All connections are done on port D.
This is my program code.
I am using stm32f407vg disc board.
/*
* lcd_programming.c
*
* Created on: 20-Aug-2020
* Author: SOBHIT PANDA
*/
#include "stm32f407xx.h"
#include "stm32f407xx_gpio_driver.h"
void LCD4bits_Cmd(unsigned char command);
void LCD4bits_Data(unsigned char data);
void delayUs(uint8_t n);
void delayMs(uint8_t n);
void LCD4Bits_Init (void);
void LCD_Line1 (unsigned char position);
void LCD_Line2 (unsigned char position);
void LCD_Nibble (unsigned char j);
void LCD_Clear (void);
#define disp_clear 0x01
#define disp_control 0x0C
#define func_set 0x28
int main()
{
LCD4Bits_Init();
LCD_Line1(0);
LCD4bits_Data("MICROCONTROLLER");
LCD_Line2(0);
LCD4bits_Data("KING");
while(1);
}
void LCD4Bits_Init (void)
{
GPIO_PeriClockControl(GPIOD,ENABLE);
GPIO_Handle_t LCD[8];
for (uint8_t i = 0 ; i < 8 ; i++)
{
LCD[i].pGPIOx = GPIOD ;
LCD[i].GPIO_PinConfig.GPIO_PinNumber = i;
LCD[i].GPIO_PinConfig.GPIO_PinMode = GPIO_MODE_OUT ;
LCD[i].GPIO_PinConfig.GPIO_PinSpeed = GPIO_SPEED_LOW ;
LCD[i].GPIO_PinConfig.GPIO_PinOPType = GPIO_OP_TYPE_PP ;
LCD[i].GPIO_PinConfig.GPIO_PinPuPdControl = GPIO_NO_PUPD ;
GPIO_Init(&LCD[i]);
}
GPIO_Handle_t RS = LCD[0];
GPIO_Handle_t EN = LCD[1];
GPIO_WriteToOutputPin(RS.pGPIOx , RS.GPIO_PinConfig.GPIO_PinNumber , DISABLE);
GPIO_WriteToOutputPin(EN.pGPIOx , EN.GPIO_PinConfig.GPIO_PinNumber , DISABLE);
delayMs(250);
LCD_Nibble(func_set);
delayMs(1);
LCD4bits_Cmd(func_set);
delayMs(1);
LCD4bits_Cmd(func_set);
delayMs(1);
LCD4bits_Cmd(func_set);
LCD4bits_Cmd(disp_control);
LCD_Clear();
}
void LCD_Nibble (unsigned char j) // 4 bit mode function for lcd
{
GPIO_WriteToOutputPort(GPIOD, 0xF0 | j);
GPIO_WriteToOutputPin(GPIOD , 1 , ENABLE);
delayUs(50);
GPIO_WriteToOutputPin(GPIOD , 1 , DISABLE);
}
void LCD4bits_Cmd(unsigned char command)
{
uint8_t temp;
GPIO_WriteToOutputPin(GPIOD , 0 , DISABLE);
temp=command;
LCD_Nibble (temp);
temp = temp<<4 ;
LCD_Nibble (temp);
}
void LCD4bits_Data(unsigned char data)
{
uint8_t temp;
GPIO_WriteToOutputPin(GPIOD , 0 , ENABLE);
temp=data;
LCD_Nibble (temp);
temp=temp<<4;
LCD_Nibble (temp);
}
void LCD_Line1 (unsigned char position) //lcd line 1 position function
{ LCD4bits_Cmd(0x80 + position); }
void LCD_Line2 (unsigned char position) //lcd line 2 position function
{ LCD4bits_Cmd(0xC0 + position); }
void LCD_Clear (void)
{
LCD4bits_Cmd(disp_clear);
delayMs(50);
}
void delayUs(uint8_t n)
{
for (int i = 0; i<n ; i++)
{
for (int j = 0; j<3 ; j++)
{
;
}
}
}
void delayMs(uint8_t n)
{
for (int i = 0; i<n ; i++)
{
for (int j = 0; j<3180 ; j++)
{
;
}
}
}
