Merge pull request #158 from rzeldent:133-esp32-cam-led-flash-not-working

133-esp32-cam-led-flash-not-working

boards/esp32cam_ai_thinker.json

@@ -9,6 +9,7 @@
       "'-D ESP32CAM_AI_THINKER'",
       "'-D BOARD_HAS_PSRAM'",
       "'-mfix-esp32-psram-cache-issue'",
+      "'-D FLASH_LED_GPIO=4'",
       "'-D USER_LED_GPIO=33'",
       "'-D USER_LED_ON_LEVEL=LOW'",
       "'-D CAMERA_CONFIG_PIN_PWDN=32'",

src/main.cpp

@@ -150,6 +150,20 @@ void handle_root()
   web_server.send(200, "text/html", html);
 }
 
+#ifdef FLASH_LED_GPIO
+void handle_flash()
+{
+  log_v("handle_flash");
+  // If no value present, use off, otherwise convert v to integer. Depends on analog resolution for max value
+  auto v = web_server.hasArg("v") ? web_server.arg("v").toInt() : 0;
+  // If conversion fails, v = 0
+  analogWrite(FLASH_LED_GPIO, v);
+
+  web_server.sendHeader("Cache-Control", "no-cache, no-store, must-revalidate");
+  web_server.send(200);
+}
+#endif
+
 void handle_snapshot()
 {
   log_v("handle_snapshot");
@@ -316,13 +330,21 @@ void setup()
   // Disable brownout
   WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);
 
+  Serial.begin(115200);
+  Serial.setDebugOutput(true);
+
 #ifdef USER_LED_GPIO
   pinMode(USER_LED_GPIO, OUTPUT);
   digitalWrite(USER_LED_GPIO, !USER_LED_ON_LEVEL);
 #endif
 
-  Serial.begin(115200);
-  Serial.setDebugOutput(true);
+#ifdef FLASH_LED_GPIO
+  pinMode(FLASH_LED_GPIO, OUTPUT);
+  // Set resolution to 8 bits
+  analogWriteResolution(8);
+  // Turn flash led off
+  analogWrite(FLASH_LED_GPIO, 0);
+#endif
 
 #ifdef ARDUINO_USB_CDC_ON_BOOT
   // Delay for USB to connect/settle
@@ -397,7 +419,10 @@ void setup()
   web_server.on("/snapshot", HTTP_GET, handle_snapshot);
   // Camera stream
   web_server.on("/stream", HTTP_GET, handle_stream);
-
+#ifdef FLASH_LED_GPIO
+  // Flash led
+  web_server.on("/flash", HTTP_GET, handle_flash);
+#endif
   web_server.onNotFound([]()
                         { iotWebConf.handleNotFound(); });
 }