Page 2 of 11
CHAPTER 1
Page 20 WiFi Simple Connect Main program
#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
int setup(uint32_t country, const char *ssid, const char *pass, uint32_t auth)
{
if (cyw43_arch_init_with_country(country))
{
return 1;
}
cyw43_arch_enable_sta_mode();
if (cyw43_arch_wifi_connect_blocking(ssid, pass, auth))
{
return 2;
}
}
char ssid[] = "myhost";
char pass[] = "mypassword";
uint32_t country = CYW43_COUNTRY_mycountry;
uint32_t auth = CYW43_AUTH_WPA2_MIXED_PSK;
int main()
{
stdio_init_all();
setup(country, ssid, pass, auth);
while (true)
{
sleep_ms(1);
}
}
Page 21 WiFi Connect CMakeLists.txt
cmake_minimum_required(VERSION 3.13)
set(PICO_BOARD pico_w)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)
include(pico_sdk_import.cmake)
project(PicoW C CXX ASM)
pico_sdk_init()
add_executable(main
main.c
)
target_include_directories(main PRIVATE ${CMAKE_CURRENT_LIST_DIR})
target_link_libraries(main pico_stdlib pico_cyw43_arch_lwip_threadsafe_background )
pico_add_extra_outputs(main)
Page 21 WiFi Connect lwiopts.h - basic configuration file not listed in book
#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)
// allow override in some examples
#ifndef NO_SYS
#define NO_SYS 1
#endif
// allow override in some examples
#ifndef LWIP_SOCKET
#define LWIP_SOCKET 0
#endif
#if PICO_CYW43_ARCH_POLL
#define MEM_LIBC_MALLOC 1
#else
// MEM_LIBC_MALLOC is incompatible with non polling versions
#define MEM_LIBC_MALLOC 0
#endif
#define MEM_ALIGNMENT 4
#define MEM_SIZE 4000
#define MEMP_NUM_TCP_SEG 32
#define MEMP_NUM_ARP_QUEUE 10
#define PBUF_POOL_SIZE 24
#define LWIP_ARP 1
#define LWIP_ETHERNET 1
#define LWIP_ICMP 1
#define LWIP_RAW 1
#define TCP_WND (8 * TCP_MSS)
#define TCP_MSS 1460
#define TCP_SND_BUF (8 * TCP_MSS)
#define TCP_SND_QUEUELEN ((4 * (TCP_SND_BUF) + (TCP_MSS - 1)) / (TCP_MSS))
#define LWIP_NETIF_STATUS_CALLBACK 1
#define LWIP_NETIF_LINK_CALLBACK 1
#define LWIP_NETIF_HOSTNAME 1
#define LWIP_NETCONN 0
#define MEM_STATS 0
#define SYS_STATS 0
#define MEMP_STATS 0
#define LINK_STATS 0
// #define ETH_PAD_SIZE 2
#define LWIP_CHKSUM_ALGORITHM 3
#define LWIP_DHCP 1
#define LWIP_IPV4 1
#define LWIP_TCP 1
#define LWIP_UDP 1
#define LWIP_DNS 1
#define LWIP_TCP_KEEPALIVE 1
#define LWIP_NETIF_TX_SINGLE_PBUF 1
#define DHCP_DOES_ARP_CHECK 0
#define LWIP_DHCP_DOES_ACD_CHECK 0
#ifndef NDEBUG
#define LWIP_DEBUG 1
#define LWIP_STATS 1
#define LWIP_STATS_DISPLAY 1
#endif
#define ETHARP_DEBUG LWIP_DBG_OFF
#define NETIF_DEBUG LWIP_DBG_OFF
#define PBUF_DEBUG LWIP_DBG_OFF
#define API_LIB_DEBUG LWIP_DBG_OFF
#define API_MSG_DEBUG LWIP_DBG_OFF
#define SOCKETS_DEBUG LWIP_DBG_OFF
#define ICMP_DEBUG LWIP_DBG_OFF
#define INET_DEBUG LWIP_DBG_OFF
#define IP_DEBUG LWIP_DBG_OFF
#define IP_REASS_DEBUG LWIP_DBG_OFF
#define RAW_DEBUG LWIP_DBG_OFF
#define MEM_DEBUG LWIP_DBG_OFF
#define MEMP_DEBUG LWIP_DBG_OFF
#define SYS_DEBUG LWIP_DBG_OFF
#define TCP_DEBUG LWIP_DBG_OFF
#define TCP_INPUT_DEBUG LWIP_DBG_OFF
#define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
#define TCP_RTO_DEBUG LWIP_DBG_OFF
#define TCP_CWND_DEBUG LWIP_DBG_OFF
#define TCP_WND_DEBUG LWIP_DBG_OFF
#define TCP_FR_DEBUG LWIP_DBG_OFF
#define TCP_QLEN_DEBUG LWIP_DBG_OFF
#define TCP_RST_DEBUG LWIP_DBG_OFF
#define UDP_DEBUG LWIP_DBG_OFF
#define TCPIP_DEBUG LWIP_DBG_OFF
#define PPP_DEBUG LWIP_DBG_OFF
#define SLIP_DEBUG LWIP_DBG_OFF
#define DHCP_DEBUG LWIP_DBG_OFF
#endif /* __LWIPOPTS_H__ */
Page 25 WiFi Connect setupWifi.h - used in most examples to connect to the AP.
