Tutorial Microcontroller MCS-51 ATMEL ISP
 

 

Super MCS51 Trainer

Standart MCS51 Trainer

Standart AVR Trainer

Programmer USBASP

Standart ARM Trainer

  4. Experiment LCD Character 2x16

In this experiment, we are going to DRIVE LCD Character that connected to PORT IO microcontroller STM32F407. In this experiment, LCD Character are connected to PORTD5, PORTD6, PORTD7, PORTD0, PORTD1, PORTD2, PORTD3. Coocox software are used to edit, to compile and to upload, in discovery board STM32F407. Dont forget to use 3.3V power suppply in schematic as shown in Fig 1. Standart library used in this experiment are CMIS library: STM32f4xx_gpio.h, STM32f4xx_rcc.h and external library: include HD44780.h, source HD44780.c.

Fig.1. LCD character and Discovery board trainer connection

Fig.2. LCD Character Interface

HD44780 Library

Features

4bit operation mode
Minimum GPIOs used (6)
Supports different LCD sizes
Supports up to 8 custom characters
Enable/disable cursor blinking
Show/hide cursor
Shift content in ram left/right
Connection pins to board are user selectable
Automatically jumps to new line when you reach max X on LCD
Strings with \n, \r or \n\r
With \n in string LCD jumps to lower line, but X position stays the same
With \r in string LCD jumps to the beginning of the line
With \n\r in string LCD jumps to the beginning of a new line

Library dependencies

CMSIS
STM32F4xx
STM32F4xx RCC
STM32F4xx GPIO

Fig.3. Add Files header HD44780.h and source file HD44780.c

 

Fig 4. CMIS Library for LCD Character


#include "stm32f4xx.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "HD44780.h"
#include "stdlib.h"
#include <stdio.h>
int main(void)
{
LCD_ConfigurePort(GPIOD,GPIO_Pin_7, GPIO_Pin_5, GPIO_Pin_6,0,0, 0, 0,GPIO_Pin0, GPIO_Pin_1, GPIO_Pin_2, GPIO_Pin_3);
// RS RW EN D4 D5 D6 D7
LCD_Initalize(BUS_WIDTH_4, DISPLAY_LINES_2, FONT_5x8);
//Put string to LCD
LCD_MoveToPosition(0x00);
LCD_Print("Percobaan LCD");
while (1)
{
}
}