Implement Access Point in setup mode

Closes #6

src/CMakeLists.txt

@@ -21,6 +21,8 @@ file(RENAME fsdata.c my_fsdata.c)
 add_executable(${PROGRAM_NAME}
         main.cpp
         double_reset_detector.cpp
+        access_point.cpp
+        http_server.cpp
         )
 target_compile_definitions(${PROGRAM_NAME} PRIVATE
         WIFI_SSID=\"${WIFI_SSID}\"

src/access_point.cpp

@@ -0,0 +1,39 @@
+#include "access_point.h"
+
+#include <cyw43.h>
+#include <lwip/autoip.h>
+#include <pico/cyw43_arch.h>
+
+namespace access_point {
+
+int stop_access_point(){
+    autoip_stop(&cyw43_state.netif[CYW43_ITF_AP]);
+    return 0;
+}
+
+int setup_access_point() {
+    if (!cyw43_is_initialized(&cyw43_state)){
+        if (cyw43_arch_init()) {
+            printf("failed to initialise\n");
+            return 1;
+        }
+    }
+
+    const char *ap_name = "picow_webserver";
+    const char *password = NULL;
+
+    cyw43_arch_enable_ap_mode(ap_name, password, CYW43_AUTH_WPA2_AES_PSK);
+    // sleep mostly to let serial monitor catch the ip log. probably to be removed once mDNS is set up
+    sleep_ms(2000);
+
+    autoip_start(&cyw43_state.netif[CYW43_ITF_AP]);
+    auto link_local_ip_addr = netif_autoip_data(&cyw43_state.netif[CYW43_ITF_AP])->llipaddr.addr;
+    printf("IP Address: %lu.%lu.%lu.%lu\n",
+        link_local_ip_addr & 0xFF,
+        (link_local_ip_addr >> 8) & 0xFF,
+        (link_local_ip_addr >> 16) & 0xFF,
+        link_local_ip_addr >> 24);
+    return 0;
+}
+
+} // namespace access_point

src/access_point.h

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace access_point {
+    int stop_access_point();
+
+    int setup_access_point();
+} // namespace access_point

src/double_reset_detector.h

@@ -0,0 +1,6 @@
+#pragma once
+namespace double_reset_detector {
+
+extern bool double_reset_detected;
+
+} // namespace double_reset_detector

src/ssi.h → src/http_server.cpp

@@ -1,11 +1,11 @@
-#pragma once
-
 #include "hardware/adc.h"
 #include "lwip/apps/httpd.h"
 #include "pico/cyw43_arch.h"
 
 #include "lwipopts.h"
 
+namespace http_server {
+
 // max length of the tags defaults to be 8 chars
 // LWIP_HTTPD_MAX_TAG_NAME_LEN
 const char * __not_in_flash("httpd") ssi_example_tags[] = {
@@ -54,3 +54,10 @@ void ssi_init() {
     ssi_example_tags, LWIP_ARRAYSIZE(ssi_example_tags)
     );
 }
+
+void start_http_server() {
+    httpd_init();
+    ssi_init();
+    printf("Http server initialized.\n");
+}
+} // namespace http_server

src/http_server.h

@@ -0,0 +1,4 @@
+#pragma once
+namespace http_server {
+    void start_http_server();
+} // namespace http_server

src/lwipopts.h

@@ -55,6 +55,8 @@
 #define LWIP_STATS_DISPLAY          1
 #endif
 
+#define LWIP_AUTOIP 1
+
 #define LWIP_HTTPD 1
 #define LWIP_HTTPD_SSI 1
 // don't include the tag comment - less work for the CPU, but may be harder to debug

src/main.cpp

@@ -1,13 +1,16 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include "lwip/apps/httpd.h"
-#include "lwip/err.h"
-#include "pico/stdlib.h"
-#include "pico/cyw43_arch.h"
+#include <lwip/err.h>
+#include <pico/stdlib.h>
+#include <pico/cyw43_arch.h>
+
+#include "double_reset_detector.h"
+#include "http_server.h"
+#include "access_point.h"
 
 #include "lwipopts.h"
-#include "ssi.h"
+
 namespace double_reset_detector {
     extern bool double_reset_detected;
 }
@@ -26,28 +29,17 @@ int connect_to_wifi() {
     } else {
         printf("Connected.\n");
 
-        extern cyw43_t cyw43_state;
         auto ip_addr = cyw43_state.netif[CYW43_ITF_STA].ip_addr.addr;
         printf("IP Address: %lu.%lu.%lu.%lu\n", ip_addr & 0xFF, (ip_addr >> 8) & 0xFF, (ip_addr >> 16) & 0xFF, ip_addr >> 24);
     }
     return ERR_OK;
 }
 
-void run_server() {
-    if (connect_to_wifi() != ERR_OK){
-        return;
-    }
-    httpd_init();
-    ssi_init();
-    printf("Http server initialized.\n");
-    // infinite loop for now
-    for (;;) {}
-}
-
 void setup() {
     if (double_reset_detector::double_reset_detected) {
         printf("Double reset detected!\n");
-        // just blink the LED for now
+        access_point::setup_access_point();
+        http_server::start_http_server();
         while (true) {
             cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
             sleep_ms(500);
@@ -67,5 +59,9 @@ int main() {
     // turn on LED to distinguish from BOOTSEL mode
     cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
     setup();
-    run_server();
+    if (connect_to_wifi() != ERR_OK) {
+        return 1;
+    }
+    http_server::start_http_server();
+    while (true) {};
 }