16x02 LCD via I2C (PCF8574) using STM32F103C8Tx microcontroller.

-

By: Nachiketh V Boin 

STM32F103C8Tx <-> PCF8574 <-> LCD 16×2 Documentation

-GitHub link for code files: nachikethboin/16x02-LCD-via-I2C-PCF8574-using-STM32F103C8Tx-microcontroller. (github.com)

-Hardware Components and PC Requirements

>STM32F103C8Tx Board. Amazon Buy Link

> LCD 16X02 MODULE WITH SERIAL I2C INTERFACE MODULE.  Amazon Buy Link

>PC with STM32CubeIde (CubeIDE Link) , Bread Board and connectors.

-Pinout and Configuration > A_>Z



·        RCC > Mode

> High Speed Clock (HSE) > Crystal/Ceramic Resonator (clock from external crystal).

>Low Speed Clock (LSE) > Disable. 

·        SYS > Mode

> Debug > Serial Wire (select serial wire debug or else the ST link will not work after the first flash and to make it work again you have to erase it).

> Timebase Source > SysTick.

·        I2C1 > Mode

> I2C > I2C (Note: Pin PB6 > I2C SCL, Pin PB7 > I2C SDA)

-Clock Configuration


-i2c-lcd.h file

/** Put this in the Inc folder **/

#include "stm32f1xx_hal.h"

void lcd_init (void);   // initialize lcd

void lcd_send_cmd (char cmd);  // send command to the lcd

void lcd_send_data (char data);  // send data to the lcd

void lcd_send_string (char *str);  // send string to the lcd

void lcd_put_cur(int row, int col);  // put cursor at the entered position row (0 or 1), col (0-15);

void lcd_clear (void);

 

-i2c-lcd.c file

 

/** Put this in the src folder **/

#include "i2c-lcd.h"

extern I2C_HandleTypeDef hi2c1;  // change your handler here accordingly

#define SLAVE_ADDRESS_LCD 0x4E // change this according to ur setup

void lcd_send_cmd (char cmd)

{

  char data_u, data_l;

      uint8_t data_t[4];

      data_u = (cmd&0xf0);

      data_l = ((cmd<<4)&0xf0);

      data_t[0] = data_u|0x0C;  //en=1, rs=0

      data_t[1] = data_u|0x08;  //en=0, rs=0

      data_t[2] = data_l|0x0C;  //en=1, rs=0

      data_t[3] = data_l|0x08;  //en=0, rs=0

      HAL_I2C_Master_Transmit (&hi2c1, SLAVE_ADDRESS_LCD,(uint8_t *) data_t, 4, 100);

}

void lcd_send_data (char data)

{

      char data_u, data_l;

      uint8_t data_t[4];

      data_u = (data&0xf0);

      data_l = ((data<<4)&0xf0);

      data_t[0] = data_u|0x0D;  //en=1, rs=0

      data_t[1] = data_u|0x09;  //en=0, rs=0

      data_t[2] = data_l|0x0D;  //en=1, rs=0

      data_t[3] = data_l|0x09;  //en=0, rs=0

      HAL_I2C_Master_Transmit (&hi2c1, SLAVE_ADDRESS_LCD,(uint8_t *) data_t, 4, 100);

}

void lcd_clear (void)

{

      lcd_send_cmd (0x80);

      for (int i=0; i<70; i++)

      {

            lcd_send_data (' ');

      }

} 

void lcd_put_cur(int row, int col)

{

    switch (row)

    {

        case 0:

            col |= 0x80;

            break;

        case 1:

            col |= 0xC0;

            break;

    }

    lcd_send_cmd (col);

}

void lcd_init (void)

{

      // 4 bit initialization

      HAL_Delay(50);  // wait for >40ms

      lcd_send_cmd (0x30);

      HAL_Delay(5);  // wait for >4.1ms

      lcd_send_cmd (0x30);

      HAL_Delay(1);  // wait for >100us

      lcd_send_cmd (0x30);

      HAL_Delay(10);

      lcd_send_cmd (0x20);  // 4bit mode

      HAL_Delay(10);

  // display initialization

      lcd_send_cmd (0x28); // Function set --> DL=0 (4 bit mode), N = 1 (2 line display) F = 0 (5x8 characters)

      HAL_Delay(1);

      lcd_send_cmd (0x08); //Display on/off control --> D=0,C=0, B=0  ---> display off

      HAL_Delay(1);

      lcd_send_cmd (0x01);  // clear display

      HAL_Delay(1);

      HAL_Delay(1);

      lcd_send_cmd (0x06); //Entry mode set --> I/D = 1 (increment cursor) & S = 0 (no shift)

      HAL_Delay(1);

      lcd_send_cmd (0x0C); //Display on/off control --> D = 1, C and B = 0. (Cursor and blink, last two bits)

}

void lcd_send_string (char *str)

{

      while (*str) lcd_send_data (*str++);

}


thank you for reading my blog.




 

 

 

 

Comments

Post a Comment

Popular posts from this blog

Simple Production Line in Siemens Tecnomatix Plant Simulation

-
Image
Simple Production Line Project Files ( GitHub ) : nachikethboin/Simple-Production-Line-in-Tecnomatix-Plant-Simulation Building the Production Line Model Insert Essential Objects: Source: This object produces parts to feed into your production line. Find it in the toolbox, hover over it, drag it into the modeling frame, and click to place. Stations (Machines): Insert three station objects that represent machines or processing points. Select the station object in the toolbox, drag it into the frame, and place it. To quickly add multiple stations, press and hold the Ctrl key while clicking each placement location—this preserves your selection so you can add several instances in one go. Drain: Finally, add a drain object which removes parts from the system and collects production statistics. Connect Objects for Material Flow: Select the connector tool from the toolbox. Hold ...
Read more

SOC Estimation and modelling of Electric Vehicle EV in MATLAB

-
Image
By: Nachiketh.V. Boin  YouTube Video:  SOC Estimation of Electric Vehicle (EV) in Matlab-Simulink #Simulink_Student_Challenge_2022 - YouTube For Simulink Model File:    nachikethboin/SOC-Estimation-of-Electric-Vehicle-EV-in-MATLAB (github.com) Aim:  Modeling and Simulation of Electric Vehicle (EV) using Matlab Objectives:    1. To make a simple, low run-time model of an electric vehicle using individual component models.  2. To check performance parameters: Speed, SOC, current, etc. with various drive cycles.  3. To play with: motor power, vehicle body (rolling resistance, air drag, weight) inputs.  4. To know MATLAB models and their configurations to match with an actual vehicle. Software used:    MATLAB-SIMULINK   MATLAB Packages  Used:   Simscape package, also need the driveline package, the powertrain block set package and electrical package. All for Simscape.  Illustration of general EV Configu...
Read more