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Esp8266 WebServer using
STM32 HAL
I already covered How to manage multiple UARTs using ring buffer in STM32.
You must have a knowledge of that, if you want to understand this one. Better take
a look at that tutorial first.
Today, in this tutorial, we will use the ring buffer to manage a Esp8266 Webserver
using STM32 HAL library. Basically, we will blink a LED using WiFi, by creating a
webserver.
Below is the CubeMX setup. Two UARTs are being used. One is connected to the
ESP8266, and another is connected to the computer.
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esp8266 setup
Below is the connection between the ESP8266 and the STM32.
esp8266 connection
Some Insight into the CODE
Let’s see some of the functions, that we are going to use
ESP init
void ESP_Init (char *SSID, char *PASSWD)
{
char data[80];
Ringbuf_init();
Uart_sendstring("AT+RST\r\n", wifi_uart);
Uart_sendstring("RESETTING.", pc_uart);
for (int i=0; i<5; i++)
{
Uart_sendstring(".", pc_uart);
HAL_Delay(1000);
}
/********* AT **********/
Uart_sendstring("AT\r\n", wifi_uart);
while(!(Wait_for("AT\r\r\n\r\nOK\r\n", wifi_uart)));
Uart_sendstring("AT---->OK\n\n", pc_uart);
/********* AT+CWMODE=1 **********/
Uart_sendstring("AT+CWMODE=1\r\n", wifi_uart);
while (!(Wait_for("AT+CWMODE=1\r\r\n\r\nOK\r\n", wifi_uart)));
Uart sendstring("CW MODE---->1\n\n", pc uart);
ESP_Init (“SSID”, “PASSWD”) Initialises the ESP8266. Its parameter are the SSID
and PASSWD of the Access point that you want to connect to. This function sends
some AT commands in a sequence, and than waits for the expected response after
every command. These commands are given below
AT –> to check if the ESP is responding
AT+CWMODE=1 –> to set the ESP into the station mode
AT+CWJAP=”SSID”, “PASSWD” –> Join the access point with the SSID, and
PASSWD
AT+CIFSR –> Queries for the IP address of the ESP
AT+CIPMUX=1 –> Set the multiple connection as TRUE
AT+CIPSERVER=1,80 –> Starts a server at port 80
All the above information can be seen on the Serial console. Once the ESP gets the
IP address, it will also be printed on the console as shown below
esp8266 output
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Next, we will connect to this IP address, but make sure the device and the ESP
should be connected to the same network.
server start
void Server_Start (void)
{
char buftocopyinto[64] = {0};
char Link_ID;
while (!(Get_after("+IPD,", 1, &Link_ID, wifi_uart)));
Link_ID -= 48;
while (!(Copy_upto(" HTTP/1.1", buftocopyinto, wifi_uart)));
if (Look_for("/ledon", buftocopyinto) == 1)
{
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, 1);
Server_Handle("/ledon",Link_ID);
}
else if (Look_for("/ledoff", buftocopyinto) == 1)
{
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, 0);
Server_Handle("/ledoff",Link_ID);
}
else if (Look_for("/favicon.ico", buftocopyinto) == 1);
else
{
HAL GPIO WritePin(GPIOA, GPIO PIN 5, 0);
Server_Start() checks the incoming connection, and look for the request made by
the browser. If the request is about ledon, or ledoff, or the root. Once identified, it
will call the Server_Handle to handle that request
If the request is made for the root, or ledoff the following will be displayed on the
browser
esp8266 root
Note that the LED on board is OFF right now. There is a option displayed on the web
browser to turn this LED ON.
If we tap this ON button, a ledon request will be sent to the ESP, and the
Server_Start will call Server_Hnadle to handle this ledon request.
esp8266 ledon
Now the LED is ON, and there is a OFF button to turn it OFF.
The web page source code is divided into 3 categories
Initial part, where the basic stuff will load
Button and Status part, which will depend on what request is being
processed
Ending part, which will close the tags
Initial part
/**** Initial Part ****/
char *Basic_inclusion = "<!DOCTYPE html> <html>\n<head><meta name=\"viewpo
content=\"width=device-width, initial-scale=1.0, user-scalable=no\
<title>LED CONTROL</title>\n<style>html { font-family: Helvetica;
display: inline-block; margin: 0px auto; text-align: center;}\n\
body{margin-top: 50px;} h1 {color: #444444;margin: 50px auto 30px;
h3 {color: #444444;margin-bottom: 50px;}\n.button {display: block;
width: 80px;background-color: #1abc9c;border: none;color: white;\
padding: 13px 30px;text-decoration: none;font-size: 25px;\
margin: 0px auto 35px;cursor: pointer;border-radius: 4px;}\n\
.button-on {background-color: #1abc9c;}\n.button-on:active \
{background-color: #16a085;}\n.button-off {background-color: #3449
.button-off:active {background-color: #2c3e50;}\np {font-size: 14p
</style>\n</head>\n<body>\n<h1>ESP8266 LED CONTROL</h1>\n";
/**** Button and Status Part ****/
char *LED_ON = "<p>LED Status: ON</p><a class=\"button button-off\" href=\
char *LED_OFF = "<p>LED1 Status: OFF</p><a class=\"button button-on\" href
/**** Ending Part ****/
char *Terminate = "</body></html>";
To make this entire thing work, all you have to do is as shown below
main function
/* USER CODE BEGIN Includes */
#include "ESP8266_HAL.h"
int main(void)
{
.....
