuk file headernya
/*
* See pinout.txt in the root directory of this project for the
* LCD pinout.
*/
#ifndef __CHARLCD_H__
#define __CHARLCD_H__
// Device Defines (set these for your device!)
#define Num_Lines 4
#define Num_Characters 20 // Per line
#define Set_RS GPIO_SetBits(GPIOD,GPIO_Pin_7)
#define Clr_RS GPIO_ResetBits(GPIOD,GPIO_Pin_7)
#define Set_RW GPIO_SetBits(GPIOD,GPIO_Pin_8)
#define Clr_RW GPIO_ResetBits(GPIOD,GPIO_Pin_8)
#define Set_En GPIO_SetBits(GPIOD,GPIO_Pin_9)
#define Clr_En GPIO_ResetBits(GPIOD,GPIO_Pin_9)
// May use pwm and a transistor on the 5V rail in the final version
#define Backlight_On GPIO_SetBits(GPIOD,GPIO_Pin_10)
#define Backlight_Off GPIO_ResetBits(GPIOD,GPIO_Pin_10)
extern u8 CharLCD_line,CharLCD_column;
typedef struct {
u8 number;
u8 line[8];
} CustomCharacter;
void CharLCD_Config(void);
void CharLCD_Init(void);
void CharLCD_WriteLineWrap(const char* string);
void CharLCD_WriteLineNoWrap(const char* string);
void CharLCD_WriteString(const char* line);
void CharLCD_SendCustom(CustomCharacter *character);
void CharLCD_WriteCustom(CustomCharacter *character);
void CharLCD_SetCursor(u8 line,u8 column);
void CharLCD_Clear(void);
void CharLCD_Delay(int Count);
void CharLCD_Test(void);
void CharLCD_WriteData(u8 data);
void CharLCD_Backlight(u8 status);
void CharLCD_IncrementCursorVariables(void);
#endif // endif for __CHARLCD_H__
Untuk file C nya
/*
*
* charlcd.c
*
* Interfaces an stm32f4 series microcontroller with an HD44780 LCD.
*
* Should be simple enough to adapt this to your needs, may need some changes
* to the .h file as well.
*
* Copyright 2013 Tom McLeod, please see the LICENSE file in the projects root
* directory for more info.
*
*/
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "charlcd.h"
u8 CharLCD_line = 1;
u8 CharLCD_column = 1;
// Configures the gpio pins and clocks on the microcontroller
void CharLCD_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// Open the clocks we want
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE,ENABLE);
// Configure the LCD pins for push-pull output
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_Init(GPIOE,&GPIO_InitStructure);
// Control pins
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
GPIO_Init(GPIOD,&GPIO_InitStructure);
}
// Initializes the LCD itself
void CharLCD_Init(void)
{
CharLCD_WriteData(0x00);
Set_RS;
Set_RW;
Set_En;
CharLCD_Delay(0xFFFF);
Clr_RS;
Clr_RW;
Clr_En;
// 8-bit, 2-line (4-line displays use 2-lines with more characters per line)
if(Num_Lines > 1)
{
CharLCD_WriteData(0x38);
}else if(Num_Lines == 1)
{
CharLCD_WriteData(0x30);
}
// Turn display on, with cursor on and blinking
CharLCD_WriteData(0x0F);
// increment left, no screen shift
CharLCD_WriteData(0x06);
CharLCD_Delay(0xFF);
CharLCD_Clear();
}
/*
* Takes a string and will print it to the LCD, if the string would
* go over the total number of characters in a line this function will
* wrap it around to the NEXT line (note that normally it will skip
* a line due to the layout of the DDRAM in relation to the lines on
* the LCD. Particularly useful for 2-4 line LCD's
*/
void CharLCD_WriteLineWrap(const char* string)
{
char line[(Num_Characters + 1)];
u8 i,j,k,l;
k = 0;
l = 0;
for(j = CharLCD_line;j <= Num_Lines;j++){
for(i = CharLCD_column;i <= Num_Characters;i++){
line[l] = string[k];
if(line[l] == '\0') {
CharLCD_WriteString(line);
return;
}
k++;
l++;
}
line[l] = '\0';
CharLCD_WriteString(line);
CharLCD_SetCursor(j+1,1);
l = 0;
}
}
/*
* This will take an input string and send as much of it to the LCD
* as is required to fill up the rest of the current line, it will not
* extend to the next line, just truncate as soon as it hits the end of
* the current.
