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ESP8266|RPi pico 通过ESP8266搭建web服务器(树莓派pico通过esp8266联网)

文章目录

  • 前言
  • 软件准备
  • 硬件准备
  • 接线
  • C/C++实现代码
    • 实验现象
  • Micropython实现代码
    • 实验现象
  • 参考资料

前言

  • Raspberry pi pico官网介绍:https://www.raspberrypi.org/documentation/rp2040/getting-started/#board-specifications
  • ESP8266官网介绍:https://www.espressif.com/zh-hans/products/socs/esp8266

软件准备

根据树莓派官网的介绍,基于Raspberry pi pico我们可以搭建两种开发环境: Micropython和C/C++

关于开发环境的搭建,国内已经有很多优秀的课程了,我是参考韦东山百问网出的教程搭建的开发环境:

  • Micropython:https://www.bilibili.com/video/BV1ZK411c7yf?p=4
  • C/C++:https://www.bilibili.com/video/BV1ZK411c7yf?p=5

硬件准备

在开始实验之前,需要准备好一下的硬件:
Raspberry pi pico开发板
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ESP8266串口wifi
在这里插入图片描述

接线

uart0我用于串口模块连接到PC显示串口信息,所以我从uart1开始使用,uart1分配给ESP8266使用。

pico引脚ESP8266引脚
VBUSVCC、CH-EN
GNDGND
UART1TX Pin6U0RXD
UART1RX Pin7U0TXD

在这里插入图片描述

C/C++实现代码

/**
 * Copyright (c) 2008-2021 深圳百问网科技有限公司<https://www.100ask.net/>
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <string.h>
#include <stdio.h>
#include <math.h>
#include "pico/stdlib.h"
#include "pico/multicore.h"
#include "hardware/gpio.h"
#include "hardware/uart.h"

#define UART_ID uart1
#define BAUD_RATE 115200

#define UART_TX_PIN 4
#define UART_RX_PIN 5

#define RECV_BUFFER 256
char recv_buf[RECV_BUFFER];
int buff_count = 0;

void core1_entry() 
{
    memset(recv_buf,'0',RECV_BUFFER);
    while (1) {
        //printf("%c", uart_getc(UART_ID));
        recv_buf[buff_count++] = uart_getc(UART_ID);         
        if(buff_count >= RECV_BUFFER )   buff_count = 0;
    }
}

int main() {
    stdio_init_all();

    // Set up our UART with the required speed.
    uart_init(UART_ID, BAUD_RATE);

    // Set the TX and RX pins by using the function select on the GPIO
    // Set datasheet for more information on function select
    gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
    gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);

    multicore_launch_core1(core1_entry);

    printf("Setting up network on ESP8266...\n");
    printf("  - Setting CWMODE to 1 station mode...\n");
    uart_puts(UART_ID, "AT+CWMODE=1\r\n");
    sleep_ms(2000);
    printf("  - Joining Wifi ...'\n");
    uart_puts(UART_ID, "AT+CWJAP=\"baiwenwang\",\"www.100ask.org\"\r\n");
    sleep_ms(5000);
    printf("done!\n\n");

    printf("Starting Webserver port on ESP8266...\n");
    sleep_ms(1000);
    printf("  - Setting CIPMUX for multiple connections...\n");
    uart_puts(UART_ID, "AT+CIPMUX=1\r\n");
    sleep_ms(2000);
    printf("  - Starting CIPSERVER on port 80...\n");
    uart_puts(UART_ID, "AT+CIPSERVER=1,80\r\n");
    printf("done!\n\n");