.....
.....
ESP_Init("S9","12345678");
while (1)
{
Server_Start();
}
}
In case you are using a microcontroller, which gave you error on Uart_isr
function. Errors like DR and SR are not present, replace the Uart_isr code with
the following file Uart_isr.c
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Result
esp8266 ledoff
esp8266 ledon
Check out the Video Below
ESP8266 WebServer using STM32 HAL|| LED Control || Ring …
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49 Comments. Leave
new
Ali Akbar
February 1, 2024 8:10 PM
Bro It was great experience , I have
accomplished this task, but now I
need 2 to 3 button for home
automation project, I have written
code for 2 button , but It wont work, I
think there is issue with the link ID ,
will you fig it out , I will share the
code to you.
Reply
Harsh
November 4, 2023 8:20 AM
Can we add multiple button to
control multiple leds in home
automation using stm32 and esp01
8266
Reply
Prashanth
November 1, 2023 7:09 PM
I am using Nucleo-f446re board, i
am using cube IDE, i have given
connection of PA9 to RX of esp-01
and PA10 to TX of esp-01 and 3.3v
to 3.3v and gnd to gnd.
My Code is stuck at
while (!IsDataAvailable(uart));
if (Uart_peek(uart) != string[so_far])
{
_rx_buffer1->tail = (unsigned int)
(_rx_buffer1->tail + 1) %
UART_BUFFER_SIZE ;
goto again_device;
Reply
Ilham
July 30, 2022 7:17 AM
How to configure that ESP12E to the
micro STM32? I just see RX wire to
TX(stm32) and TX wire to
RX(stm32). Where the usb cable
connect?. and in the tutorial that is
comunication micro to micro, Is the
ESP12E have a program or a
firmware before?
Reply
admin
July 30, 2022 10:22 AM
The tutorial is about ESP8266
module, not the micro.
If you are using micro, then
make sure it is running the AT
firmware (which works with AT
Commands). You need to flash
this firmware for your micro.
Reply
Everton Trento Junior
May 30, 2022 8:31 PM
How fixed the “Reseting…” issue in
STM32F103? i tried put GPIO0 and
GPIO1 in 3V3 and still no feedback,
just reseting….
Reply
Ian LY
June 19, 2022 8:41 PM
Faced and solved similar issue.
The ESP_Init() is waiting for
responses, which are different
based on AT firmware version.
Example :
During the “Resetting…..” issue
Device waiting response,
while(!
(Wait_for(“AT\r\r\n\r\nOK\r\n”,
wifi_uart)));
Fix with the correct response,
while(!(Wait_for(“OK”,
wifi_uart)));
Here is the list of AT responses
I got from Arduino Serial
Monitor:
*You might need to check
yours.
AT
OK
AT+CWMODE=1
OK
AT+CWJAP=”ssid”,”pass”
WIFI CONNECTED
WIFI GOT IP
OK
AT+CIFSR
+CIFSR:STAIP,”ip_address”
+CIFSR:STAMAC,”mac_number”
OK
AT+CIPMUX=1
OK
AT+CIPSERVER=1,80
OK
Reply
Jhon Wick
April 23, 2023 5:02 AM
did you get anything?
Reply
Jongwoon Choi
January 29, 2022 8:17 PM
Hello,
I have tried to read your ring_buffer
code,
It is not easy for me to see why you
used ‘rx_buffer1’ and ‘_rx_buffer1’.
Would you explain the role of
‘rx_buffer1’ and ‘_rx_buffer1’?
sincerely yours,
Reply
Jongwoon Choi
January 30, 2022 6:09 PM
Thanks for your ring_buffer
code.
I got it to use a pointer with a
structure on the ring_buffer
code.
It shows very well how to
access members of a structure
using pointers.
Thanks again.
Reply
Goto Simon
January 27, 2022 3:36 AM
Hi, Great tutorials, learning a lot,
many many thanks!
