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implement basic http server

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This commit is contained in:
Arthur Lu 2024-02-13 18:01:59 -08:00
parent d7cfc0d782
commit c0e774c08c
11 changed files with 286 additions and 51 deletions
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1
.gitignore vendored
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@ -1,2 +1,3 @@
**/build/*
**/secret.h
**/htmldata.c

26
CMakeLists.txt
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@ -1,17 +1,21 @@
cmake_minimum_required(VERSION 3.13)
set(PROGRAM_NAME pico_bmc)
set(PICO_BOARD pico_w)
include(pico_sdk_import.cmake)
project(bmc)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)
project(pico_bmc)
pico_sdk_init()
add_executable(bmc
bmc.c
add_executable(${PROGRAM_NAME}
main.c
)
target_link_libraries(bmc
pico_stdlib
target_include_directories(${PROGRAM_NAME} PRIVATE
${CMAKE_CURRENT_LIST_DIR}
)
target_link_libraries(${PROGRAM_NAME}
pico_cyw43_arch_lwip_threadsafe_background
pico_lwip_http
pico_stdlib
hardware_adc
)
pico_enable_stdio_usb(bmc 1)
pico_enable_stdio_uart(bmc 0)
pico_add_extra_outputs(bmc)
target_include_directories(bmc PRIVATE ${CMAKE_CURRENT_LIST_DIR})
pico_enable_stdio_usb(${PROGRAM_NAME} TRUE)
pico_enable_stdio_uart(${PROGRAM_NAME} FALSE)
pico_add_extra_outputs(${PROGRAM_NAME})

15
Makefile
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@ -1,9 +1,16 @@
TOPTARGETS := all clean
#TOPTARGETS := all clean
SUBDIRS := $(wildcard */.)
SUBDIRS := build
all: makefsdata $(SUBDIRS)
makefsdata:
python3 makefsdata.py
clean: $(SUBDIRS)
rm -rf htmldata.c
$(TOPTARGETS): $(SUBDIRS)
$(SUBDIRS):
$(MAKE) -C $@ $(MAKECMDGOALS)
.PHONY: $(TOPTARGETS) $(SUBDIRS)
.PHONY: all makefsdata clean $(SUBDIRS)

25
bmc.c
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@ -1,25 +0,0 @@
#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include "secret.h"
int main() {
stdio_init_all();
if (cyw43_arch_init()) {
printf("Wi-Fi init failed\n");
return -1;
}
printf("Wi-Fi init succeeded\n");
cyw43_arch_enable_sta_mode();
if (cyw43_arch_wifi_connect_timeout_ms(ssid, pass, CYW43_AUTH_WPA2_AES_PSK, 10000)) {
printf("WiFi failed to connect\n");
return -1;
}
printf("WiFi connected\n");
while (true) {
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
sleep_ms(1000);
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
sleep_ms(1000);
}
}

32
cgi.h Normal file
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#include "lwip/apps/httpd.h"
#include "pico/cyw43_arch.h"
// CGI handler which is run when a request for /led.cgi is detected
const char * cgi_led_handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
{
// Check if an request for LED has been made (/led.cgi?led=x)
if (strcmp(pcParam[0] , "led") == 0){
// Look at the argument to check if LED is to be turned on (x=1) or off (x=0)
if(strcmp(pcValue[0], "0") == 0)
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
else if(strcmp(pcValue[0], "1") == 0)
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
}
// Send the index page back to the user
return "/index.shtml";
}
// tCGI Struct
// Fill this with all of the CGI requests and their respective handlers
static const tCGI cgi_handlers[] = {
{
// Html request for "/led.cgi" triggers cgi_handler
"/led.cgi", cgi_led_handler
},
};
void cgi_init(void)
{
http_set_cgi_handlers(cgi_handlers, 1);
}

