Esp8266 interfacing with Atmega 8/16

[rohini]

I am not getting OK response when I am sending "ATrn" command to ESP8266. I am working on 9600bps and my module(esp) is also working on 9600bps, I checked it through Hyper terminal and it works fine.

 

 

 

 

//************************************************************

//Project: ESP-8266 with Atmega8(16Mhz)

//Author: Bivashkumar singh

//Module description: 4-bit Lcd 

//************************************************************

 

 

#include <stdio.h>

#include <avr/io.h>

#include <util/delay.h>

#include <stdlib.h>

#include "lcd.h"

unsigned char recive[50] = {0};

 

#define LCD_DPRT PORTC

#define LCD_DDDR DDRC

#define LCD_DPIN PINC

#define LCD_CPRT PORTB

#define LCD_CDDR DDRB

#define LCD_CPIN PINB

#define LCD_RS 0

#define LCD_RW 1

#define LCD_EN 2

 

int i=0;

void lcdcommand(unsigned char cmnd)

{

unsigned char chr = cmnd;

chr = (cmnd>>4); 

        LCD_DPRT = chr;

        LCD_CPRT &= ~(1<<LCD_RS);

        LCD_CPRT &= ~(1<<LCD_RW);

        LCD_CPRT |= (1<<LCD_EN);

        _delay_ms(1000);

        LCD_CPRT &= ~(1<<LCD_EN);

        for(i=0;i<=2;i++)

        _delay_ms(500);

        LCD_DPRT = (cmnd & 0x0f);

        LCD_CPRT |= (1<<LCD_EN);

        _delay_ms(1000);

        LCD_CPRT &= ~(1<<LCD_EN);

        for(i=0;i<;i++)

        _delay_ms(500);

 

}

 

 

 

 

void lcd_init()

{

        LCD_DDDR = 0XFF;

        LCD_CDDR = 0XFF;

        LCD_CPRT &=~(1<<LCD_EN);

for(i=0;i<=1;i++) 

        _delay_ms(1000); 

        lcdcommand(0x33);

_delay_ms(1000);

lcdcommand(0x32);

_delay_ms(1000);

lcdcommand(0x28);

_delay_ms(1000);

        lcdcommand(0x0e);

_delay_ms(1000);

        lcdcommand(0x01);

        for(i=0;i<=1;i++)

        _delay_ms(1000);

        lcdcommand(0x06);

}

 

 

void lcddata(unsigned char data)

{

       unsigned char chr = data;

        chr = (data>>4); 

        LCD_DPRT = chr;

        LCD_CPRT |= (1<<LCD_RS);

        LCD_CPRT &= ~(1<<LCD_RW);

        LCD_CPRT |= (1<<LCD_EN);

        _delay_ms(100);

        LCD_CPRT &= ~(1<<LCD_EN);

LCD_DPRT = (data & 0X0F);

LCD_CPRT |= (1<<LCD_EN);

        _delay_ms(500);

LCD_CPRT &= ~(1<<LCD_EN);

        for(i=0;i<=4;i++)

        _delay_ms(500);

}

 

 

void lcd_gotoxy(unsigned char x,unsigned char y)

{

        unsigned char firstchar[]={0x80,0xc0,0x94,0xd4};

        lcdcommand(firstchar[y-1]+x-1);

        _delay_us(500);

}

 

void lcd_print(char *ch)

{

        unsigned char i = 0;

        while(ch !=0)

        {

        lcddata(ch);

        i++;

        }

}

 

 

int lcd(unsigned char *recive)

{

        lcd_init();

        lcd_gotoxy(1,1);

// while(recive)

        lcd_print(recive);

        while(1);

return 0;

}

 

 

 

 

//****************************************ESP-8266***************************

//***************************************************************************

unsigned char recive[10] = {0};

//____________________________UART INIT______________________________________

//___________________________________________________________________________

void usart_init(void)

{

        UCSRB = (1<<TXEN) | (1<<RXEN);

        UCSRC = (1<<UCSZ1) | (1<<UCSZ0) | (1<<URSEL);

        UBRRL = 103; //baud rate 9600 (atmega8 16MHz)

}

 

 

//____________________________UART SEND_______________________________________

//____________________________________________________________________________

void usart_send(char *ch)

{

char i=0;

while(ch != 0) 

{

        while(!(UCSRA & (1<<UDRE)));

        UDR = ch;

i++;

}

}

 

 

//_____________________________UART RECIVE_____________________________________

//_____________________________________________________________________________

void usart_recive()

{

while(UDR)

{

while(!(UCSRA &(1<<RXC)));

recive[i++] = UDR;

}

}

 

 

 

//

---

main

---

//

---

int main(void)

{

int i=0;

cahr ch[50] = "ATrn"

 

    usart_init();

    usart_send(ch);

usart_send("rn");

_delay_ms(500);

for(i=0;i<=20;i++)

recive=usart_recive();

 

lcd(recive);

 

 

return 0;

}

 

//################################### END ###########################################

//###################################################################################

[Hari Prasaath K]

Check with below link to have look on more details about ESP interfacing

electronicwings.com/avr-atmega/atmega16-interface-with-esp8266-module

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