Using the ESP8266 with a Nucleo-
STM32F756ZG and i am making
progress. Currently, I am stuck at
ESP_Init. I am monitoring incoming
data to PC with Сutecom on Linux
and it seems, that for every
sendstring, only the first character is
transmitted. Because of this, I am
guessing, also the sendstring to the
ESP8266 is not correct. Any idea,
what could be the problem? Wrong
UART setup? Would be happy, if I
get some solution
Reply
Jongwoon Choi
January 22, 2022 5:53 PM
Hello,
I have tried to port this program to
stm32h7xx board, it was compiled
well without error.
But there was no response from the
board. And I have debugged it, it
was stopped at the end of
“Uart_write” function. I still did not
know why it was stopped.
Would you help me?
Reply
Jongwoon Choi
January 19, 2022 12:05 PM
Hello,
Thanks for the nice program to learn
the usage of ESP8266 with STM32.
I checked this program is worked
very well in normal conditions.
I have interesting to run all programs
on FreeRTOS.
So I am trying to run this program on
FreeRTOS.
To check the possibility of it, I had
tried two ways.
Just after FreeRTOS mode and
configuration setup, I run it.
There was no message from the
terminal.
And I moved two lines, as
void StartDefaultTask(void const *
argument)
{
/* USER CODE BEGIN 5 */
ESP_Init(“staronic!_2G_5F”,”p21362136*”);
/* Infinite loop */
for(;;)
{
Server_Start();
osDelay(1);
}
/* USER CODE END 5 */
}
It generated a fault error.
How can I run this program on
FreeRTOS?
Reply
Jongwoon Choi
January 19, 2022 12:20 PM
I solved this problem, just
extending the value of stack
size as 518.
It worked very well on
FreeRTOS.
Thanks for your nice blog to
make a connection between
STM32 with an internet.
Reply
Jongwoon Choi
January 13, 2022 2:31 PM
Hello,
I am trying to run this job on
stm32h743, but there is some
compile error.
It is because usage of low-level
interrupt call as
READ_REG(huart->Instance->SR)
or
READ_REG(huart->Instance->DR)
the compiler generates an error
because of usage of SR, DR.. et.al.
How can compile this program for
stm32h743?
Reply
admin
January 13, 2022 4:05 PM
did you read the highlighted (in
white colour) part above the
“result” heading ?
Reply
Jongwoon Choi
January 14, 2022 10:14 AM
Thanks for your quick and
accurate comment. I got a
solution with your
comment. It was a big
mistake to read your article
roughly.
Reply
Jongwoon Choi
January 21, 2022 11:27 AM
There was no compile
error, if I changed
“Uart_isr” with the
highlighted part above
the “result” heading.
But there was no
response from
ESP8266. I think that
another modification is
needed to work on
stm32h743.
Reply
Jongwoon Choi
January 21, 2022
11:28 AM
Please help me.
Yash1t
November 8, 2021 12:01 PM
Hello,
I am trying to get the ESP8266
module to work as a webserver with
STM32F407, with the mentioned
code changes (from the tutorial)
added.
The UART1 is connected to the
WIFI module as PA9 (TX1_STM) to
RX_ESP and PB7 (RX1_STM) to
TX_ESP.
The UART2 is connected as PA2
(TX2_STM) to RX_UART_MODULE
and PA3 (RX2_STM) to
TX_UART_MODULE, where
UART_MODULE is an external
UART converter connected to the
PC.
I am flashing the code, but all I see
on the PC terminal (BAUD rate and
everything is set properly) is
“RESETTING…..” and then it just
hangs with no further change in the
print.
Can you please help or suggest
what could be going wrong?
PS: I tried a similar implementation
with ARDUINO UNO and it worked
properly. The example from here.
PLEASE HELP!!!!
Reply
Nacef Khadraoui
August 12, 2021 5:26 PM
i can’t download the code
Reply
Karl Simmons
May 3, 2021 4:37 PM
Great tutorial!:)
Reply
HOSEIN
April 30, 2021 4:12 PM
hello I am not able to receive the ip
address
Reply
Lau Kian Siong
April 30, 2021 10:50 AM
i also not able to receive the ip
address hercules screen shows only
RESETTING……after that it stops
from working…..what should i do so
that i would be able to receive the ip
address and open web page please
help me.
Thanks in advance
Reply
Yash1t
November 8, 2021 12:09 PM
Hi Lau Kian Siong,
Did you manage to get it
working>??
Can you please let me know if
and how you got it working??
Reply
amir
April 26, 2021 9:46 PM
Hello
If you can explain these 3 lines
further:
while (! (Get_after (“+ IPD,”, 1, &
Link_ID, wifi_uart)));
Link_ID – = 48;
while (! (Copy_upto (“HTTP / 1.1”,
buftocopyinto, wifi_uart)));
What is transmitted in at-
commands?
Reply
amir
April 27, 2021 11:53 AM
Link_ID – = 48;
(48)==???