20
html_files/index.shtml Normal file
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<!DOCTYPE html>
<html>
<head>
<title>PicoW Webserver</title>
</head>
<body> <h1>PicoW Webserver Tutorial</h1>
<br>
<h2>This bit is SSI:</h2>
<p>Voltage: <!--#volt--></p>
<p>Temp: <!--#temp--> C</p>
<p>LED is: <!--#led--></p>
<br>
<h2>This bit is CGI:</h2>
<a href="/led.cgi?led=1"><button>LED ON</button></a>
<a href="/led.cgi?led=0"><button>LED OFF</button></a>
<br>
<br>
<a href="/index.shtml">Refresh</a>
</body>
</html>

15
lwipopts.h
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@ -1,9 +1,5 @@
#ifndef _LWIPOPTS_EXAMPLE_COMMONH_H
#define _LWIPOPTS_EXAMPLE_COMMONH_H
// Common settings used in most of the pico_w examples
// (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html for details)
// (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html for details)]
// allow override in some examples
#ifndef NO_SYS
@ -87,4 +83,11 @@
#define SLIP_DEBUG LWIP_DBG_OFF
#define DHCP_DEBUG LWIP_DBG_OFF
#endif /* __LWIPOPTS_H__ */
// This section enables HTTPD server with SSI, SGI
// and tells server which converted HTML files to use
#define LWIP_HTTPD 1
#define LWIP_HTTPD_SSI 1
#define LWIP_HTTPD_CGI 1
#define LWIP_HTTPD_SSI_INCLUDE_TAG 0
#define HTTPD_SERVER_PORT 80
#define HTTPD_FSDATA_FILE "htmldata.c"

36
main.c Normal file
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#include "lwip/apps/httpd.h"
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include "lwipopts.h"
#include "ssi.h"
#include "cgi.h"
#include "secret.h"
int main() {
stdio_init_all();
if (cyw43_arch_init()) {
printf("Wi-Fi init failed\n");
return -1;
}
printf("Wi-Fi init succeeded\n");
cyw43_arch_enable_sta_mode();
if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASS, CYW43_AUTH_WPA2_AES_PSK, 30000)){
printf("Wi-Fi failed to connect\n");
return -1;
}
printf("Wi-Fi connected\n");
httpd_init();
printf("HTTP Server initialized at %s on port %d\n", ip4addr_ntoa(netif_ip4_addr(netif_list)), HTTPD_SERVER_PORT);
ssi_init();
printf("SSI Handler initialized\n");
cgi_init();
printf("CGI Handler initialised\n");
while(1);
}

