Added cgi

.gitignore

@@ -6,3 +6,7 @@ cmake/pico_sdk_import.cmake
 # clangd stuff
 .cache
 compile_commands.json
+
+#kate backups
+*~
+

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.19)
+cmake_minimum_required(VERSION 3.18)
 
 find_package(Perl)
 if(NOT PERL_FOUND)

src/CMakeLists.txt

@@ -14,12 +14,13 @@ execute_process(COMMAND
         WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}
         ECHO_OUTPUT_VARIABLE
         ECHO_ERROR_VARIABLE
-        COMMAND_ERROR_IS_FATAL ANY
+#        COMMAND_ERROR_IS_FATAL ANY
         )
 file(RENAME fsdata.c my_fsdata.c)
 
 add_executable(${PROGRAM_NAME}
         main.cpp
+        cgi.cpp
         )
 target_compile_definitions(${PROGRAM_NAME} PRIVATE
         WIFI_SSID=\"${WIFI_SSID}\"
@@ -37,7 +38,7 @@ target_link_libraries(${PROGRAM_NAME}
         )
 
 pico_enable_stdio_usb(${PROGRAM_NAME} TRUE)
-pico_enable_stdio_uart(${PROGRAM_NAME} FALSE)
+pico_enable_stdio_uart(${PROGRAM_NAME} TRUE)
 suppress_tinyusb_warnings()
 
 pico_add_extra_outputs(${PROGRAM_NAME})

src/cgi.cpp

@@ -0,0 +1,138 @@
+#include "lwip/apps/httpd.h"
+#include "pico/cyw43_arch.h"
+#include "lwipopts.h"
+#include "cgi.h"
+
+
+static const tCGI cgi_handlers[] = {
+    {
+        /* Html request for "/leds.cgi" will start cgi_handler_basic */
+        "/leds.cgi", cgi_handler_basic
+    },
+    {
+        /* Html request for "/leds2.cgi" will start cgi_handler_extended */
+        "/leds_ext.cgi", cgi_handler_extended
+    }
+};
+
+
+
+/* cgi-handler triggered by a request for "/leds.cgi" */
+const char *
+cgi_handler_basic(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
+{
+    int i=0;
+
+    /* We use this handler only for one page request ("/leds.cgi")
+     * and it is at position 0 in the tCGI array (see above).
+     * So iIndex should be 0.
+     */
+    LWIP_ASSERT("cgi_handler_basic called with wrong index", iIndex == 0);
+
+    /* All leds off */
+    Led_Off(LED1);
+    Led_Off(LED2);
+    Led_Off(LED3);
+    Led_Off(LED4);
+
+    /* Check the query string.
+     * A request to turn LED2 and LED4 on would look like: "/leds.cgi?led=2&led=4"
+     */
+    for (i = 0; i < iNumParams; i++){
+        /* check if parameter is "led" */
+        if (strcmp(pcParam[i] , "led") == 0){
+            /* look ar argument to find which led to turn on */
+            if(strcmp(pcValue[i], "1") == 0)
+                Led_On(LED1);
+            else if(strcmp(pcValue[i], "2") == 0)
+                Led_On(LED2);
+            else if(strcmp(pcValue[i], "3") == 0)
+                Led_On(LED3);
+            else if(strcmp(pcValue[i], "4") == 0)
+                Led_On(LED4);
+        }
+    }
+
+    /* Our response to the "SUBMIT" is to simply send the same page again*/
+    return "/cgi.html";
+}
+
+/* cgi-handler triggered by a request for "/leds_ext.cgi".
+ *
+ * It is almost identical to cgi_handler_basic().
+ * Both handlers could be easily implemented in one function -
+ * distinguish them by looking at the iIndex parameter.
+ * I left it this way to show how to implement two (or more)
+ * enirely different handlers.
+ */
+const char *
+cgi_handler_extended(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
+{
+    int i=0;
+
+    /* We use this handler only for one request ("/leds_ext.cgi")
+     * and it is at position 1 in the tCGI array (see above).
+     * So iIndex should be 1.
+     */
+    LWIP_ASSERT("cgi_handler_basic called with wrong index", iIndex == 1);
+
+    /* All leds off */
+    Led_Off(LED1);
+    Led_Off(LED2);
+    Led_Off(LED3);
+    Led_Off(LED4);
+
+    /* Check the query string.
+     * A request to turn LED2 and LED4 on would look like: "/leds.cgi?led=2&led=4"
+     */
+    for (i = 0; i < iNumParams; i++){
+        /* check if parameter is "led" */
+        if (strcmp(pcParam[i] , "led") == 0){
+            /* look ar argument to find which led to turn on */
+            if(strcmp(pcValue[i], "1") == 0)
+                Led_On(LED1);
+            else if(strcmp(pcValue[i], "2") == 0)
+                Led_On(LED2);
+            else if(strcmp(pcValue[i], "3") == 0)
+                Led_On(LED3);
+            else if(strcmp(pcValue[i], "4") == 0)
+                Led_On(LED4);
+        }
+    }
+
+    /* Our response to the "SUBMIT" is to send "/ssi_cgi.shtml".
+     * The extension ".shtml" tells the server to insert some values
+     * which show the user what has been done in response.
+     */
+    return "/ssi_cgi.shtml";
+}
+
+/* initialize the CGI handler */
+void
+cgi_init(void)
+{
+    http_set_cgi_handlers(cgi_handlers, 2);
+
+    for(int i = LED1; i <= LED4; i++){
+        gpio_init(i);
+        gpio_set_dir(i, GPIO_OUT);
+        gpio_put(i, 0);
+    }
+}
+
+/* led control and debugging info */
+void
+Led_On(int led)
+{
+    printf("GPIO%d on\n", led);
+    gpio_put(led, 1);
+}
+
+void
+Led_Off(int led)
+{
+    printf("GPIO%d off\n", led);
+    gpio_put(led, 0);
+}
+
+

