[HELP] XIN GIÚP CÁCH HIỂN THỊ TEXT LCD16x2

[nam_pro_9x]

Em giúp đứa bạn về cách hiển thị lcd16x2.với ATmega 32, Em sử dụng WINAVR. nhưng Em vẫn chưa hiểu rõ về cách lập trình lcd này và cách sử dụng WINAVR. Và đây là đoạn CODE.ai biết thì xin giúp em với ạ!


#include <util/delay.h>
#define sbi(sfr,bit) sfr|=_BV(bit)
#define cbi(sfr,bit) sfr&=~(_BV(bit))
#define EN 2
#define RW 1
#define RS 0
#define CTRL PORTB
#define DDR_CTRL DDRB
#define DATA_O PORTB
#define DATA_I PINB
#define DDR_DATA DDRB
/*
#define LCD8BIT
#define DATA_O PORTD
#define DATA_I PIND
#define DDR_DATA DDRD
*/
char Read2Nib(){
char HNib, LNib;
DATA_O |=0xF0;
sbi(CTRL,EN); //enable
DDR_DATA &=0x0F; //set 4 bits cao cua PORT DATA lam input
HNib=DATA_I & 0xF0;
cbi(CTRL,EN); //disable

sbi(CTRL,EN); //enable
LNib = DATA_I & 0xF0;
cbi(CTRL,EN); //disable
LNib>>=4;
return (HNib|LNib);
}
void Write2Nib(uint8_t chr){
uint8_t HNib, LNib, temp_data;
temp_data=DATA_O & 0x0F; //doc 4 bit thap cua DATA_O de mask,
HNib=chr & 0xF0;
LNib=(chr<<4) & 0xF0;

DATA_O =(HNib |temp_data);
sbi(CTRL,EN); //enable
cbi(CTRL,EN); //disable

DATA_O =(LNib|temp_data);
sbi(CTRL,EN); //enable
cbi(CTRL,EN); //disable
}

void wait_LCD(){
#ifdef LCD8BIT
while(1){
cbi(CTRL,EN); //xóa EN
cbi(CTRL,RS); //đây là Instruction
sbi(CTRL,RW); //chiều từ LCD ra ngoài

DDR_DATA=0xFF; //hướng data out
DATA_O=0xFF; // gởi lệnh đọc BF
sbi(CTRL,EN); //enable

DDR_DATA=0x00; // Đổi hướng data in
if(bit_is_clear(DATA_I,7)) break;
}
cbi(CTRL,EN); //disable for next step
cbi(CTRL,RW); //ready for next step
DDR_DATA=0xFF; //Ready to Out
#else
char temp_val;
while(1){
cbi(CTRL,RS); //RS=0, the following data is COMMAND
sbi(CTRL,RW); //LCD -> AVR
temp_val=Read2Nib();
if (bit_is_clear(temp_val,7)) break;
}
cbi(CTRL, RW); //ready for next step
DDR_DATA=0xFF;//Ready to Out
#endif
//_delay_ms(1);
}
void init_LCD(){
DDR_CTRL=0xFF;
DDR_DATA=0xFF;
//Function set------------------------------------------------------------------------------
cbi(CTRL,RS); // the following data is COMMAND
cbi(CTRL, RW); // AVR->LCD
cbi(CTRL, EN);
#ifdef LCD8BIT
Write8Bit(0x38);
wait_LCD();
#else
sbi(CTRL,EN); //enable
sbi(DATA_O, 5);
cbi(CTRL,EN); //disable
wait_LCD();
Write2Nib(0x28);//4 bit mode, 2 line, 5x8 font
wait_LCD();
#endif
//Display control-------------------------------------------------------------------------
cbi(CTRL,RS); // the following data is COMMAND
#ifdef LCD8BIT
Write8Bit(0x0E);
wait_LCD();
#else
Write2Nib(0x0E);
wait_LCD();
#endif
//Entry mode set------------------------------------------------------------------------
cbi(CTRL,RS); // the following data is COMMAND
#ifdef LCD8BIT
Write8Bit(0x06);
wait_LCD();
#else
Write2Nib(0x06);
wait_LCD();
#endif
}
void home_LCD(){
cbi(CTRL,RS); // the following data is COMMAND
#ifdef LCD8BIT
Write8Bit(0x02);
wait_LCD();
#else
Write2Nib(0x02);
wait_LCD();
#endif
}
void move_LCD(uint8_t y,uint8_t x){
uint8_t Ad;
Ad=64*(y-1)+(x-1)+0x80; // tính mã lệnh
cbi(CTRL,RS); // the following data is COMMAND
#ifdef LCD8BIT
Write8Bit(Ad);
wait_LCD();
#else
Write2Nib(Ad);
wait_LCD();
#endif
}
void clr_LCD(){ //xóa toàn bộ LCD
cbi(CTRL,RS); //RS=0 mean the following data is COMMAND (not normal DATA)
#ifdef LCD8BIT
Write8Bit(0x01);
wait_LCD();
#else
Write2Nib(0x01);
wait_LCD();
#endif
}
void putChar_LCD(uint8_t chr){ //hiển thị 1 ký tự chr lên LCD
sbi(CTRL,RS); //this is a normal DATA
#ifdef LCD8BIT
Write8Bit(chr);
wait_LCD();
#else
Write2Nib(chr);
wait_LCD();
#endif
}
void print_LCD(char* str, unsigned char len){ //Hiển thị 1 chuỗi ký tự
unsigned char i;
for (i=0; i<len; i++)
if(str[i] > 0) putChar_LCD(str[i]);
else putChar_LCD(' ');
}
}