106
makefsdata.py Normal file
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#!/usr/bin/python3
# This script is by @rspeir on GitHub:
# https://github.com/krzmaz/pico-w-webserver-example/pull/1/files/4b3e78351dd236f213da9bebbb20df690d470476#diff-e675c4a367e382db6f9ba61833a58c62029d8c71c3156a9f238b612b69de279d
# Renamed output to avoid linking incorrect file
import os
import binascii
#Create file to write output into
output = open('htmldata.c', 'w')
#Traverse directory, generate list of files
files = list()
os.chdir('./html_files')
for(dirpath, dirnames, filenames) in os.walk('.'):
files += [os.path.join(dirpath, file) for file in filenames]
filenames = list()
varnames = list()
#Generate appropriate HTTP headers
for file in files:
if '404' in file:
header = "HTTP/1.0 404 File not found\r\n"
else:
header = "HTTP/1.0 200 OK\r\n"
header += "Server: lwIP/pre-0.6 (http://www.sics.se/~adam/lwip/)\r\n"
if '.html' in file:
header += "Content-type: text/html\r\n"
elif '.shtml' in file:
header += "Content-type: text/html\r\n"
elif '.jpg' in file:
header += "Content-type: image/jpeg\r\n"
elif '.gif' in file:
header += "Content-type: image/gif\r\n"
elif '.png' in file:
header += "Content-type: image/png\r\n"
elif '.class' in file:
header += "Content-type: application/octet-stream\r\n"
elif '.js' in file:
header += "Content-type: text/javascript\r\n"
elif '.css' in file:
header += "Content-type: text/css\r\n"
elif '.svg' in file:
header += "Content-type: image/svg+xml\r\n"
else:
header += "Content-type: text/plain\r\n"
header += "\r\n"
fvar = file[1:] #remove leading dot in filename
fvar = fvar.replace('/', '_') #replace *nix path separator with underscore
fvar = fvar.replace('\\', '_') #replace DOS path separator with underscore
fvar = fvar.replace('.', '_') #replace file extension dot with underscore
output.write("static const unsigned char data{}[] = {{\n".format(fvar))
output.write("\t/* {} */\n\t".format(file))
#first set of hex data encodes the filename
b = bytes(file[1:].replace('\\', '/'), 'utf-8') #change DOS path separator to forward slash
for byte in binascii.hexlify(b, b' ', 1).split():
output.write("0x{}, ".format(byte.decode()))
output.write("0,\n\t")
#second set of hex data is the HTTP header/mime type we generated above
b = bytes(header, 'utf-8')
count = 0
for byte in binascii.hexlify(b, b' ', 1).split():
output.write("0x{}, ".format(byte.decode()))
count = count + 1
if(count == 10):
output.write("\n\t")
count = 0
output.write("\n\t")
#finally, dump raw hex data from files
with open(file, 'rb') as f:
count = 0
while(byte := f.read(1)):
byte = binascii.hexlify(byte)
output.write("0x{}, ".format(byte.decode()))
count = count + 1
if(count == 10):
output.write("\n\t")
count = 0
output.write("};\n\n")
filenames.append(file[1:])
varnames.append(fvar)
for i in range(len(filenames)):
prevfile = "NULL"
if(i > 0):
prevfile = "file" + varnames[i-1]
output.write("const struct fsdata_file file{0}[] = {{{{ {1}, data{2}, ".format(varnames[i], prevfile, varnames[i]))
output.write("data{} + {}, ".format(varnames[i], len(filenames[i]) + 1))
output.write("sizeof(data{}) - {}, ".format(varnames[i], len(filenames[i]) + 1))
output.write("FS_FILE_FLAGS_HEADER_INCLUDED | FS_FILE_FLAGS_HEADER_PERSISTENT}};\n")
output.write("\n#define FS_ROOT file{}\n".format(varnames[-1]))
output.write("#define FS_NUMFILES {}\n".format(len(filenames)))

51
ssi.h Normal file
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#include "lwip/apps/httpd.h"
#include "pico/cyw43_arch.h"
#include "hardware/adc.h"
// SSI tags - tag length limited to 8 bytes by default
const char * ssi_tags[] = {"volt","temp","led"};
u16_t ssi_handler(int iIndex, char *pcInsert, int iInsertLen) {
size_t printed;
switch (iIndex) {
case 0: // volt
{
const float voltage = adc_read() * 3.3f / (1 << 12);
printed = snprintf(pcInsert, iInsertLen, "%f", voltage);
}
break;
case 1: // temp
{
const float voltage = adc_read() * 3.3f / (1 << 12);
const float tempC = 27.0f - (voltage - 0.706f) / 0.001721f;
printed = snprintf(pcInsert, iInsertLen, "%f", tempC);
}
break;
case 2: // led
{
bool led_status = cyw43_arch_gpio_get(CYW43_WL_GPIO_LED_PIN);
if(led_status == true){
printed = snprintf(pcInsert, iInsertLen, "ON");
}
else{
printed = snprintf(pcInsert, iInsertLen, "OFF");
}
}
break;
default:
printed = 0;
break;
}
return (u16_t)printed;
}
// Initialise the SSI handler
void ssi_init() {
// Initialise ADC (internal pin)
adc_init();
adc_set_temp_sensor_enabled(true);
adc_select_input(4);
http_set_ssi_handler(ssi_handler, ssi_tags, LWIP_ARRAYSIZE(ssi_tags));
}

4
template.secret.h
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@ -1,7 +1,7 @@
#ifndef SECRET_H
#define SECRET_H
char ssid[] = "wifi ssid";
char pass[] = "wifi pass";
const char WIFI_SSID[] = "ssid";
const char WIFI_PASS[] = "pass";
#endif