*/
void CharLCD_WriteLineNoWrap(const char* string)
{
char line[(Num_Characters + 1)];
u8 i,j;
j = 0;
for(i = CharLCD_column;i <= Num_Characters;i++){
line[j] = string[j];
j++;
}
line[j] = '\0';
CharLCD_WriteString(line);
}
/*
* This function will just take a string and print it directly,
* it does not take into account the lines or number of characters
* in each line in any way. If your string input is too long it will
* wrap in an odd way(or not at all) on most if not all LCD's.
* Consider using the helper functions above for most/all string writing,
* that's what they're there for.
*/
void CharLCD_WriteString(const char* line)
{
int i;
Set_RS;
for(i = 0;i < 80;i++){
if(line[i] == '\0' || !line[i]){
return;
}else {
CharLCD_WriteData((int)line[i]);
}
}
Clr_RS;
}
/*
* First have to send the custom character's data to the CGRAM.
* There are 8 addresses provided for use with custom characters,
* though they can be written and rewritten at any time.
*/
void CharLCD_SendCustom(CustomCharacter *character)
{
if(character->number <= 7){
Clr_RS;
Clr_RW;
u8 templine = CharLCD_line;
u8 tempcolumn = CharLCD_column;
CharLCD_WriteData(0x40 | (character->number));
Set_RS;
u8 i;
for(i = 0;i < 8;i++){
CharLCD_WriteData(character->line[i]);
}
Clr_RS;
CharLCD_SetCursor(templine,tempcolumn);
} // else: learn more about the LCD you're using :)
}
/*
* Writes a custom character to the screen
*/
void CharLCD_WriteCustom(CustomCharacter *character)
{
Clr_RW;
Set_RS;
CharLCD_WriteData(character->number);
Clr_RS;
}
void CharLCD_SetCursor(u8 line,u8 column)
{
Clr_RS;
Clr_RW;
u8 position;
switch(line) {
case 1:
position = column - 0x01;
break;
case 2:
position = column + 0x3F;
break;
case 3:
position = column + 0x13;
break;
case 4:
position = column + 0x53;
break;
default:
break;
}
CharLCD_WriteData(position | 0x80);
CharLCD_line = line;
CharLCD_column = column;
}
void CharLCD_Clear(void)
{
Clr_RS;
Clr_RW;
CharLCD_WriteData(0x01);
CharLCD_line = 1;
CharLCD_column = 1;
CharLCD_Delay(0xFFF);
}
void CharLCD_Delay(int Count)
{
while(Count--)
{
}
}
void CharLCD_Test(void)
{
int i;
Set_RS;
for(i = 33;i < 33+(Num_Characters*Num_Lines);i++){
CharLCD_WriteData(i);
}
}
/*
* Host write timing diagram:
* ------\ /-----------------\ /------
* RS (low if X writing register, X high if not)
* ______/ \_________________/ \______
*
* ------\ /-------
* R/W \ /
* \________________/
*
* /-------\ /-------
* E / 175ns \ /
* ______/ \______/
*
* /-------\
* DB0-DB7 / \
* ____________/ \__________
*
*/
void CharLCD_WriteData(u8 data)
{
GPIOE->ODR=((GPIOE->ODR & 0xF00F) | (data << 4));
Set_En;
CharLCD_Delay(0xFF);
Clr_En;
CharLCD_Delay(0xFF);
GPIOE->ODR=((GPIOE->ODR & 0xF00F));
CharLCD_IncrementCursorVariables();
}
void CharLCD_Backlight(u8 status)
{
if(status)
{
Backlight_On;
}else
{
Backlight_Off;
}
}
void CharLCD_IncrementCursorVariables(void)
{
if((CharLCD_column + 1) <= Num_Characters) {
CharLCD_column++;
}else if((CharLCD_line + 1) <= Num_Lines) {
CharLCD_line++;
CharLCD_column = 1;
}else {
CharLCD_line = 1;
CharLCD_column = 1;
}
}
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