Reply
Kasem KWANGSAKUL
July 7, 2021 8:22 AM
That’s just to get an integer
from an ASCII data.
Reply
Pagiiiii
February 9, 2021 3:21 PM
Hello I am not able to receive the ip
address hercules screen shows only
RESETTING……after that it stops
from working…..what should i do so
that i would be able to receive the ip
address and open web page please
help me.
Thanks in advance
Reply
Lau Kian Siong
April 30, 2021 10:49 AM
i also encounter same issue like
u. how u solve it at the end, i
use the different stm32board.
Reply
Soroush
January 31, 2021 9:30 PM
hi, i cant download the zip file whats
the problem?
Reply
admin
January 31, 2021 10:19 PM
try now
Reply
Chris
November 18, 2020 3:00 AM
This is a nice tutorial, I have sort of
got it working but it randomly stops.
When i open the web pages it will let
me toggle the LED on or off a few
times, then the web page hangs,
does anyone have any ideas?
When the page hangs, every time I
refresh the page even though it
doesnt work the ESP8266 LED
flashes as if it is recieving the signal,
but the STM doesnt send the
webpage out
Any help is appreciated!
Thanks
Reply
Kasem KWANGSAKUL
November 10, 2020 2:06 PM
I have followed the video, it works
fine.
But when I try to use FreeRTOS and
move the Server_Start() into a task
then the task freezed. Need your
suggestion, thanks.
void StartHTTP_Server(void const *
argument)
{
/* USER CODE BEGIN
StartHTTP_Server */
/* Infinite loop */
for(;;)
{
Server_Start();
HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5);
osDelay(1);
}
/* USER CODE END
StartHTTP_Server */
}
Reply
admin
November 11, 2020 7:55 PM
it won’t work with freeRTOS.
Reply
Kasem KWANGSAKUL
November 12, 2020 11:31 AM
Thanks for the answer.
Is there anyway I can have
a HTTP server with
FreeRTOS?
Reply
Kasem KWANGSAKUL
November 14, 2020 8:47 AM
I, finally, found the answer.
Server_Handle() has declare an
array of 4096 byte. this cause
the function freezed.
I moved the array to be a global
variable then the
Server_Handle() works fine.
What I did may not be the best
solution but at least it made us
know the reason.
Reply
Chris
November 18, 2020 2:49 AM
Would you be able to share
that with me please? I have
sort of got this project
working but it hangs after
toggling the LED a few
times via the webpage and
I have no idea why.
Thanks
Reply
Arthur
September 24, 2020 12:45 AM
Hello kind Gentleman’s
I would like to ask if there is any
possibility for having both
server_start function and code such
as:
if(IsDataAvailable(pc_uart))
{
int data = Uart_read(pc_uart);
Uart_write(data, wifi_uart);
}
if(IsDataAvailable(wifi_uart))
{
int data = Uart_read(wifi_uart);
Uart_write(data, pc_uart);
}
in order of having simultaneously
server and possibility to change
config of ESP as shown in
https://controllerstech.com/managing-
multiple-uarts-in-stm32/ ??
Thank you in advance,
Love you all so much
Reply
admin
September 24, 2020 1:29 PM
i don’t think so. Server_start
uses the blocking mode and
look for the particular string in
the incoming data. You can try
this with freertos though. i am
not sure that it would work
Reply
Pedro
June 11, 2020 8:18 AM
Tudo bem!
Muito bom seu trabalho, poderia
postar um exemplo pro stm32f103?
Reply
admin
June 13, 2020 3:25 PM
This code works with F103 also.
I have tested it myself
Reply
Vũ Thị Hoàng Lan
May 21, 2020 10:03 PM
I download it and I did not find the
library ESP8266 HAL in this file. So
can you help me. Thank you so
much
Reply
admin
May 22, 2020 8:17 PM
look in the src and inc folders
Reply
lucas
April 29, 2020 7:20 PM
Bom dia!
copiei o exemplo para o stm32f103,
o mesmo não responde na serial
habilitei as interrupções!
Reply
admin
May 12, 2020 10:21 AM
watch the video. there is a lot
more setup you needed to do,
than to just copy.
I have tested it on f103 and it
works fine
Reply
Lucas
May 24, 2020 10:04 AM
Desculpa como expressei,
não apenas copiei habilitei
as configurações do clube
como interrupções da
usart, más quando mando
escrever qualquer
comando AT dentro
void ESP_Init, a função
trava já testei a função
Uart_sendstring para
escrever na serial uma
string está funcionando.
Reply
Denisa
April 25, 2020 10:51 PM
I succeded, thanks for tutorial!
Reply
Lucas
May 10, 2020 8:41 PM
Não estou tendo sucesso teria
como passa r como usou?
Reply
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