Interfacing ESP8266 with an ATmega16/32

[Pranav Sewpersad]

Hello guys 

I am in desperate need of help with interfacing the esp8266 with an avr microcontroller. I have learnt how to use the esp8266 with a terminal software via a usb to serial module where i can set it up as a sever, connect devices to the module and communicate using the AT commands. I also setup the microcontroller to communicate via usart (with the specs needed to communicate with the wifi ,module) and was tested using hyperteminal. When I am sending the AT commands as strings to the module from the microcontroller nothing is happening(the module should send back "OK" or ERROR. How do I go about sending the AT commands to the wifi module from the micro? I have uploaded the code i am testing with below

 

 

 

/*

 * Uart9600TxRx.c

 *

 * Created: 4/20/2016 1:09:32 AM

 *  Author: Pranav

 */ 

 

 

//Uart working for bytes at baud of 9600 Tx and Rx

 

#include <avr/io.h>

#include <avr/interrupt.h>

#include <util/delay.h>

#include <string.h>

#ifndef F_CPU

#define F_CPU 16000000

#endif

volatile char rec;

 

void usart_msg(char *c)

{

while (*c != 0)                     //— Check for null

UartTx(*c++);                 //— Increment the pointer

}

void Usart_Init(){

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

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

UBRRL = 103 ;

UBRRH=0;

UCSRB |= (1 << RXCIE );

 

}

void UartTx(char send){

UDR=send;

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

}

int main(void)

{

Usart_Init();

DDRC=0XFF;

DDRB=0x00;

PORTB=0xFF;

sei();

char send;

//int x=0;

//SOME AT COMMANDS TO SETUP THE ESP8266 AS A SEVER

usart_msg("AT");

usart_msg("AT+CIPMUX=1");

usart_msg("AT+CIPSEVER=1,1003");

 

while(1)

{

 

 

}

}

ISR (USART_RXC_vect){

//char Rec;

//PORTC=0xFF;

_delay_ms(1000);

if(UDR=='O'){

PORTC=0xFF;

}

rec=UDR;

//UDR=rec;

//return(rec);

}

 

 

[Ashutosh Bhatt]

thr may be problem with baud rate. try to set exact baud rate between AVR uC and ESP8266

[Anonymous]

Hey, am sorry couldnt find the solution to it. But i need a little help. I am actually working on a project which includes use of esp8266. i am confused abt how i start.. please guide me if possible. Like how to interface esp8266 with microcontroller (i am using atmega328p). Wanna know the concepts and the other hardware if required. like do i need to even program esp along with atmega? 

[Ashutosh Bhatt]

first connect ESP8266 with PC / laptop through serial to USB converter and test it with AT commands through PC

[bivash]

I am also gatting same problem and already I checked with pc, Its worki

[Ashutosh Bhatt]

even I am having problem with ESP8266. it does not respond to direct AT commands given through PC

[Author]

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