树莓派还是esp8266
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参考技术A 以前买的esp8266，自己定制系统，玩无线联网，语音控制，现在买了树莓派，很纠结哪个更好一点，树莓功能强，而esp8266,小巧好玩。看看再说。ESP8266|RPi pico 通过ESP8266搭建web服务器(树莓派pico通过esp8266联网)
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
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 |
|---|---|
| VBUS | VCC、CH-EN |
| GND | GND |
| UART1TX Pin6 | U0RXD |
| UART1RX Pin7 | U0TXD |
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
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
参考资料
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