#include "MM32F103.h"
#include<stdio.h>
#include "sys.h"
#include "delay.h"
#include "uart.h"
/* LCD Commands */
#define LCD_DD_RAM_PTR 0x80 // Address Display Data RAM pointer
#define LCD_CG_RAM_PTR 0x40 // Address Character Generator RAM pointer
#define LCD_CLEAR_DISPLAY 0x01 // Clear entire display and set Display Data Address to 0
#define LCD_RETRN_HOME 0x02 // sets DDRAM address 0 and returns display from being shifted to original position.
#define LCD_DISP_INIT 0x28 // function set is 4 bit data length and 2 lines
#define LCD_INC_MODE 0x06 // Entry mode is display Data RAM pointer incremented after write
#define LCD_DISP_OFF 0x08 // Sets entire display off, cursor off
#define LCD_CURSOR_ON 0x04 // turn on cursor
#define LCD_CURSOR_OFF 0x00 // turn off cursor
#define LCD_CUR_MOV_LEFT 0x10 // Cursor move and shift to left
#define LCD_CUR_MOV_RIGHT 0x14 // Cursor move and shift to right
#define LCD_BUSY 0x80 // LCD is busy
#define LCD_CURSOR_BLINKING 0x0D //LCD cursor blinking
#define LCD_DISP_ON 0x0E //lcd cursor ON
/*************************LCD Control pins***********************************************/
#define Lcd_En_High() GPIO_SetBits(GPIOB, GPIO_Pin_15)
#define Lcd_En_Low() GPIO_ResetBits(GPIOB, GPIO_Pin_15)
#define Lcd_Rs_High() GPIO_SetBits(GPIOB, GPIO_Pin_14)
#define Lcd_Rs_Low() GPIO_ResetBits(GPIOB, GPIO_Pin_14)
/************************** LCD Data pins *************************************************/
#define Lcd_D7_High() GPIO_SetBits(GPIOB, GPIO_Pin_5)
#define Lcd_D7_Low() GPIO_ResetBits(GPIOB, GPIO_Pin_5)
#define Lcd_D6_High() GPIO_SetBits(GPIOB, GPIO_Pin_4)
#define Lcd_D6_Low() GPIO_ResetBits(GPIOB, GPIO_Pin_4)
#define Lcd_D5_High() GPIO_SetBits(GPIOB, GPIO_Pin_11)
#define Lcd_D5_Low() GPIO_ResetBits(GPIOB, GPIO_Pin_11)
#define Lcd_D4_High() GPIO_SetBits(GPIOB, GPIO_Pin_10)
#define Lcd_D4_Low() GPIO_ResetBits(GPIOB, GPIO_Pin_10)
/****************************************************************************************/
void Delay_stm(u32);
void LCD_Control_Write(unsigned char cmd);
void GPIO_Configuration_LCD(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_4 | GPIO_Pin_11 | GPIO_Pin_10| GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void Lcd_Delay(u32 nCount)
{
for(; nCount != 0; nCount--);
}
void LCD_initialization(void)
{
/* Set 4-bits interface */
printf("\r\n LCD init done");
LCD_Control_Write(0x33);
Delay_stm(1);
LCD_Control_Write(0x32);
Delay_stm(1);
LCD_Control_Write(LCD_DISP_INIT);
Delay_stm(1);
LCD_Control_Write(LCD_CLEAR_DISPLAY);
Delay_stm(1);
LCD_Control_Write(LCD_INC_MODE);
Delay_stm(1);
LCD_Control_Write(LCD_DISP_ON);
Delay_stm(1);
