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lcd.c
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lcd.c
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#include <stdio.h>
#include <stdio.h>
#include <MKL25Z4.h>
#include <stdint.h>
#include <string.h>
#include "theLcd.h"
#define rs (0)
#define rw (1)
#define en (2)
#define MASK(X) (1UL<<X)
void delay_ms(uint16_t delay){
for(int i=0; i<delay*1000; i++){
__asm volatile("nop");
__asm volatile("nop");
}
}
void delay_us(uint16_t delay){
for(int i=0; i<delay; i++){
__asm volatile("nop");
__asm volatile("nop");
}
}
void makeRsLow(){ PTB->PDOR &= ~(1 << rs);}
void makeRsHigh(){PTB->PDOR |= (1 << rs);}
void makeRwLow(){PTB->PDOR &= ~(1 << rw);}
void makeRwHigh(){PTB->PDOR |= (1 << rw);}
void makeEnLow(){PTB-> PCOR = 1UL<<en;}
void clear(){
PTB -> PDOR &= ~(1 << rw);
PTB -> PDOR &= ~(1 << rs);
PTC -> PDOR &= ~(1 << 0);
PTC -> PDOR &= ~(1 << 1);
PTC -> PDOR &= ~(1 << 1);
PTC -> PDOR &= ~(1 << 3);
PTC -> PDOR &= ~(1 << 4);
PTC -> PDOR &= ~(1 << 5);
PTC -> PDOR &= ~(1 << 6);
PTC -> PDOR &= ~(1 << 7);
}
void toggleEnable(){
PTB-> PSOR = 1UL<<en;
delay_ms(1);
PTB-> PCOR = 1UL<<en;
delay_ms(1);
}
void LCD_command(uint8_t hexValue){
makeEnLow();
PTC-> PDOR = hexValue;
toggleEnable();
}
void setClock(int x){
SIM->SCGC5|= (1UL<<x); // using scgc5 clock
}
void setDataPins(){
SIM->SCGC5|= (1UL<< 11); // timing to port c
PORTC->PCR[0] &= ~0x700;
PORTC->PCR[0] |= (1UL<<8);
PTC->PDDR |= (1 << 0);
PORTC->PCR[1] &= ~0x700;
PORTC->PCR[1] |= (1UL<<8);
PTC->PDDR |= (1 << 1);
PORTC->PCR[2] &= ~0x700;
PORTC->PCR[2] |= (1UL<<8);
PTC->PDDR |= (1 << 2);
PORTC->PCR[3] &= ~0x700;
PORTC->PCR[3] |= (1UL<<8);
PTC->PDDR |= (1 << 3);
PORTC->PCR[4] &= ~0x700;
PORTC->PCR[4] |= (1UL<<8);
PTC->PDDR |= (1 << 4);
PORTC->PCR[5] &= ~0x700;
PORTC->PCR[5] |= (1UL<<8);
PTC->PDDR |= (1 << 5);
PORTC->PCR[6] &= ~0x700;
PORTC->PCR[6] |= (1UL<<8);
PTC->PDDR |= (1 << 6);
PORTC->PCR[7] &= ~0x700;
PORTC->PCR[7] |= (1UL<<8);
PTC->PDDR |= (1 << 7);
}
void setControlPins(){
SIM->SCGC5|= (1UL<< 10); // timing to port b
PORTB->PCR[rs] &= ~0x700;
PORTB->PCR[rs] |= (1UL<<8);
PTB->PDDR |= (1UL << rs);
PORTB->PCR[rw] &= ~0x700;
PORTB->PCR[rw] |= (1UL<<8);
PTB->PDDR |= (1UL << rw);
PORTB->PCR[en] &= ~0x700;
PORTB->PCR[en] |= (1UL<<8);
PTB->PDDR |= (1UL << en );
}
void LCD_init(){
// from the data sheet
clear();
delay_ms(30);
makeRsLow();
makeRwLow();
LCD_command(0x30);
delay_ms(10);
LCD_command(0x30);
delay_us(200);
LCD_command(0x30);
LCD_command(0x38); // change to 3C
// performOperation(0x08); //displayOff
// performOperation(0x01); //displayClear
// performOperation(0x0F); //LCD_DisplayOn
// LCD_command(0x06);
// delay_us(100);
LCD_command(0X08);
delay_us(100);
LCD_command(0X01);
delay_ms(10);
LCD_command(0X0F);
delay_us(100);
LCD_command(0X06);
delay_us(100);
}
void LCD_write_char(uint8_t letter){
PTB->PDOR |= (1 << rs);
PTB->PDOR &= ~(1 << rw);
LCD_command(letter);
}
void LCD_write_string(char letter){
PTB->PDOR |= (1 << rs);
PTB->PDOR &= ~(1 << rw);
LCD_command(letter);
}
void LCD_write_word(char word[])
{
PTB->PDOR |= (1 << rs);
makeRwLow(); PTB->PDOR &= ~(1 << rw);
for(int i=0; i<strlen(word); i++){
LCD_command(word[i]);
}
}