int setup(uint32_t country, const char *ssid, const char *pass,
uint32_t auth, const char *hostname, ip_addr_t *ip,
ip_addr_t *mask, ip_addr_t *gw)
{
if (cyw43_arch_init_with_country(country))
{
return 1;
}
cyw43_arch_enable_sta_mode();
if (hostname != NULL)
{
netif_set_hostname(netif_default, hostname);
}
if (cyw43_arch_wifi_connect_async(ssid, pass, auth))
{
return 2;
}
int flashrate = 1000;
int status = CYW43_LINK_UP + 1;
while (status >= 0 && status != CYW43_LINK_UP)
{
int new_status = cyw43_tcpip_link_status(&cyw43_state,
CYW43_ITF_STA);
if (new_status != status)
{
status = new_status;
flashrate = flashrate / (status + 1);
printf("connect status: %d %d\n", status, flashrate);
}
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
sleep_ms(flashrate);
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
sleep_ms(flashrate);
}
if (status < 0)
{
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
}
else
{
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
if (ip != NULL)
{
netif_set_ipaddr(netif_default, ip);
}
if (mask != NULL)
{
netif_set_netmask(netif_default, mask);
}
if (gw != NULL)
{
netif_set_gw(netif_default, gw);
}
printf("IP: %s\n",
ip4addr_ntoa(netif_ip_addr4(netif_default)));
printf("Mask: %s\n",
ip4addr_ntoa(netif_ip_netmask4(netif_default)));
printf("Gateway: %s\n",
ip4addr_ntoa(netif_ip_gw4(netif_default)));
printf("Host Name: %s\n",
netif_get_hostname(netif_default));
}
return status;
}
int connect()
{
char ssid[] = "ssid";
char pass[] = "password";
uint32_t country = CYW43_COUNTRY_code;
uint32_t auth = CYW43_AUTH_WPA2_MIXED_PSK;
return setup(country, ssid, pass, auth, "MyPicoW", NULL, NULL, NULL);
}
Page 28 Scan main program
#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
static int scan_result(void *env, const cyw43_ev_scan_result_t *result)
{
if (result)
{
printf("ssid: %-32s rssi: %4d chan: %3d mac: %02x:%02x:%02x:%02x:%02x:%02x sec: %u\n",
result->ssid, result->rssi, result->channel,
result->bssid[0], result->bssid[1], result->bssid[2], result->bssid[3], result->bssid[4], result->bssid[5],
result->auth_mode);
}
return 0;
}
int main()
{
stdio_init_all();
if (cyw43_arch_init())
{
printf("failed to initialise\n");
return 1;
}
cyw43_arch_enable_sta_mode();
cyw43_wifi_set_up(&cyw43_state, CYW43_ITF_STA, true, CYW43_COUNTRY_UK);
cyw43_wifi_scan_options_t scan_options = {0};
int err = cyw43_wifi_scan(&cyw43_state, &scan_options, NULL, scan_result);
while (true)
{
if (!cyw43_wifi_scan_active(&cyw43_state))
break;
sleep_ms(1000);
printf("Scan in progress \n");
}
printf("Scan Complete\n");
cyw43_arch_deinit();
return 0;
}
Page 29 Get RSSI main program
#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include "setupWifi.h"
int main()
{
stdio_init_all();
connect();
int32_t rssi;
while (true)
{
sleep_ms(1000);
cyw43_wifi_get_rssi(&cyw43_state, &rssi);
printf("rssi: %d \n", rssi);
}
}
