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

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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++);

}


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