LCD_Control_Write(LCD_CURSOR_BLINKING);
Delay_stm(1);
LCD_Control_Write(LCD_CUR_MOV_RIGHT);
Delay_stm(1);
LCD_Control_Write(LCD_RETRN_HOME);
Delay_stm(1);
}
void LCD_Clear(void)
{
printf("\r\n LCD clr fun");
LCD_Control_Write(LCD_CLEAR_DISPLAY);
Delay_stm(5);
}
void LCD_Control_Write(unsigned char cmd)
{
unsigned char temp;
temp = cmd;
temp = temp & 0xf0;
if (temp & 0x80)
Lcd_D7_High();
else
Lcd_D7_Low();
temp = temp << 1;
if (temp & 0x80)
Lcd_D6_High();
else
Lcd_D6_Low();
temp = temp << 1;
if (temp & 0x80)
Lcd_D5_High();
else
Lcd_D5_Low();
temp = temp << 1;
if (temp & 0x80)
Lcd_D4_High();
else
Lcd_D4_Low();
temp = temp << 1;
Lcd_Rs_Low();
Lcd_En_High();
delay_ms(1);
Lcd_En_Low();
Delay_stm(200);
cmd = cmd << 4;
cmd = cmd & 0xF0;
if (cmd & 0x80)
Lcd_D7_High();
else
Lcd_D7_Low();
cmd = cmd << 1;
if (cmd & 0x80)
Lcd_D6_High();
else
Lcd_D6_Low();
cmd = cmd << 1;
if (cmd & 0x80)
Lcd_D5_High();
else
Lcd_D5_Low();
cmd = cmd << 1;
if (cmd & 0x80)
Lcd_D4_High();
else
Lcd_D4_Low();
cmd = cmd << 1;
Lcd_Rs_Low();
Lcd_En_High();
delay_ms(1);
Lcd_En_Low();
//Delay_stm(1);
}
void LCD_Data_Write(unsigned char data)
{
unsigned char temp;
printf("\r\n IN LCD data write fun");
temp = data;
temp = temp & 0xf0;
//printf("hai_in _write");
if (temp & 0x80)
Lcd_D7_High();
else
Lcd_D7_Low();
temp = temp << 1;
if (temp & 0x80)
Lcd_D6_High();
else
Lcd_D6_Low();
temp = temp << 1;
if (temp & 0x80)
Lcd_D5_High();
else
Lcd_D5_Low();
temp = temp << 1;
if (temp & 0x80)
Lcd_D4_High();
else
Lcd_D4_Low();
temp = temp << 1;
Lcd_Rs_High();
Lcd_En_High();
delay_ms(1);
Lcd_En_Low();
Lcd_Delay(2000);
data = data << 4;
data = data & 0xF0;
if (data & 0x80)
Lcd_D7_High();
else
Lcd_D7_Low();
data = data << 1;
if (data & 0x80)
Lcd_D6_High();
else
Lcd_D6_Low();
data = data << 1;
if (data & 0x80)
Lcd_D5_High();
else
Lcd_D5_Low();
data = data << 1;
if (data & 0x80)
Lcd_D4_High();
else
Lcd_D4_Low();
data = data << 1;
Lcd_Rs_High();
Lcd_En_High();
delay_ms(1);
Lcd_En_Low();
}
void RowDisplay(const char *Ptr,char line1)
{
int i = 0;
printf("\r\n IN Row display fun");
if(line1==1)LCD_Control_Write(0x80); //Address of first line first digit
if(line1==2)LCD_Control_Write(0xC0); //Address of secondline first digit
Lcd_Delay(50000);
for(i=0;i<16;i++) //for 16x2 lcd
{
LCD_Data_Write(Ptr[i]);
Lcd_Delay(2000);
}
}
void Delay_stm(u32 num)
{
delay_ms(num);
}
int main(void)
{
GPIO_Configuration_LCD();
uart_initwBaudRate(115200);
delay_init();
LCD_initialization();
LCD_Clear();
RowDisplay("M",1);
delay_ms(20);
RowDisplay("raju",2);
delay_ms(20);
while(1)
{
LCD_Clear();
delay_ms(1000);
RowDisplay("HELLO WORLD",2);
delay_ms(1000);
}
}