    sleep_ms(1000);
    // 查询本地 IP 地址
    uart_puts(UART_ID, "AT+CIFSR\r\n");
    sleep_ms(1000);
    printf("%s\n", recv_buf);  
    printf("Waiting For connection...\n");
    while (true) {
        if (strstr(recv_buf, "+IPD"))
        {    
            printf("! Incoming connection - sending webpage");
            uart_puts(UART_ID, "AT+CIPSEND=0,108\r\n");  // Send a HTTP response then a webpage as bytes the 108 is the amount of bytes you are sending, change this if you change the data sent below
            sleep_ms(1000);
            uart_puts(UART_ID, "HTTP/1.1 200 OK\r\n");
            uart_puts(UART_ID, "Content-Type: text/html\r\n");
            uart_puts(UART_ID, "Connection: close\r\n");
            uart_puts(UART_ID, "\r\n");
            uart_puts(UART_ID, "<!DOCTYPE HTML>\r\n");
            uart_puts(UART_ID, "<html>\r\n");
            uart_puts(UART_ID, "It Works!\r\n");
            uart_puts(UART_ID, "</html>\r\n");
            sleep_ms(1000);
            uart_puts(UART_ID, "AT+CIPCLOSE=0\r\n");    // close the connection when done.
            sleep_ms(4000);
            printf("\n\nWaiting For connection...\n");
            sleep_ms(250);
            memset(recv_buf,'0',RECV_BUFFER);
            buff_count = 0;
        }
    }
}

实验现象

在这里插入图片描述

Micropython实现代码

#
# Copyright © 2021 深圳百问网科技有限公司 All Rights Reserved.
# https://www.100ask.net
# https://shop502068889.taobao.com/
#
# SPDX-License-Identifier: BSD-3-Clause
#

from machine import UART
import machine
import _thread
import time
recv_buf="" # receive buffer global variable

print('-- ESP8266 Webserver --')
print (' ')
print ('setting up UART Connection...')
uart = UART(1,115200) # create a UART serial connection using UART1 pins and a baud of 115200
print ('done!')
print (' ')

#Function to read serial response from UART serial into buffer one byte at a time
def uartSerialRxMonitor():
    recv=""
    
    while True:
        recv=str(uart.read(1).decode("utf-8"))
        print(recv, end='')
        global recv_buf
        recv_buf=recv_buf+recv

print ('Starting connection to ESP8266...')
_thread.start_new_thread(uartSerialRxMonitor, ()) # start serial monitor as a thread
print ('done!')
print (' ')

print ('Setting up network on ESP8266...')
print ('  - Setting CWMODE to 1 station mode...')
uart.write('AT+CWMODE=1'+'\r\n')
time.sleep(2)
print ('  - Joining Wifi ...')
uart.write('AT+CWJAP="baiwenwang","www.100ask.org"'+'\r\n') # set Wifi network SSID and password here
time.sleep(5)
print ('done!')
print (' ')

print ('Starting Webserver port on ESP8266...')
time.sleep(4)
print ('  - Setting CIPMUX for multiple connections...')
uart.write('AT+CIPMUX=1'+'\r\n')
time.sleep(2)
print ('  - Starting CIPSERVER on port 80...')
uart.write('AT+CIPSERVER=1,80'+'\r\n')
print ('done!')
print (' ')

time.sleep(1)
print (' ')
print ('Waiting For connection...')
while True:
    if '+IPD' in recv_buf: #IPD in serial indicates an incoming connection
        time.sleep(2)
        print ('! Incoming connection - sending webpage')
        uart.write('AT+CIPSEND=0,108'+'\r\n') #Send a HTTP response then a webpage as bytes the 108 is the amount of bytes you are sending, change this if you change the data sent below
        time.sleep(1)
        uart.write('HTTP/1.1 200 OK'+'\r\n')
        uart.write('Content-Type: text/html'+'\r\n')
        uart.write('Connection: close'+'\r\n')
        uart.write(''+'\r\n')
        uart.write('<!DOCTYPE HTML>'+'\r\n')
        uart.write('<html>'+'\r\n')
        uart.write('It Works!'+'\r\n')
        uart.write('</html>'+'\r\n')
        time.sleep(1)
        uart.write('AT+CIPCLOSE=0'+'\r\n') # close the connection when done.
        time.sleep(4)
        print (' ')
        print (' ')
        print ('Waiting For connection...')
        recv_buf=""

实验现象

在这里插入图片描述

参考资料

ESP8266 AT指令集


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