src/cgi.h

@@ -0,0 +1,23 @@
+#ifndef __CGI_H__
+#define __CGI_H__
+
+// GPIOs for Leds
+#define LED1	18
+#define LED2	19
+#define LED3	20
+#define LED4	21
+
+/* initialize the CGI handler */
+void  cgi_init(void);
+
+/* CGI handler for LED control */
+const char * cgi_handler_basic(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);
+/* CGI handler for LED control with feedback*/
+const char * cgi_handler_extended(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);
+
+
+/* led control and debugging info */
+void Led_On(int led);
+void Led_Off(int led);
+
+#endif // __CGI_H__

src/fs/cgi.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+    <head> <title>Pico W CGI-PAGE</title> </head>
+    <body> <h1>Pico W</h1>
+    <h3>CGI-PAGE</h3>
+
+	<span>
+	This page allows you to control four leds: LED1, LED2, LED3 and LED4 connected to GPIO18 - 21<br><br>
+	To turn a led on/off check/uncheck its corresponding checkbox.<br>
+	Then click on the "Send" button to submit the changes.<br>
+	</span>
+	<br>
+	<form method="get" action="/leds.cgi">
+		<input value="1" name="led" type="checkbox">LED1<br>
+		<input value="2" name="led" type="checkbox">LED2<br>
+		<input value="3" name="led" type="checkbox">LED3<br>
+		<input value="4" name="led" type="checkbox">LED4<br>
+		<br>
+		<input value="Send" type="submit">
+	</form>
+	<br>
+	<br>
+    <a href="/index.html">Back</a>
+	</body>
+</html>

src/fs/index.html

@@ -3,5 +3,11 @@
     <head> <title>Pico W</title> </head>
     <body> <h1>Pico W</h1>
         <p>Hello World</p>
-    </body>
-</html>
+        <br>
+        <br>
+        <br>
+        <a href="/ssi.shtml">&nbsp;ssi-page: Counter and Voltage</a><br>
+        <a href="/cgi.html">&nbsp;cgi-page: Ledcontrol</span></a><br>
+        <a href="/ssi_cgi.shtml">&nbsp;cgi-page: Ledcontrol with feedback</span></a><br>
+   </body>
+</html>

src/fs/ssi.shtml

@@ -1,8 +1,13 @@
 <!DOCTYPE html>
 <html>
-    <head> <title>Pico W</title> </head>
-    <body> <h1>Pico W</h1>
+    <head> <title>Pico W SSI-PAGE</title> </head>
+    <body>
+    <h1>Pico W</h1>
+    <h3>SSI-PAGE</h3>
         <p><!--#Hello--> Times <!--#counter-->!</p>
         <p>GPIO26 voltage is: <!--#GPIO-->!</p>
+	<br>
+	<br>
+    <a href="/index.html">Back</a>
     </body>
-</html>
+</html>

src/fs/ssi_cgi.shtml

@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+    <head> <title>Pico W CGI-SSI-PAGE</title> </head>
+    <body> <h1>Pico W</h1>
+    <h3>CGI with Feedback (ssi) PAGE</h3>
+
+	<span>
+	This page allows you to control four leds: LED1, LED2, LED3 and LED4 connected to GPIO18 - 21<br><br>
+	To turn a led on/off check/uncheck its corresponding checkbox.<br>
+	Then click on the "Send" button to submit the changes.<br>
+	</span>
+	<br>
+	<form method="get" action="/leds_ext.cgi">
+		<input value="1" name="led" type="checkbox" <!--#state1-->>
+			<span style=<!--#bg1-->>LED1</span><br>
+		<input value="2" name="led" type="checkbox" <!--#state2-->>
+			<span style=<!--#bg2-->>LED2</span><br>
+		<input value="3" name="led" type="checkbox" <!--#state3-->>
+			<span style=<!--#bg3-->>LED3</span><br>
+		<input value="4" name="led" type="checkbox" <!--#state4-->>
+			<span style=<!--#bg4-->>LED4</span><br>
+		<input value="Send" type="submit">
+	</form>
+	<br>
+	<br>
+    <a href="/index.html">Back</a>
+	</body>
+</html>
+

src/lwipopts.h

@@ -57,6 +57,7 @@
 
 #define LWIP_HTTPD 1
 #define LWIP_HTTPD_SSI 1
+#define LWIP_HTTPD_CGI 1
 // don't include the tag comment - less work for the CPU, but may be harder to debug
 #define LWIP_HTTPD_SSI_INCLUDE_TAG 0
 // use generated fsdata

src/main.cpp

@@ -6,11 +6,13 @@
 #include "pico/cyw43_arch.h"
 
 #include "lwipopts.h"
+#include "cgi.h"
 #include "ssi.h"
 
 void run_server() {
     httpd_init();
     ssi_init();
+    cgi_init();
     printf("Http server initialized.\n");
     // infinite loop for now
     for (;;) {}
@@ -23,9 +25,6 @@ int main() {
         printf("failed to initialise\n");
         return 1;
     }
-    // turn on LED to distinguish from BOOTSEL mode
-    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
-
     cyw43_arch_enable_sta_mode();
     // this seems to be the best be can do using the predefined `cyw43_pm_value` macro:
     // cyw43_wifi_pm(&cyw43_state, CYW43_PERFORMANCE_PM);
@@ -43,6 +42,9 @@ int main() {
         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);
     }
-
+    // turn on LED to signal connected
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
+
+
     run_server();
-}
+}